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• Why is the class wrong for NSFetchRequest?

  - by Stephen Furlani

  Hello, I am working with an undocumented API (Osirix) and I have a sister-question to the one I posted here. I am having trouble loading objects from a managed object context. With loading from API, using their instance of _context and _model 2010-05-28 14:05:13.588 OsiriX[44012:a0f] Entity: Study 2010-05-28 14:05:13.589 OsiriX[44012:a0f] EntityClassName: DicomStudy 2010-05-28 14:05:13.589 OsiriX[44012:a0f] ClassName: DicomStudy With loading from Fetch Request (and my own instance of _context, and _model) 2010-05-28 14:19:09.956 rcOsirix[44431:7a03] Entity: Study 2010-05-28 14:19:09.957 rcOsirix[44431:7a03] EntityClassName: DicomStudy 2010-05-28 14:19:09.958 rcOsirix[44431:7a03] ClassName: NSManagedObject output given by: NSLog(@"Entity: %@",[[item entity] name]); NSLog(@"EntityClassName: %@", [[item entity] managedObjectClassName]); NSLog(@"ClassName: %s", class_getName(object_getClass([item class]))); So it is obvious that even though the Entity thinks it is a DicomSeries - it is not. It is just a NSManagedObject. DicomSeries has some "hard-coded" KVC stuff that I ran into a problem with in my other question. I'm pursuing a different line of reasoning in this thread - with the loading of the objects. The following is their code: - (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel) return managedObjectModel; NSMutableSet *allBundles = [[NSMutableSet alloc] init]; [allBundles addObject: [NSBundle mainBundle]]; [allBundles addObjectsFromArray: [NSBundle allFrameworks]]; managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL: [NSURL fileURLWithPath: [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"/OsiriXDB_DataModel.mom"]]]; [allBundles release]; return managedObjectModel; } - (NSManagedObjectContext *) managedObjectContextLoadIfNecessary:(BOOL) loadIfNecessary { NSError *error = nil; NSString *localizedDescription; NSFileManager *fileManager; if( currentDatabasePath == nil) return nil; if (managedObjectContext) return managedObjectContext; if( loadIfNecessary == NO) return nil; fileManager = [NSFileManager defaultManager]; [persistentStoreCoordinator release]; persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: self.managedObjectModel]; managedObjectContext = [[NSManagedObjectContext alloc] init]; [managedObjectContext setPersistentStoreCoordinator: persistentStoreCoordinator]; NSURL *url = [NSURL fileURLWithPath: currentDatabasePath]; if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:url options:nil error:&error]) { NSLog(@"********** managedObjectContextLoadIfNecessary FAILED: %@", error); localizedDescription = [error localizedDescription]; error = [NSError errorWithDomain:@"OsiriXDomain" code:0 userInfo:[NSDictionary dictionaryWithObjectsAndKeys:error, NSUnderlyingErrorKey, [NSString stringWithFormat:@"Store Configuration Failure: %@", ((localizedDescription != nil) ? localizedDescription : @"Unknown Error")], NSLocalizedDescriptionKey, nil]]; } [[managedObjectContext undoManager] setLevelsOfUndo: 1]; [[managedObjectContext undoManager] disableUndoRegistration]; // This line is very important, if there is NO database.sql file [self saveDatabase: currentDatabasePath]; return managedObjectContext; } This is my code: NSManagedObjectModel* DataModule::managedObjectModel() { if (_managedObjectModel) return _managedObjectModel; NSMutableSet *allBundles = [[NSMutableSet alloc] init]; [allBundles addObject: [NSBundle mainBundle]]; [allBundles addObjectsFromArray: [NSBundle allFrameworks]]; _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL: [NSURL fileURLWithPath: [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"/OsiriXDB_DataModel.mom"]]]; [allBundles release]; return [_managedObjectModel retain]; } ... NSError *error = nil; [_storeCoordinator release]; _storeCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: managedObjectModel()]; _context = [[NSManagedObjectContext alloc] init]; [_context setPersistentStoreCoordinator: _storeCoordinator]; NSURL *url = [NSURL fileURLWithPath: [[NSString alloc] initWithCString:_DBPath.c_str()]]; if (url == nil) { [pool release]; _loadLock = false; return nil; } if (![_storeCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:url options:nil error:&error]) { NSLog(@"********** managedObjectContextLoadIfNecessary FAILED: %@", error); NSString *localizedDescription = [error localizedDescription]; error = [NSError errorWithDomain:@"OsiriXDomain" code:0 userInfo:[NSDictionary dictionaryWithObjectsAndKeys:error, NSUnderlyingErrorKey, [NSString stringWithFormat:@"Store Configuration Failure: %@", ((localizedDescription != nil) ? localizedDescription : @"Unknown Error")], NSLocalizedDescriptionKey, nil]]; //Exit Failure [pool release]; _loadLock = false; return nil; } [[_context undoManager] setLevelsOfUndo: 1]; [[_context undoManager] disableUndoRegistration]; ... I am including all the same frameworks.... but _allBundles isn't even used to create the managedObjectModel so I don't know what it's supposed to do except load them into memory so that the mom can look at them while loading. Totally lost. Help! Why would objects returned by my FetchRequest with the same Entity come out as NSManagedObjects and not DicomStudys? I'm including DicomStudy.h so it should see the object during creation of the model, context, and fetch request. [request setEntity: [[managedObjectModel() entitiesByName] objectForKey:@"Study"]]; Thanks in advance, -Stephen

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• ATI propriatery drivers install latest 12.8, broke my kernel. Stuck on kernel 3.2.0-26

  - by user66987

  I messed up a bit. Hoping some here can help me. I tried to install the newest catalyst 12.8. Sadly, this broke my system. I was stuck in low graphics mode. I finally managed to restore the proprietary drivers, and get into ubuntu again. But now I am stuck on kernel 3.2.0.26. I had installed kernel 3.2.0-30, but the system no longer sees it. I have kernel 3.2.0-29 too, but the system cannot see that as well. In the grub menu. When I use sudo update-grub, they are both listed. Here are the output I get: Searching for GRUB installation directory ... found: /boot/grub Cannot determine root device. Assuming /dev/hda1 This error is probably caused by an invalid /etc/fstab Searching for default file ... found: /boot/grub/default Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst Searching for splash image ... none found, skipping ... Found kernel: /boot/vmlinuz-3.2.0-30-generic Found kernel: /boot/vmlinuz-3.2.0-29-generic Found kernel: /boot/vmlinuz-3.2.0-27-generic Found kernel: /boot/vmlinuz-3.2.0-26-generic Found GRUB 2: /boot/grub/core.img Found kernel: /boot/memtest86+.bin Updating /boot/grub/menu.lst ... done I have searched everywhere to find a solution to my problem, but can't find any solutions. If you need any log outputs to figure out the problem, please let me know which ones. Update: here is the output for grub.cfg # # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then set have_grubenv=true load_env fi set default="0" if [ "${prev_saved_entry}" ]; then set saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z "${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi } function recordfail { set recordfail=1 if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi } function load_video { insmod vbe insmod vga insmod video_bochs insmod video_cirrus } insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=auto load_video insmod gfxterm insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b set locale_dir=($root)/boot/grub/locale set lang=nb_NO insmod gettext fi terminal_output gfxterm if [ "${recordfail}" = 1 ]; then set timeout=-1 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/light-gray if background_color 44,0,30; then clear fi ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### function gfxmode { set gfxpayload="${1}" if [ "${1}" = "keep" ]; then set vt_handoff=vt.handoff=7 else set vt_handoff= fi } if [ "${recordfail}" != 1 ]; then if [ -e ${prefix}/gfxblacklist.txt ]; then if hwmatch ${prefix}/gfxblacklist.txt 3; then if [ ${match} = 0 ]; then set linux_gfx_mode=keep else set linux_gfx_mode=text fi else set linux_gfx_mode=text fi else set linux_gfx_mode=keep fi else set linux_gfx_mode=text fi export linux_gfx_mode if [ "${linux_gfx_mode}" != "text" ]; then load_video; fi menuentry 'Ubuntu, med Linux 3.2.0-26-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail gfxmode $linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b linux /boot/vmlinuz-3.2.0-26-generic root=UUID=270c7c58-06d8-4e6b-b9bb-8d92f46adc0b ro quiet splash $vt_handoff initrd /boot/initrd.img-3.2.0-26-generic } menuentry 'Ubuntu, med Linux 3.2.0-26-generic (gjenopprettelsesmodus)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod gzio insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b echo 'Laster Linux 3.2.0-26-generic ...' linux /boot/vmlinuz-3.2.0-26-generic root=UUID=270c7c58-06d8-4e6b-b9bb-8d92f46adc0b ro recovery nomodeset echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-3.2.0-26-generic } submenu "Previous Linux versions" { menuentry 'Ubuntu, med Linux 3.2.0-25-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail gfxmode $linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b linux /boot/vmlinuz-3.2.0-25-generic root=UUID=270c7c58-06d8-4e6b-b9bb-8d92f46adc0b ro quiet splash $vt_handoff initrd /boot/initrd.img-3.2.0-25-generic } menuentry 'Ubuntu, med Linux 3.2.0-25-generic (gjenopprettelsesmodus)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod gzio insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b echo 'Laster Linux 3.2.0-25-generic ...' linux /boot/vmlinuz-3.2.0-25-generic root=UUID=270c7c58-06d8-4e6b-b9bb-8d92f46adc0b ro recovery nomodeset echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-3.2.0-25-generic } menuentry 'Ubuntu, med Linux 3.2.0-24-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail gfxmode $linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b linux /boot/vmlinuz-3.2.0-24-generic root=UUID=270c7c58-06d8-4e6b-b9bb-8d92f46adc0b ro quiet splash $vt_handoff initrd /boot/initrd.img-3.2.0-24-generic } menuentry 'Ubuntu, med Linux 3.2.0-24-generic (gjenopprettelsesmodus)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod gzio insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b echo 'Laster Linux 3.2.0-24-generic ...' linux /boot/vmlinuz-3.2.0-24-generic root=UUID=270c7c58-06d8-4e6b-b9bb-8d92f46adc0b ro recovery nomodeset echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-3.2.0-24-generic } menuentry 'Ubuntu, med Linux 3.2.0-23-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail gfxmode $linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b linux /boot/vmlinuz-3.2.0-23-generic root=UUID=270c7c58-06d8-4e6b-b9bb-8d92f46adc0b ro quiet splash $vt_handoff initrd /boot/initrd.img-3.2.0-23-generic } menuentry 'Ubuntu, med Linux 3.2.0-23-generic (gjenopprettelsesmodus)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod gzio insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b echo 'Laster Linux 3.2.0-23-generic ...' linux /boot/vmlinuz-3.2.0-23-generic root=UUID=270c7c58-06d8-4e6b-b9bb-8d92f46adc0b ro recovery nomodeset echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-3.2.0-23-generic } } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END /etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod part_msdos insmod ext2 set root='(hd2,msdos1)' search --no-floppy --fs-uuid --set=root 270c7c58-06d8-4e6b-b9bb-8d92f46adc0b linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober ### menuentry "Windows 7 (loader) (on /dev/sdb1)" --class windows --class os { insmod part_msdos insmod ntfs set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set=root 448AF3CE8AF3BA8E chainloader +1 } ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ### How can I set kernel 3.2.0.30 as the default kernel? According to this file, kernel 3.2.0-30 does not exist.

