1 /*** 2 * 3 * Copyright 2004 Hiram Chirino 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.activeio.filter; 18 19 import java.io.IOException; 20 21 import org.activeio.AsynchChannel; 22 import org.activeio.FilterAsynchChannel; 23 import org.activeio.Packet; 24 25 /*** 26 * This PacketAggregatingAsynchChannel can be used when the client is sending a 27 * 'record' style packet down the channel stack and needs receiving end to 28 * receive the same 'record' packets. 29 * 30 * This is very usefull since in general, a channel does not garantee that a 31 * Packet that is sent down will not be fragmented or combined with other Packet 32 * objects. 33 * 34 * This {@see org.activeio.AsynchChannel} adds a 4 byte header 35 * to each packet that is sent down. 36 * 37 * @version $Revision$ 38 */ 39 final public class PacketAggregatingAsynchChannel extends FilterAsynchChannel { 40 41 private final PacketAggregator aggregator = new PacketAggregator() { 42 protected void packetAssembled(Packet packet) { 43 getAsynchChannelListener().onPacket(packet); 44 } 45 }; 46 47 public PacketAggregatingAsynchChannel(AsynchChannel next) { 48 super(next); 49 } 50 51 public void onPacket(Packet packet) { 52 try { 53 aggregator.addRawPacket(packet); 54 } catch (IOException e) { 55 getAsynchChannelListener().onPacketError(e); 56 } 57 } 58 59 public void write(Packet packet) throws IOException { 60 getNext().write(aggregator.getHeader(packet)); 61 getNext().write(packet); 62 } 63 64 }