Java tutorial
/* * 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); } }