/**
* 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 org.apache.camel.component.routebox.seda;
import java.util.Collection;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.apache.camel.AsyncCallback;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangeTimedOutException;
import org.apache.camel.WaitForTaskToComplete;
import org.apache.camel.component.routebox.RouteboxProducer;
import org.apache.camel.impl.DefaultAsyncProducer;
import org.apache.camel.impl.SynchronizationAdapter;
import org.apache.camel.util.ExchangeHelper;
/**
* @version $Revision: 955924 $
*/
public class RouteboxSedaProducer extends DefaultAsyncProducer implements RouteboxProducer {
protected final Collection<Exchange> queue;
private final RouteboxSedaEndpoint endpoint;
private final WaitForTaskToComplete waitForTaskToComplete;
private final long timeout;
public RouteboxSedaProducer(RouteboxSedaEndpoint endpoint, BlockingQueue<Exchange> queue, WaitForTaskToComplete waitForTaskToComplete, long timeout) {
super(endpoint);
this.endpoint = endpoint;
this.queue = queue;
this.waitForTaskToComplete = waitForTaskToComplete;
this.timeout = timeout;
}
public boolean process(final Exchange exchange, final AsyncCallback callback) {
// use a new copy of the exchange to route async and handover the on completion to the new copy
// so its the new copy that performs the on completion callback when its done
Exchange copy = ExchangeHelper.createCorrelatedCopy(exchange, true);
// set a new from endpoint to be the seda queue
copy.setFromEndpoint(endpoint);
WaitForTaskToComplete wait = waitForTaskToComplete;
if (exchange.getProperty(Exchange.ASYNC_WAIT) != null) {
wait = exchange.getProperty(Exchange.ASYNC_WAIT, WaitForTaskToComplete.class);
}
if (wait == WaitForTaskToComplete.Always
|| (wait == WaitForTaskToComplete.IfReplyExpected && ExchangeHelper.isOutCapable(exchange))) {
// latch that waits until we are complete
final CountDownLatch latch = new CountDownLatch(1);
// we should wait for the reply so install a on completion so we know when its complete
copy.addOnCompletion(new SynchronizationAdapter() {
@Override
public void onDone(Exchange response) {
// check for timeout, which then already would have invoked the latch
if (latch.getCount() == 0) {
if (log.isTraceEnabled()) {
log.trace(this + ". Timeout occurred so response will be ignored: " + (response.hasOut() ? response.getOut() : response.getIn()));
}
return;
} else {
if (log.isTraceEnabled()) {
log.trace(this + " with response: " + (response.hasOut() ? response.getOut() : response.getIn()));
}
try {
ExchangeHelper.copyResults(exchange, response);
} finally {
// always ensure latch is triggered
latch.countDown();
}
}
}
@Override
public boolean allowHandover() {
return false;
}
@Override
public String toString() {
return "onDone at [" + endpoint.getEndpointUri() + "]";
}
});
queue.add(copy);
if (timeout > 0) {
if (log.isTraceEnabled()) {
log.trace("Waiting for task to complete using timeout (ms): " + timeout + " at [" + endpoint.getEndpointUri() + "]");
}
// lets see if we can get the task done before the timeout
boolean done = false;
try {
done = latch.await(timeout, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
// ignore
}
if (!done) {
exchange.setException(new ExchangeTimedOutException(exchange, timeout));
// count down to indicate timeout
latch.countDown();
}
} else {
if (log.isTraceEnabled()) {
log.trace("Waiting for task to complete (blocking) at [" + endpoint.getEndpointUri() + "]");
}
// no timeout then wait until its done
try {
latch.await();
} catch (InterruptedException e) {
// ignore
}
}
} else {
// no wait, eg its a InOnly then just add to queue and return
queue.add(copy);
}
// we use OnCompletion on the Exchange to callback and wait for the Exchange to be done
// so we should just signal the callback we are done synchronously
callback.done(true);
return true;
}
@Override
protected void doStart() throws Exception {
super.doStart();
endpoint.onStarted(this);
}
@Override
protected void doStop() throws Exception {
endpoint.onStopped(this);
super.doStop();
}
}