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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.jboss.netty.handler.codec.marshalling;

import org.jboss.marshalling.MarshallerFactory;
import org.jboss.marshalling.MarshallingConfiguration;
import org.jboss.marshalling.Unmarshaller;
import org.jboss.netty.channel.ChannelHandlerContext;

/**
 * {@link UnmarshallerProvider} implementation which use a {@link ThreadLocal} to store references
 * to {@link Unmarshaller} instances. This may give you some performance boost if you need to unmarshall
 * many small {@link Object}'s.
 *
 *
 */
public class ThreadLocalUnmarshallerProvider implements UnmarshallerProvider {
    private final ThreadLocal unmarshallers = new ThreadLocal();

    private final MarshallerFactory factory;
    private final MarshallingConfiguration config;

    /**
     * Create a new instance of the {@link ThreadLocalUnmarshallerProvider}
     *
     * @param factory   the {@link MarshallerFactory} to use to create {@link Unmarshaller}'s if needed
     * @param config    the {@link MarshallingConfiguration} to use
     */
    public ThreadLocalUnmarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
        this.factory = factory;
        this.config = config;
    }

    public Unmarshaller getUnmarshaller(ChannelHandlerContext ctx) throws Exception {
        Unmarshaller unmarshaller = unmarshallers.get();
        if (unmarshaller == null) {
            unmarshaller = factory.createUnmarshaller(config);
            unmarshallers.set(unmarshaller);
        }
        return unmarshaller;
    }

}