/**
* 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.stomp;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.camel.Consumer;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.impl.DefaultEndpoint;
import org.fusesource.hawtbuf.AsciiBuffer;
import org.fusesource.hawtdispatch.Task;
import org.fusesource.stomp.client.Callback;
import org.fusesource.stomp.client.CallbackConnection;
import org.fusesource.stomp.client.Promise;
import org.fusesource.stomp.client.Stomp;
import org.fusesource.stomp.codec.StompFrame;
import static org.fusesource.hawtbuf.UTF8Buffer.utf8;
import static org.fusesource.stomp.client.Constants.DESTINATION;
import static org.fusesource.stomp.client.Constants.DISCONNECT;
import static org.fusesource.stomp.client.Constants.ID;
import static org.fusesource.stomp.client.Constants.SEND;
import static org.fusesource.stomp.client.Constants.SUBSCRIBE;
import static org.fusesource.stomp.client.Constants.UNSUBSCRIBE;
public class StompEndpoint extends DefaultEndpoint {
private CallbackConnection connection;
private StompConfiguration configuration;
private String destination;
private Stomp stomp;
private final List<StompConsumer> consumers = new CopyOnWriteArrayList<StompConsumer>();
public StompEndpoint(String uri, StompComponent component, StompConfiguration configuration, String destination) {
super(uri, component);
this.configuration = configuration;
this.destination = destination;
}
public Producer createProducer() throws Exception {
return new StompProducer(this);
}
public Consumer createConsumer(Processor processor) throws Exception {
return new StompConsumer(this, processor);
}
public boolean isSingleton() {
return true;
}
@Override
protected void doStart() throws Exception {
final Promise<CallbackConnection> promise = new Promise<CallbackConnection>();
stomp = new Stomp(configuration.getBrokerURL());
stomp.setLogin(configuration.getLogin());
stomp.setPasscode(configuration.getPasscode());
stomp.connectCallback(promise);
connection = promise.await();
connection.getDispatchQueue().execute(new Task() {
@Override
public void run() {
connection.receive(new Callback<StompFrame>() {
@Override
public void onFailure(Throwable value) {
if (started.get()) {
connection.close(null);
}
}
@Override
public void onSuccess(StompFrame value) {
if (!consumers.isEmpty()) {
Exchange exchange = createExchange();
exchange.getIn().setBody(value.content());
for (StompConsumer consumer : consumers) {
consumer.processExchange(exchange);
}
}
}
});
connection.resume();
}
});
}
@Override
protected void doStop() throws Exception {
connection.getDispatchQueue().execute(new Task() {
@Override
public void run() {
StompFrame frame = new StompFrame(DISCONNECT);
connection.send(frame, null);
}
});
connection.close(null);
}
protected void send(Message message) {
final StompFrame frame = new StompFrame(SEND);
frame.addHeader(DESTINATION, StompFrame.encodeHeader(destination));
frame.content(utf8(message.getBody().toString()));
connection.getDispatchQueue().execute(new Task() {
@Override
public void run() {
connection.send(frame, null);
}
});
}
void addConsumer(final StompConsumer consumer) {
connection.getDispatchQueue().execute(new Task() {
@Override
public void run() {
StompFrame frame = new StompFrame(SUBSCRIBE);
frame.addHeader(DESTINATION, StompFrame.encodeHeader(destination));
frame.addHeader(ID, consumer.id);
connection.send(frame, null);
}
});
consumers.add(consumer);
}
void removeConsumer(final StompConsumer consumer) {
connection.getDispatchQueue().execute(new Task() {
@Override
public void run() {
StompFrame frame = new StompFrame(UNSUBSCRIBE);
frame.addHeader(DESTINATION, StompFrame.encodeHeader(destination));
frame.addHeader(ID, consumer.id);
connection.send(frame, null);
}
});
consumers.remove(consumer);
}
AsciiBuffer getNextId() {
return connection.nextId();
}
}