/**
* An agent on the FrontEnd has sent a message. Note that the NotFoundException here is referred
* to the sender and indicates an inconsistency between the FrontEnd and the BackEnd
*/
public void messageOut(ACLMessage msg, String sender) throws NotFoundException, IMTPException {
// Check whether the sender exists
AID id = new AID(sender, AID.ISLOCALNAME);
synchronized (frontEndSynchLock) {
AgentImage image = getAgentImage(id);
if (image == null) {
if (synchronizing) {
// The image is not yet there since the front-end is synchronizing.
// Buffer the message. It will be delivered as soon as the
// FrontEnd synchronization process completes
postponeAfterFrontEndSynch(msg, sender);
return;
} else {
throw new NotFoundException("No image for agent " + sender + " on the BackEndContainer");
}
}
}
int size;
if (msg.hasByteSequenceContent()) {
size = msg.getByteSequenceContent().length;
} else {
size = msg.getContent() != null ? msg.getContent().length() : 0;
}
myLogger.log(
Logger.INFO,
getID()
+ " - Delivering OUT message "
+ ACLMessage.getPerformative(msg.getPerformative())
+ ", size="
+ size);
handleSend(msg, id, false);
}
/**
* Dispatch a message to an agent in the FrontEnd. If this method is called by a thread that is
* serving a message sent by an agent in the FrontEnd too, nothing is done as the dispatch has
* already taken place in the FrontEnd (see messageOut()).
*/
public boolean postMessageToLocalAgent(ACLMessage msg, AID receiverID) {
// Try first in the LADT
boolean found = super.postMessageToLocalAgent(msg, receiverID);
if (found) {
return found;
} else {
// The receiver must be in the FrontEnd
AgentImage image = (AgentImage) agentImages.get(receiverID);
if (image != null) {
if (agentImages.containsKey(msg.getSender()) && isExplicitReceiver(msg, receiverID)) {
// The message was sent by an agent living in the FrontEnd. The
// receiverID (living in the FrontEnd too) has already received
// the message.
// The second part of the condition ensures that, if the
// message was not directly sent to the receiver (e.g. it was sent to a topic
// or an alias), message delivery occurs normally.
// FIXME: This does not take into account that an agent not living
// in the FrontEnd may send a message on behalf of an agent living
// in the FrontEnd.
return true;
}
try {
// Forward the message to the FrontEnd
int size;
if (msg.hasByteSequenceContent()) {
size = msg.getByteSequenceContent().length;
} else {
size = msg.getContent() != null ? msg.getContent().length() : 0;
}
myLogger.log(
Logger.INFO,
getID()
+ " - Delivering IN message "
+ ACLMessage.getPerformative(msg.getPerformative())
+ ", size="
+ size);
myFrontEnd.messageIn(msg, receiverID.getLocalName());
handlePosted(receiverID, msg);
return true;
} catch (NotFoundException nfe) {
System.out.println("WARNING: Missing agent in FrontEnd");
return false;
} catch (IMTPException imtpe) {
System.out.println("WARNING: Can't deliver message to FrontEnd");
return false;
}
} else {
// Agent not found
System.out.println("WARNING: Agent " + receiverID + " not found on BackEnd container");
return false;
}
}
}