package com.srdsoft.test;
//被观察的对象，定义一个虚拟类，没有实现Runnable run方法，所以用 abstract
public abstract class ObservableRunnable implements Runnable
{
final protected
LifeCycleListener listener;
public
ObservableRunnable(final LifeCycleListener listener) {
this.listener = listener;
}
protected void
notifyChange(final RunnableEvent event) {
listener.onEvent(event);
}
public enum
RunnableState {
RUNNING, ERROR, DONE
}
//中间传递事件和数据的对象.
public static class
RunnableEvent {
private final RunnableState state;
private final Thread thread;
private final Throwable cause;
public RunnableEvent(RunnableState state, Thread
thread, Throwable cause) {
this.state
= state;
this.thread = thread;
this.cause
= cause;
}
public RunnableState getState() {
return
state;
}
public Thread getThread() {
return
thread;
}
public Throwable getCause() {
return
cause;
}
}
}
package com.srdsoft.test;
//观察者接口
public interface LifeCycleListener {
void
onEvent(ObservableRunnable.RunnableEvent event);
}
package com.srdsoft.test;
import java.util.List;
//观察者
public class ThreadLifeCycleObserver implements
LifeCycleListener {
private final Object
LOCK = new Object();
public void
concurrentQuery(List《String》 ids) {
if (ids == null || ids.isEmpty())
return;
ids.stream().forEach(id -》 new Thread(new
ObservableRunnable(this) {
@Override
public
void run() {
try {
notifyChange(new
RunnableEvent(RunnableState.RUNNING, Thread.currentThread(),
null));
System.out.println("query for the id " +
id);
Thread.sleep(1000L);
notifyChange(new
RunnableEvent(RunnableState.DONE, Thread.currentThread(),
null));
} catch (Exception e) {
notifyChange(new
RunnableEvent(RunnableState.ERROR, Thread.currentThread(),
e));
}
}
}, id).start());
}
@Override
public void
onEvent(ObservableRunnable.RunnableEvent event) {
synchronized (LOCK) {
System.out.println("The runnable [" + event.getThread().getName() +
"] data changed and state is [" + event.getState() + "]");
if
(event.getCause() != null) {
System.out.println("The
runnable [" + event.getThread().getName() + "] process
failed.");
event.getCause().printStackTrace();
}
}
}
}
package com.srdsoft.test;
import java.util.Arrays;
public class ThreadLifeCycleTest {
public static void
main(String[] args) {
new
ThreadLifeCycleObserver().concurrentQuery(Arrays.asList("1",
"2"));
}
}
