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  • Supervisor callback for child normal exit

    - by Aler
    I am creating a test app where is one supervisor with simple_one_for_one strategy and many worker children added dynamically to it. How to implement callback (or receive a message) in supervisor that will be called when child exit normally? Main goal is to notify some other process that all supervised worker processes are done and it's time to show final report. How to design such kind of behavior? Should I create my own behavior that combine supervisor and gen_server, or there is a way to do this with standard otp behaviors?

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  • Kernel thread exit in linux

    - by Raffo
    Hi guys, I'm here to ask you the difference between a process and a thread in linux. I know that a thread for linux is just a "task", which shares with the father process things that they need to have in common (the address space and other important informations). I also know that the two are creating calling the same function ('clone()'), but there's still something that I'm missing: what really happens when a thread exit? What function is called inside the linux kernel? I know that when a process exits calls the do_exit function, but here or somewhere else there should be a way to understand if it is just a thread exiting or a whole process. Can you explain me this thing or redirect to some textbook?? I tried 'Understanding the linux kernel' but I was not satisfied with it. I'm asking this thing because a need to add things to the task_struct struct, but I need to discriminate how to manage those informations for a process and its children. Thank you.

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  • handle exit event of child process

    - by Ehsan
    I have a console application and in the Main method. I start a process like the code below, when process exists, the Exist event of the process is fired but it closed my console application too, I just want to start a process and then in exit event of that process start another process. It is also wired that process output is reflecting in my main console application. Process newCrawler = new Process(); newCrawler.StartInfo = new ProcessStartInfo(); newCrawler.StartInfo.FileName = configSection.CrawlerPath; newCrawler.EnableRaisingEvents = true; newCrawler.Exited += new EventHandler(newCrawler_Exited); newCrawler.StartInfo.Arguments = "someArg"; newCrawler.StartInfo.WindowStyle = ProcessWindowStyle.Hidden; newCrawler.StartInfo.UseShellExecute = false; newCrawler.Start();

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  • Code won't exit foreach block

    - by Matt
    I've got the following C# code segment that takes a list, finds objects that are ready to update, then shoves them into a temp list, deletes from the main list, and then goes on its merry way. My issue is that the foreach block, which cycles through my main list, won't exit. TempLog.Clear(); //Ensure TempLog is empty foreach (CLogger ready in PlayerLog) { if (ready.UpdateReady == true) // Record is ready to be updated in database { TempLog.Add(ready); // Add record to templog PlayerLog.Remove(ready); // Remove from playerlog } } <---- Never reaches this point if (TempLog.Count > 0) // Just check that templog isn't empty { new Thread(Update).Start(); // Run update code } I've put heaps of debugging in, and I can watch PlayerLog start at 1, TempLog at 0, then it enters the foreach loop, picks up that the record UpdateReady flag is on, TempLog goes to 1, PlayerLog goes to 0, then it just stops.. No errors, just stops.. Thanks for the help :)

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  • Android SharedPreferences set True or False - Clear on App Exit

    - by KickingLettuce
    I want a notification to pop up when an app opens. But once User dismisses, I don't want it to come back again, even if they go back to the same activity. But when the app exits, and they come back later, I want same dialog notification to pop up (prompting user to login). So basically... boolean b = true; if (b == true) { // show dialog b = false; } I simply want var b to save state but clear on exit.

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  • How do I make child thread exit when main thread exit?

    - by httpinterpret
    void forloop2() { int i = 0; while(TRUE) { printf("forloop2\n"); } } int main() { GThread *Thread1; GtkWidget *window; g_thread_init(NULL); gdk_threads_init(); gdk_threads_enter (); Thread1 = g_thread_create((GThreadFunc)forloop2, NULL, TRUE, NULL); gtk_init(NULL, NULL); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_widget_show_all (window); gtk_main(); g_thread_join(Thread1); gdk_threads_leave (); } When I close the window, how to make Thread1 also exit?

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  • Monitor multiple variable amounts of processes' start and exit

    - by ron975
    I need some code to monitor the start and exit of processes. For example, assume I have a config file with 3 processe names, lets say, foo.exe, bar.exe and abc.exe. How I imagine this be done would be to create 3 threads and somehow listen to each process individually with a timer in each thread, and then do something afterwards. However, I would need to dynamically create threads and timers, as the config file is meant to be modifiable. I can work with VB.NET or C# Code. Thanks.

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  • Android: Capturing the return of an activity.

