Multithreaded Programming Learning (THREAD-SOECIFIC) storage pattern

thread-specific-storage[Thread Safety box]

One: Participants in the thread-specific storage
---> Logging thread (clientthread)
---> Responsible for getting different thread logging (log)
---> Class (Tslog) responsible for writing logs to a file



II: thread-specific storage mode when to use
---> When each thread must have its own unique information, you can put that information in the thread safe threadlocal


Three: thread-specific Storage thinking
---> Place line thread where information is available
(1) out-of-Thread---> Thread safe deposit box threadlocal
(2) Line range---thread body local variables

---> Multithreading common data with shared mutex
---> Shared mutexes degrade performance, so try to narrow the scope of the shared mutex as much as possible
---> Threading performance is the implementation of thread code

Four step instructions
--->

Behavior class for logging

1  PackageCom.yeepay.sxf.thread11;2 3 ImportJava.io.FileWriter;4 ImportJava.io.PrintWriter;5 6 /**7 * Log Class8  * @authorSXF9  *Ten  */ One  Public classTslog { A     //Write Log Object -     PrivatePrintWriter printwriter=NULL; -      the     //Constructors -      PublicTslog (String fileName) { -         Try { -Printwriter=NewPrintWriter (NewFileWriter (FileName)); +}Catch(Exception e) { -             //TODO auto-generated Catch block + e.printstacktrace (); A         } at     } -      -     //Add a log -      Public voidaddlogstr (String logstr) { - Printwriter.print (LOGSTR); -     } in      -     //turn off the output stream to      Public voidCloselog () { + printwriter.close (); -     } the}

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Objects that represent logging for different threads

1  PackageCom.yeepay.sxf.thread11;2 3 4 /**5 * Different thread distribution of different log instances6  * @authorSXF7  *8  */9  Public classLog {Ten     //the thread's collection of safe boxes One     Private Static FinalThreadLocal tslongconteint=NewThreadLocal (); A  -      Public Static voidprintlogstr (String logstr) { -Tslog log=Gettslog (); the log.addlogstr (LOGSTR); -     } -     //gets the current thread's safe deposit box -      Public StaticTslog Gettslog () { +         //take the Tslog from the thread vault as the front-line. -Tslog lg=(Tslog) tslongconteint.get (); +         //If it does not exist, create a new Tslog A         if(lg==NULL){ atlg=NewTslog ("/usr/war/" +thread.currentthread (). GetName () + "-log.txt"); - Tslongconteint.set (LG); -         } -         returnLG; -     } -     //Close the stream of the log object in      Public Static voidClosetslog () { - Gettslog (). Closelog (); to     } +}

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Thread class for logging

1  PackageCom.yeepay.sxf.thread11;2 /**3 * Log thread is logged4  * @authorSXF5  *6  */7  Public classClientthreaadImplementsrunnable{8     9      PublicClientthreaad () {Ten  One     } A      -      - @Override the      Public voidrun () { -          for(inti = 0; I <10; i++) { -Log.printlogstr (Thread.CurrentThread (). GetName () +i); -System.out.println ("Clientthreaad.run () ==>" +thread.currentthread (). GetName () +i); +         } - Log.closetslog (); +     } A      at  -}

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Test class

1  PackageCom.yeepay.sxf.thread11;2 /**3 * Test Class4  * @authorSXF5  *6  */7  Public classTest {8     9     Ten      Public Static voidMain (string[] args) { One         //Open three threads, generate 3 files, three threads record their own logs A         NewThread (NewClientthreaad ()). Start (); -         NewThread (NewClientthreaad ()). Start (); -         NewThread (NewClientthreaad ()). Start (); the     } -  -}

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Multithreaded Programming Learning (THREAD-SOECIFIC) storage pattern