/**
* Registers this with the associated {@link DestinationCache}s. The consumer may receive messages
* immediately.
*
* @throws JMSException for any JMS error
*/
protected void init() throws JMSException {
JmsTopic topic = (JmsTopic) getDestination();
// register the endpoint with the destination
if (topic.isWildCard()) {
// if the topic is a wild card then we need to retrieve a
// set of matching destination caches.
_caches = _destinations.getTopicDestinationCaches(topic);
// for each cache register this endpoint as a consumer of
// it's messages. Before doing so register as a destination
// event listener with the DestinationManager
_destinations.addDestinationEventListener(this);
DestinationCache[] caches = getDestinationCaches();
for (int i = 0; i < caches.length; ++i) {
caches[i].addConsumer(this);
}
} else {
// if the topic is not a wildcard then we need to get the
// destination cache. If one does not exist then we need to
// create it.
DestinationCache cache = _destinations.getDestinationCache(topic);
_caches.put(topic, cache);
cache.addConsumer(this);
}
}
/**
* Invoked when a message cache is created.
*
* @param destination the destination that messages are being cached for
* @param cache the corresponding cache
*/
public void cacheAdded(JmsDestination destination, DestinationCache cache) {
if (destination instanceof JmsTopic) {
JmsTopic myTopic = (JmsTopic) getDestination();
JmsTopic topic = (JmsTopic) destination;
if (myTopic.match(topic) && !_caches.containsKey(topic)) {
_caches.put(topic, cache);
cache.addConsumer(this);
}
}
}
/**
* Determines if this consumer can consume messages from the specified destination.
*
* @param destination the destination
* @return <code>true</code> if the consumer can consume messages from <code>destination</code>;
* otherwise <code>false</code>
*/
public boolean canConsume(JmsDestination destination) {
boolean result = false;
if (destination instanceof JmsTopic) {
JmsTopic topic = (JmsTopic) getDestination();
if (!topic.isWildCard()) {
result = super.canConsume(destination);
} else {
result = topic.match((JmsTopic) destination);
}
}
return result;
}