    - by Chrispix
    I have a question regarding launching new activities. It boils down to this. I have 3 tabs on a view A) contains gMap activity B) camera activity C) some random text fields. Requirement is that the application runs in Portrait mode. All 3 tabs work as expected w/ the exception of the Camera Preview Surface (B). It is rotated 90 degrees. They only way to make it correct is to set the app to landscape which throws all my tabs around, and is pretty much unworkable. My solution is this : replace my camera activity with a regular activity that is empty w/ the exception of Intent i = new Intent(this,CameraActivity.class); startActivity(i); This launches my CameraActivity. And that works fine. I had to do a linear layout and include 3 images that look like real tabs, so I can try and mimic the operation of the tabs while rotating the screen to landscape and keep the visuals as portrait. The user can click one of the images(buttons) to display the next tab. This is my issue. It should exit my 'camera activity' returning to the 'blank activity' in a tab, where it should be interpreted to click the desiered tab from my image. The main thing is, when it returns, it returns to a blank (black) page under a tab (because it is 'empty'). How can I capture the return event back to the page that called the activity, and then see what action they performed? I can set an onclicklistener where I can respond to the fake tabs (images) being clicked to exit out of the camera activity. On exit, the tab should update so that is where you return. any Suggestions? Thanks,

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  • On automating a split-mirror ASM backup with EMC TimeFinder ...

