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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package nginx.unit.websocket;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicReference;
import javax.websocket.SendHandler;
import javax.websocket.SendResult;
import org.apache.tomcat.util.res.StringManager;
/**
* Converts a Future to a SendHandler.
*/
class FutureToSendHandler implements Future<Void>, SendHandler {
private static final StringManager sm = StringManager.getManager(FutureToSendHandler.class);
private final CountDownLatch latch = new CountDownLatch(1);
private final WsSession wsSession;
private volatile AtomicReference<SendResult> result = new AtomicReference<>(null);
public FutureToSendHandler(WsSession wsSession) {
this.wsSession = wsSession;
}
// --------------------------------------------------------- SendHandler
@Override
public void onResult(SendResult result) {
this.result.compareAndSet(null, result);
latch.countDown();
}
// -------------------------------------------------------------- Future
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
// Cancelling the task is not supported
return false;
}
@Override
public boolean isCancelled() {
// Cancelling the task is not supported
return false;
}
@Override
public boolean isDone() {
return latch.getCount() == 0;
}
@Override
public Void get() throws InterruptedException,
ExecutionException {
try {
wsSession.registerFuture(this);
latch.await();
} finally {
wsSession.unregisterFuture(this);
}
if (result.get().getException() != null) {
throw new ExecutionException(result.get().getException());
}
return null;
}
@Override
public Void get(long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException,
TimeoutException {
boolean retval = false;
try {
wsSession.registerFuture(this);
retval = latch.await(timeout, unit);
} finally {
wsSession.unregisterFuture(this);
}
if (retval == false) {
throw new TimeoutException(sm.getString("futureToSendHandler.timeout",
Long.valueOf(timeout), unit.toString().toLowerCase()));
}
if (result.get().getException() != null) {
throw new ExecutionException(result.get().getException());
}
return null;
}
}
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