org.apache.catalina.tribes.ByteMessage Maven / Gradle / Ivy
/*
* 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.catalina.tribes;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
/**
* A byte message is not serialized and deserialized by the channel
* instead it is sent as a byte array
* By default Tribes uses java serialization when it receives an object
* to be sent over the wire. Java serialization is not the most
* efficient of serializing data, and Tribes might not even
* have access to the correct class loaders to deserialize the object properly.
*
* The ByteMessage class is a class where the channel when it receives it will
* not attempt to perform serialization, instead it will simply stream the getMessage()
* bytes.
* If you are using multiple applications on top of Tribes you should add some sort of header
* so that you can decide with the ChannelListener.accept() whether this message was intended
* for you.
*/
public class ByteMessage implements Externalizable {
/**
* Storage for the message to be sent
*/
private byte[] message;
/**
* Creates an empty byte message
* Constructor also for deserialization
*/
public ByteMessage() {
}
/**
* Creates a byte message with
* @param data byte[] - the message contents
*/
public ByteMessage(byte[] data) {
message = data;
}
/**
* Returns the message contents of this byte message
* @return byte[] - message contents, can be null
*/
public byte[] getMessage() {
return message;
}
/**
* Sets the message contents of this byte message
* @param message byte[]
*/
public void setMessage(byte[] message) {
this.message = message;
}
@Override
public void readExternal(ObjectInput in ) throws IOException {
int length = in.readInt();
message = new byte[length];
in.readFully(message);
}
@Override
public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(message!=null?message.length:0);
if ( message!=null ) {
out.write(message,0,message.length);
}
}
}