    - by [email protected]
    Normal 0 21 false false false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Hi clerks,   Offloading the backup operation to another host using disk cloning could really improve the performance on highly busy databases ( 24x7, zero downtime and all this stuff ...) There are well know white papers on this subject, ASM included, but today Im showing you a nice way to automate the procedure using shell scripting with EMC TimeFinder technologies:   Assumptions: *********** ASM diskgroups name:   +data_${db_name} : asm data diskgroup +fra_${db_name} :  asm fra  diskgroup   EMC Time Finder sync groups name:   rac_${DB_NAME}_data_tf : data group rac_${DB_NAME}_fra_tf:   fra group     There are two scripts, one located on the production box ( bck_database.sh ) and the other one on the backup server node ( bck_database_mirror.sh ) The second one is remotly executed from the production host There are a bunch of variables along the code with selfexplanatory names I guess, anyway let me know if you want some help     #!/bin/ksh ### ###  Copyright (c) 1988, 2010, Oracle Corporation.  All Rights Reserved. ### ###    NAME ###     bck_database.sh ### ###    DESCRIPTION ###     Database backup on third mirror ### ###    RETURNS ### ###    NOTES ### ###    MODIFIED                                 (DD/MM/YY) ###    Oracle            28/01/10             - Creacion ###   V_DATE=`/bin/date +%Y%m%d_%H%M%S` V_FICH_LOG=`dirname $0`/trace_dir_location/`basename $0`.${V_DATE}.log exec 4>&1 tee ${V_FICH_LOG} >&4 |& exec 1>&p 2>&1     ADMIN_DIR=`dirname $0` . ${ADMIN_DIR}/setenv_instance.sh -- This script should set the instance vars like Oracle Home, Sid, db_name ... if [ $? -ne 0 ] then   echo "Error when setting the environment."   exit 1 fi   echo "${V_DATE} ####################################################" echo "Executing database backup: ${DB_NAME}" echo "####################################################################"   V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Sync asm data diskgroups ..." echo "####################################################################" sudo symmir -g rac_${DB_NAME}_data_tf establish -noprompt if [ $? -ne 0 ] then   echo "Error when sync asm data diskgroups"   exit 2 fi V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Verifying asm data disks ..." echo "####################################################################" sudo symmir -g rac_${DB_NAME}_data_tf -i 30 verify if [ $? -ne 0 ] then   echo "Error when verifying asm data diskgroups"   exit 3 fi     V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Sync asm fra diskgroups ..." echo "####################################################################" sudo symmir -g rac_${DB_NAME}_fra_tf establish -noprompt if [ $? -ne 0 ] then   echo "Error when sync asm fra diskgroups"   exit 4 fi V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Verifying asm fra disks ..." echo "####################################################################" sudo symmir -g rac_${DB_NAME}_fra_tf -i 30 verify if [ $? -ne 0 ] then   echo "Error when verifying asm fra diskgroups"   exit 5 fi   V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "ASM sync sucessfully completed!" echo "####################################################################"     V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Updating status ${DB_NAME} to BEGIN BACKUP ..." echo "####################################################################" sqlplus -s /nolog <<-!   whenever sqlerror exit 1   connect / as sysdba   whenever sqlerror exit   alter system archive log current;   alter database ${DB_NAME} begin backup; ! if [ $? -ne 0 ] then   echo "Error when updating database status to BEGIN backup"   exit 6 fi   V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Splitting asm data disks....." echo "####################################################################" sudo symmir -g rac_${DB_NAME}_data_tf split -noprompt if [ $? -ne 0 ] then   echo "Error when splitting asm data disks"   exit 7 fi   V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Updating status ${DB_NAME} to END BACKUP ..." echo "####################################################################" sqlplus -s /nolog <<-!   whenever sqlerror exit 1   connect / as sysdba   whenever sqlerror exit   alter database ${DB_NAME} end backup;   alter system archive log current; ! if [ $? -ne 0 ] then   echo "Error when updating database status to END backup"   exit 8 fi   V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Generating controlfile copies...." echo "####################################################################" rman<<-! connect target / run { allocate channel ch1 type DISK; copy current controlfile to '+FRA_${DB_NAME}/${DB_NAME}/CONTROLFILE/control_mount.ctl'; copy current controlfile to '+FRA_${DB_NAME}/${DB_NAME}/CONTROLFILE/control_backup.ctl'; } ! if [ $? -ne 0 ] then   echo "Error generating controlfile copies"   exit 9 fi V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Resync RMAN catalog ....." echo "####################################################################" rman<<-! connect target / connect catalog ${V_RMAN_USR}/${V_RMAN_PWD}@${V_DB_CATALOG} resync catalog; ! if [ $? -ne 0 ] then   echo "Error when resyncing RMAN catalog"   exit 10 fi   V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Splitting asm fra disks....." echo "####################################################################" sudo symmir -g rac_${DB_NAME}_fra_tf split -noprompt if [ $? -ne 0 ] then   echo "Error when splitting asm fra disks"   exit 11 fi     echo "WARNING!: Calling bck_database_mirror.sh host ${NODE_BCK_SERVER}..." ssh ${NODO_BCK_SERVER} ${ADMIN_DIR_BCK}/bck_database_mirror.sh if [ $? -ne 0 ] then   echo "Error, when remote executing the backup "   exit 12 fi V_DATE=`/bin/date +%Y%m%d_%H%M%S` echo "${V_DATE} ####################################################" echo "Cleaning the archived redo logs already copied to tape ..." echo "####################################################################" rman<<-! connect target / connect catalog ${V_RMAN_USR}/${V_RMAN_PWD}@${V_DB_CATALOG} run { resync catalog; delete noprompt archivelog all backed up 1 times to device type sbt; } ! if [ $? -ne 0 ] then   echo "Error when cleaning the archived redo logs"   exit 13 fi echo "${V_DATE} ####################################################" echo "Backup sucessfully executed!!" echo "####################################################################" exit 0   ------------------------------------------------------------------------------ ------------------------** BACKUP SERVER NODE ** ----------------------------- ------------------------------------------------------------------------------   #!/bin/ksh ### ###  Copyright (c) 1988, 2010, Oracle Corporation.  All Rights Reserved. ### ###    ###    NAME ###     bck_database_mirror.sh ### ###    DESCRIPTION ###      Backup @ backup server ### ###    RETURNS ### ###    NOTES ### ###    MODIFIED                                 (DD/MM/YY) ###      Oracle                    28/01/10     - Creacion         V_DATE=`/bin/date +%Y%m%d_%H%M%S`   echo "${V_DATE} ####################################################"   echo "Starting ASM instance ..."   echo "####################################################################"   ${V_ADMIN_DIR}/start_asm.sh -- This script is supposed to start the ASM instance in the backup server   if [ $? -ne 0 ]   then     echo "Error when tying to start ASM instance."     exit 1   fi       . ${V_ADMIN_DIR}/setenv_asm.sh -- This script is supposed to set the env. variables of the ASM instance   if [ $? -ne 0 ]   then     echo "Error when setting the ASM environment"     exit 1   fi       V_DATE=`/bin/date +%Y%m%d_%H%M%S`   echo "${V_DATE} ####################################################"   echo "The asm diskgroups/disks dettected are the following ..."   echo "####################################################################"     sqlplus /nolog <<-!     whenever sqlerror exit 1     connect / as sysdba     whenever sqlerror exit     SET LINES 200     COL PATH FORMAT A25     SELECT DISK.MOUNT_STATUS, DISK.PATH, DISK.NAME, DISK_GROUP.NAME, DISK_GROUP.TOTAL_MB FROM V\$ASM_DISK DISK, V\$ASM_DISKGROUP DISK_GROUP WHERE DISK.GROUP_NUMBER=DISK_GROUP.GROUP_NUMBER; !       V_ADMIN_DIR=`dirname $0`   . ${V_ADMIN_DIR}/setenv_instance.sh -- This script is supposed to set the env. variables of the database instance   if [ $? -ne 0 ]   then     echo "Error when setting the database instance environment"     exit 1   fi     V_DATE=`/bin/date +%Y%m%d_%H%M%S`   echo "${V_DATE} ####################################################"   echo "Starting ${DB_NAME} in MOUNT mode..."   echo "####################################################################"   ${V_ADMIN_DIR}/start_instance_mount.sh -- This script is supposed to do a startup mount   if [ $? -ne 0 ]   then     echo "Error starting  ${DB_NAME} in MOUNT mode"     exit 1   fi   V_DATE=`/bin/date +%Y%m%d_%H%M%S`   echo "${V_DATE} ####################################################"   echo "Executing RMAN backup..."   echo "####################################################################"   rman<<-!   connect target /   connect catalog ${V_RMAN_USR}/${V_RMAN_PWD}@${V_DB_CATALOG}   run {   allocate channel ch1 type 'SBT_TAPE' parms'ENV=(TDPO_OPTFILE=/opt/tivoli/tsm/client/oracle/bin64/tdpo.opt)'; -- TDPO Media Library   crosscheck archivelog all;   backup tag BCK_CONTROLFILE_ST_${DB_NAME}   format 'ctl_%d_%s__%p_%t'   controlfilecopy '+FRA_${DB_NAME}/${DB_NAME}/CONTROLFILE/control_backup.ctl';   backup tag BCK_DATAFILE_ST_${DB_NAME} full   format 'db_%d_%s_%p_%t'database;   backup tag BCK_ARCHLOG_ST_${DB_NAME} format 'al_%d_%s_%p_%t' archivelog all;   release channel ch1;   } !   if [ $? -ne 0 ]   then     echo "Error executing the RMAN backup"     exit 1   fi     ${V_ADMIN_DIR}/stop_instance_immediate.sh -- This script is supposed to do a shutdown immediate of the database instance   ${ADMIN_DIR}/stop_asm_immediate.sh -- This script is supposed to do a shutdown immediate of the ASM instance   exit 0     fi   Hope it helps someone! --L

