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• What's wrong with cplusplus.com?

  - by Kerrek SB

  This is perhaps not a perfectly suitable forum for this question, but let me give it a shot, at the risk of being moved away. There are several references for the C++ standard library, including the invaluable ISO standard, MSDN, IBM, cppreference, and cplusplus. Personally, when writing C++ I need a reference that has quick random access, short load times and usage examples, and I've been finding cplusplus.com pretty useful. However, I've been hearing negative opinions about that website frequently here on SO, so I would like to get specific: What are the errors, misconceptions or bad pieces of advice given by cplusplus.com? What are the risks of using it to make coding decisions? Let me add this point: I want to be able to answer questions here on SO with accurate quotes of the standard, and thus I would like to post immediately-usable links, and cplusplus.com would have been my choice site were it not for this issue. Update: There have been many great responses, and I have seriously changed my view on cplusplus.com. I'd like to list a few choice results here; feel free to suggest more (and keep posting answers). As of June 29, 2011: Incorrect description of some algorithms (e.g. remove). Information about the behaviour of functions is sometimes incorrect (atoi), fails to mention special cases (strncpy), or omits vital information (iterator invalidation). Examples contain deprecated code (#include style). Inexact terminology is doing a disservice to learners and the general community ("STL", "compiler" vs "toolchain"). Incorrect and misleading description of the typeid keyword.

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• Android ListView scrolling to top

  - by aandroid

  Hi, I have a ListView with custom rows. When any of these rows is clicked, the ListView's data is regenerated. I'd like the list to scroll back to the top when this happens. I initially tried using setSelection(0) in each row's OnClickListener to achieve this but was unsuccessful (I believe because the ListView loses its scroll position when its data is invalidated - so my call to setSelection is undone. I still don't understand how the ListView decides where to scroll to after invalidation, though). The only working solution I know of was given by Romain Guy here: http://groups.google.com/group/android-developers/browse_thread/thread/127ca57414035301 It involves (View.post)ing the call to _listView.setSelection(0). I found this to perform quite poorly. The newly generated list shows up with it's scroll location unchanged and there is a considerable delay before it scrolls back to the top. Is there any better way to achieve this functionality? Any help would be much appreciated. Thanks!

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• Adding HTML to the DOM through the client.

  - by Mantorok

  Hi all Just wanted your views on the most efficient way to render content on demand, the reason this has come to light is that I'm maintaining a AA compliant website and we recently added video to it, and one of the techniques to avoid invalidation was to add the HTML for the video to the DOM after the page has loaded - which is fine and working ok. However, I found 2 possible techniques and I would appreciate some views, the one I'm currently using is an AJAX call that returns the HTML, the other technique is a hidden field that contains the HTML - I'm presently using the former. The main reason I'm asking the question is because there may be times when this particular control is also requested via an AJAX call, so I would end up with back-to-back AJAX calls, which seems a bit inefficient to me. I hope this makes sense, are there any better techniques to achieve this? Am I worrying too much over the consecutive AJAX calls? Thanks

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• Forcing Flex to update the screen?

  - by ABBarton

  This may be a bit of a beginners question, but I can't for the life of me figure it out. I'm using flex to develop a GUI for a large project, specifically a status bar along the bottom. Within my StatusBar class is a ProgressBar, which other classes doing work can tell to update(change bar completion and label) as they progress. The problem I'm encountering is that flex won't update whats shown on the screen until it's too late, for example ProgressBar initialized, 0% done some class sets the ProgressBar to be 12% done some class does some work some class sets the ProgressBar to be 56% done Whats happening is the 12% done is never displaying, it just hangs at 0% during the work, then skips right to 56% done. I've tried to understand the lifecycle of a flex component (invalidation and validation), and I think I understand it and am applying it correctly, but it's not working at all. I need to tell flex to redraw my StatusBar (or at least the ProgressBar within) after some class sets it to be 12% done, but before some class starts doing its work. How do I do this?

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• What in-client caching options work well with Cassandra and Java?

  - by sanity

  I'm currently architecting a system that must be capable of dealing with tens of thousands of writes per second. I am more-or-less settled on using Apache Cassandra for the persistence layer, and will be using Java for the application layer, but there are situations where I need to quickly access data in a way that picks up any changes within seconds. Hitting Cassandra every single time I need to check this data for changes will be too slow, which means I need to use some kind of application layer caching. To ensure that the cached data remains current, ideally it would support some kind of multicast-based cache invalidation. What are my options?

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• VirtualBox 4.2.14 is now available

