| /* |
| * 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; |
| |
| import java.util.LinkedList; |
| |
| import org.apache.cometd.bayeux.Channel; |
| import org.apache.cometd.bayeux.Client; |
| import org.apache.cometd.bayeux.DataFilter; |
| import java.util.Collections; |
| import java.util.List; |
| import org.apache.cometd.bayeux.Message; |
| import java.util.Iterator; |
| import org.apache.juli.logging.Log; |
| import org.apache.juli.logging.LogFactory; |
| /** |
| * |
| * @version 1.0 |
| */ |
| public class ChannelImpl implements Channel { |
| |
| private static final Log log = LogFactory.getLog(ChannelImpl.class); |
| |
| /** |
| * The unique id of this channel |
| */ |
| protected String id = null; |
| |
| /** |
| * A list of the current subscribers |
| */ |
| protected LinkedList<Client> subscribers = new LinkedList<Client>(); |
| |
| /** |
| * A list of the current filters |
| */ |
| protected LinkedList<DataFilter> filters = new LinkedList<DataFilter>(); |
| |
| /** |
| * Is this channel persistent, default value is true |
| */ |
| protected boolean persistent = true; |
| |
| /** |
| * Creates a new channel |
| * @param id String - the id of the channel, can not be null |
| */ |
| protected ChannelImpl(String id) { |
| assert id != null; |
| this.id = id; |
| } |
| |
| /** |
| * returns the id of this channel |
| * @return String |
| */ |
| public String getId() { |
| return id; |
| } |
| |
| /** |
| * Returns true if this channel matches the pattern to its id. |
| * The channel pattern can be a complete name like <code>/service/mychannel</code> |
| * or it can be a wild card pattern like <code>/service/app2/**</code> |
| * @param pattern String according to the Bayeux specification section 2.2.1 Channel Globbing, can not be null. |
| * @return boolean true if the id of this channel matches the pattern |
| */ |
| public boolean matches(String pattern) { |
| if (pattern == null) |
| throw new NullPointerException("Channel pattern must not be null."); |
| if (getId().equals(pattern)) |
| return true; |
| int wildcardPos = pattern.indexOf("/*"); |
| if (wildcardPos == -1) |
| return false; |
| boolean multiSegment = pattern.indexOf("**") != -1; |
| String leadSubstring = pattern.substring(0, wildcardPos); |
| if (leadSubstring == null) |
| return false; |
| if (multiSegment) |
| return getId().startsWith(leadSubstring); |
| else { |
| if (getId().length() <= wildcardPos + 2) |
| return false; |
| return !(getId().substring(wildcardPos + 2).contains("/")); |
| } |
| } |
| |
| |
| |
| /** |
| * @return returns a non modifiable list of the subscribers for this channel. |
| */ |
| public List<Client> getSubscribers() { |
| return Collections.unmodifiableList(subscribers); |
| } |
| |
| /** |
| * @return true if the Channel will persist without any subscription. |
| */ |
| public boolean isPersistent() { |
| return persistent; |
| } |
| |
| public void publish(Message msg) { |
| publish(new Message[] {msg}); |
| } |
| |
| public void publish(Message[] msgs) { |
| if (msgs==null) return; |
| MessageImpl[] imsgs = new MessageImpl[msgs.length]; |
| for (int i=0; msgs!=null && i<msgs.length; i++) { |
| Message data = msgs[i]; |
| |
| if (!(data instanceof MessageImpl)) |
| throw new IllegalArgumentException("Invalid message class, you can only publish messages "+ |
| "created through the Bayeux.newMessage() method"); |
| if (log.isDebugEnabled()) { |
| log.debug("Publishing message:"+data+" to channel:"+this); |
| } |
| //clone it so that we can set this channel as a reference |
| MessageImpl msg = (MessageImpl)((MessageImpl)data).clone(); |
| //this is the channel it was delivered through |
| msg.setChannel(this); |
| //pass through filters |
| for (Iterator<DataFilter> it = filters.iterator(); it.hasNext(); ) { |
| it.next().filter(msg); |
| } |
| imsgs[i] = msg; |
| } |
| //deliver it to the clients |
| for (Iterator<Client> it = subscribers.iterator(); it.hasNext(); ) { |
| ClientImpl c = (ClientImpl)it.next(); |
| c.deliverInternal(this,imsgs); |
| } |
| |
| } |
| |
| public void setPersistent(boolean persistent) { |
| this.persistent = persistent; |
| } |
| |
| public void subscribe(Client subscriber) { |
| if (!subscribers.contains((subscriber))) { |
| subscribers.addLast(subscriber); |
| ((ClientImpl)subscriber).subscribed(this); |
| } |
| } |
| |
| public Client unsubscribe(Client subscriber) { |
| if (subscribers.remove(subscriber)) { |
| ((ClientImpl)subscriber).unsubscribed(this); |
| return subscriber; |
| } else |
| return null; |
| } |
| |
| public void addFilter(DataFilter filter) { |
| if (!filters.contains(filter)) |
| filters.addLast(filter); |
| } |
| |
| public DataFilter removeFilter(DataFilter filter) { |
| if ( filters.remove(filter) ) return filter; |
| else return null; |
| } |
| |
| public String toString() { |
| StringBuilder buf = new StringBuilder(super.toString()); |
| buf.append("; channelId=").append(getId()); |
| return buf.toString(); |
| } |
| |
| } |