org.atmosphere.handler.OnMessage Maven / Gradle / Ivy
/*
* Copyright 2015 Jean-Francois Arcand
*
* Licensed 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.atmosphere.handler;
import org.atmosphere.cpr.AtmosphereHandler;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.AtmosphereResourceEvent;
import org.atmosphere.cpr.AtmosphereResourceImpl;
import org.atmosphere.cpr.AtmosphereResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.List;
/**
* Simple {@link AtmosphereHandler} that must be used with the {@link org.atmosphere.interceptor.AtmosphereResourceLifecycleInterceptor}
* and {@link org.atmosphere.interceptor.BroadcastOnPostAtmosphereInterceptor} to reduce the handling of the suspend/resume/disconnect and
* broadcast operation.
*
* You can also safely used this class with {@link org.atmosphere.cpr.BroadcasterCache}.
* method
*
* @author Jeanfrancois Arcand
*/
public abstract class OnMessage extends AbstractReflectorAtmosphereHandler {
public final static String MESSAGE_DELIMITER = "|";
private final Logger logger = LoggerFactory.getLogger(OnMessage.class);
@Override
public final void onRequest(AtmosphereResource resource) throws IOException {
if (resource.getRequest().getMethod().equalsIgnoreCase("GET")) {
onOpen(resource);
}
}
@Override
public final void onStateChange(AtmosphereResourceEvent event) throws IOException {
AtmosphereResponse response = ((AtmosphereResourceImpl) event.getResource()).getResponse(false);
logger.trace("{} with event {}", event.getResource().uuid(), event);
if (event.isCancelled() || event.isClosedByApplication() || event.isClosedByClient()) {
onDisconnect(response);
} else if (event.getMessage() != null && List.class.isAssignableFrom(event.getMessage().getClass())) {
List messages = List.class.cast(event.getMessage());
for (T t : messages) {
onMessage(response, t);
}
} else if (event.isResuming()) {
onResume(response);
} else if (event.isResumedOnTimeout()) {
onTimeout(response);
} else if (event.isSuspended()) {
onMessage(response, (T) event.getMessage());
}
postStateChange(event);
}
@Override
public final void destroy() {
}
/**
* This method will be invoked when an connection has been received and not haven't yet be suspended. Note that
* the connection will be suspended AFTER the method has been invoked when used with {@link org.atmosphere.interceptor.AtmosphereResourceLifecycleInterceptor}
*
* @param resource an {@link AtmosphereResource}
* @throws IOException
*/
public void onOpen(AtmosphereResource resource) throws IOException {
}
/**
* Implement this method to get invoked every time a new {@link org.atmosphere.cpr.Broadcaster#broadcast(Object)}
* occurs.
*
* @param response an {@link AtmosphereResponse}
* @param message a message of type T
*/
abstract public void onMessage(AtmosphereResponse response, T message) throws IOException;
/**
* This method will be invoked during the process of resuming a connection. By default this method does nothing.
*
* @param response an {@link AtmosphereResponse}.
* @throws IOException
*/
public void onResume(AtmosphereResponse response) throws IOException {
}
/**
* This method will be invoked when a suspended connection times out, e.g no activity has occurred for the
* specified time used when suspending. By default this method does nothing.
*
* @param response an {@link AtmosphereResponse}.
* @throws IOException
*/
public void onTimeout(AtmosphereResponse response) throws IOException {
}
/**
* This method will be invoked when the underlying WebServer detects a connection has been closed. Please
* note that not all WebServer supports that features (see Atmosphere's WIKI for help). By default this method does nothing.
*
* @param response an {@link AtmosphereResponse}.
* @throws IOException
*/
public void onDisconnect(AtmosphereResponse response) throws IOException {
}
}