  - by user12611829

  The VirtualBox development team has just released version 4.2.14, and it is now available for download. This is a maintenance release for version 4.2 and contains quite a few fixes. Here is the list from the official Changelog. VMM: another TLB invalidation fix for non-present pages VMM: fixed a performance regression (4.2.8 regression; bug #11674) GUI: fixed a crash on shutdown GUI: prevent stuck keys under certain conditions on Windows hosts (bugs #2613, #6171) VRDP: fixed a rare crash on the guest screen resize VRDP: allow to change VRDP parameters (including enabling/disabling the server) if the VM is paused USB: fixed passing through devices on Mac OS X host to a VM with 2 or more virtual CPUs (bug #7462) USB: fixed hang during isochronous transfer with certain devices (4.1 regression; Windows hosts only; bug #11839) USB: properly handle orphaned URBs (bug #11207) BIOS: fixed function for returning the PCI interrupt routing table (fixes NetWare 6.x guests) BIOS: don't use the ENTER / LEAVE instructions in the BIOS as these don't work in the real mode as set up by certain guests (e.g. Plan 9 and QNX 4) DMI: allow to configure DmiChassisType (bug #11832) Storage: fixed lost writes if iSCSI is used with snapshots and asynchronous I/O (bug #11479) Storage: fixed accessing certain VHDX images created by Windows 8 (bug #11502) Storage: fixed hang when creating a snapshot using Parallels disk images (bug #9617) 3D: seamless + 3D fixes (bug #11723) 3D: version 4.2.12 was not able to read saved states of older versions under certain conditions (bug #11718) Main/Properties: don't create a guest property for non-running VMs if the property does not exist and is about to be removed (bug #11765) Main/Properties: don't forget to make new guest properties persistent after the VM was terminated (bug #11719) Main/Display: don't lose seamless regions during screen resize Main/OVF: don't crash during import if the client forgot to call Appliance::interpret() (bug #10845) Main/OVF: don't create invalid appliances by stripping the file name if the VM name is very long (bug #11814) Main/OVF: don't fail if the appliance contains multiple file references (bug #10689) Main/Metrics: fixed Solaris file descriptor leak Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance and may trigger crashes VBoxManage: fixed setting the parent UUID on diff images using sethdparentuuid Linux hosts: work around for not crashing as a result of automatic NUMA balancing which was introduced in Linux 3.8 (bug #11610) Windows installer: force the installation of the public certificate in background (i.e. completely prevent user interaction) if the --silent command line option is specified Windows Additions: fixed problems with partial install in the unattended case Windows Additions: fixed display glitch with the Start button in seamless mode for some themes Windows Additions: Seamless mode and auto-resize fixes Windows Additions: fixed trying to to retrieve new auto-logon credentials if current ones were not processed yet Windows Additions installer: added the /with_wddm switch to select the experimental WDDM driver by default Linux Additions: fixed setting own timed out and aborted texts in information label of the lightdm greeter Linux Additions: fixed compilation against Linux 3.2.0 Ubuntu kernels (4.2.12 regression as a side effect of the Debian kernel build fix; bug #11709) X11 Additions: reduced the CPU load of VBoxClient in drag'and'drop mode OS/2 Additions: made the mouse wheel work (bug #6793) Guest Additions: fixed problems copying and pasting between two guests on an X11 host (bug #11792) The full changelog can be found here. You can download binaries for Solaris, Linux, Windows and MacOS hosts at http://www.virtualbox.org/wiki/Downloads Technocrati Tags: Oracle Virtualization VirtualBox

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• Java @Contented annotation to help reduce false sharing

  - by Dave

  See this posting by Aleksey Shipilev for details -- @Contended is something we've wanted for a long time. The JVM provides automatic layout and placement of fields. Usually it'll (a) sort fields by descending size to improve footprint, and (b) pack reference fields so the garbage collector can process a contiguous run of reference fields when tracing. @Contended gives the program a way to provide more explicit guidance with respect to concurrency and false sharing. Using this facility we can sequester hot frequently written shared fields away from other mostly read-only or cold fields. The simple rule is that read-sharing is cheap, and write-sharing is very expensive. We can also pack fields together that tend to be written together by the same thread at about the same time. More generally, we're trying to influence relative field placement to minimize coherency misses. Fields that are accessed closely together in time should be placed proximally in space to promote cache locality. That is, temporal locality should condition spatial locality. Fields accessed together in time should be nearby in space. That having been said, we have to be careful to avoid false sharing and excessive invalidation from coherence traffic. As such, we try to cluster or otherwise sequester fields that tend to written at approximately the same time by the same thread onto the same cache line. Note that there's a tension at play: if we try too hard to minimize single-threaded capacity misses then we can end up with excessive coherency misses running in a parallel environment. Theres no single optimal layout for both single-thread and multithreaded environments. And the ideal layout problem itself is NP-hard. Ideally, a JVM would employ hardware monitoring facilities to detect sharing behavior and change the layout on the fly. That's a bit difficult as we don't yet have the right plumbing to provide efficient and expedient information to the JVM. Hint: we need to disintermediate the OS and hypervisor. Another challenge is that raw field offsets are used in the unsafe facility, so we'd need to address that issue, possibly with an extra level of indirection. Finally, I'd like to be able to pack final fields together as well, as those are known to be read-only.

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• What's the best way to cache a growing database table for html generation?

  - by McLeopold

  I've got a database table which will grow in size by about 5000 rows a hour. For a key that I would be querying by, the query will grow in size by about 1 row every hour. I would like a web page to show the latest rows for a key, 50 at a time (this is configurable). I would like to try and implement memcache to keep database activity low for reads. If I run a query and create a cache result for each page of 50 results, that would work until a new entry is added. At that time, the page of latest results gets new result and the oldest results drops off. This cascades down the list of cached pages causing me to update every cache result. It seems like a poor design. I could build the cache pages backwards, then for each page requested I should get the latest 2 pages and truncate to the proper length of 50. I'm not sure if this is good or bad? Ideally, the mechanism I use to insert a new row would also know how to invalidate the proper cache results. Has someone already solved this problem in a widely acceptable way? What's the best method of doing this? EDIT: If my understanding of the MYSQL query cache is correct, it has table level granularity in invalidation. Given the fact that I have about 5000 updates before a query on a key should need to be invalidated, it seems that the database query cache would not be used. MS SQL caches execution plans and frequently accessed data pages, so it may do better in this scenario. My query is not against a single table with TOP N. One version has joins to several tables and another has sub-selects. Also, since I want to cache the html generated table, I'm wondering if a cache at the web server level would be appropriate? Is there really no benefit to any type of caching? Is the best advice really to just allow a website site query to go through all the layers and hit the database every request?