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• IPsec tunnel to Android device not created even though there is an IKE SA

  - by Quentin Swain

  I'm trying to configure a VPN tunnel between an Android device running 4.1 and a Fedora 17 Linux box running strongSwan 5.0. The device reports that it is connected and strongSwan statusall returns that there is an IKE SA, but doesn't display a tunnel. I used the instructions for iOS in the wiki to generate certificates and configure strongSwan. Since Android uses a modified version of racoon this should work and since the connection is partly established I think I am on the right track. I don't see any errors about not being able to create the tunnel. This is the configuration for the strongSwan connection conn android2 keyexchange=ikev1 authby=xauthrsasig xauth=server left=96.244.142.28 leftsubnet=0.0.0.0/0 leftfirewall=yes leftcert=serverCert.pem right=%any rightsubnet=10.0.0.0/24 rightsourceip=10.0.0.2 rightcert=clientCert.pem ike=aes256-sha1-modp1024 auto=add This is the output of strongswan statusall Status of IKE charon daemon (strongSwan 5.0.0, Linux 3.3.4-5.fc17.x86_64, x86_64): uptime: 20 minutes, since Oct 31 10:27:31 2012 malloc: sbrk 270336, mmap 0, used 198144, free 72192 worker threads: 8 of 16 idle, 7/1/0/0 working, job queue: 0/0/0/0, scheduled: 7 loaded plugins: charon aes des sha1 sha2 md5 random nonce x509 revocation constraints pubkey pkcs1 pkcs8 pgp dnskey pem openssl fips-prf gmp xcbc cmac hmac attr kernel-netlink resolve socket-default stroke updown xauth-generic Virtual IP pools (size/online/offline): android-hybrid: 1/0/0 android2: 1/1/0 Listening IP addresses: 96.244.142.28 Connections: android-hybrid: %any...%any IKEv1 android-hybrid: local: [C=CH, O=strongSwan, CN=vpn.strongswan.org] uses public key authentication android-hybrid: cert: "C=CH, O=strongSwan, CN=vpn.strongswan.org" android-hybrid: remote: [%any] uses XAuth authentication: any android-hybrid: child: dynamic === dynamic TUNNEL android2: 96.244.142.28...%any IKEv1 android2: local: [C=CH, O=strongSwan, CN=vpn.strongswan.org] uses public key authentication android2: cert: "C=CH, O=strongSwan, CN=vpn.strongswan.org" android2: remote: [C=CH, O=strongSwan, CN=client] uses public key authentication android2: cert: "C=CH, O=strongSwan, CN=client" android2: remote: [%any] uses XAuth authentication: any android2: child: 0.0.0.0/0 === 10.0.0.0/24 TUNNEL Security Associations (1 up, 0 connecting): android2[3]: ESTABLISHED 10 seconds ago, 96.244.142.28[C=CH, O=strongSwan, CN=vpn.strongswan.org]...208.54.35.241[C=CH, O=strongSwan, CN=client] android2[3]: Remote XAuth identity: android android2[3]: IKEv1 SPIs: 4151e371ad46b20d_i 59a56390d74792d2_r*, public key reauthentication in 56 minutes android2[3]: IKE proposal: AES_CBC_256/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024 The output of ip -s xfrm policy src ::/0 dst ::/0 uid 0 socket in action allow index 3851 priority 0 ptype main share any flag (0x00000000) lifetime config: limit: soft 0(bytes), hard 0(bytes) limit: soft 0(packets), hard 0(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:29:08 use - src ::/0 dst ::/0 uid 0 socket out action allow index 3844 priority 0 ptype main share any flag (0x00000000) lifetime config: limit: soft 0(bytes), hard 0(bytes) limit: soft 0(packets), hard 0(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:29:08 use - src ::/0 dst ::/0 uid 0 socket in action allow index 3835 priority 0 ptype main share any flag (0x00000000) lifetime config: limit: soft 0(bytes), hard 0(bytes) limit: soft 0(packets), hard 0(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:29:08 use - src ::/0 dst ::/0 uid 0 socket out action allow index 3828 priority 0 ptype main share any flag (0x00000000) lifetime config: limit: soft 0(bytes), hard 0(bytes) limit: soft 0(packets), hard 0(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:29:08 use - src 0.0.0.0/0 dst 0.0.0.0/0 uid 0 socket in action allow index 3819 priority 0 ptype main share any flag (0x00000000) lifetime config: limit: soft 0(bytes), hard 0(bytes) limit: soft 0(packets), hard 0(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:29:08 use 2012-10-31 13:29:39 src 0.0.0.0/0 dst 0.0.0.0/0 uid 0 socket out action allow index 3812 priority 0 ptype main share any flag (0x00000000) lifetime config: limit: soft 0(bytes), hard 0(bytes) limit: soft 0(packets), hard 0(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:29:08 use 2012-10-31 13:29:22 src 0.0.0.0/0 dst 0.0.0.0/0 uid 0 socket in action allow index 3803 priority 0 ptype main share any flag (0x00000000) lifetime config: limit: soft 0(bytes), hard 0(bytes) limit: soft 0(packets), hard 0(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:29:08 use 2012-10-31 13:29:20 src 0.0.0.0/0 dst 0.0.0.0/0 uid 0 socket out action allow index 3796 priority 0 ptype main share any flag (0x00000000) lifetime config: limit: soft 0(bytes), hard 0(bytes) limit: soft 0(packets), hard 0(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:29:08 use 2012-10-31 13:29:20 So a xfrm policy isn't being created for the connection, even though there is an SA between device and strongswan. Executing ip -s xfrm policy on the android device results in the following output: src 0.0.0.0/0 dst 10.0.0.2/32 uid 0 dir in action allow index 40 priority 2147483648 share any flag (0x00000000) lifetime config: limit: soft (INF)(bytes), hard (INF)(bytes) limit: soft (INF)(packets), hard (INF)(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:42:08 use - tmpl src 96.244.142.28 dst 25.239.33.30 proto esp spi 0x00000000(0) reqid 0(0x00000000) mode tunnel level required share any enc-mask 00000000 auth-mask 00000000 comp-mask 00000000 src 10.0.0.2/32 dst 0.0.0.0/0 uid 0 dir out action allow index 33 priority 2147483648 share any flag (0x00000000) lifetime config: limit: soft (INF)(bytes), hard (INF)(bytes) limit: soft (INF)(packets), hard (INF)(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:42:08 use - tmpl src 25.239.33.30 dst 96.244.142.28 proto esp spi 0x00000000(0) reqid 0(0x00000000) mode tunnel level required share any enc-mask 00000000 auth-mask 00000000 comp-mask 00000000 src 0.0.0.0/0 dst 0.0.0.0/0 uid 0 dir 4 action allow index 28 priority 0 share any flag (0x00000000) lifetime config: limit: soft (INF)(bytes), hard (INF)(bytes) limit: soft (INF)(packets), hard (INF)(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:42:04 use 2012-10-31 13:42:08 src 0.0.0.0/0 dst 0.0.0.0/0 uid 0 dir 3 action allow index 19 priority 0 share any flag (0x00000000) lifetime config: limit: soft (INF)(bytes), hard (INF)(bytes) limit: soft (INF)(packets), hard (INF)(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:42:04 use 