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：
| 类名 | 说明 |
|---|---|
| Main.java | 方法的总入口 |
| LogInterface.java | 日志接口 |
| ThreadSpecialLog.java | 每个线程分配特有存储空间的类 |
| ClientThread.java | 客户端 |
| Log.java | 创建日志的类 |
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();
}
}
@Override
public void printLog(String log) {
printWriter.println(log);
}
@Override
public 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);
}
@Override
public 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
