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/*
* 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.binding.comet.runtime.handler;
import java.lang.reflect.InvocationTargetException;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.QueryParam;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.binding.comet.runtime.JSONUtil;
import org.apache.tuscany.sca.binding.comet.runtime.manager.CometEndpointManager;
import org.apache.tuscany.sca.binding.comet.runtime.manager.CometOperationManager;
import org.apache.tuscany.sca.binding.comet.runtime.manager.CometSessionManager;
import org.apache.tuscany.sca.core.assembly.impl.RuntimeEndpointImpl;
import org.apache.tuscany.sca.core.assembly.impl.RuntimeEndpointReferenceImpl;
import org.apache.tuscany.sca.core.invocation.Constants;
import org.apache.tuscany.sca.core.invocation.impl.MessageImpl;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
import org.atmosphere.cpr.Broadcaster;
import org.atmosphere.cpr.BroadcasterLifeCyclePolicy;
import org.atmosphere.cpr.BroadcasterLifeCyclePolicy.ATMOSPHERE_RESOURCE_POLICY;
import org.atmosphere.cpr.BroadcasterLifeCyclePolicyListener;
import org.atmosphere.jersey.JerseyBroadcaster;
import org.atmosphere.jersey.SuspendResponse;
/**
* Handles requests for comet services and for creating a persistent connection.
*/
@Path("/")
public class CometBindingHandler {
/**
* Suspends the current HTTP connection.
*
* @param sessionId
* session id to identify client
* @return a response that is not committed, just flushed
*/
@GET
@Path("/connect")
public SuspendResponse<String> connect(@QueryParam("sessionId") String sessionId) {
Broadcaster broadcaster = CometSessionManager.get(sessionId);
if (broadcaster == null) {
broadcaster = new JerseyBroadcaster(sessionId);
BroadcasterLifeCyclePolicy policy = new BroadcasterLifeCyclePolicy.Builder().policy(
ATMOSPHERE_RESOURCE_POLICY.EMPTY_DESTROY).build();
broadcaster.setBroadcasterLifeCyclePolicy(policy);
broadcaster.addBroadcasterLifeCyclePolicyListener(new CometBroadcasterLifeCyclePolicyListener(sessionId));
CometSessionManager.add(sessionId, broadcaster);
}
return new SuspendResponse.SuspendResponseBuilder<String>().broadcaster(broadcaster).outputComments(true)
.build();
}
/**
* Handles requests for service operations.
*
* @param service
* the service to invoke
* @param method
* the method to invoke
* @param sessionId
* the client session id
* @param callbackMethod
* the callbackMethod to invoke once a response is available
* @param jsonData
* method arguments sent by the client in JSON format
* @throws InvocationTargetException
* if a problem occurs while invoking the service implementation
*/
@POST
@Path("/{service}/{method}")
public void handleRequest(@PathParam("service") String service, @PathParam("method") String method,
@FormParam("sessionId") String sessionId, @FormParam("callbackMethod") String callbackMethod,
@FormParam("params") String jsonData) throws InvocationTargetException {
String url = "/" + service + "/" + method;
RuntimeEndpoint wire = CometEndpointManager.get(url);
Operation operation = CometOperationManager.get(url);
final Object[] args = JSONUtil.decodeJsonParamsForOperation(jsonData, operation);
Message msg = createMessageWithMockedCometReference(args, sessionId, callbackMethod);
boolean isVoidReturnType = operation.getOutputType().getLogical().isEmpty();
if (!isVoidReturnType) {
Object response = wire.invoke(operation, args);
Broadcaster broadcaster = CometSessionManager.get(sessionId);
if (broadcaster != null) {
broadcaster.broadcast(callbackMethod + "($.secureEvalJSON('" + JSONUtil.encodeResponse(response)
+ "'))");
}
} else {
wire.invoke(operation, msg);
}
}
/**
* Creates a message with a mocked EndpointReference in the 'from' field to
* simulate a comet reference (because requests are coming from browsers).
* This is needed by the callback mechanism to have a source for the
* request.
*
* @param args
* arguments for the method invocation
* @param sessionId
* the session id of the client
* @param callbackMethod
* method to call once a response is available
* @return an invocation message
*/
private Message createMessageWithMockedCometReference(Object[] args, String sessionId, String callbackMethod) {
Message msg = new MessageImpl();
msg.getHeaders().put(Constants.MESSAGE_ID, sessionId);
msg.setBody(args);
EndpointReference re = new RuntimeEndpointReferenceImpl();
RuntimeEndpointImpl callbackEndpoint = new RuntimeEndpointImpl();
callbackEndpoint.setURI(callbackMethod);
re.setCallbackEndpoint(callbackEndpoint);
msg.setFrom(re);
return msg;
}
public class CometBroadcasterLifeCyclePolicyListener implements BroadcasterLifeCyclePolicyListener {
private String sessionId;
public CometBroadcasterLifeCyclePolicyListener(String sessionId) {
this.sessionId = sessionId;
}
@Override
public void onDestroy() {
}
@Override
public void onEmpty() {
CometSessionManager.remove(sessionId);
}
@Override
public void onIdle() {
}
}
}
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