ThreadLocalスレッド範囲内の共有変数
3318 ワード
データベース接続とstrut 2の要求ごとにThreadLocalを使用
import java.util.Random;
public class ThreadLocalTest {
private static ThreadLocal<Integer> x = new ThreadLocal<Integer>();
/*
* private static ThreadLocal<MyThreadScopeData> myThreadScoprData = new
* ThreadLocal<MyThreadScopeData>();
*/
public static void main(String[] args) {
for (int i = 0; i < 2; i++) {
new Thread(new Runnable() {
@Override
public void run() {
int data = new Random().nextInt();
x.set(data);
System.out.println(Thread.currentThread().getName()
+ " has put data:" + data);
/*
* MyThreadScopeData myData = new MyThreadScopeData();
* myData.setName("yuanhai" + data); myData.setAge("29");
* myThreadScoprData.set(myData);
*/
MyThreadScopeData.getThreadInstance().setName(
"yuanhai" + data);
MyThreadScopeData.getThreadInstance().setAge("29");
new A().get();
new B().get();
}
}).start();
}
}
static class A {
public void get() {
int data = x.get();
System.out.println("A from " + Thread.currentThread().getName()
+ " get data :" + data);
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();
System.out
.println("B from " + Thread.currentThread().getName()
+ " getMyData :" + myData.getName() + ","
+ myData.getAge());
}
}
}
//
class MyThreadScopeData {
private MyThreadScopeData() {
}
public static/* synchronized */MyThreadScopeData getThreadInstance() {
MyThreadScopeData instance = map.get();
if (instance == null) {
instance = new MyThreadScopeData();
map.set(instance);
}
return instance;
}
// private static MyThreadScopeData instance = null;// new MyThreadScopeData();
private String name;
private String age;
private static ThreadLocal<MyThreadScopeData> map = new ThreadLocal<MyThreadScopeData>();
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}