/**
* Send response with a result for a specific request message
*
* @param requestID the id of request to be responsed
* @param result the result of invoked operation
* @param destination the target endpoint
*/
private void sendResponse(int requestID, Object result, String destination) {
Response response =
new Response(messageCount.incrementAndGet(), requestID, this.endpoint, result);
XMLBuilder build = new XMLBuilder();
String responseMessage = build.toXML(response);
serviceProvider.sendMessage(responseMessage, destination);
}
/**
* Send request to invoke a service with specific waiting time
*
* @param service the service name
* @param destination the target endpoint
* @param reply requires reply or not
* @param responseTime the max time for waiting a reply
* @param opName the invoked operation name
* @param params parameters for the operation
* @return the service result
*/
public Object sendRequest(
String service,
String destination,
boolean reply,
long responseTime,
String opName,
Object... params) {
try {
int messageID = messageCount.incrementAndGet();
Request request = new Request(messageID, this.endpoint, service, opName, params);
XMLBuilder build = new XMLBuilder();
String requestMessage = build.toXML(request);
serviceProvider.sendMessage(requestMessage, destination);
if (DEBUG) System.out.println("The request message is: \n" + requestMessage);
if (reply) {
synchronized (this) {
if (responseTime == -1) {
while (!results.containsKey(messageID)) {
this.wait();
}
} else {
long startTime = System.currentTimeMillis();
while (!results.containsKey(messageID)) {
this.wait(responseTime * Time.scale);
long endTime = System.currentTimeMillis();
if ((endTime - startTime) / Time.scale >= responseTime) {
results.put(messageID, new TimeOutError());
}
}
}
}
Object result = results.get(messageID);
results.remove(messageID);
return result != NullObject ? result : null;
}
return null;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/** Stop the service */
public void stopService() {
serviceProvider.stopListening();
}
/** Start the service Listen for incoming messages */
public void startService() {
serviceProvider.startListening(endpoint, this);
}