| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.tuscany.sca.itest; |
| |
| import java.util.Map; |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import java.util.UUID; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.oasisopen.sca.ServiceReference; |
| import org.oasisopen.sca.annotation.Callback; |
| import org.oasisopen.sca.annotation.Destroy; |
| import org.oasisopen.sca.annotation.Scope; |
| import org.oasisopen.sca.annotation.Service; |
| |
| /** |
| * Sample Event Processor Service Implementation |
| */ |
| @Service(EventProcessorService.class) |
| @Scope("COMPOSITE") |
| public class EventProcessorServiceImpl implements EventProcessorService { |
| |
| /** |
| * Reference to the call back |
| */ |
| @Callback |
| protected ServiceReference<EventProcessorCallBack> clientCallback; |
| |
| /** |
| * This map contains the call backs for each of the registered Event names |
| */ |
| private final Map<String, ServiceReference<EventProcessorCallBack>> eventListeners; |
| |
| /** |
| * The list of all Event Generators we create |
| */ |
| private final EventGenerator[] allEventGenerators; |
| |
| /** |
| * Constructor. Starts the Event Generators |
| */ |
| public EventProcessorServiceImpl() { |
| eventListeners = new ConcurrentHashMap<String, ServiceReference<EventProcessorCallBack>>(); |
| |
| // We will simulate an Event generator |
| allEventGenerators = new EventGenerator[2]; |
| allEventGenerators[0] = new EventGenerator("FAST", 10); // Generate the FAST event every 10ms |
| allEventGenerators[1] = new EventGenerator("SLOW", 50); // Generate the SLOW event every 50ms |
| } |
| |
| /** |
| * Registers the client to receive notifications for the specified event |
| * |
| * @param aEventName The name of the Event to register |
| */ |
| public void registerForEvent(String aEventName) { |
| // Register for the Event |
| eventListeners.put(aEventName, clientCallback); |
| |
| // Send the "register" started event to the client |
| receiveEvent(aEventName, "SameThread: Registered to receive notifications for " + aEventName); |
| } |
| |
| /** |
| * Unregisters the client so it no longer receives notifications for the specified event |
| * |
| * @param aEventName The name of the Event to unregister |
| */ |
| public void unregisterForEvent(String aEventName) { |
| // Send the "register" started event to the client |
| receiveEvent(aEventName, "SameThread: Unregister from receiving notifications for " + aEventName); |
| |
| eventListeners.remove(aEventName); |
| } |
| |
| /** |
| * This method is called whenever the EventProcessorService receives an Event |
| * |
| * @param aEventName The name of the Event received |
| * @param aEventData The Event data |
| */ |
| private void receiveEvent(String aEventName, Object aEventData) { |
| // Get the listener for the Event |
| final ServiceReference<EventProcessorCallBack> callback = eventListeners.get(aEventName); |
| if (callback == null) { |
| //System.out.println("No registered listeners for " + aEventName); |
| return; |
| } |
| |
| // Trigger the call back |
| // System.out.println("Notifying " + callback + " of event " + aEventName); |
| callback.getService().eventNotification(aEventName, aEventData); |
| // System.out.println("Done notify " + callback + " of event " + aEventName); |
| } |
| |
| /** |
| * Shuts down the Event Processor |
| */ |
| @Destroy |
| public void shutdown() { |
| System.out.println("Shutting down the EventProcessor"); |
| |
| // Clear list of call back locations as we don't want to send any more notifications |
| eventListeners.clear(); |
| |
| // Stop the Event Generators |
| for (EventGenerator generator : allEventGenerators) { |
| generator.stop(); |
| } |
| } |
| |
| /** |
| * Utility class for generating Events |
| */ |
| private final class EventGenerator { |
| /** |
| * The Timer we are using to generate the events |
| */ |
| private final Timer timer = new Timer(); |
| |
| /** |
| * Lock object to ensure that we can cancel the timer cleanly. |
| */ |
| private final Object lock = new Object(); |
| |
| /** |
| * Constructor |
| * |
| * @param aEventName The name of the Event to generate |
| * @param frequencyInMilliseconds How frequently we should generate the Events |
| */ |
| private EventGenerator(String aEventName, int frequencyInMilliseconds) { |
| timer.schedule(new EventGeneratorTimerTask(aEventName), |
| frequencyInMilliseconds, |
| frequencyInMilliseconds); |
| } |
| |
| /** |
| * Stop this Event Generator |
| */ |
| private void stop() { |
| synchronized (lock) { |
| timer.cancel(); |
| } |
| } |
| |
| /** |
| * The TimerTask that is invoked by the Timer for the EventGenerator |
| */ |
| private final class EventGeneratorTimerTask extends TimerTask { |
| /** |
| * The name of the Event we should generate |
| */ |
| private final String eventName; |
| |
| /** |
| * Constructor |
| * |
| * @param aEventName The name of the Event we should generate |
| */ |
| private EventGeneratorTimerTask(String aEventName) { |
| eventName = aEventName; |
| } |
| |
| /** |
| * Timer calls this method and it will generate an Event |
| */ |
| |
| public void run() { |
| synchronized(lock) { |
| // System.out.println("Generating new event " + eventName); |
| receiveEvent(eventName, "Separate Thread Notification: " + UUID.randomUUID().toString()); |
| } |
| } |
| } |
| } |
| } |