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  • Platform Builder: Building Cloned Code from Multiple OS Versions

    - by Bruce Eitman
    My career goal is to delete more code than I write, and so far I have been fairly successful. But of course once in a while I need to clone code from the public tree which is contrary to my goal. Usually what follows is a new OS release. To help reach my goal, my team uses the same BSP code for multiple versions of the OS. That means that we need to handle the cloned code so that the correct code builds for the OS version that we are working on. To handle this we could use SKIPBUILD in the sources file, but that gets messy if the cloned code contains multiple folders. The solution that we use is to have a parent folder with subfolders that contain the OS version number. Example: PM |-PM500 |-PM600 |-PM700 The version number corresponds to the environment variable _WINCEOSVER. Then we have a simple DIRS file in the parent folder: DIRS=PM$( _WINCEOSVER) Which automatically selects the folder that goes with the OS version that we are building.   Copyright © 2010 – Bruce Eitman All Rights Reserved

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  • Lightweight PHP/HTML/CSS editor with code browser

    - by Nisto
    I'm looking for a freeware editor which has; syntax highlighting and a code browser (or code suggestions/hints). Preferably freeware license! I've tried out quite a few editors, but a lot of them are unfortunately very resource heavy and provides a lot more functions than I ever needed. So far, there's two editors that I really like, and is lightweight: jEdit and Notepad++. Although, unfortunately... Notepad++ doesn't have code browser support for both control structures and functions for PHP. Also, there's no code browser for HTML... I really liked jEdit as well, but there doesn't seem to be a code browser for it. Except for maybe Completion, but it's a bothersome plugin, and doesn't show the code browser unless you type something in and press CTRL+B. Other editors I've tried, but wasn't satisfied with: Adobe Dreamweaver CodeLobster PHP Edition Aptana Studio Komodo Edit EditPlus BlueFish PHP Designer 2007 - Personal PhpStorm Scriptly Eclipse UltraEdit Notepad2 EditPad Pro Rapid PHP EDIT I'm using Windows XP

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  • How does whitespace affect Python code?

    - by Codereview
    I've started programming about a year ago, I've learned the C and C++ languages and bits of Java. Recently I've started to learn the Python language (Notable: I'm using the Eclipse IDE). I'm used to formatting my code with whitespace, placing statements a bit to the right of my code for easier readability. Since I started working with Python it seems whitespace is a problem, I get some unnecessary whitespace warnings, and my code gets underlined (In eclipse). After a while I figured Python is very restrictive about whitespace for some reason, so I've been looking for the effects of whitespace on Python code. How does it affect the code? Does the code work different with unnecessary whitespace?