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• Setting SVN permissions with Dav SVN Authz

  - by Ken

  There seems to be a path inheritance issue which is boggling me over access restrictions. For instance, if I grant rw access one group/user, and wish to restrict it some /../../secret to none, it promptly spits in my face. Here is an example of what I'm trying to achieve in dav_svn.authz [groups] grp_W = a, b, c, g grp_X = a, d, f, e grp_Y = a, e, [/] * = @grp_Y = rw [somerepo1:/projectPot] @grp_W = rw [somerepo2:/projectKettle] @grp_X = rw What is expected: grp_Y has rw access to all repositories, while grp_W and grp_X only have access to their respective repositories. What occurs: grp_Y has access to all repositories, while grp_W and grp_X have access to nothing If I flip the access ordering where I give everyone access and restrict it in each repository, it promply ignores the invalidation rule (stripping of rights) and gives everyone the access granted at the root level. Forgoing groups, it performs the same with user specific provisions; even fully defined such as: [/] a = rw b = c = d = e = f = g = rw [somerepo1:/projectPot] a = rw b = rw c = rw d = e = rw f = g = rw [somerepo2:/projectKettle] a = rw b c d = rw e = rw f = rw g Which yields the exact same result. According to the documentation I'm following all protocols so this is insane. Running on Apache2 with dav_svn

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• Cache consistency & spawning a thread

  - by Dave Keck

  Background I've been reading through various books and articles to learn about processor caches, cache consistency, and memory barriers in the context of concurrent execution. So far though, I have been unable to determine whether a common coding practice of mine is safe in the strictest sense. Assumptions The following pseudo-code is executed on a two-processor machine: int sharedVar = 0; myThread() { print(sharedVar); } main() { sharedVar = 1; spawnThread(myThread); sleep(-1); } main() executes on processor 1 (P1), while myThread() executes on P2. Initially, sharedVar exists in the caches of both P1 and P2 with the initial value of 0 (due to some "warm-up code" that isn't shown above.) Question Strictly speaking – preferably without assuming any particular CPU – is myThread() guaranteed to print 1? With my newfound knowledge of processor caches, it seems entirely possible that at the time of the print() statement, P2 may not have received the invalidation request for sharedVar caused by P1's assignment in main(). Therefore, it seems possible that myThread() could print 0. References These are the related articles and books I've been reading. (It wouldn't allow me to format these as links because I'm a new user - sorry.) Shared Memory Consistency Models: A Tutorial hpl.hp.com/techreports/Compaq-DEC/WRL-95-7.pdf Memory Barriers: a Hardware View for Software Hackers rdrop.com/users/paulmck/scalability/paper/whymb.2009.04.05a.pdf Linux Kernel Memory Barriers kernel.org/doc/Documentation/memory-barriers.txt Computer Architecture: A Quantitative Approach amazon.com/Computer-Architecture-Quantitative-Approach-4th/dp/0123704901/ref=dp_ob_title_bk

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• AppFabric caching's local cache isnt working for us... What are we doing wrong?

  - by Olly

  We are using appfabric as the 2ndlevel cache for an NHibernate asp.net application comprising a customer facing website and an admin website. They are both connected to the same cache so when admin updates something, the customer facing site is updated. It seems to be working OK - we have a CacheCLuster on a seperate server and all is well but we want to enable localcache to get better performance, however, it dosnt seem to be working. We have enabled it like this... bool UseLocalCache = int LocalCacheObjectCount = int.MaxValue; TimeSpan LocalCacheDefaultTimeout = TimeSpan.FromMinutes(3); DataCacheLocalCacheInvalidationPolicy LocalCacheInvalidationPolicy = DataCacheLocalCacheInvalidationPolicy.TimeoutBased; if (UseLocalCache) { configuration.LocalCacheProperties = new DataCacheLocalCacheProperties( LocalCacheObjectCount, LocalCacheDefaultTimeout, LocalCacheInvalidationPolicy ); // configuration.NotificationProperties = new DataCacheNotificationProperties(500, TimeSpan.FromSeconds(300)); } Initially we tried using a timeout invalidation policy (3mins) and our app felt like it was running faster. HOWEVER, we noticed that if we changed something in the admin site, it was immediatley updated in the live site. As we are using timeouts not notifications, this demonstrates that the local cache isnt being queried (or is, but is always missing). The cache.GetType().Name returns "LocalCache" - so the factory has made a local cache. Running "Get-Cache-Statistics MyCache" in PS on my dev environment (asp.net app running local from vs2008, cache cluster running on a seperate w2k8 machine) show a handful of Request Counts. However, on the Production environment, the Request Count increases dramaticaly. We tried following the method here to se the cache cliebt-server traffic... http://blogs.msdn.com/b/appfabriccat/archive/2010/09/20/appfabric-cache-peeking-into-client-amp-server-wcf-communication.aspx but the log file had nothing but the initial header in it - i.e no loggin either. I cant find anything in SO or Google. Have we done something wrong? Have we got a screwy install of AppFabric - we installed it via WebPlatform Installer - I think? (note: the IIS box running ASp.net isnt in yhe cluster - it is just the client). Any insights greatfully received!

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• Python : How to close a UDP socket while is waiting for data in recv ?

  - by alexroat

  Hello, let's consider this code in python: import socket import threading import sys import select class UDPServer: def __init__(self): self.s=None self.t=None def start(self,port=8888): if not self.s: self.s=socket.socket(socket.AF_INET, socket.SOCK_DGRAM) self.s.bind(("",port)) self.t=threading.Thread(target=self.run) self.t.start() def stop(self): if self.s: self.s.close() self.t.join() self.t=None def run(self): while True: try: #receive data data,addr=self.s.recvfrom(1024) self.onPacket(addr,data) except: break self.s=None def onPacket(self,addr,data): print addr,data us=UDPServer() while True: sys.stdout.write("UDP server> ") cmd=sys.stdin.readline() if cmd=="start\n": print "starting server..." us.start(8888) print "done" elif cmd=="stop\n": print "stopping server..." us.stop() print "done" elif cmd=="quit\n": print "Quitting ..." us.stop() break; print "bye bye" It runs an interactive shell with which I can start and stop an UDP server. The server is implemented through a class which launches a thread in which there's a infinite loop of recv/*onPacket* callback inside a try/except block which should detect the error and the exits from the loop. What I expect is that when I type "stop" on the shell the socket is closed and an exception is raised by the recvfrom function because of the invalidation of the file descriptor. Instead, it seems that recvfrom still to block the thread waiting for data even after the close call. Why this strange behavior ? I've always used this patter to implements an UDP server in C++ and JAVA and it always worked. I've tried also with a "select" passing a list with the socket to the xread argument, in order to get an event of file descriptor disruption from select instead that from recvfrom, but select seems to be "insensible" to the close too. I need to have a unique code which maintain the same behavior on Linux and Windows with python 2.5 - 2.6. Thanks.