2012-10-31 13:42:08 src 0.0.0.0/0 dst 0.0.0.0/0 uid 0 dir 4 action allow index 12 priority 0 share any flag (0x00000000) lifetime config: limit: soft (INF)(bytes), hard (INF)(bytes) limit: soft (INF)(packets), hard (INF)(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:42:04 use 2012-10-31 13:42:06 src 0.0.0.0/0 dst 0.0.0.0/0 uid 0 dir 3 action allow index 3 priority 0 share any flag (0x00000000) lifetime config: limit: soft (INF)(bytes), hard (INF)(bytes) limit: soft (INF)(packets), hard (INF)(packets) expire add: soft 0(sec), hard 0(sec) expire use: soft 0(sec), hard 0(sec) lifetime current: 0(bytes), 0(packets) add 2012-10-31 13:42:04 use 2012-10-31 13:42:07 Logs from charon: 00[DMN] Starting IKE charon daemon (strongSwan 5.0.0, Linux 3.3.4-5.fc17.x86_64, x86_64) 00[KNL] listening on interfaces: 00[KNL] em1 00[KNL] 96.244.142.28 00[KNL] fe80::224:e8ff:fed2:18b2 00[CFG] loading ca certificates from '/etc/strongswan/ipsec.d/cacerts' 00[CFG] loaded ca certificate "C=CH, O=strongSwan, CN=strongSwan CA" from '/etc/strongswan/ipsec.d/cacerts/caCert.pem' 00[CFG] loading aa certificates from '/etc/strongswan/ipsec.d/aacerts' 00[CFG] loading ocsp signer certificates from '/etc/strongswan/ipsec.d/ocspcerts' 00[CFG] loading attribute certificates from '/etc/strongswan/ipsec.d/acerts' 00[CFG] loading crls from '/etc/strongswan/ipsec.d/crls' 00[CFG] loading secrets from '/etc/strongswan/ipsec.secrets' 00[CFG] loaded RSA private key from '/etc/strongswan/ipsec.d/private/clientKey.pem' 00[CFG] loaded IKE secret for %any 00[CFG] loaded EAP secret for android 00[CFG] loaded EAP secret for android 00[DMN] loaded plugins: charon aes des sha1 sha2 md5 random nonce x509 revocation constraints pubkey pkcs1 pkcs8 pgp dnskey pem openssl fips-prf gmp xcbc cmac hmac attr kernel-netlink resolve socket-default stroke updown xauth-generic 08[NET] waiting for data on sockets 16[LIB] created thread 16 [15338] 16[JOB] started worker thread 16 11[CFG] received stroke: add connection 'android-hybrid' 11[CFG] conn android-hybrid 11[CFG] left=%any 11[CFG] leftsubnet=(null) 11[CFG] leftsourceip=(null) 11[CFG] leftauth=pubkey 11[CFG] leftauth2=(null) 11[CFG] leftid=(null) 11[CFG] leftid2=(null) 11[CFG] leftrsakey=(null) 11[CFG] leftcert=serverCert.pem 11[CFG] leftcert2=(null) 11[CFG] leftca=(null) 11[CFG] leftca2=(null) 11[CFG] leftgroups=(null) 11[CFG] leftupdown=ipsec _updown iptables 11[CFG] right=%any 11[CFG] rightsubnet=(null) 11[CFG] rightsourceip=96.244.142.3 11[CFG] rightauth=xauth 11[CFG] rightauth2=(null) 11[CFG] rightid=%any 11[CFG] rightid2=(null) 11[CFG] rightrsakey=(null) 11[CFG] rightcert=(null) 11[CFG] rightcert2=(null) 11[CFG] rightca=(null) 11[CFG] rightca2=(null) 11[CFG] rightgroups=(null) 11[CFG] rightupdown=(null) 11[CFG] eap_identity=(null) 11[CFG] aaa_identity=(null) 11[CFG] xauth_identity=(null) 11[CFG] ike=aes256-sha1-modp1024 11[CFG] esp=aes128-sha1-modp2048,3des-sha1-modp1536 11[CFG] dpddelay=30 11[CFG] dpdtimeout=150 11[CFG] dpdaction=0 11[CFG] closeaction=0 11[CFG] mediation=no 11[CFG] mediated_by=(null) 11[CFG] me_peerid=(null) 11[CFG] keyexchange=ikev1 11[KNL] getting interface name for %any 11[KNL] %any is not a local address 11[KNL] getting interface name for %any 11[KNL] %any is not a local address 11[CFG] left nor right host is our side, assuming left=local 11[CFG] loaded certificate "C=CH, O=strongSwan, CN=vpn.strongswan.org" from 'serverCert.pem' 11[CFG] id '%any' not confirmed by certificate, defaulting to 'C=CH, O=strongSwan, CN=vpn.strongswan.org' 11[CFG] added configuration 'android-hybrid' 11[CFG] adding virtual IP address pool 'android-hybrid': 96.244.142.3/32 13[CFG] received stroke: add connection 'android2' 13[CFG] conn android2 13[CFG] left=96.244.142.28 13[CFG] leftsubnet=0.0.0.0/0 13[CFG] leftsourceip=(null) 13[CFG] leftauth=pubkey 13[CFG] leftauth2=(null) 13[CFG] leftid=(null) 13[CFG] leftid2=(null) 13[CFG] leftrsakey=(null) 13[CFG] leftcert=serverCert.pem 13[CFG] leftcert2=(null) 13[CFG] leftca=(null) 13[CFG] leftca2=(null) 13[CFG] leftgroups=(null) 13[CFG] leftupdown=ipsec _updown iptables 13[CFG] right=%any 13[CFG] rightsubnet=10.0.0.0/24 13[CFG] rightsourceip=10.0.0.2 13[CFG] rightauth=pubkey 13[CFG] rightauth2=xauth 13[CFG] rightid=(null) 13[CFG] rightid2=(null) 13[CFG] rightrsakey=(null) 13[CFG] rightcert=clientCert.pem 13[CFG] rightcert2=(null) 13[CFG] rightca=(null) 13[CFG] rightca2=(null) 13[CFG] rightgroups=(null) 13[CFG] rightupdown=(null) 13[CFG] eap_identity=(null) 13[CFG] aaa_identity=(null) 13[CFG] xauth_identity=(null) 13[CFG] ike=aes256-sha1-modp1024 13[CFG] esp=aes128-sha1-modp2048,3des-sha1-modp1536 13[CFG] dpddelay=30 13[CFG] dpdtimeout=150 13[CFG] dpdaction=0 13[CFG] closeaction=0 13[CFG] mediation=no 13[CFG] mediated_by=(null) 13[CFG] me_peerid=(null) 13[CFG] keyexchange=ikev0 13[KNL] getting interface name for %any 13[KNL] %any is not a local address 13[KNL] getting interface name for 96.244.142.28 13[KNL] 96.244.142.28 is on interface em1 13[CFG] loaded certificate "C=CH, O=strongSwan, CN=vpn.strongswan.org" from 'serverCert.pem' 13[CFG] id '96.244.142.28' not confirmed by certificate, defaulting to 'C=CH, O=strongSwan, CN=vpn.strongswan.org' 13[CFG] loaded certificate "C=CH, O=strongSwan, CN=client" from 'clientCert.pem' 13[CFG] id '%any' not confirmed by certificate, defaulting to 'C=CH, O=strongSwan, CN=client' 13[CFG] added configuration 'android2' 13[CFG] adding virtual IP address pool 'android2': 10.0.0.2/32 08[NET] received packet: from 208.54.35.241[32235] to 96.244.142.28[500] 15[CFG] looking for an ike config for 96.244.142.28...208.54.35.241 15[CFG] candidate: %any...%any, prio 2 15[CFG] candidate: 96.244.142.28...%any, prio 5 15[CFG] found matching ike config: 96.244.142.28...%any with prio 5 01[JOB] next event in 29s 999ms, waiting 15[IKE] received NAT-T (RFC 3947) vendor ID 15[IKE] received draft-ietf-ipsec-nat-t-ike-02 vendor ID 15[IKE] received draft-ietf-ipsec-nat-t-ike-02\n vendor ID 15[IKE] received draft-ietf-ipsec-nat-t-ike-00 vendor ID 15[IKE] received XAuth vendor ID 15[IKE] received Cisco Unity vendor ID 15[IKE] received DPD vendor ID 15[IKE] 208.54.35.241 is initiating a Main Mode IKE_SA 15[IKE] IKE_SA (unnamed)[1] state change: CREATED => CONNECTING 15[CFG] selecting proposal: 15[CFG] proposal matches 15[CFG] received proposals: IKE:AES_CBC_256/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024, IKE:AES_CBC_256/HMAC_MD5_96/PRF_HMAC_MD5/MODP_1024, IKE:AES_CBC_128/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024, IKE:AES_CBC_128/HMAC_MD5_96/PRF_HMAC_MD5/MODP_1024, IKE:3DES_CBC/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024, IKE:3DES_CBC/HMAC_MD5_96/PRF_HMAC_MD5/MODP_1024, IKE:DES_CBC/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024, IKE:DES_CBC/HMAC_MD5_96/PRF_HMAC_MD5/MODP_1024 15[CFG] configured proposals: IKE:AES_CBC_256/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024, IKE:AES_CBC_128/AES_CBC_192/AES_CBC_256/3DES_CBC/CAMELLIA_CBC_128/CAMELLIA_CBC_192/CAMELLIA_CBC_256/HMAC_MD5_96/HMAC_SHA1_96/HMAC_SHA2_256_128/HMAC_SHA2_384_192/HMAC_SHA2_512_256/AES_XCBC_96/AES_CMAC_96/PRF_HMAC_MD5/PRF_HMAC_SHA1/PRF_HMAC_SHA2_256/PRF_HMAC_SHA2_384/PRF_HMAC_SHA2_512/PRF_AES128_XCBC/PRF_AES128_CMAC/MODP_2048/MODP_2048_224/MODP_2048_256/MODP_1536/MODP_4096/MODP_8192/MODP_1024/MODP_1024_160 15[CFG] selected proposal: IKE:AES_CBC_256/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024 15[NET] sending packet: from 96.244.142.28[500] to 208.54.35.241[32235] 04[NET] sending packet: from 96.244.142.28[500] to 208.54.35.241[32235] 15[MGR] checkin IKE_SA (unnamed)[1] 15[MGR] check-in of IKE_SA successful. 