Sending synchronous Messages

When an Agent wants to send a message it first requests an AgentCommProxy. It then calls the method sendMessage on this proxy which wraps the method to the communication service. Like with the move method the CommService will call the method executeMessage directly on the remote communication service or through its output proxy. The target communication service looks up the AgentLoader for the target Agent by calling the getLoader on its helper and then asks the AgentLoader to invoke the message on the target Agent. All method calls up to here are blocked until the target Agent returns the result of the message invocation. The return goes the same way back. When an exception occurs it will be given through to the local communication service which wraps them to the two thrown exception AgentNotFoundException and SecurityException. It uses a similar exception handling like the RemoteException of RMI which can contain a nested, different exception.