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  • Why is design by contract considered an alternative to the pseudo programming process?

    - by zoopp
    Right now I'm reading Code Complete by Steve McConnell and in chapter 9 he talks about the Pseudo Programming Process (PPP). From what I've understood, the PPP is a way of programming in which the programmer first writes the pseudo code for the routine he's working on, then refines it up to the point where pretty much each pseudo code line can be implemented in 1-3 lines of code, then writes the code in the designated programming language and finally the pseudo code is saved as comments for the purpose of documenting the routine. In chapter 9.4 the author mentions alternatives to the PPP, one of which is 'design by contract'. In design by contract you basically assert preconditions and postconditions of each routine. Now why would that be considered an alternative? To me it seems obvious that I should use both techniques at the same time and not chose one over the other.

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  • Code Reuse is (Damn) Hard

    - by James Michael Hare
    Being a development team lead, the task of interviewing new candidates was part of my job.  Like any typical interview, we started with some easy questions to get them warmed up and help calm their nerves before hitting the hard stuff. One of those easier questions was almost always: “Name some benefits of object-oriented development.”  Nearly every time, the candidate would chime in with a plethora of canned answers which typically included: “it helps ease code reuse.”  Of course, this is a gross oversimplification.  Tools only ease reuse, its developers that ultimately can cause code to be reusable or not, regardless of the language or methodology. But it did get me thinking…  we always used to say that as part of our mantra as to why Object-Oriented Programming was so great.  With polymorphism, inheritance, encapsulation, etc. we in essence set up the concepts to help facilitate reuse as much as possible.  And yes, as a developer now of many years, I unquestionably held that belief for ages before it really struck me how my views on reuse have jaded over the years.  In fact, in many ways Agile rightly eschews reuse as taking a backseat to developing what's needed for the here and now.  It used to be I was in complete opposition to that view, but more and more I've come to see the logic in it.  Too many times I've seen developers (myself included) get lost in design paralysis trying to come up with the perfect abstraction that would stand all time.  Nearly without fail, all of these pieces of code become obsolete in a matter of months or years. It’s not that I don’t like reuse – it’s just that reuse is hard.  In fact, reuse is DAMN hard.  Many times it is just a distraction that eats up architect and developer time, and worse yet can be counter-productive and force wrong decisions.  Now don’t get me wrong, I love the idea of reusable code when it makes sense.  These are in the few cases where you are designing something that is inherently reusable.  The problem is, most business-class code is inherently unfit for reuse! Furthermore, the code that is reusable will often fail to be reused if you don’t have the proper framework in place for effective reuse that includes standardized versioning, building, releasing, and documenting the components.  That should always be standard across the board when promoting reusable code.  All of this is hard, and it should only be done when you have code that is truly reusable or you will be exerting a large amount of development effort for very little bang for your buck. But my goal here is not to get into how to reuse (that is a topic unto itself) but what should be reused.  First, let’s look at an extension method.  There’s many times where I want to kick off a thread to handle a task, then when I want to reign that thread in of course I want to do a Join on it.  But what if I only want to wait a limited amount of time and then Abort?  Well, I could of course write that logic out by hand each time, but it seemed like a great extension method: 1: public static class ThreadExtensions 2: { 3: public static bool JoinOrAbort(this Thread thread, TimeSpan timeToWait) 4: { 5: bool isJoined = false; 6:  7: if (thread != null) 8: { 9: isJoined = thread.Join(timeToWait); 10:  11: if (!isJoined) 12: { 13: thread.Abort(); 14: } 15: } 16: return isJoined; 17: } 18: } 19:  When I look at this code, I can immediately see things that jump out at me as reasons why this code is very reusable.  Some of them are standard OO principles, and some are kind-of home grown litmus tests: Single Responsibility Principle (SRP) – The only reason this extension method need change is if the Thread class itself changes (one responsibility). Stable Dependencies Principle (SDP) – This method only depends on classes that are more stable than it is (System.Threading.Thread), and in itself is very stable, hence other classes may safely depend on it. It is also not dependent on any business domain, and thus isn't subject to changes as the business itself changes. Open-Closed Principle (OCP) – This class is inherently closed to change. Small and Stable Problem Domain – This method only cares about System.Threading.Thread. All-or-None Usage – A user of a reusable class should want the functionality of that class, not parts of that functionality.  That’s not to say they most use every method, but they shouldn’t be using a method just to get half of its result. Cost of Reuse vs. Cost to Recreate – since this class is highly stable and minimally complex, we can offer it up for reuse very cheaply by promoting it as “ready-to-go” and already unit tested (important!) and available through a standard release cycle (very important!). Okay, all seems good there, now lets look at an entity and DAO.  I don’t know about you all, but there have been times I’ve been in organizations that get the grand idea that all DAOs and entities should be standardized and shared.  While this may work for small or static organizations, it’s near ludicrous for anything large or volatile. 1: namespace Shared.Entities 2: { 3: public class Account 4: { 5: public int Id { get; set; } 6:  7: public string Name { get; set; } 8:  9: public Address HomeAddress { get; set; } 10:  11: public int Age { get; set;} 12:  13: public DateTime LastUsed { get; set; } 14:  15: // etc, etc, etc... 16: } 17: } 18:  19: ... 20:  21: namespace Shared.DataAccess 22: { 23: public class AccountDao 24: { 25: public Account FindAccount(int id) 26: { 27: // dao logic to query and return account 28: } 29:  30: ... 31:  32: } 33: } Now to be fair, I’m not saying there doesn’t exist an organization where some entites may be extremely static and unchanging.  But at best such entities and DAOs will be problematic cases of reuse.  Let’s examine those same tests: Single Responsibility Principle (SRP) – The reasons to change for these classes will be strongly dependent on what the definition of the account is which can change over time and may have multiple influences depending on the number of systems an account can cover. Stable Dependencies Principle (SDP) – This method depends on the data model beneath itself which also is largely dependent on the business definition of an account which can be very inherently unstable. Open-Closed Principle (OCP) – This class is not really closed for modification.  Every time the account definition may change, you’d need to modify this class. Small and Stable Problem Domain – The definition of an account is inherently unstable and in fact may be very large.  What if you are designing a system that aggregates account information from several sources? All-or-None Usage – What if your view of the account encompasses data from 3 different sources but you only care about one of those sources or one piece of data?  Should you have to take the hit of looking up all the other data?  On the other hand, should you have ten different methods returning portions of data in chunks people tend to ask for?  Neither is really a great solution. Cost of Reuse vs. Cost to Recreate – DAOs are really trivial to rewrite, and unless your definition of an account is EXTREMELY stable, the cost to promote, support, and release a reusable account entity and DAO are usually far higher than the cost to recreate as needed. It’s no accident that my case for reuse was a utility class and my case for non-reuse was an entity/DAO.  In general, the smaller and more stable an abstraction is, the higher its level of reuse.  When I became the lead of the Shared Components Committee at my workplace, one of the original goals we looked at satisfying was to find (or create), version, release, and promote a shared library of common utility classes, frameworks, and data access objects.  Now, of course, many of you will point to nHibernate and Entity for the latter, but we were looking at larger, macro collections of data that span multiple data sources of varying types (databases, web services, etc). As we got deeper and deeper in the details of how to manage and release these items, it quickly became apparent that while the case for reuse was typically a slam dunk for utilities and frameworks, the data access objects just didn’t “smell” right.  We ended up having session after session of design meetings to try and find the right way to share these data access components. When someone asked me why it was taking so long to iron out the shared entities, my response was quite simple, “Reuse is hard...”  And that’s when I realized, that while reuse is an awesome goal and we should strive to make code maintainable, often times you end up creating far more work for yourself than necessary by trying to force code to be reusable that inherently isn’t. Think about classes the times you’ve worked in a company where in the design session people fight over the best way to implement a class to make it maximally reusable, extensible, and any other buzzwordable.  Then think about how quickly that design became obsolete.  Many times I set out to do a project and think, “yes, this is the best design, I can extend it easily!” only to find out the business requirements change COMPLETELY in such a way that the design is rendered invalid.  Code, in general, tends to rust and age over time.  As such, writing reusable code can often be difficult and many times ends up being a futile exercise and worse yet, sometimes makes the code harder to maintain because it obfuscates the design in the name of extensibility or reusability. So what do I think are reusable components? Generic Utility classes – these tend to be small classes that assist in a task and have no business context whatsoever. Implementation Abstraction Frameworks – home-grown frameworks that try to isolate changes to third party products you may be depending on (like writing a messaging abstraction layer for publishing/subscribing that is independent of whether you use JMS, MSMQ, etc). Simplification and Uniformity Frameworks – To some extent this is similar to an abstraction framework, but there may be one chosen provider but a development shop mandate to perform certain complex items in a certain way.  Or, perhaps to simplify and dumb-down a complex task for the average developer (such as implementing a particular development-shop’s method of encryption). And what are less reusable? Application and Business Layers – tend to fluctuate a lot as requirements change and new features are added, so tend to be an unstable dependency.  May be reused across applications but also very volatile. Entities and Data Access Layers – these tend to be tuned to the scope of the application, so reusing them can be hard unless the abstract is very stable. So what’s the big lesson?  Reuse is hard.  In fact it’s damn hard.  And much of the time I’m not convinced we should focus too hard on it. If you’re designing a utility or framework, then by all means design it for reuse.  But you most also really set down a good versioning, release, and documentation process to maximize your chances.  For anything else, design it to be maintainable and extendable, but don’t waste the effort on reusability for something that most likely will be obsolete in a year or two anyway.