08[NET] received packet: from 208.54.35.241[32235] to 96.244.142.28[500] 08[NET] waiting for data on sockets 07[MGR] checkout IKE_SA by message 07[MGR] IKE_SA (unnamed)[1] successfully checked out 07[NET] received packet: from 208.54.35.241[32235] to 96.244.142.28[500] 07[LIB] size of DH secret exponent: 1023 bits 07[IKE] remote host is behind NAT 07[IKE] sending cert request for "C=CH, O=strongSwan, CN=strongSwan CA" 07[ENC] generating NAT_D_V1 payload finished 07[NET] sending packet: from 96.244.142.28[500] to 208.54.35.241[32235] 07[MGR] checkin IKE_SA (unnamed)[1] 07[MGR] check-in of IKE_SA successful. 04[NET] sending packet: from 96.244.142.28[500] to 208.54.35.241[32235] 08[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] 10[IKE] ignoring certificate request without data 10[IKE] received end entity cert "C=CH, O=strongSwan, CN=client" 10[CFG] looking for XAuthInitRSA peer configs matching 96.244.142.28...208.54.35.241[C=CH, O=strongSwan, CN=client] 10[CFG] candidate "android-hybrid", match: 1/1/2/2 (me/other/ike/version) 10[CFG] candidate "android2", match: 1/20/5/1 (me/other/ike/version) 10[CFG] selected peer config "android2" 10[CFG] certificate "C=CH, O=strongSwan, CN=client" key: 2048 bit RSA 10[CFG] using trusted ca certificate "C=CH, O=strongSwan, CN=strongSwan CA" 10[CFG] checking certificate status of "C=CH, O=strongSwan, CN=client" 10[CFG] ocsp check skipped, no ocsp found 10[CFG] certificate status is not available 10[CFG] certificate "C=CH, O=strongSwan, CN=strongSwan CA" key: 2048 bit RSA 10[CFG] reached self-signed root ca with a path length of 0 10[CFG] using trusted certificate "C=CH, O=strongSwan, CN=client" 10[IKE] authentication of 'C=CH, O=strongSwan, CN=client' with RSA successful 10[ENC] added payload of type ID_V1 to message 10[ENC] added payload of type SIGNATURE_V1 to message 10[IKE] authentication of 'C=CH, O=strongSwan, CN=vpn.strongswan.org' (myself) successful 10[IKE] queueing XAUTH task 10[IKE] sending end entity cert "C=CH, O=strongSwan, CN=vpn.strongswan.org" 10[NET] sending packet: from 96.244.142.28[4500] to 208.54.35.241[35595] 04[NET] sending packet: from 96.244.142.28[4500] to 208.54.35.241[35595] 10[IKE] activating new tasks 10[IKE] activating XAUTH task 10[NET] sending packet: from 96.244.142.28[4500] to 208.54.35.241[35595] 04[NET] sending packet: from 96.244.142.28[4500] to 208.54.35.241[35595] 01[JOB] next event in 3s 999ms, waiting 10[MGR] checkin IKE_SA android2[1] 10[MGR] check-in of IKE_SA successful. 08[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] 08[NET] waiting for data on sockets 12[MGR] checkout IKE_SA by message 12[MGR] IKE_SA android2[1] successfully checked out 12[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] 12[MGR] checkin IKE_SA android2[1] 12[MGR] check-in of IKE_SA successful. 08[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] 16[MGR] checkout IKE_SA by message 16[MGR] IKE_SA android2[1] successfully checked out 16[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] 08[NET] waiting for data on sockets 16[IKE] XAuth authentication of 'android' successful 16[IKE] reinitiating already active tasks 16[IKE] XAUTH task 16[NET] sending packet: from 96.244.142.28[4500] to 208.54.35.241[35595] 04[NET] sending packet: from 96.244.142.28[4500] to 208.54.35.241[35595] 16[MGR] checkin IKE_SA android2[1] 01[JOB] next event in 3s 907ms, waiting 16[MGR] check-in of IKE_SA successful. 08[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] 09[MGR] checkout IKE_SA by message 09[MGR] IKE_SA android2[1] successfully checked out 09[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] .8rS 09[IKE] IKE_SA android2[1] established between 96.244.142.28[C=CH, O=strongSwan, CN=vpn.strongswan.org]...208.54.35.241[C=CH, O=strongSwan, CN=client] 09[IKE] IKE_SA android2[1] state change: CONNECTING => ESTABLISHED 09[IKE] scheduling reauthentication in 3409s 09[IKE] maximum IKE_SA lifetime 3589s 09[IKE] activating new tasks 09[IKE] nothing to initiate 09[MGR] checkin IKE_SA android2[1] 09[MGR] check-in of IKE_SA successful. 09[MGR] checkout IKE_SA 09[MGR] IKE_SA android2[1] successfully checked out 09[MGR] checkin IKE_SA android2[1] 09[MGR] check-in of IKE_SA successful. 01[JOB] next event in 3s 854ms, waiting 08[NET] waiting for data on sockets 08[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] 14[MGR] checkout IKE_SA by message 14[MGR] IKE_SA android2[1] successfully checked out 14[NET] received packet: from 208.54.35.241[35595] to 96.244.142.28[4500] 14[IKE] processing INTERNAL_IP4_ADDRESS attribute 14[IKE] processing INTERNAL_IP4_NETMASK attribute 14[IKE] processing INTERNAL_IP4_DNS attribute 14[IKE] processing INTERNAL_IP4_NBNS attribute 14[IKE] processing UNITY_BANNER attribute 14[IKE] processing UNITY_DEF_DOMAIN attribute 14[IKE] processing UNITY_SPLITDNS_NAME attribute 14[IKE] processing UNITY_SPLIT_INCLUDE attribute 14[IKE] processing UNITY_LOCAL_LAN attribute 14[IKE] processing APPLICATION_VERSION attribute 14[IKE] peer requested virtual IP %any 14[CFG] assigning new lease to 'android' 14[IKE] assigning virtual IP 10.0.0.2 to peer 'android' 14[NET] sending packet: from 96.244.142.28[4500] to 208.54.35.241[35595] 14[MGR] checkin IKE_SA android2[1] 14[MGR] check-in of IKE_SA successful. 04[NET] sending packet: from 96.244.142.28[4500] to 208.54.35.241[35595] 08[NET] waiting for data on sockets 01[JOB] got event, queuing job for execution 01[JOB] next event in 91ms, waiting 13[MGR] checkout IKE_SA 13[MGR] IKE_SA android2[1] successfully checked out 13[MGR] checkin IKE_SA android2[1] 13[MGR] check-in of IKE_SA successful. 01[JOB] got event, queuing job for execution 01[JOB] next event in 24s 136ms, waiting 15[MGR] checkout IKE_SA 15[MGR] IKE_SA android2[1] successfully checked out 15[MGR] checkin IKE_SA android2[1] 15[MGR] check-in of IKE_SA successful.

