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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 org.apache.camel.component.directvm;
import org.apache.camel.AsyncCallback;
import org.apache.camel.Exchange;
import org.apache.camel.support.DefaultAsyncProducer;
import org.apache.camel.util.StopWatch;
/**
* The direct producer.
* <p/>
* If blocking is enabled ({@code DirectEndpoint#isBlock}) then the DirectEndpoint will create an instance
* of this class instead of {@code DirectProducer}.
* This producers {@code process} method will block for the configured duration ({@code DirectEndpoint#getTimeout},
* default to 30 seconds). After which if a consumer is still unavailable a DirectConsumerNotAvailableException
* will be thrown.
* <p/>
* Implementation note: Concurrent Producers will block for the duration it takes to determine if a
* consumer is available, but actual consumer execution will happen concurrently.
*/
public class DirectVmBlockingProducer extends DefaultAsyncProducer {
private final DirectVmEndpoint endpoint;
public DirectVmBlockingProducer(DirectVmEndpoint endpoint) {
super(endpoint);
this.endpoint = endpoint;
}
public void process(Exchange exchange) throws Exception {
getConsumer(exchange).getProcessor().process(exchange);
}
public boolean process(Exchange exchange, AsyncCallback callback) {
try {
return getConsumer(exchange).getAsyncProcessor().process(exchange, callback);
} catch (Exception e) {
exchange.setException(e);
callback.done(true);
return true;
}
}
protected DirectVmConsumer getConsumer(Exchange exchange) throws Exception {
DirectVmConsumer answer = endpoint.getConsumer();
if (answer == null) {
// okay then await until we have a consumer or we timed out
answer = awaitConsumer();
if (answer == null) {
throw new DirectVmConsumerNotAvailableException("No consumers available on endpoint: " + endpoint, exchange);
}
}
return answer;
}
private DirectVmConsumer awaitConsumer() throws InterruptedException {
DirectVmConsumer answer = null;
StopWatch watch = new StopWatch();
boolean done = false;
while (!done) {
// sleep a bit to give chance for the consumer to be ready
Thread.sleep(500);
if (log.isDebugEnabled()) {
log.debug("Waited {} for consumer to be ready", watch.taken());
}
answer = endpoint.getConsumer();
if (answer != null) {
return answer;
}
// we are done if we hit the timeout
done = watch.taken() >= endpoint.getTimeout();
}
return answer;
}
}