/*
* 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.tomcat.bayeux.request;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletException;
import org.apache.cometd.bayeux.Bayeux;
import org.apache.cometd.bayeux.Channel;
import org.apache.tomcat.bayeux.BayeuxException;
import org.apache.tomcat.bayeux.BayeuxRequest;
import org.apache.tomcat.bayeux.ChannelImpl;
import org.apache.tomcat.bayeux.ClientImpl;
import org.apache.tomcat.bayeux.HttpError;
import org.apache.tomcat.bayeux.RequestBase;
import org.apache.tomcat.bayeux.TomcatBayeux;
import org.apache.tomcat.util.json.JSONException;
import org.apache.tomcat.util.json.JSONObject;
import org.jboss.servlet.http.HttpEvent;
/******************************************************************************
* Handshake request Bayeux message.
*
* @author Guy A. Molinari
* @author Filip Hanik
* @version 1.0
*
*/
public class MetaUnsubscribeRequest extends RequestBase implements BayeuxRequest {
protected static HashMap<String,Object> responseTemplate = new HashMap<String,Object>();
static {
responseTemplate.put(Bayeux.CHANNEL_FIELD,Bayeux.META_UNSUBSCRIBE);
responseTemplate.put(Bayeux.SUCCESSFUL_FIELD,Boolean.TRUE);
responseTemplate.put(Bayeux.ADVICE_FIELD, new HashMap<String, Object>());
}
public MetaUnsubscribeRequest(TomcatBayeux tb, HttpEvent event, JSONObject jsReq) throws JSONException {
super(tb, event, jsReq);
}
/**
* Check client request for validity.
*
* Per section 4.6.1 of the Bayuex spec a connect request must contain:
* 1) The "/meta/unsubscribe" channel identifier.
* 2) The clientId.
* 3) The subscription. This is the name of the channel of interest,
* or a pattern.
*
* @return HttpError This method returns null if no errors were found
*/
public HttpError validate() {
if(clientId==null|| (!this.getTomcatBayeux().hasClient(clientId)))
return new HttpError(400,"Client Id not valid.", null);
if (subscription==null||subscription.length()==0)
return new HttpError(400,"Subscription missing.",null);
return null;//no error
}
/**
* De-register interest for one or more channels. Per section 2.2.1 of the
* Bayeux spec, a pattern may be specified. Sever relationships.
*/
public int process(int prevops) throws BayeuxException {
prevops = super.process(prevops);
response = (HashMap<String, Object>)responseTemplate.clone();
ClientImpl client = (ClientImpl)getTomcatBayeux().getClient(clientId);
HttpError error = validate();
if (error == null) {
boolean wildcard = subscription.indexOf('*')!=-1;
boolean unsubscribed = false;
if (wildcard) {
List<Channel> channels = getTomcatBayeux().getChannels();
Iterator<Channel> it = channels.iterator();
while (it.hasNext()) {
ChannelImpl ch = (ChannelImpl)it.next();
if (ch.matches(subscription)) {
ch.unsubscribe(client);
unsubscribed = true;
}
}
}else {
ChannelImpl ch = (ChannelImpl)getTomcatBayeux().getChannel(subscription,true);
ch.unsubscribe(client);
unsubscribed = true;
}
response.put(Bayeux.SUCCESSFUL_FIELD, Boolean.valueOf(unsubscribed));
response.put(Bayeux.SUBSCRIPTION_FIELD,subscription);
((HashMap) response.get(Bayeux.ADVICE_FIELD)).put("reconnect", "retry");
((HashMap) response.get(Bayeux.ADVICE_FIELD)).put("interval", getReconnectInterval());
}else {
response.put(Bayeux.SUCCESSFUL_FIELD,Boolean.FALSE);
response.put(Bayeux.ERROR_FIELD, error.toString());
((HashMap) response.get(Bayeux.ADVICE_FIELD)).put("reconnect", "handshake");
if (client==null) client = TomcatBayeux.getErrorClient();
}
response.put(Bayeux.CLIENT_FIELD, client.getId());
response.put(Bayeux.TIMESTAMP_FIELD,getTimeStamp());
try {
JSONObject obj = new JSONObject(response);
addToDeliveryQueue(client, obj);
} catch (ServletException x) {
throw new BayeuxException(x);
} catch (IOException x) {
throw new BayeuxException(x);
}
return 0;
}
}