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• Introducing Java/Open Source Daily, All the Java/Open Source Information You Need in One Newsletter

  Internet.com launches a new daily newsletter to provide one-stop coverage of all the Java and Open Source information that matters to you.

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• Introducing Java/Open Source Daily, All the Java/Open Source Information You Need in One Newsletter

  Internet.com launches a new daily newsletter to provide one-stop coverage of all the Java and Open Source information that matters to you.

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• The .NET Rocks! Visual Studio 2010 Road Trip

  - by Laila

  Carl Franklin and Richard Campbell, the two .NET Rocks radio show hosts, have decided to set off to 15 cities in the US, between April 19th and May 7th, in their DotNetMobile (a 30 foot RV). What for you'll ask me? Well, to drive around the US, meet up with .NET developers, and show off the latest and greatest in Visual Studio 2010 and .NET 4.0! Each evening, they stop in a city and host a three hour event in front of a 100 to 300 crowd of developers, where Carl is showing off media features in Silverlight 4 and their road trip tracking application, whilst Richard is demo-ing the web performance testing features of VS2010 using his portable server rig. But before they take to the stage, they have a special guest brought in - a rock star from the Visual Studio world - whom they interview for an hour as a .NET Rock episode. So far, they've had - amongst others - Phil Haack, a Program Manager with the ASP.NET team working on ASP.NET MVC, Dan Fernandez, an Evangelism Manager in the Developer and Platform Evangelism team at Microsoft, and Beth Massi, Senior Program Manager on the Visual Studio Community Team at Microsoft. I love the fact that the audience gets a chance to participate, ask questions and have a great laugh, as you can hear in the first episode! Along the way, the .NET Rocks guys are giving away great prizes (including .NET Reflector Pro, ANTS Memory Profiler licenses, and "40" LCD TVs!). Even more out of the ordinary, at each stop on the road trip, one lucky attendee (who entered in the Ride Along competition) gets to jump in the RV with Carl and Richard and ride along with them to the next stop on the roadtrip. How cool is that! Richard told us: "Our first winner in Mountain View was Eric Ziko. I was looking for him to announce that he had won, when he found us and gave us a bottle of scotch he had brought just to say 'thanks for the great show'. We all had a toast from the bottle the next night when he headed back home." Cheeky! There's still space to a few of these events, so if you want to attend, register now, because it's first come first serve. We're grateful to Richard and Carl for giving us the opportunity to sponsor this major .NET event! A unique .NET adventure worth following for sure. Cheers, Laila

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• No Wi-Fi after system reboot

  - by ILya

  Something strange is happening... I've installed a Wi-Fi card into my Ubuntu Server 11.04 machine. To configure it I do the following: sudo vi /etc/network/interfaces add: iface wlan0 inet dhcp wpa-driver wext wpa-ssid "Sweet Home" wpa-ap-scan 1 wpa-proto WPA wpa-pairwise TKIP wpa-group TKIP wpa-key-mgmt WPA-PSK wpa-psk <A KEY> auto wlan0 then: $ sudo /etc/init.d/networking restart * Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces * Reconfiguring network interfaces... ssh stop/waiting ssh start/running, process 1522 ssh stop/waiting ssh start/running, process 1590 And my machine successfully gets an ip to my wireless adapter. But after reboot it doesn't get any ip in wireless network. To fix it I run /etc/init.d/networking restart again and all is fine again - it gets an ip. I understand that I simply should add it to my startup scripts to make it work properly, but maybe there is a better way to configure it?

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• Dynamic Class Inheritance For PHP

  - by VirtuosiMedia

  I have a situation where I think I might need dynamic class inheritance in PHP 5.3, but the idea doesn't sit well and I'm looking for a different design pattern to solve my problem if it's possible. Use Case I have a set of DB abstraction layer classes that dynamically compiles SQL queries, with one DAL class for each DB type (MySQL, MsSQL, Oracle, etc.). Each table in the database has its own class that extends the appropriate DAL class. The idea is that you interact with the table classes, but never directly use the DAL class. If you want to support a different DB type for your app, you don't need to rewrite any queries or even any code, you simply change a setting that swaps one DAL class out for another...and that's it. To give you a better idea of how this is used, you can take a look at the DAL class, the table classes, and how they are used on this StackExchange Code Review page. To really understand what I'm trying to do, please take a look at my implementation first before suggesting a solution. Issues The strategy that I had used previously was to have all of the DAL classes share the same class name. This eliminated autoloading, so I had to manually load the appropriate DAL class in a switch statement. However, this approach presents some problems for testing and documentation purposes, so I'd like to find a different way to solve the problem of loading the correct DAL class more elegantly. Update to clarify the issue The problem basically boils down to inconsistencies in the class name (pre-PHP 5.3) or class namespace (PHP 5.3) and its location in the directory structure. At this point, all of my DAL classes have the same name, DBObject, but reside in different folders, MySQL, Oracle, etc. My table classes all extend DBObject, but which DBObject they extend varies depending on which one has been loaded. Basically, I'm trying to have my cake and eat it too. The table classes act as a stable API and extend a dynamic backend, the DAL (DBObject) classes. It works great, but I outsmarted myself and because of the inconsistencies with the class names and their locations, I can't autoload the DBObject, which makes running unit tests and generating API docs impossible for the DBObject classes because the tests and docs rely on auto-loading. Just loading the appropriate DBObject into memory using a factory method won't work because there will be times when I need to load multiple DBObjects for testing. Because the classes currently share a name, this causes a class is already defined error. I can make exceptions for the DBObjects in my test code, obviously, but I'm looking for something a little less hacky as there may future instances where something similar would need to be done. Solutions? Worst case scenario, I can continue my current strategy, but I don't like it very much, especially as I'll soon be converting my code to PHP 5.3. I suspect that I can use some sort of dynamic inheritance via either namespaces (preferred) or a dynamic class extension, but I haven't been able to find good examples of this implemented in the wild. In your answers, please suggest either an alternate pattern that would work for this use case or an example of dynamic inheritance done right. Please assume PHP 5.3 with namespaced code. Any code examples are greatly encouraged. The preferred constraints for the solution are: DAL class can be autoloaded. DAL classes don't share the same exact same namespace, but share the same class name. As an example, I would prefer to use classes named DbObject that use namespaces like Vm\Db\MySql and Vm\Db\Oracle. Table classes don't have to be rewritten with a change in DB type. The appropriate DB type is determined via a single setting only. That setting is the only thing that should need to change to interchange DB types. Ideally, the setting check should occur only once per page load, but I'm flexible on that.