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• Caching vector addition over changing collections

  - by DRMacIver

  I have the following setup: I have a largish number of uuids (currently about 10k but expected to grow unboundedly - they're user IDs) and a function f : id - sparse vector with 32-bit integer values (no need to worry about precision). The function is reasonably expensive (not outrageously so, but probably on the order of a few 100ms for a given id). The dimension of the sparse vectors should be assumed to be infinite, as new dimensions can appear over time, but in practice is unlikely to ever exceed about 20k (and individual results of f are unlikely to have more than a few hundred non-zero values). I want to support the following operations efficiently: add a new ID to the collection invalidate an existing ID retrieve sum f(id) in O(changes since last retrieval) i.e. I want to cache the sum of the vectors in a way that's reasonable to do incrementally. One option would be to support a remove ID operation and treat invalidation as a remove followed by an add. The problem with this is that it requires us to keep track of all the old values of f, which is expensive in space. I potentially need to use many instances of this sort of cached structure, so I would like to avoid that. The likely usage pattern is that new IDs are added at a fairly continuous rate and are frequently invalidated at first. Ids which have been invalidated recently are much more likely to be invalidated again than ones which have remained valid for a long time, but in principle an old Id can still be invalidated. Ideally I don't want to do this in memory (or at least I want a way that lets me save the result to disk efficiently), so an idea which lets me piggyback off an existing DB implementation of some sort would be especially appreciated.

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• Sharepoint Error: [COMException (0x80004005): Cannot complete this action.

