org.apache.mina.filter.codec.demux.MessageEncoder Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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*/
package org.apache.mina.filter.codec.demux;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
/**
* Encodes a certain type of messages.
*
* We didn't provide any dispose method for {@link MessageEncoder}
* because it can give you performance penalty in case you have a lot of
* message types to handle.
*
* @author Apache MINA Project
*
* @see DemuxingProtocolEncoder
* @see MessageEncoderFactory
*
* @param The message type
*/
public interface MessageEncoder {
/**
* Encodes higher-level message objects into binary or protocol-specific data.
* MINA invokes {@link #encode(IoSession, Object, ProtocolEncoderOutput)}
* method with message which is popped from the session write queue, and then
* the encoder implementation puts encoded {@link IoBuffer}s into
* {@link ProtocolEncoderOutput}.
*
* @param session The current session
* @param message The message to encode
* @param out The instance of {@link ProtocolEncoderOutput} that will receive the encoded message
* @throws Exception if the message violated protocol specification
*/
void encode(IoSession session, T message, ProtocolEncoderOutput out) throws Exception;
}