Source Code Cross Referenced for ByteMessage.java in  » Sevlet-Container » apache-tomcat-6.0.14 » org » apache » catalina » tribes » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » org.apache.catalina.tribes 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.catalina.tribes;
018:
019:        import java.io.Serializable;
020:        import java.io.Externalizable;
021:        import java.io.ObjectInput;
022:        import java.io.IOException;
023:        import java.io.ObjectOutput;
024:
025:        /**
026:         * A byte message is not serialized and deserialized by the channel
027:         * instead it is sent as a byte array<br>
028:         * By default Tribes uses java serialization when it receives an object
029:         * to be sent over the wire. Java serialization is not the most
030:         * efficient of serializing data, and Tribes might not even
031:         * have access to the correct class loaders to deserialize the object properly.
032:         * <br>
033:         * The ByteMessage class is a class where the channel when it receives it will
034:         * not attempt to perform serialization, instead it will simply stream the <code>getMessage()</code>
035:         * bytes.<br>
036:         * If you are using multiple applications on top of Tribes you should add some sort of header
037:         * so that you can decide with the <code>ChannelListener.accept()</code> whether this message was intended
038:         * for you.
039:         * @author Filip Hanik
040:         * @version $Revision: 467222 $, $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
041:         */
042:
043:        public class ByteMessage implements  Serializable, Externalizable {
044:            /**
045:             * Storage for the message to be sent
046:             */
047:            private byte[] message;
048:
049:            /**
050:             * Creates an empty byte message
051:             * Constructor also for deserialization
052:             */
053:            public ByteMessage() {
054:            }
055:
056:            /**
057:             * Creates a byte message wit h
058:             * @param data byte[] - the message contents
059:             */
060:            public ByteMessage(byte[] data) {
061:                message = data;
062:            }
063:
064:            /**
065:             * Returns the message contents of this byte message
066:             * @return byte[] - message contents, can be null
067:             */
068:            public byte[] getMessage() {
069:                return message;
070:            }
071:
072:            /**
073:             * Sets the message contents of this byte message
074:             * @param message byte[]
075:             */
076:            public void setMessage(byte[] message) {
077:                this .message = message;
078:            }
079:
080:            /**
081:             * @see java.io.Externalizable#readExternal
082:             * @param in ObjectInput
083:             * @throws IOException
084:             */
085:            public void readExternal(ObjectInput in) throws IOException {
086:                int length = in.readInt();
087:                message = new byte[length];
088:                in.read(message, 0, length);
089:            }
090:
091:            /**
092:             * @see java.io.Externalizable#writeExternal
093:             * @param out ObjectOutput
094:             * @throws IOException
095:             */
096:            public void writeExternal(ObjectOutput out) throws IOException {
097:                out.writeInt(message != null ? message.length : 0);
098:                if (message != null)
099:                    out.write(message, 0, message.length);
100:            }
101:
102:        }
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