  - by ifunky

  Hi, I've created a site basic definition that uses different master and default pages. Everything works quite well except for whenever I create a new site based on the definition I receive the following error when browsing to the new site: [COMException (0x80004005): Cannot complete this action. Please try again.] Please try again.] Microsoft.SharePoint.Library.SPRequestInternalClass.GetFileAndMetaInfo(String bstrUrl, Byte bPageView, Byte bPageMode, Byte bGetBuildDependencySet, String bstrCurrentFolderUrl, Boolean& pbCanCustomizePages, Boolean& pbCanPersonalizeWebParts, Boolean& pbCanAddDeleteWebParts, Boolean& pbGhostedDocument, Boolean& pbDefaultToPersonal, String& pbstrSiteRoot, Guid& pgSiteId, UInt32& pdwVersion, String& pbstrTimeLastModified, String& pbstrContent, Byte& pVerGhostedSetupPath, UInt32& pdwPartCount, Object& pvarMetaData, Object& pvarMultipleMeetingDoclibRootFolders, String& pbstrRedirectUrl, Boolean& pbObjectIsList, Guid& pgListId, UInt32& pdwItemId, Int64& pllListFlags, Boolean& pbAccessDenied, Guid& pgDocId, Byte& piLevel, UInt64& ppermMask, Object& pvarBuildDependencySet, UInt32& pdwNumBuildDependencies, Object& pvarBuildDependencies, String& pbstrFolderUrl, String& pbstrContentTypeOrder) +0 Microsoft.SharePoint.Library.SPRequest.GetFileAndMetaInfo(String bstrUrl, Byte bPageView, Byte bPageMode, Byte bGetBuildDependencySet, String bstrCurrentFolderUrl, Boolean& pbCanCustomizePages, Boolean& pbCanPersonalizeWebParts, Boolean& pbCanAddDeleteWebParts, Boolean& pbGhostedDocument, Boolean& pbDefaultToPersonal, String& pbstrSiteRoot, Guid& pgSiteId, UInt32& pdwVersion, String& pbstrTimeLastModified, String& pbstrContent, Byte& pVerGhostedSetupPath, UInt32& pdwPartCount, Object& pvarMetaData, Object& pvarMultipleMeetingDoclibRootFolders, String& pbstrRedirectUrl, Boolean& pbObjectIsList, Guid& pgListId, UInt32& pdwItemId, Int64& pllListFlags, Boolean& pbAccessDenied, Guid& pgDocId, Byte& piLevel, UInt64& ppermMask, Object& pvarBuildDependencySet, UInt32& pdwNumBuildDependencies, Object& pvarBuildDependencies, String& pbstrFolderUrl, String& pbstrContentTypeOrder) +219 [SPException: Cannot complete this action. Please try again.] I'm able to work around this by checking out the new master page and checking it back in again and after doing so there are no further issues at all. Any ideas to what could cause this? Thanks Dan ONET.XML module section: <Modules> <Module Name="CustomMasterPage" List="116" Url="_catalogs/masterpage" RootWebOnly="FALSE"> <File Url="Shoes.master" Type="GhostableInLibrary" IgnoreIfAlreadyExists="TRUE" /> </Module> <Module Name="Default" List="116" Url=""> <File Url="default.aspx" Name="default.aspx" NavBarHome="True" IgnoreIfAlreadyExists="FALSE"> <AllUsersWebPart WebPartZoneID="Left" WebPartOrder="1"> &lt;webParts&gt;&lt;webPart xmlns="http://schemas.microsoft.com/WebPart/v3"&gt;&lt;metaData&gt;&lt;type name="BCM.SharePoint.Shoes.ShoesComponents.FooterLinks, BCM.SharePoint.Shoes.ShoesComponents, Version=1.0.0.0, Culture=neutral, PublicKeyToken=2881713f39360b71" /&gt;&lt;importErrorMessage&gt;Cannot import this Web Part.&lt;/importErrorMessage&gt;&lt;/metaData&gt;&lt;data&gt;&lt;properties&gt;&lt;property name="AllowClose" type="bool"&gt;True&lt;/property&gt;&lt;property name="Width" type="string" /&gt;&lt;property name="MyProperty" type="string"&gt;Hello SharePoint&lt;/property&gt;&lt;property name="AllowMinimize" type="bool"&gt;True&lt;/property&gt;&lt;property name="AllowConnect" type="bool"&gt;True&lt;/property&gt;&lt;property name="ChromeType" type="chrometype"&gt;None&lt;/property&gt;&lt;property name="TitleIconImageUrl" type="string"&gt;/_layouts/images/BCM_SharePoint_Shoes/wp_FooterLinks.gif&lt;/property&gt;&lt;property name="Description" type="string"&gt;FooterLinks Description&lt;/property&gt;&lt;property name="Hidden" type="bool"&gt;False&lt;/property&gt;&lt;property name="TitleUrl" type="string" /&gt;&lt;property name="AllowEdit" type="bool"&gt;True&lt;/property&gt;&lt;property name="Height" type="string" /&gt;&lt;property name="MissingAssembly" type="string"&gt;Cannot import this Web Part.&lt;/property&gt;&lt;property name="HelpUrl" type="string" /&gt;&lt;property name="Title" type="string" /&gt;&lt;property name="CatalogIconImageUrl" type="string"&gt;/_layouts/images/BCM_SharePoint_Shoes/wp_FooterLinks.gif&lt;/property&gt;&lt;property name="Direction" type="direction"&gt;NotSet&lt;/property&gt;&lt;property name="ChromeState" type="chromestate"&gt;Normal&lt;/property&gt;&lt;property name="AllowZoneChange" type="bool"&gt;True&lt;/property&gt;&lt;property name="AllowHide" type="bool"&gt;True&lt;/property&gt;&lt;property name="HelpMode" type="helpmode"&gt;Modeless&lt;/property&gt;&lt;property name="ExportMode" type="exportmode"&gt;All&lt;/property&gt;&lt;/properties&gt;&lt;/data&gt;&lt;/webPart&gt;&lt;/webParts&gt; </AllUsersWebPart> <AllUsersWebPart WebPartZoneID="Left" WebPartOrder="0"> &lt;webParts&gt;&lt;webPart xmlns="http://schemas.microsoft.com/WebPart/v3"&gt;&lt;metaData&gt;&lt;type name="BCM.SharePoint.Shoes.ShoesComponents.SubFooterLinks, BCM.SharePoint.Shoes.ShoesComponents, Version=1.0.0.0, Culture=neutral, PublicKeyToken=2881713f39360b71" /&gt;&lt;importErrorMessage&gt;Cannot import this Web Part.