Java tutorial
package org.gameoss.gridcast.p2p.serialization; /* * #%L * Gridcast * %% * Copyright (C) 2014 Charles Barry * %% * 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. * #L% */ import com.dyuproject.protostuff.ProtostuffIOUtil; import com.dyuproject.protostuff.Schema; import com.dyuproject.protostuff.runtime.RuntimeSchema; import org.gameoss.gridcast.p2p.message.MessageRegistry; import io.netty.buffer.ByteBuf; import io.netty.buffer.ByteBufInputStream; import io.netty.channel.ChannelHandlerContext; import io.netty.handler.codec.MessageToMessageDecoder; import java.io.IOException; import java.util.List; public class ProtostuffDecoder extends MessageToMessageDecoder<ByteBuf> { private final MessageRegistry registry; public ProtostuffDecoder(MessageRegistry registry) { this.registry = registry; } @Override protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) throws Exception { Object obj = deserializeFromByteBuf(registry, msg); out.add(obj); } /** * Expose deserializer for unit testing. * * @param registry * @param buf * @return * @throws IOException */ public static Object deserializeFromByteBuf(MessageRegistry registry, ByteBuf buf) throws IOException { // get message class int typeIdx = buf.readInt(); Class<?> clazz = registry.getClassFromId(typeIdx); // decode rest of array into object Schema schema = RuntimeSchema.getSchema(clazz); Object obj = schema.newMessage(); ProtostuffIOUtil.mergeFrom(new ByteBufInputStream(buf), obj, schema); return obj; } }