java threadlocal

Threadlocal ------- Each thread has only one t objectKey Methods:T get (); // return the value in the current thread copy of the local variable of this threadT initialvalue (); // return the "Initial Value" of the current thread of the local variable of this thread"Void remove (); // remove the value of the current thread of the local variable of this threadVoid set (T value); // set the value in the current thread copy of the local variable of this t

Threadlocal objects are typically used to prevent the sharing of mutable single-instance variables or global variables. PackageCom.lxc.tet;ImportJava.util.Map;ImportJava.util.concurrent.ConcurrentHashMap; Public classMythreadlocal { PrivatemapNewConcurrenthashmap(); protectedT InitialValue () {return NULL; } Public voidset (T value) {map.put (Thread.CurrentThread (), value); } Publict get () {t result=NULL; Result=Map.get (Thread.Cu

Package thread; Import Java.util.Random; The public class Threadlocalsharedatademo {/** * threadlocal class and application techniques encapsulate the shared data within a thread, encapsulate it in a separate data class, and provide a set fetch method * The class is instantiated to provide an instance Object is an object that is already encapsulated within the current thread scope * * @param args */public static void main (string[] args) {for (int i

1. First, let us design this structure, how we design. Because threadlocal functionally, each thread has a separate copy, which is independent of each other, in its own stack. If we were to design it, we'd have to think of a relationship with each thread. Then each thread is associated with a specific value, which makes it easy for us to think of the HASHMAP data structure. Take thread as key, and value as we want. In multi-threading, we might think o

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 Threadlocal,linkedblockingqueue, thread pool Get database conne

One*classLooperthreadextendsThread {* PublicHandler Mhandler; * * Public voidrun () {*Looper.prepare (); * * Mhandler =NewHandler () {* Public voidhandlemessage (Message msg) {*//process incoming Messages here* } * }; * *Looper.loop (); * } * }The execution process for the above code is1.looper.prepare () will execute Sthreadlocal.set (new Looper (quitallowed))2. And new Looper (quitallowed) will execute,(1) Mqueue = new MessageQueue (quitallowed);(2) Mthread = Th

(); } } //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 thread Static classb{ Public voidget () {System.out.println (Thread.CurrentThread (). GetName ()+ "has a num---B:" +Map.get (Thread.CurrentThread ())); } }}Results Analysis:Threadlocal sha

=(servletrequestattributes) RA; HttpServletRequest Request=sra.getrequest (); String URL=Request.getrequesturl (). toString (); String Method=Request.getmethod (); String URI=Request.getrequesturi (); String queryString=request.getquerystring (); Logger.info ("request Start, url: {}, method: {}, Uri: {}, params: {}", url, method, Uri, queryString); //the value of result is the return value of the intercepted methodObject result =pjp.proceed (); Logger.info ("end of request, URL: {}, Response: {}

() { + 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 - */ - Public Static voidrelease () { - Try { A Tl.get (). Close (); +Tl.remove ();//Map{tl:conn} the}Catch(SQLException e

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 (

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

ServletexceptIon, IOException {/* * 1. Encapsulates the form data into the customer object, it has only four attributes (CNAME, gender, cellphone, email) * It is a condition * 2. Use the customer to invoke the service method, Get listDAO layer (persistence layer)/** * Persistence Layer * * @author CXF * */public class Customerdao {private Queryrunner QR = new Txqueryrunner ();/** * Add Customer * * @pa Ram C */public void Add (Customer c) {try {String sql = "INSERT into T_customer values (?,?,?

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["

) { - if(ds = =NULL){ theDS =NewDubblesingleton (); - } - } - } + returnds; - } + A Public Static voidMain (string[] args) { atThread T1 =NewThread (NewRunnable () { - @Override - Public voidrun () { - System.out.println (Dubblesingleton.getds (). Hashcode ()); - } -}, "T1"); inThread t2 =NewThread (NewRunnable () { - @Override to Public voidrun () { + System.out.println (Dubblesinglet

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 =

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

= 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 (); System.out.println ("B from" + Thread.CurrentThread (). GetName () + "Getmydata:" + mydata.getname () + ","

Java Multithreading Basics@ (blog post) [Java] Java Multithreading Basics An overview A basic content 1 Basic concepts of threading 2JAVA Thread Basics 3 2 ways to create a new thread The state of the second process and its change Six states of 1Java threads 2 changes in t

, causing other threads to access this thread variable, which, if used improperly, can lead to inefficient systems, for example, Assuming that we have access to the system in the threadlocal to add variables not to update and delete, then this saved object becomes an incremental container object, if the traffic is huge, will lead to low JVM memory and frequently trigger the GC,GC at work will replicate data, Frequent triggering of a GC can adversely a