轻松学习多线程-12-Thread Special Storage 模式

目录

Thread Special Storage 模式

Thread Special Storage 模式是一种即使只有一个入口，也会为每一个线程分配特有的存储空间的模式。

实际案例

类信息概览：

定义

• LogInterface.java

package com.github.houbb.thread.learn.easy.learn.threadSpecialStorage;/*** 2018/2/4** @author houbinbin* @version 1.0* @since 1.7*/
public interface LogInterface {
    void printLog(String log);void closeLog();}

• ThreadSpecialLog.java

package com.github.houbb.thread.learn.easy.learn.threadSpecialStorage;import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;/*** 2018/2/4** @author houbinbin* @version 1.0* @since 1.7*/
public class ThreadSpecialLog implements LogInterface{
    private PrintWriter printWriter = null;public ThreadSpecialLog(final String fileName) {try {printWriter = new PrintWriter(new FileWriter(fileName));} catch (IOException e) {e.printStackTrace();}}@Overridepublic void printLog(String log) {printWriter.println(log);}@Overridepublic void closeLog() {printWriter.print("================= END OF LOG =================");printWriter.close();}}

• ClientThread.java

package com.github.houbb.thread.learn.easy.learn.threadSpecialStorage;/*** 2018/2/4** @author houbinbin* @version 1.0* @since 1.7*/
public class ClientThread extends Thread {
    public ClientThread(String threadName) {super(threadName);}@Overridepublic void run() {System.out.println("MAIN BEGIN...");for(int i = 0; i < 10; i++) {Log.printLog("log-"+i);}Log.closeLog();System.out.println("MAIN END...");}}

• Log.java

package com.github.houbb.thread.learn.easy.learn.threadSpecialStorage;/*** 2018/2/4** @author houbinbin* @version 1.0* @since 1.7*/
public class Log {
    private static final ThreadLocal<ThreadSpecialLog> tsLogCollection = new ThreadLocal<>();public static void printLog(String log) {getTsLog().printLog(log);}public static void closeLog() {getTsLog().closeLog();}private static LogInterface getTsLog() {ThreadSpecialLog threadSpecialLog = tsLogCollection.get();if(null == threadSpecialLog) {String fileName = Thread.currentThread().getName()+"-log.txt";threadSpecialLog = new ThreadSpecialLog(fileName);tsLogCollection.set(threadSpecialLog);return threadSpecialLog;}return threadSpecialLog;}}

测试

• Main.java

package com.github.houbb.thread.learn.easy.learn.threadSpecialStorage;/*** 2018/2/4** @author houbinbin* @version 1.0* @since 1.7*/
public class Main {
    public static void main(String[] args) {new ClientThread("One").start();new ClientThread("Two").start();new ClientThread("Three").start();}}

• 测试结果

MAIN BEGIN... MAIN BEGIN... MAIN BEGIN... MAIN END... MAIN END... MAIN END...

实现方式

UML & Code

UML

UML 图示如下

Code

代码地址

Thread Special Storage

系列导航

多线程系列导航