&lt;/importErrorMessage&gt;&lt;/metaData&gt;&lt;data&gt;&lt;properties&gt;&lt;property name="AllowClose" type="bool"&gt;True&lt;/property&gt;&lt;property name="Width" type="string" /&gt;&lt;property name="MyProperty" type="string"&gt;Hello SharePoint&lt;/property&gt;&lt;property name="AllowMinimize" type="bool"&gt;True&lt;/property&gt;&lt;property name="AllowConnect" type="bool"&gt;True&lt;/property&gt;&lt;property name="ChromeType" type="chrometype"&gt;None&lt;/property&gt;&lt;property name="TitleIconImageUrl" type="string"&gt;/_layouts/images/BCM_SharePoint_Shoes/wp_SubFooterLinks.gif&lt;/property&gt;&lt;property name="Description" type="string"&gt;Shoes home page links (under the hero image)&lt;/property&gt;&lt;property name="Hidden" type="bool"&gt;False&lt;/property&gt;&lt;property name="TitleUrl" type="string" /&gt;&lt;property name="AllowEdit" type="bool"&gt;True&lt;/property&gt;&lt;property name="Height" type="string" /&gt;&lt;property name="MissingAssembly" type="string"&gt;Cannot import this Web Part.&lt;/property&gt;&lt;property name="HelpUrl" type="string" /&gt;&lt;property name="Title" type="string" /&gt;&lt;property name="CatalogIconImageUrl" type="string"&gt;/_layouts/images/BCM_SharePoint_Shoes/wp_SubFooterLinks.gif&lt;/property&gt;&lt;property name="Direction" type="direction"&gt;NotSet&lt;/property&gt;&lt;property name="ChromeState" type="chromestate"&gt;Normal&lt;/property&gt;&lt;property name="AllowZoneChange" type="bool"&gt;True&lt;/property&gt;&lt;property name="AllowHide" type="bool"&gt;True&lt;/property&gt;&lt;property name="HelpMode" type="helpmode"&gt;Modeless&lt;/property&gt;&lt;property name="ExportMode" type="exportmode"&gt;All&lt;/property&gt;&lt;/properties&gt;&lt;/data&gt;&lt;/webPart&gt;&lt;/webParts&gt; </AllUsersWebPart> <NavBarPage Name="$Resources:core,nav_Home;" ID="1002" Position="Start" /> <NavBarPage Name="$Resources:core,nav_Home;" ID="0" Position="Start" /> </File> </Module> </Modules> LOG OUTPUT: 05/21/2010 12:22:55.11 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 72nz Medium Videntityinfo::isFreshToken reported failure. 05/21/2010 12:22:55.19 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services Fields 88yv Medium Creating default lists 05/21/2010 12:22:55.19 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 72lp Medium Creating directory Lists 05/21/2010 12:22:55.26 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services Fields 88yf Medium Creating list "Master Page Gallery" in web "http://mmm-dev-ll/sites/Shoes/test" at URL "_catalogs/masterpage", (setuppath: "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\Template\global\lists\mplib") 05/21/2010 12:22:55.28 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services Fields 88y1 Medium No document templates uploaded for list "Master Page Gallery" -- none found for list template "100". 05/21/2010 12:22:55.28 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 72kc Medium Failed to find generic XML file at "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\Template\xml\onet.xml", falling back to global site definition. 05/21/2010 12:22:56.22 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services Fields 88yz Medium Creating default modules at URL "http://mmm-dev-ll/sites/Shoes/test" 05/21/2010 12:22:56.22 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 8e27 Medium Ensuring module folder _catalogs/masterpage 05/21/2010 12:22:56.89 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 72h7 Medium Applying template "SubSite#1" to web at URL "http://mmm-dev-ll/sites/Shoes/test". 05/21/2010 12:22:57.09 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services Fields 88yy Medium Activating web-scoped features for template "SubSite#1" at URL "http://mmm-dev-ll/sites/Shoes/test" 05/21/2010 12:22:57.12 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 8l1c Medium Preparing 20 features for activation 05/21/2010 12:22:57.14 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 8l1d Medium Feature Activation: Batch Activating Features at URL http://mmm-dev-ll/sites/Shoes/test 'AnnouncementsList' (ID: '00bfea71-d1ce-42de-9c63-a44004ce0104'), 'ContactsList' (ID: '00bfea71-7e6d-4186-9ba8-c047ac750105'), 'CustomList' (ID: '00bfea71-de22-43b2-a848-c05709900100'), 'DataSourceLibrary' (ID: '00bfea71-f381-423d-b9d1-da7a54c50110'), 'DiscussionsList' (ID: '00bfea71-6a49-43fa-b535-d15c05500108'), 'DocumentLibrary' (ID: '00bfea71-e717-4e80-aa17-d0c71b360101'), 'EventsList' (ID: '00bfea71-ec85-4903-972d-ebe475780106'), 'GanttTasksList' (ID: '00bfea71-513d-4ca0-96c2-6a47775c0119'), 'GridList' (ID: '00bfea71-3a1d-41d3-a0ee-651d11570120'), 'IssuesList' (ID: '00bfea71-5932-4f9c-ad71-1557e5751100'), 'LinksList' (ID: '00bfea71-2062-426c-90bf-714c59600103'), 'NoCodeWorkflowLibrary' (ID: '00bfe... 05/21/2010 12:22:57.14* w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 8l1d Medium ...a71-f600-43f6-a895-40c0de7b0117'), 'PictureLibrary' (ID: '00bfea71-52d4-45b3-b544-b1c71b620109'), 'SurveysList' (ID: '00bfea71-eb8a-40b1-80c7-506be7590102'), 'TasksList' (ID: '00bfea71-a83e-497e-9ba0-7a5c597d0107'), 'WebPageLibrary' (ID: '00bfea71-c796-4402-9f2f-0eb9a6e71b18'), 'workflowProcessList' (ID: '00bfea71-2d77-4a75-9fca-76516689e21a'), 'WorkflowHistoryList' (ID: '00bfea71-4ea5-48d4-a4ad-305cf7030140'), 'XmlFormLibrary' (ID: '00bfea71-1e1d-4562-b56a-f05371bb0115'), 'TeamCollab' (ID: '00bfea71-4ea5-48d4-a4ad-7ea5c011abe5'), . 