threadlocal

); System.out.println (Thread.CurrentThread (). GetName ()+ "has a put num:" +num); //A, b objects Get values by CurrentThread NewA (). get (); NewB (). get (); }}). Start (); } } //A object outputs the data for NUM in the current thread Static classa{ Public voidget () {System.out.println (Thread.CurrentThread (). GetName ()+ "has a num---A:" +Map.get (Thread.CurrentThread ())); } } //the B object outputs the data for NUM in the current threa

@Configuration Public classLogaspect {Private StaticFinal Logger Logger = Loggerfactory.getlogger (logaspect.class);//private static final SimpleDateFormat DataFormat = new SimpleDateFormat ("Yyyy-mm-dd ' T ' HH:mm:ss. SSS "); //Defining tangency Pointcut@Pointcut ("Execution (* com.iwhere.scrapy.controller.*controller.* (..))") Public voidExcudeservice () {} @Around ("Excudeservice ()") PublicObject doaround (Proceedingjoinpoint pjp) throws Throwable {Long startTime=System.curren

} * } $ /**Panax Notoginseng * @returnrolling back - */ the Public Static voidRollbacktran () { + Try { A tl.get (). rollback (); the}Catch(SQLException e) { + e.printstacktrace (); - } $ } $ /** - * @returnExecution - */ the Public Static voidCommittran () { - Try {Wuyi Tl.get (). commit (); the}Catch(SQLException e) { - e.printstacktrace (); Wu } - } About /** $ * @returnClose - */ - P

Content from, Zhang Xiaoxiang teacher's Zhang Xiaoxiang-java multi-threading and concurrent Library Advanced Application Video tutorialPackage Com.lipeng;public class MyThreadLocalTest2 {private final static mythreadlocalJava Multi-Threading and concurrency Applications-(5)-How to use the Threadlocal class gracefully

Import Java.util.Random;public class ThreadDemo3 {public static void Main (string[] args) {for (int i=0;iNew Thread (New Runnable () {@Overridepublic void Run () {int data =new Random (). Nextint ();Data1.getintance (). SetName ("FDF" +data);Data1.getintance (). setage (data);System.out.println (Thread.CurrentThread (). GetName () + "data:" + data);System.out.println (Thread.CurrentThread (). GetName () + "Hashcode" +data1.getintance (). GetClass (). Hashcode ());New A (). get ();New B (). get (

the volatile modifier, all operations on this variable are atomic, and when the value of the variable is determined by its own previous decision, such as N=n+1, n++, the volatile keyword will fail, The operation of the variable is atomic if it is independent of its previous value, such as n = m + 1, which is the original level. So in the use of volatile key must be cautious, if they are not sure, you can use synchronized to replace volatile. To solve this problem, there are two options:1, the t

, params) = = 1; } /*** Delete Entity*/ Public StaticBooleanDeleteentity (classLongID) {String SQL= "Delete from" + gettablename (entityclass) + "where id=?"; returnExecuteupdate (sql, id) = = 1; } /*** Get table names by class name*/ Private StaticString Gettablename (classEntityclass) { returnEntityclass.getsimplename (); } /*** Execute SQL file*/ Public Static voidexecutesqlfile (String filePath) {InputStream is=Thread.CurrentThread (). Getcontextclassloader (). get

the service method to complete the modification * 3. Save the success message to request domain * 4. Forward to msg.jsp display success Information *///has encapsulated the CID into the Customer object in customer c = Commonutils.tobean (Request.getparametermap (), Customer.class) ; Customerservice.edit (c); Request.setattribute ("msg", "Congratulations, edit Customer success!") "); return" f:/msg.jsp ";} Public String Query (httpservletrequest request, httpservletresponse response) throws Serv

private static threadlocalProtected synchronized String InitialValue () {return null;}};public static String Getnextuuid () {try {if (uuid.get () = null)return Uuid.get ();Uuid.set (Uuidutil.replacestring (Uuidutil.getuuid (), "-", '-'));return Uuid.get ();} catch (Exception e) {E.printstacktrace ();}return null;}Test threadPackage com.ushi.montor.test;Import Com.ushi.montor.util.UUIDUtil;public class TestClient extends Thread {public void Run () {for (int i = 0; i System.out.println ("thread["