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• C#: String Concatenation vs Format vs StringBuilder

  - by James Michael Hare

  I was looking through my groups’ C# coding standards the other day and there were a couple of legacy items in there that caught my eye.  They had been passed down from committee to committee so many times that no one even thought to second guess and try them for a long time.  It’s yet another example of how micro-optimizations can often get the best of us and cause us to write code that is not as maintainable as it could be for the sake of squeezing an extra ounce of performance out of our software. So the two standards in question were these, in paraphrase: Prefer StringBuilder or string.Format() to string concatenation. Prefer string.Equals() with case-insensitive option to string.ToUpper().Equals(). Now some of you may already know what my results are going to show, as these items have been compared before on many blogs, but I think it’s always worth repeating and trying these yourself.  So let’s dig in. The first test was a pretty standard one.  When concattenating strings, what is the best choice: StringBuilder, string concattenation, or string.Format()? So before we being I read in a number of iterations from the console and a length of each string to generate.  Then I generate that many random strings of the given length and an array to hold the results.  Why am I so keen to keep the results?  Because I want to be able to snapshot the memory and don’t want garbage collection to collect the strings, hence the array to keep hold of them.  I also didn’t want the random strings to be part of the allocation, so I pre-allocate them and the array up front before the snapshot.  So in the code snippets below: num – Number of iterations. strings – Array of randomly generated strings. results – Array to hold the results of the concatenation tests. timer – A System.Diagnostics.Stopwatch() instance to time code execution. start – Beginning memory size. stop – Ending memory size. after – Memory size after final GC. So first, let’s look at the concatenation loop: 1: // build num strings using concattenation. 2: for (int i = 0; i < num; i++) 3: { 4: results[i] = "This is test #" + i + " with a result of " + strings[i]; 5: } Pretty standard, right?  Next for string.Format(): 1: // build strings using string.Format() 2: for (int i = 0; i < num; i++) 3: { 4: results[i] = string.Format("This is test #{0} with a result of {1}", i, strings[i]); 5: }   Finally, StringBuilder: 1: // build strings using StringBuilder 2: for (int i = 0; i < num; i++) 3: { 4: var builder = new StringBuilder(); 5: builder.Append("This is test #"); 6: builder.Append(i); 7: builder.Append(" with a result of "); 8: builder.Append(strings[i]); 9: results[i] = builder.ToString(); 10: } So I take each of these loops, and time them by using a block like this: 1: // get the total amount of memory used, true tells it to run GC first. 2: start = System.GC.GetTotalMemory(true); 3:  4: // restart the timer 5: timer.Reset(); 6: timer.Start(); 7:  8: // *** code to time and measure goes here. *** 9:  10: // get the current amount of memory, stop the timer, then get memory after GC. 11: stop = System.GC.GetTotalMemory(false); 12: timer.Stop(); 13: other = System.GC.GetTotalMemory(true); So let’s look at what happens when I run each of these blocks through the timer and memory check at 500,000 iterations: 1: Operator + - Time: 547, Memory: 56104540/55595960 - 500000 2: string.Format() - Time: 749, Memory: 57295812/55595960 - 500000 3: StringBuilder - Time: 608, Memory: 55312888/55595960 – 500000   Egad!  string.Format brings up the rear and + triumphs, well, at least in terms of speed.  The concat burns more memory than StringBuilder but less than string.Format().  This shows two main things: StringBuilder is not always the panacea many think it is. The difference between any of the three is miniscule! The second point is extremely important!  You will often here people who will grasp at results and say, “look, operator + is 10% faster than StringBuilder so always use StringBuilder.”  Statements like this are a disservice and often misleading.  For example, if I had a good guess at what the size of the string would be, I could have preallocated my StringBuffer like so:   1: for (int i = 0; i < num; i++) 2: { 3: // pre-declare StringBuilder to have 100 char buffer. 4: var builder = new StringBuilder(100); 5: builder.Append("This is test #"); 6: builder.Append(i); 7: builder.Append(" with a result of "); 8: builder.Append(strings[i]); 9: results[i] = builder.ToString(); 10: }   Now let’s look at the times: 1: Operator + - Time: 551, Memory: 56104412/55595960 - 500000 2: string.Format() - Time: 753, Memory: 57296484/55595960 - 500000 3: StringBuilder - Time: 525, Memory: 59779156/55595960 - 500000   Whoa!  All of the sudden StringBuilder is back on top again!  But notice, it takes more memory now.  This makes perfect sense if you examine the IL behind the scenes.  Whenever you do a string concat (+) in your code, it examines the lengths of the arguments and creates a StringBuilder behind the scenes of the appropriate size for you. But even IF we know the approximate size of our StringBuilder, look how much less readable it is!  That’s why I feel you should always take into account both readability and performance.  After all, consider all these timings are over 500,000 iterations.   That’s at best  0.0004 ms difference per call which is neglidgable at best.  The key is to pick the best tool for the job.  What do I mean?  Consider these awesome words of wisdom: Concatenate (+) is best at concatenating.  StringBuilder is best when you need to building. Format is best at formatting. Totally Earth-shattering, right!  But if you consider it carefully, it actually has a lot of beauty in it’s simplicity.  Remember, there is no magic bullet.  If one of these always beat the others we’d only have one and not three choices. The fact is, the concattenation operator (+) has been optimized for speed and looks the cleanest for joining together a known set of strings in the simplest manner possible. StringBuilder, on the other hand, excels when you need to build a string of inderterminant length.  Use it in those times when you are looping till you hit a stop condition and building a result and it won’t steer you wrong. String.Format seems to be the looser from the stats, but consider which of these is more readable.  Yes, ignore the fact that you could do this with ToString() on a DateTime.  1: // build a date via concatenation 2: var date1 = (month < 10 ? string.Empty : "0") + month + '/' 3: + (day < 10 ? string.Empty : "0") + '/' + year; 4:  5: // build a date via string builder 6: var builder = new StringBuilder(10); 7: if (month < 10) builder.Append('0'); 8: builder.Append(month); 9: builder.Append('/'); 10: if (day < 10) builder.Append('0'); 11: builder.Append(day); 12: builder.Append('/'); 13: builder.Append(year); 14: var date2 = builder.ToString(); 15:  16: // build a date via string.Format 17: var date3 = string.Format("{0:00}/{1:00}/{2:0000}", month, day, year); 18:  So the strength in string.Format is that it makes constructing a formatted string easy to read.  Yes, it’s slower, but look at how much more elegant it is to do zero-padding and anything else string.Format does. So my lesson is, don’t look for the silver bullet!  Choose the best tool.  Micro-optimization almost always bites you in the end because you’re sacrificing readability for performance, which is almost exactly the wrong choice 90% of the time. I love the rules of optimization.  They’ve been stated before in many forms, but here’s how I always remember them: For Beginners: Do not optimize. For Experts: Do not optimize yet. It’s so true.  Most of the time on today’s modern hardware, a micro-second optimization at the sake of readability will net you nothing because it won’t be your bottleneck.  Code for readability, choose the best tool for the job which will usually be the most readable and maintainable as well.  Then, and only then, if you need that extra performance boost after profiling your code and exhausting all other options… then you can start to think about optimizing.

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• Rotate to a set degree then reverse and repeat in Unity

  - by Ryan

  and thank you for your time. I'm making my first project in Unity, a simple game where touching objects adds points to the players score. I'd like the objects to have a pleasant back and forth swaying animation on the Z axis. Nodding to the right 30 degrees, then to the left 30 degrees, on and on. Here's what I've got... public class Rotator : MonoBehaviour { void Update () { transform.Rotate(new Vector3(0,0,12)*Time.deltaTime); } } This gives me a nice slow rotation. But I am clueless how to tell Unity to stop at +30 degrees, reverse to -30 degrees, rotate again to +30, stop and repeat, etc, etc. I'd really appreciate any help. Maybe there is a thread like this that I was not able to find? I assume it will involve some kind of 'if than' function? Thank you, Ryan

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• PowerShell Try Catch Finally

  - by PointsToShare

  PowerShell Try Catch Finally I am a relative novice to PowerShell and tried (pun intended) to use the “Try Catch Finally” in my scripts. Alas the structure that we love and use in C# (or even – shudder of shudders - in VB) does not always work in PowerShell. It turns out that it works only when the error is a terminating error (whatever that means). Well, you can turn all your errors to the terminating kind by simply setting - $ErrorActionPreference = "Stop", And later resetting it back to “Continue”, which is its normal setting. Now, the lazy approach is to start all your scripts with: $ErrorActionPreference = "Stop" And ending all of them with: $ErrorActionPreference = "Continue" But this opens you to trouble because should your script have an error that you neglected to catch (it even happens to me!), your session will now have all its errors as “terminating”. Obviously this is not a good thing, so instead let’s put these two setups in the beginning of each Try block and in the Finally block as seen below: That’s All Folks!!