05/21/2010 12:22:57.15 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 8l1f Medium Feature Activation: Batch Activated Features at URL http://mmm-dev-ll/sites/Shoes/test 'AnnouncementsList' (ID: '00bfea71-d1ce-42de-9c63-a44004ce0104'), 'ContactsList' (ID: '00bfea71-7e6d-4186-9ba8-c047ac750105'), 'CustomList' (ID: '00bfea71-de22-43b2-a848-c05709900100'), 'DataSourceLibrary' (ID: '00bfea71-f381-423d-b9d1-da7a54c50110'), 'DiscussionsList' (ID: '00bfea71-6a49-43fa-b535-d15c05500108'), 'DocumentLibrary' (ID: '00bfea71-e717-4e80-aa17-d0c71b360101'), 'EventsList' (ID: '00bfea71-ec85-4903-972d-ebe475780106'), 'GanttTasksList' (ID: '00bfea71-513d-4ca0-96c2-6a47775c0119'), 'GridList' (ID: '00bfea71-3a1d-41d3-a0ee-651d11570120'), 'IssuesList' (ID: '00bfea71-5932-4f9c-ad71-1557e5751100'), 'LinksList' (ID: '00bfea71-2062-426c-90bf-714c59600103'), 'NoCodeWorkflowLibrary' (ID: '00bfea... 05/21/2010 12:22:57.15* w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 8l1f Medium ...71-f600-43f6-a895-40c0de7b0117'), 'PictureLibrary' (ID: '00bfea71-52d4-45b3-b544-b1c71b620109'), 'SurveysList' (ID: '00bfea71-eb8a-40b1-80c7-506be7590102'), 'TasksList' (ID: '00bfea71-a83e-497e-9ba0-7a5c597d0107'), 'WebPageLibrary' (ID: '00bfea71-c796-4402-9f2f-0eb9a6e71b18'), 'workflowProcessList' (ID: '00bfea71-2d77-4a75-9fca-76516689e21a'), 'WorkflowHistoryList' (ID: '00bfea71-4ea5-48d4-a4ad-305cf7030140'), 'XmlFormLibrary' (ID: '00bfea71-1e1d-4562-b56a-f05371bb0115'), 'TeamCollab' (ID: '00bfea71-4ea5-48d4-a4ad-7ea5c011abe5'), . 05/21/2010 12:22:57.15 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 88jb Medium Feature Activation: Activating Feature 'RadEditorFeatureRichText' (ID: '747755cd-d060-4663-961c-9b0cc43724e9') at URL http://mmm-dev-ll/sites/Shoes/test. 05/21/2010 12:22:57.15 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 75fb Medium Calling 'FeatureActivated' method of SPFeatureReceiver for Feature 'RadEditorFeatureRichText' (ID: '747755cd-d060-4663-961c-9b0cc43724e9'). 05/21/2010 12:22:57.20 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 75f8 Medium Feature Activation: Feature 'RadEditorFeatureRichText' (ID: '747755cd-d060-4663-961c-9b0cc43724e9') was activated at URL http://mmm-dev-ll/sites/Shoes/test. 05/21/2010 12:22:57.51 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services Fields 88yv Medium Creating default lists 05/21/2010 12:22:57.51 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 72lp Medium Creating directory Lists 05/21/2010 12:22:57.51 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services Fields 88yz Medium Creating default modules at URL "http://mmm-dev-ll/sites/Shoes/test" 05/21/2010 12:22:57.51 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 8e27 Medium Ensuring module folder _catalogs/masterpage 05/21/2010 12:22:57.56 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 72ix Medium Not enough information to determine a list for module "Default". Assuming no list for this module. 05/21/2010 12:22:57.87 w3wp.exe (0x1E40) 0x18A4 Windows SharePoint Services General 72h8 Medium Successfully applied template "SubSite#1" to web at URL "http://mmm-dev-ll/sites/Shoes/test". 05/21/2010 12:22:59.48 w3wp.exe (0x1E40) 0x0980 Windows SharePoint Services General 8e2s Medium Unknown SPRequest error occurred. More information: 0x80070057 05/21/2010 12:23:07.06 OWSTIMER.EXE (0x0884) 0x106C Office Server Setup and Upgrade 8u3j High Registry key value {SearchThrottled} was not found under registry hive {Software\Microsoft\Office Server\12.0}. Assuming search sku is not throttled. 05/21/2010 12:23:07.08 OWSTIMER.EXE (0x0884) 0x106C Search Server Common MS Search Administration 90gf Medium SQL: dbo.proc_MSS_PropagationGetQueryServers 05/21/2010 12:23:07.09 OWSTIMER.EXE (0x0884) 0x106C Search Server Common MS Search Administration 8wni High Resuming default catalog with reason 'GPR_PROPAGATION' for application 'SharedServices1'... 05/21/2010 12:23:07.11 OWSTIMER.EXE (0x0884) 0x106C Search Server Common MS Search Administration 8wnj High Resuming anchor text catalog with reason GPR_PROPAGATION' for application 'SharedServices1'... 05/21/2010 12:23:07.14 OWSTIMER.EXE (0x0884) 0x106C Search Server Common MS Search Administration 8dvl Medium Search application '3c6751cc-37b0-470a-bfa2-bfd0b5635fe1': Provision start addresses in default content source. 05/21/2010 12:23:07.15 OWSTIMER.EXE (0x0884) 0x106C Search Server Common MS Search Administration 7hmh High exception in SearchUpgradeProvisioner Keyword Config System.InvalidOperationException: jobServerSearchServiceInstance is null at Microsoft.Office.Server.Search.Administration.SearchUpgradeProvisioner..ctor(SearchServiceInstance searchServiceInstance) at Microsoft.Office.Server.Search.Administration.OSSPrimaryGathererProject.ProvisionContentSources() 05/21/2010 12:23:29.19 OWSTIMER.EXE (0x0884) 0x0FFC SharePoint Portal Server Business Data 79bv High Initiating BDC Cache Invalidation Check in AppDomain 'DefaultDomain' 05/21/2010 12:23:29.19 OWSTIMER.EXE (0x0884) 0x0FFC SharePoint Portal Server Business Data 79bx High Completed BDC Cache Invalidation Check in AppDomain 'DefaultDomain' 05/21/2010 12:23:45.84 OWSTIMER.EXE (0x0884) 0x08A8 SharePoint Portal Server SSO 8inc Medium In SSOService::Synch(), sso database conn string: 05/21/2010 12:23:50.80 OWSTIMER.EXE (0x0884) 0x0F14 Excel Services Excel Services Administration 8tqi Medium ExcelServerSharedWebApplication.Synchronize: Starting synchronize for instance of Excel Services in SSP 'SharedServices1'. 05/21/2010 12:23:50.80 OWSTIMER.EXE (0x0884) 0x0F14 Excel Services Excel Services Administration 8tqj Medium ExcelServerSharedWebApplication.Synchronize: Successfully synchronized instance of Excel Services in SSP 'SharedServices1'. 05/21/2010 12:23:52.31 w3wp.exe (0x1E40) 0x0980 SharePoint Portal Server Runtime 8gp7 Medium Topology cache updated. (AppDomain: /LM/W3SVC/1963195510/Root-1-129188762904047141)

