/*
* 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.servicemix.jbi.nmr;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.servicemix.JbiConstants;
import org.apache.servicemix.MessageExchangeListener;
import org.apache.servicemix.components.util.ComponentSupport;
import org.apache.servicemix.jbi.framework.Registry;
import org.apache.servicemix.jbi.messaging.MessageExchangeImpl;
import org.apache.servicemix.jbi.servicedesc.InternalEndpoint;
import javax.jbi.JBIException;
import javax.jbi.messaging.DeliveryChannel;
import javax.jbi.messaging.InOnly;
import javax.jbi.messaging.MessageExchange;
import javax.jbi.messaging.MessagingException;
import javax.jbi.messaging.NormalizedMessage;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
/**
* Handles publish/subscribe style messaging in the NMR.
*
*
* @version $Revision: 464844 $
*/
public class SubscriptionManager extends ComponentSupport implements MessageExchangeListener {
public static final String COMPONENT_NAME = "#SubscriptionManager#";
private Registry registry;
private String flowName;
private static Log log = LogFactory.getLog(SubscriptionManager.class);
// SM-229: Avoid StackOverflowException
private static final String FROM_SUBSCRIPTION_MANAGER = "org.apache.servicemix.jbi.nmr.from_subman";
/**
* Initialize the SubscriptionManager
* @param broker
* @throws JBIException
*/
public void init(Broker broker, Registry registry) throws JBIException {
this.registry = registry;
broker.getContainer().activateComponent(this, COMPONENT_NAME);
}
/**
* Dispatches the given exchange to all matching subscribers
* @param exchange
* @return true if dispatched to a matching subscriber(s)
*
* @throws JBIException
*/
protected boolean dispatchToSubscribers(MessageExchangeImpl exchange) throws JBIException {
Boolean source = (Boolean) exchange.getProperty(FROM_SUBSCRIPTION_MANAGER);
if (source == null || !source.booleanValue()) {
List list = registry.getMatchingSubscriptionEndpoints(exchange);
if (list != null) {
for (int i = 0; i < list.size(); i++) {
InternalEndpoint endpoint = (InternalEndpoint)list.get(i);
dispatchToSubscriber(exchange, endpoint);
}
}
return list != null && !list.isEmpty();
} else {
return false;
}
}
/**
* Dispatches the given message exchange to the given endpoint
* @param exchange
* @param endpoint
* @throws JBIException
*/
protected void dispatchToSubscriber(MessageExchangeImpl exchange, InternalEndpoint endpoint) throws JBIException {
if (log.isDebugEnabled() && endpoint != null) {
log.debug("Subscription Endpoint: "+endpoint.getEndpointName());
}
// SM-229: Avoid StackOverflowException
Boolean source = (Boolean) exchange.getProperty(FROM_SUBSCRIPTION_MANAGER);
if (source == null || !source.booleanValue()) {
DeliveryChannel channel = getDeliveryChannel();
InOnly me = channel.createExchangeFactory().createInOnlyExchange();
// SM-229: Avoid StackOverflowException
me.setProperty(FROM_SUBSCRIPTION_MANAGER,Boolean.TRUE);
NormalizedMessage in = me.createMessage();
getMessageTransformer().transform(me, exchange.getInMessage(), in);
me.setInMessage(in);
me.setEndpoint(endpoint);
Set names = exchange.getPropertyNames();
for (Iterator iter = names.iterator(); iter.hasNext();) {
String name = (String) iter.next();
me.setProperty(name, exchange.getProperty(name));
}
if (Boolean.TRUE.equals(exchange.getProperty(JbiConstants.SEND_SYNC))) {
channel.sendSync(me);
} else {
channel.send(me);
}
}
}
public String getFlowName() {
return flowName;
}
public void setFlowName(String flowName) {
this.flowName = flowName;
}
public void onMessageExchange(MessageExchange exchange) throws MessagingException {
// We should only receive done exchanges from subscribers
// but we need that so that they can be dequeued
}
}