com.spotify.netty.handler.codec.zmtp.ZMTPFramingEncoder.java Source code

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/*
 * Copyright (c) 2012-2013 Spotify AB
 *
 * Licensed 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 com.spotify.netty.handler.codec.zmtp;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;

import java.util.List;

/**
 * Netty encoder for ZMTP messages.
 */
class ZMTPFramingEncoder extends MessageToMessageEncoder<ZMTPMessage> {

    private final ZMTPSession session;

    public ZMTPFramingEncoder(final ZMTPSession session) {
        this.session = session;
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, ZMTPMessage msg, List<Object> out) throws Exception {
        // TODO (dano): integrate with write batching to avoid buffer creation and reduce garbage

        final int size = ZMTPUtils.messageSize(msg, session.isEnveloped(), session.getActualVersion());
        final ByteBuf buffer = Unpooled.buffer(size);

        ZMTPUtils.writeMessage(msg, buffer, session.isEnveloped(), session.getActualVersion());

        out.add(buffer);
    }
}