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• NoSQL Memcached API for MySQL: Latest Updates

  - by Mat Keep

  With data volumes exploding, it is vital to be able to ingest and query data at high speed. For this reason, MySQL has implemented NoSQL interfaces directly to the InnoDB and MySQL Cluster (NDB) storage engines, which bypass the SQL layer completely. Without SQL parsing and optimization, Key-Value data can be written directly to MySQL tables up to 9x faster, while maintaining ACID guarantees. In addition, users can continue to run complex queries with SQL across the same data set, providing real-time analytics to the business or anonymizing sensitive data before loading to big data platforms such as Hadoop, while still maintaining all of the advantages of their existing relational database infrastructure. This and more is discussed in the latest Guide to MySQL and NoSQL where you can learn more about using the APIs to scale new generations of web, cloud, mobile and social applications on the world's most widely deployed open source database The native Memcached API is part of the MySQL 5.6 Release Candidate, and is already available in the GA release of MySQL Cluster. By using the ubiquitous Memcached API for writing and reading data, developers can preserve their investments in Memcached infrastructure by re-using existing Memcached clients, while also eliminating the need for application changes. Speed, when combined with flexibility, is essential in the world of growing data volumes and variability. Complementing NoSQL access, support for on-line DDL (Data Definition Language) operations in MySQL 5.6 and MySQL Cluster enables DevOps teams to dynamically update their database schema to accommodate rapidly changing requirements, such as the need to capture additional data generated by their applications. These changes can be made without database downtime. Using the Memcached interface, developers do not need to define a schema at all when using MySQL Cluster. Lets look a little more closely at the Memcached implementations for both InnoDB and MySQL Cluster. Memcached Implementation for InnoDB The Memcached API for InnoDB is previewed as part of the MySQL 5.6 Release Candidate. As illustrated in the following figure, Memcached for InnoDB is implemented via a Memcached daemon plug-in to the mysqld process, with the Memcached protocol mapped to the native InnoDB API. Figure 1: Memcached API Implementation for InnoDB With the Memcached daemon running in the same process space, users get very low latency access to their data while also leveraging the scalability enhancements delivered with InnoDB and a simple deployment and management model. Multiple web / application servers can remotely access the Memcached / InnoDB server to get direct access to a shared data set. With simultaneous SQL access, users can maintain all the advanced functionality offered by InnoDB including support for Foreign Keys, XA transactions and complex JOIN operations. Benchmarks demonstrate that the NoSQL Memcached API for InnoDB delivers up to 9x higher performance than the SQL interface when inserting new key/value pairs, with a single low-end commodity server supporting nearly 70,000 Transactions per Second. Figure 2: Over 9x Faster INSERT Operations The delivered performance demonstrates MySQL with the native Memcached NoSQL interface is well suited for high-speed inserts with the added assurance of transactional guarantees. You can check out the latest Memcached / InnoDB developments and benchmarks here You can learn how to configure the Memcached API for InnoDB here Memcached Implementation for MySQL Cluster Memcached API support for MySQL Cluster was introduced with General Availability (GA) of the 7.2 release, and joins an extensive range of NoSQL interfaces that are already available for MySQL Cluster Like Memcached, MySQL Cluster provides a distributed hash table with in-memory performance. MySQL Cluster extends Memcached functionality by adding support for write-intensive workloads, a full relational model with ACID compliance (including persistence), rich query support, auto-sharding and 99.999% availability, with extensive management and monitoring capabilities. All writes are committed directly to MySQL Cluster, eliminating cache invalidation and the overhead of data consistency checking to ensure complete synchronization between the database and cache. Figure 3: Memcached API Implementation with MySQL Cluster Implementation is simple: 1. The application sends reads and writes to the Memcached process (using the standard Memcached API). 2. This invokes the Memcached Driver for NDB (which is part of the same process) 3. The NDB API is called, providing for very quick access to the data held in MySQL Cluster’s data nodes. The solution has been designed to be very flexible, allowing the application architect to find a configuration that best fits their needs. It is possible to co-locate the Memcached API in either the data nodes or application nodes, or alternatively within a dedicated Memcached layer. The benefit of this flexible approach to deployment is that users can configure behavior on a per-key-prefix basis (through tables in MySQL Cluster) and the application doesn’t have to care – it just uses the Memcached API and relies on the software to store data in the right place(s) and to keep everything synchronized. Using Memcached for Schema-less Data By default, every Key / Value is written to the same table with each Key / Value pair stored in a single row – thus allowing schema-less data storage. Alternatively, the developer can define a key-prefix so that each value is linked to a pre-defined column in a specific table. Of course if the application needs to access the same data through SQL then developers can map key prefixes to existing table columns, enabling Memcached access to schema-structured data already stored in MySQL Cluster. Conclusion Download the Guide to MySQL and NoSQL to learn more about NoSQL APIs and how you can use them to scale new generations of web, cloud, mobile and social applications on the world's most widely deployed open source database See how to build a social app with MySQL Cluster and the Memcached API from our on-demand webinar or take a look at the docs Don't hesitate to use the comments section below for any questions you may have 

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• Help Repainting a Line

  - by serhio

  I am doing a custom control (inherited from VisualBasic.PowerPacks.LineShape), that should be painted like as standard one, but also having a Icon displayed near it. So, I just overrided OnPaint like this: protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { e.Graphics.DrawIcon(myIcon, StartPoint.X, StartPoint.Y); base.OnPaint(e); } Now, everything is OK, but when my control moves, the icon still remains drawn on the ancient place. Is there a way to paint it properly? The sample code for tests using Microsoft.VisualBasic.PowerPacks; using System.Windows.Forms; using System.Drawing; namespace LineShapeTest { /// /// Test Form /// public class Form1 : Form { IconLineShape myLine = new IconLineShape(); ShapeContainer shapeContainer1 = new ShapeContainer(); Panel panel1 = new Panel(); public Form1() { this.panel1.Dock = DockStyle.Fill; // load your back image here this.panel1.BackgroundImage = global::WindowsApplication22.Properties.Resources._13820t; this.panel1.Controls.Add(shapeContainer1); this.myLine.StartPoint = new Point(20, 30); this.myLine.EndPoint = new Point(80, 120); this.myLine.Parent = this.shapeContainer1; MouseEventHandler panelMouseMove = new MouseEventHandler(this.panel1_MouseMove); this.panel1.MouseMove += panelMouseMove; this.shapeContainer1.MouseMove += panelMouseMove; this.Controls.Add(panel1); } private void panel1_MouseMove(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { myLine.StartPoint = e.Location; } } } /// /// Test LineShape /// public class IconLineShape : LineShape { Icon myIcon = SystemIcons.Exclamation; protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { e.Graphics.DrawIcon(myIcon, StartPoint.X, StartPoint.Y); base.OnPaint(e); } } } Nota Bene, for the lineShape: Parent = ShapeContainer Parent.Parent = Panel Update 1 TRACES In this variant of OnPaint, we have traces: protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { Graphics g = Parent.Parent.CreateGraphics(); g.DrawIcon(myIcon, StartPoint.X, StartPoint.Y); base.OnPaint(e); } Update 2 BLINKS In this variant of OnPaint, we have a blinking image: protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { Parent.Parent.Invalidate(this.Region, true); Graphics g = Parent.Parent.CreateGraphics(); g.DrawIcon(myIcon, StartPoint.X, StartPoint.Y); base.OnPaint(e); } Update 3: External Invalidation This variant works well, but... from exterior of IconLineShape class: private void panel1_MouseMove(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { Region r = myLine.Region; myLine.StartPoint = e.Location; panel1.Invalidate(r); } } /// /// Test LineShape /// public class IconLineShape : LineShape { Icon myIcon = SystemIcons.Exclamation; Graphics parentGraphics; protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { parentGraphics.DrawIcon(myIcon, StartPoint.X, StartPoint.Y); base.OnPaint(e); } protected override void OnParentChanged(System.EventArgs e) { // Parent is a ShapeContainer // Parent.Parent is a Panel parentGraphics = Parent.Parent.CreateGraphics(); base.OnParentChanged(e); } } Even this resolves the problem of the test example, I need this control to be done inside the control, because I can't force the external "clients" of this control do not forget to save the old region and invalidate the parent each time changing a location...

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