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  • Five C# Code Snippets

    A snippet is a small section of text or source code that can be inserted into the code of a program. Snippets provide an easy way to implement commonly used code or functions into a larger section of code. Instead of rewriting the same code over and over again, a programmer can save the code [...] Related posts:How To Obtain Environment Details With .NET 3.5 How-to: Easily Send Emails With .NET Understanding SMTP Status Codes ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Does a prose to code compiler exist?

    - by Raynos
    I have seen some horrible code in my time including people virtually duplicating the code in comments // add 4 to x x+=4; // for each i in 0 to 9 for (int i = 0; i < 10; i++) { // multiply x by i x *= i; } Taking this concept further, I'm curious whether prose to code compilers exist. Is there a valid use case for English prose to code? Do compilers exist that do this? The distinction between this and auto generated code, is that auto generated code is generally always a subset of a project. Can we have complete projects auto generated from english prose? I realise that this might overlap with the concept of declarative languages.

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  • why not use unmanaged safe code in c#

    - by user613326
    There is an option in c# to execute code unchecked. It's generally not advised to do so, as managed code is much safer and it overcomes a lot of problems. However I am wondering, if you're sure your code won't cause errors, and you know how to handle memory then why (if you like fast code) follow the general advice? I am wondering this since I wrote a program for a video camera, which required some extremely fast bitmap manipulation. I made some fast graphical algorithms myself, and they work excellent on the bitmaps using unmanaged code. Now I wonder in general, if you're sure you don't have memory leaks, or risks of crashes, why not use unmanaged code more often ? PS my background: I kinda rolled into this programming world and I work alone (I do so for a few years) and so I hope this software design question isn't that strange. I don't really have other people out there like a teacher to ask such things.

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  • Releasing a project under GPL v2 or later without the source code of libraries

    - by Luciano Silveira
    I wrote a system in Java that I want to release under the terms of GPL v2 or later. I've used Apache Maven to deal with all the dependencies of the system, so I don't have the source code of any of the libraries used. I've already checked, all the libraries were released under GPL-compatible licenses (Apache v2, 3-clause BSD, MIT, LGPL v2 and v2.1). I have 3 questions about this scenario: 1) Can I release a package with only the binaries of code I wrote, not including the libraries, and distribute only the source code I wrote? 2) Can I release a package with all the binaries, including the libraries, and distribute only the source code I wrote? 3) Can I release a package with all the binaries, including the libraries, and distribute only the source code I wrote plus the source code of the libraries licensed under the LGPL license?

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  • How do you handle measuring Code Coverage in JavaScript

    - by Dancrumb
    In order to measure Code Coverage for JavaScript unit tests, one needs to instrument the code, run the tests and then perform post-processing. My concern is that, as a result, you are unit testing code that will never be run in production. Since JavaScript isn't compiled, what you test should be precisely what you execute. So here's my question, how do you handle this? One thought I had was to run Unit Testing on the production code and use that for my pass fail. I would then create a shadow of my production code, with instrumentation and run my unit tests again; this would give me my code coverage stats. Has anyone come across a method that is a little more graceful than this?

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  • What is testable code?

    - by Michael Freidgeim
    We are improving quality of code and trying to develop more unit tests. The question that developers asked  was  "How to make code testable ?"  From http://openmymind.net/2010/8/17/Write-testable-code-even-if-you-dont-write-tests/ First and foremost, its loosely coupled, taking advantage of dependency injection (and auto-wiring), composition and interface-programming. Testable code is also readable - meaning it leverages single responsibility principle and Liskov substitution principle.A few practical suggestions are listed in http://misko.hevery.com/code-reviewers-guide/More recommendations are in http://googletesting.blogspot.com/2008/08/by-miko-hevery-so-you-decided-to.htmlIt is slightly too theoretical - " the trick is translating these abstract concepts into concrete decisions in your code."