(sessionfactory==NULL) {rbuildsessionfactory (); }Else{Session=sessionfactory.opensession (); } //session = (sessionfactory! = null)? Sessionfactory.opensession (): null;} threadlocal.set (session); } Catch(Exception e) {//Todo:handle Exception } returnsession; } Public Static voidrbuildsessionfactory () {Try{configuration.configure (configfile); Sessionfactory=configuration.buildsessionfactory (); } Catch(Exception e) {System.err.println ("%%%% Error

time for initializing objects ...9Thread.Sleep (3000);Ten}Catch(interruptedexception e) { One e.printstacktrace (); A } - synchronized(Dubblesingleton.class) { - if(ds = =NULL){ theDS =NewDubblesingleton (); - } - } - } + returnds; - } + A Public Static voidMain (string[] args) { atThread T1 =NewThread (NewRunnable () { - @Override - Public voidrun () { - System.out.println (Dubblesing

The Threadlocal object helps us to manage the objects within the thread, ensuring that the objects are isolated from each other.The pit we met today is like this:Index01.html page load will be sent once a request, and then click on the attachment upload will send an upload request B, upload success will send a download request C,Where a request passes through the Interceptor01 Interceptor, the Interceptor01 internally passes the Module_name parameter

emulate the Threadlocal class implementation : Thread-scoped shared variables, each thread can only access his own, and cannot access other threads. PackageCom.ljq.test.thread;ImportJava.util.HashMap;ImportJava.util.Map;ImportJava.util.Random;/*** thread-wide Shared variables * * Three modules shared data, main thread module and AB module *@authorAdministrator **/ Public classThreadscopesharedata {//prepare the shared data Private Static intdata =

Oom?Java.lang.OutOfMemoryError:java head space heap memory overflowJava.lang.OutOfMemoryError:Permgen Space Java Eternal Overflow, that is, methods to overflow, generally because of the emergence of a large number of classes and JSPs, or the use of Cglib reflection mechanism,This can be resolved by changing the size of the method area and modifying it in the form of a similar-xx:permsize=64m-xx:maxpermsize=256m. In addition, too many constants, especially strings, can cause the method area to ov

In multi-threading, locking is required for operations that share data in common.However, for local variables , each thread is independent of each other.If the thread t want to F1 the function in the local variable V1 to the function F2, F2 again want to put this variable to F3, a layer of a layer of the more cumbersome to pass.Name the object returned by Python's threading.local () tl, place the TL at the Global location, and bind the properties to the TL in each function.TL can be regarded as

(). GetName () + "Getmydata:" + mydata.getname () + "," + Mydata.getage ()); Mythreadscopedata myData = Mythreadscopedata.getthreadinstance (); System.out.println ("A from" + Thread.CurrentThread (). GetName () + "Getmydata:" + mydata.getname () + "," + Mydata.getage ()); } } Static Class b{ public void get () { int data = X.get (); System.out.println ("B from" + Thread.CurrentThread (). GetName () + "Get Data:" + data); Mythreadscopedata myData = Mythreadscopedata.getthreadinstance (); Syste

Tags:desjavaio data for artarcti Package Com.ctl.util;import Java.sql.connection;import Java.sql.drivermanager;import java.sql.sqlexception;import Java.util.random;import Java.util.concurrent.linkedblockingqueue;import Java.util.concurrent.timeunit;import Com.ctl.util.configutils;import Com.ctl.util.logutil;public class Threadlocalblockingqueueutils {private static threadlocal

Database connection and STRUT2 for each request threadlocalImport java.util.random;public class threadlocaltest {    private  static ThreadLocal x = new ThreadLocal (); 

Import java. util. collections;Import java. util. hashmap;Import java. util. Map; Public class mythreadlocal2 { Private Map map = collections. synchronizedmap (New hashmap ());T initvalue (){Return NULL;}Public t getvalue (){Thread thread =

package com.ctl.util;import java.sql.connection;import Java.sql.DriverManager; Import Java.sql.sqlexception;import Java.util.random;import Java.util.concurrent.linkedblockingqueue;import Java.util.concurrent.timeunit;import