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• Prevent service from starting

  - by Evan Plaice

  So, I do Arduino development on my system to program arduinos using the FTDI USB programming interface (if you have no idea what this means don't worry). The issue arises because the FTDI interface uses tty to communicate and it conflicts with one of the default ubuntu services. The default service in question is called brltty (which enables braille accessibility for people with impaired vision). Considering that I don't have any particular use for this service and it's annoying to stop it manually (using 'service brltty stop') after I restart my system... Where would I configure this (or any) service to prevent it from loading on startup? Note: I also have this issue with qemu-kvm conflicting with virtualbox.

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• EMC Sets Its Sights on Automated Data Management

  EMC wants to be enterprises' one-stop shop for data management, but the company's vision doesn't end with storage.

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• ath9k driver does not weak up

  - by shantanu

  I know this is common question but i found no suitable answer, so i am asking this again. I installed ubuntu 11.10. I found the bug for ath9k, so set first network boot from BIOS menu. That's worked. I have upgraded to 12.04 yesterday. Now ath9k is creating problem again. First network boot is still enable. ath9k works at start. But failed(connect again and again) after couple of minutes. dmesg show error that it can not weak up in 500us. So i tried #compat-wireless-3.5.1-1. But result is same. I have also added #nohwcrypt=1 option in /etc/modeprob.d/ath9k.conf. Still no luck. I tried #rmmod and then modprobe sudo modprobe ath9k nohwcrypt=1 dmesg shows me error: [ 400.690086] ath9k: Driver unloaded [ 406.214329] ath9k 0000:06:00.0: enabling device (0000 -> 0002) [ 406.214348] ath9k 0000:06:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17 [ 406.214368] ath9k 0000:06:00.0: setting latency timer to 64 [ 406.428517] ath9k 0000:06:00.0: Failed to initialize device [ 406.428852] ath9k 0000:06:00.0: PCI INT A disabled [ 406.428887] ath9k: probe of 0000:06:00.0 failed with error -5 dmesg error when driver fail: 355.023521] ath: Chip reset failed [ 355.023524] ath: Unable to reset channel, reset status -22 [ 355.023556] ath: Unable to set channel [ 355.088569] ath: Failed to stop TX DMA, queues=0x10f! [ 355.122708] ath: DMA failed to stop in 10 ms AR_CR=0xffffffff AR_DIAG_SW=0xffffffff DMADBG_7=0xffffffff [ 355.122714] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up [ 355.263962] ath: Chip reset failed [ 355.263966] ath: Unable to reset channel (2437 MHz), reset status -22 [ 358.996063] ath: Failed to wakeup in 500us [ 364.004182] ath: Failed to wakeup in 500us I can not install fresh ubuntu because i have lots of application installed. System : Acer Aspire 4250 AMD dual core 1.6GHZ Atheros Communications Inc. AR9485 Wireless Network Adapter (rev 01) EDITED Now i am in serious problem. No wifi device is not showing in ifconfig or lshw commands. Only ether-net interface shows. I tried (FN + WIFI) several times to enable the device but nothing helps. Now I have installed fresh ubuntu 12.04. Please help lshw -c network: *-network description: Ethernet interface product: 82566DC Gigabit Network Connection vendor: Intel Corporation physical id: 19 bus info: pci@0000:00:19.0 logical name: eth0 version: 02 serial: 00:19:d1:7a:8e:f9 size: 100Mbit/s capacity: 1Gbit/s width: 32 bits clock: 33MHz capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.0.0-k duplex=full firmware=1.1-0 ip=192.168.1.114 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:45 memory:90300000-9031ffff memory:90324000-90324fff ioport:20c0(size=32) rfkill command does not show anything but no error.

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• Script to setup Ubuntu as a wireless access point on a bridge mode

  - by nixnotwin

  I use the following script to make my netbook a full-fledged wireless access point. It creates a bridge with eth0 and wlan0 and starts hostapd. #!/bin/bash service network-manager stop ifconfig eth0 0.0.0.0 #remove IP from eth0 ifconfig eth0 up #ensure the interface is up ifconfig wlan0 0.0.0.0 #remove IP from eth1 ifconfig wlan0 up #ensure the interface is up brctl addbr br0 #create br0 node hostapd -d /etc/hostapd/hostapd.conf > /var/log/hostapd.log & sleep 5 brctl addif br0 eth0 #add eth0 to bridge br0 brctl addif br0 wlan0 #add wlan0 to bridge br0 ifconfig br0 192.168.1.15 netmask 255.255.255.0 #ip for bridge ifconfig br0 up #bring up interface route add default gw 192.168.1.1 # gateway This script works efficiently. But if I want to revert back to use Network Manager, I cannot do it. The bridge simply cannot be deleted. How can I modify this script so that if I run bridge_script --stop, the bridge gets deleted, network manager starts and interfaces behave as if the machine had a fresh reboot.

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• SQLAuthority News – #TechEDIn – TechEd India 2012 – Things to Do and Explore for SQL Enthusiast

  - by pinaldave

  TechEd India 2012 is just 48 hours away and I have been receiving lots of requests regarding how SQL enthusiasts can maximize their time they’ll be spending at TechEd India 2012. Trust me – TechEd is the biggest Tech Event in India and it is much larger in magnitude than we can imagine. There are plenty of tracks there and lots of things to do. Honestly, we need clone ourselves multiple times to completely cover the event. However, I am going to talk about SQL enthusiasts only right now. In this post, I’ll share a few things they can do in this big event. But before I start talking about specific things, there is one thing which is a must – Keynote. There are amazing Keynotes planned every single day at TechEd India 2012. One should not miss them at all. Social Media I am a big believer of the social media. I am everywhere - Twitter, Facebook, LinkedIn and GPlus. I suggest you follow the tag #TechEdIn as well as contribute at the healthy conversation going on right now. You may want to follow a few of the SQL Server enthusiasts who are also attending events like TechEd India. This way, you will know where they are and you can contribute along with them. For a good start, you can follow all the speakers who are presenting at the event. I have linked all the speakers’ names with their respective Twitter accounts. Networking Do not stop meeting new people. Introduce yourself. Catch the speakers after their sessions. Meet other SQL experts and discuss SQL as well as life aside SQL. The best way to start the communication is to talk about something new. Here are a few lines I usually use when I have to break the ice: SQL Server 2012 is just released and I have installed it. How many SQL Server sessions are you going to attend? I am going to attend _________ I am a big fan of SQL Server. Sessions Agenda Day 1 T-SQL Rediscovered with SQL Server 2012 - Jacob Sebastian Catapult your data with SQL Server 2012 integration services - Praveen Srivatsa Processing Big Data with SQL Server 2012 and Hadoop  - Stephan Forte SQL Server Misconceptions and Resolution – A Practical Perspective – Pinal Dave and Vinod Kumar Securing with ContainedDB in SQL Server 2012  - Pranab Majumdar Agenda Day 2 Hand-on-Lab – Exploring Power View with SQL Server 2012 – Ravi S. Maniam Hand-on-Lab - SQL Server 2012 – AlwaysOn Availability Groups  - Amit Ganguli Agenda Day 3 Peeling SQL Server like an Onion: Internals Debunked  - Vinod Kumar Speed Up! – Parallel Processes and Unparalleled Performance  - Pinal Dave Keeping Your Database Available – ‘AlwaysOn’  - Balmukund Lakhani Lesser Known Facts of SQL Server Backup and Restore  - Amit Banerjee Top five reasons why you want SQL Server 2012 BI - Praveen Srivatsa Product Booth and Event Partners There will be a dedicated SQL Server booth at the event. I suggest you stop by there and do communication with SQL Server Experts. Additionally there will be booths of various event partners. Stop by their booth and see if they have a product which can help your career. I know that Pluralsight has recently released my course on their online learning site and if that interests you, you can talk about the subject with them. Bring Your Camera Make a list of the people you want to meet. Follow them on Twitter or send them an email and know their location. Introduce yourself, meet them and have your conversation. Do not forget to take a photo with them and later on, share the photo on social media. It would be nice to send an email to everyone with attached high resolution images if you have their email address. After-hours parties After-hours parties are not always about eating and meeting friends but sometimes, they are very informative. Last time I ended up meeting an SQL expert, and we end up talking for long hours on various aspects of SQL Server. After 4 hours, we figured out that he stays in the same apartment complex as mine and since we have had an excellent friendship, he has then become our family friend. So, my advice is that you start to seek out who is meeting where in the evening and see if you can get invited to the parties. Make new friends but never lose mutual respect by doing something silly. Meet Me I will be at the event for three days straight. I will be around the SQL tracks. Please stop by and introduce yourself. I would like to meet you and talk to you. Meeting folks from the Community is very important as we all speak the same language at the end of the day – SQL Server. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, SQLServer, T SQL, Technology

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• NightHacking Tour: Join the fun!

