/**
* Adds the given Publisher to the system.
*
* @param pub The given Publisher object
* @return Returns true if the Publisher was added successfully else return false
*/
public boolean addPublisher(Publisher pub) {
if (pub == null
|| pub.getPublisher().getType() == null
|| pub.getPublisher().getType().contains(null)) return false;
return publishers.add(pub.getPublisher());
}
/**
* Subscribes a given Subscriber with the given subscription type
*
* @param subscriber The given Subscriber object
* @param type Type of subscription
* @return Returns true if the subscription was successfully applied for the given type
*/
public boolean subscribe(Subscriber subscriber, String type) {
boolean flag = false;
if (subscriber != null && type != null) {
for (Publisher pub : publishers) {
if (pub.getPublisher().getType().contains(type)) {
flag = true;
break;
}
}
if (!flag) return false;
NewSubscriber newSubscriber = subscriber.getSubscriber();
ArrayList<String> temp = subscriberMap.get(newSubscriber);
if (temp != null) {
if (temp.contains(type)) return false;
subscriberMap.get(newSubscriber).add(type);
return true;
} else {
ArrayList<String> tempType = new ArrayList<String>();
tempType.add(type);
subscriberMap.put(newSubscriber, tempType);
return true;
}
}
return false;
}
/**
* Publishes the given message from Publisher
*
* @param publisherName The given Publisher object
* @param messageDetails Message to be published
* @return Returns true if the subscription of the type <b>type</b> was removed successfully else
* returns false
*/
public boolean publishMessage(Publisher publisherName, Message messageDetails) {
if (publisherName != null && messageDetails != null) {
NewPublisher publisher = publisherName.getPublisher();
if (!publishers.contains(publisher)) {
return false;
}
for (Subscriber sub : subscriberMap.keySet()) {
if (subscriberMap
.get(sub)
.contains(messageDetails.getMessage().getMetadata().getMessageType())) {
sub.getSubscriber().receivedMessage(messageDetails);
}
}
}
return false;
}
/**
* Removes the given Publisher from the system.
*
* @param pub The given Publisher object
* @return Returns true if the Publisher was removed successfully else returns false
*/
public boolean removePublisher(Publisher pub) {
if (pub == null || pub.getPublisher() == null) return false;
return publishers.remove(pub.getPublisher());
}