/**
 * 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.storm.messaging.netty;

import org.apache.storm.shade.io.netty.buffer.ByteBuf;
import org.apache.storm.shade.io.netty.channel.ChannelHandler;
import org.apache.storm.shade.io.netty.channel.ChannelHandlerContext;
import org.apache.storm.shade.io.netty.handler.codec.MessageToByteEncoder;

@ChannelHandler.Sharable
public class NettySerializableMessageEncoder extends MessageToByteEncoder<INettySerializable> {

    public static final NettySerializableMessageEncoder INSTANCE = new NettySerializableMessageEncoder();
    
    private NettySerializableMessageEncoder() {}
    
    @Override
    protected void encode(ChannelHandlerContext ctx, INettySerializable msg, ByteBuf out) throws Exception {
        msg.write(out);
    }

    @Override
    protected ByteBuf allocateBuffer(ChannelHandlerContext ctx, INettySerializable msg, boolean preferDirect) throws Exception {
        return ctx.alloc().ioBuffer(msg.encodeLength());
    }

}