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  • Un espace de revue de code a ouvert ses portes dans la rubrique Qt, venez participer

    Bonjour à tous, Suite à une certaine demande après le défi, il nous a semblé utile d'organiser quelque peu une revue de code Qt. En deux mots, de quoi s'agit-il ? Des développeurs plus expérimentés lisent le code d'autres développeurs et le commentent : ceci aurait été mieux d'une autre manière, ce commentaire ne veut rien dire, ce pavé de code devrait être réécrit, etc. Des remarques sur le fond et la forme du code, sur son organisation, les patrons de conception utilisés, les concepts inhérents à Qt et/ou au C++ mal compris ou mal appliqués, etc. L'objectif est de confronter les opinions sur un code pour qu'au final tout le monde y gagne. Pour l'organisation, autant faire simple : pour ceux qui souhaitent une revue de code, créez un ...

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  • Top X tips to code & debug efficiently [closed]

    - by user1510230
    I'm starting a big Java project and I wanted to have some advices that could benefit us all. What are the X (X could be 5 / 10 / ... or even 100 :) most important tips to code and debug efficiently in general (and in particular with java / javascript) ? I'll start with some basic ones : Use functions everytime a portion of code is used more than twice. Try not to code features with more than 15 lines of code in one shot. Rather write 5 lines of code then check if they work correctly then write 5 more... and so on start with the outcome of the function and then code it backwards (bottom-top approach) ... Thanks everybody

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  • Where to find GUI code

    - by muffinz
    I've been rummaging through Unity's source code (Shell Interface) and I was a little curious about something; where in the code are you supposed to find positional code? I'll clarify a bit with some examples. How do you find in the code what tells the Launcher to sit on the left side of the screen? Where in the code does it tell the "Session" button on the panel (top) to sit at the very right of the screen? I guess my real question is how do I find this out for myself? I've looked through a big portion of the source code and can't find anything related to the actual position of these items, only their sub-items like text-align. Any guidance on this would be much appreciated.

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  • PL/SQL pre-compile and Code Quality checks in an automatted build environment?

    - by Lars Corneliussen
    We build software using Hudson and Maven. We have C#, java and last, but not least PL/SQL sources (sprocs, packages, DDL, crud) For C# and Java we do unit tests and code analysis, but we don't really know the health of our PL/SQL sources before we actually publish them to the target database. Requirements There are a couple of things we wan't to test in the following priority: Are the sources valid, hence "compilable"? For packages, with respect to a certain database, would they compile? Code Quality: Do we have code flaws like duplicates, too complex methods or other violations to a defined set of rules? Also, the tool must run head-less (commandline, ant, ...) we wan't to do analysis on a partial code base (changed sources only) Tools We did a little research and found the following tools that could potencially help: Cast Application Intelligence Platform (AIP): Seems to be a server that grasps information about "anything". Couldn't find a console version that would export in readable format. Toad for Oracle: The Professional version is said to include something called Xpert validates a set of rules against a code base. Sonar + PL/SQL-Plugin: Uses Toad for Oracle to display code-health the sonar-way. This is for browsing the current state of the code base. Semantic Designs DMSToolkit: Quite general analysis of source code base. Commandline available? Semantic Designs Clones Detector: Detects clones. But also via command line? Fortify Source Code Analyzer: Seems to be focussed on security issues. But maybe it is extensible? more... So far, Toad for Oracle together with Sonar seems to be an elegant solution. But may be we are missing something here? Any ideas? Other products? Experiences? Related Questions on SO: http://stackoverflow.com/questions/531430/any-static-code-analysis-tools-for-stored-procedures http://stackoverflow.com/questions/839707/any-code-quality-tool-for-pl-sql http://stackoverflow.com/questions/956104/is-there-a-static-analysis-tool-for-python-ruby-sql-cobol-perl-and-pl-sql

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  • how to exit recursive math formula and still get an answer

    - by calccrypto
    i wrote this python code, which from wolfram alpha says that its supposed to return the factorial of any positive value (i probably messed up somewhere), integer or not: from math import * def double_factorial(n): if int(n) == n: n = int(n) if [0,1].__contains__(n): return 1 a = (n&1) + 2 b = 1 while a<=n: b*=a a+= 2 return float(b) else: return factorials(n/2) * 2**(n/2) *(pi/2)**(.25 *(-1+cos(n * pi))) def factorials(n): return pi**(.5 * sin(n*pi)**2) * 2**(-n + .25 * (-1 + cos(2*n*pi))) * double_factorial(2*n) the problem is , say i input pi to 6 decimal places. 2*n will not become a float with 0 as its decimals any time soon, so the equation turns out to be pi**(.5 * sin(n*pi)**2) * 2**(-n + .25 * (-1 + cos(2*n*pi))) * double_factorial(loop(loop(loop(...))))) how would i stop the recursion and still get the answer? ive had suggestions to add an index to the definitions or something, but the problem is, if the code stops when it reaches an index, there is still no answer to put back into the previous "nests" or whatever you call them

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