  - by terrencebarr

  My colleague and esteemed JavaFX hacker Stephen Chin is currently on the road on his NightHacking Tour through Europe, geeking with toys and projects, hacking code, and interviewing Java luminaries along the way. You might know the guy on the left – James Gosling was the first stop of the tour. What’s more, you can follow live on UStream at each stop along the way. Very cool! To learn all about the NightHacking Tour, check here.  Stephen will swing past my place in Freiburg, Germany, on Saturday (Nov 3). We’ll be chatting about all the stuff that’s happening in the embedded space these days and play with the latest small Java – if the demo gods allow For the latest UStream schedule and past recordings, go here. And follow #nighthacking on Twitter. Cheers, – Terrence Filed under: Mobile & Embedded Tagged: embedded, Java, Java Embedded, nighthacking

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• How to start /usr/bin/bitcoind on boot?

  - by André

  I'm trying to get /usr/bin/bitcoind to start on boot but without success. I have this script on /etc/init/bitcoind.conf description "bitcoind" start on filesystem stop on runlevel [!2345] oom never expect daemon respawn respawn limit 10 60 # 10 times in 60 seconds script user=andre home=/home/$user cmd=/usr/bin/bitcoind pidfile=$home/.bitcoin/bitcoind.pid # Don't change anything below here unless you know what you're doing [[ -e $pidfile && ! -d "/proc/$(cat $pidfile)" ]] && rm $pidfile [[ -e $pidfile && "$(cat /proc/$(cat $pidfile)/cmdline)" != $cmd* ]] && rm $pidfile exec start-stop-daemon --start -c $user --chdir $home --pidfile $pidfile --starta $cmd -b -m end script After creating this script I've run the command: sudo initctl reload-configuration When I restart Ubuntu the "bitcoind" does not start. I only can start "bitcoind" running manually the command: sudo start bitcoind Any clues on how to start "bitcoind" on boot?

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• Internet problems

  - by user288636

  I have a strange problem. When I copy/paste via ethernet everything is working fine. But when I go to youtube or downloading some files via internet, connection is freezing very often. Just stop downloading and after few minutes continue and than again stop and etc... Could it be hardware problem with network card or motherboard (network is integrated on board)? I am using Ubuntu 14.04 but it happens on live cd distribution of Mint. There is no restrictions cose when I using on same switch my other laptop with linux installed everything working fine.

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• Lubuntu: neither shut-down nor restart works

  - by Rantanplan

  aI have a freshly installed Lubuntu 14.04.1 (installed with forcepae option on a laptop with Pentium M processor). The only problem that I have found so far is that I cannot shut-down or restart the laptop. It always continues showing "Lubuntu" and some dots. Pressing Esc it says wait-for-state stop/waiting * Stopping rsync daemon rsync [OK] * Asking all remaining processes to terminate… [OK] * Killing all remaining processes… [fail] ModemManager [597] : <info> Caught signal, shutting down… ModemManager [597] : <info> ModemManager is shut down nm-dispatcher.action: Could not get the system bus. Make sure the message bus daemon is running! Message: Did not receive a reply. Possible causes: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. * Deactivating swap… [OK] * Will now halt The cursor remains blinking but the only way to switch it off is to hold the power-off key pressed for some seconds. I tried sudo shutdown -h now, sudo halt and sudo poweroff resulting in the same problem. I also tried to add acpi=force in GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" in /etc/default/grub and run sudo update-grub; then, using the taskbar's shot-down button lead to a direct stop of the laptop equal to holding the power-off key pressed for some seconds. Next I followed the answer http://askubuntu.com/a/202481/288322. Now, I directly receive some messages during shut-down starting wait-for-state stop/waiting * Stopping rsync daemon rsync [OK] * Asking all remaining processes to terminate… [OK] [ 240.944277] INFO: task kworker/0:2:24: block for more than 120 seconds. [ 240.944461] Tainted: G S 3.13.0-34-generic #60-Ubuntu [ 240.944623] "echo 0 > /proc/sys/kernel/hung_tasks_timeout_secs" disables this message. followed by some more similar lines and then: * Killing all remaining processes… [fail] ModemManager [576] : <info> Caught signal, shutting down… nm-dispatcher.action: Caught signal 15, shutting down... ModemManager [576] : <info> ModemManager is shut down * Deactivating swap… [OK] * Will now halt [ 600.944276] INFO: task kworker/0:2:24: block for more than 120 seconds. [ 600.944458] Tainted: G S 3.13.0-34-generic #60-Ubuntu [ 600.944619] "echo 0 > /proc/sys/kernel/hung_tasks_timeout_secs" disables this message. Then, nothing more was coming during the next 5 minutes. If you know where can I find relevant error information, I will be happy to search for them.

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• How can I prevent ubuntu from mounting particular partitions/deivices?

  - by Patryk

  I would like to stop Ubuntu from mounting my other (Windows') partitions automatically (since I do not need it really often - and especially I would like not to automount "System reserved" partition for Windows. There is a similar question here How can I stop Ubuntu 12.04 from mounting Fedora 16's Swap Partition? but! I do not have these partitions added in /etc/fstab. How can I do it ? For proof, my /etc/fstab proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda7 during installation UUID=1384cee0-6a71-4b83-b0d3-1338db925168 / ext4 errors=remount-ro 0 1 # swap was on /dev/sda6 during installation UUID=e3729117-b936-4c1d-9883-aee73dab6729 none swap sw 0 0 #------ MY WINDOWS D DRIVE---------- I WANT TO KEP IT UUID=98E8B14DE8B12A80 /media/d ntfs defaults,errors=remount-ro 0 0

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• Is WCF suitable for writing an application which is shared among applications?

  - by RPK

  I have developed and deployed few ASP.NET applications. Sometimes I want to stop the users from either inserting or updating a record when: Maintenance is going on. Stop operations due to payment delay. In one of my recent application I have implemented this feature to first check the database operations for locked status. If any of the above condition fulfils, database operations like insert and update are not carried out. I now need this feature in all the old applications and the future applications I build. I want to know whether WCF is suitable in this scenario as I want to share methods or an independent locking application among various other applications. Is WCF appropriate for this type of scenario?

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• Script to setup ubuntu as a wireless accesspoint on a bridge mode

  - by nixnotwin

  I use the following script to make my netbook a full-fledged wireless accesspoint. It creates a bridge with eth0 and wlan0 and starts hostapd. #!/bin/bash service network-manager stop ifconfig eth0 0.0.0.0 #remove IP from eth0 ifconfig eth0 up #ensure the interface is up ifconfig wlan0 0.0.0.0 #remove IP from eth1 ifconfig wlan0 up #ensure the interface is up brctl addbr br0 #create br0 node hostapd -d /etc/hostapd/hostapd.conf > /var/log/hostapd.log & sleep 5 brctl addif br0 eth0 #add eth0 to bridge br0 brctl addif br0 wlan0 #add wlan0 to bridge br0 ifconfig br0 192.168.1.15 netmask 255.255.255.0 #ip for bridge ifconfig br0 up #bring up interface route add default gw 192.168.1.1 # gateway This script works efficiently. But if I want to revert back to use Network Manager, I cannot do it. The bridge simply cannot be deleted. How can I modify this script so that if I run bridge_script --stop, the bridge gets deleted, network manager starts and interfaces behave as if the machine had a fresh reboot.

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• Flash completely freeze computer

  - by Yanick Rochon

  Since this morning, and ever so frequently, Flash will completely freeze the computer as soon as something launches it. First, the web page will stop responding, then the entire browser, and after about 2 seconds, the mouse and keyboard will stop responding and the computer will escalate to 100% usage, and all that's left is to perform a hard reboot. I tried re-installing Flash, downgrade my kernel, nothing will do. I'm running Mint 13 64-bit (based on Ubuntu 12.04) with XFCE (not Xubuntu, I installed XFCE as separate package). It never freezes otherwise, so I know it's caused by Flash. How do I solve this issue? What could cause this?

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• MySQL Creator Fights on Against Oracle

  Monty Widenius launches a new campaign to stop the Oracle-Sun merger.

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