com.sun.grizzly.util.FutureImpl Maven / Gradle / Ivy
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package com.sun.grizzly.util;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* Default {@link Future} implementation
*
* @author Alexey Stashok
*/
public class FutureImpl implements Future {
private final Object sync;
private boolean isDone;
private boolean isCancelled;
private Throwable failure;
protected R result;
public FutureImpl() {
this(new Object());
}
public FutureImpl(Object sync) {
this.sync = sync;
}
public R getResult() {
synchronized(sync) {
return result;
}
}
public void setResult(R result) {
synchronized(sync) {
this.result = result;
notifyHaveResult();
}
}
public boolean cancel(boolean mayInterruptIfRunning) {
synchronized(sync) {
isCancelled = true;
notifyHaveResult();
return true;
}
}
public boolean isCancelled() {
synchronized(sync) {
return isCancelled;
}
}
public boolean isDone() {
synchronized(sync) {
return isDone;
}
}
public R get() throws InterruptedException, ExecutionException {
synchronized (sync) {
for (;;) {
if (isDone) {
if (isCancelled) {
throw new CancellationException();
} else if (failure != null) {
throw new ExecutionException(failure);
} else if (result != null) {
return result;
}
}
sync.wait();
}
}
}
public R get(long timeout, TimeUnit unit) throws
InterruptedException, ExecutionException, TimeoutException {
long startTime = System.currentTimeMillis();
long timeoutMillis = TimeUnit.MILLISECONDS.convert(timeout, unit);
synchronized (sync) {
for (;;) {
if (isDone) {
if (isCancelled) {
throw new CancellationException();
} else if (failure != null) {
throw new ExecutionException(failure);
} else if (result != null) {
return result;
}
} else if (System.currentTimeMillis() - startTime > timeoutMillis) {
throw new TimeoutException();
}
sync.wait(timeoutMillis);
}
}
}
public void setException(Throwable failure) {
synchronized(sync) {
this.failure = failure;
notifyHaveResult();
}
}
protected void notifyHaveResult() {
isDone = true;
sync.notifyAll();
}
}