/*
* 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 com.facebook.presto.jdbc.internal.netty.handler.codec.marshalling;
import org.jboss.marshalling.Marshaller;
import org.jboss.marshalling.MarshallerFactory;
import org.jboss.marshalling.MarshallingConfiguration;
import com.facebook.presto.jdbc.internal.netty.channel.ChannelHandlerContext;
/**
* {@link UnmarshallerProvider} implementation which use a {@link ThreadLocal} to store references
* to {@link Marshaller} instances. This may give you some performance boost if you need to marshall
* many small {@link Object}'s and your actual Thread count is not to big
*
*
*
*
*/
public class ThreadLocalMarshallerProvider implements MarshallerProvider {
private final ThreadLocal<Marshaller> marshallers = new ThreadLocal<Marshaller>();
private final MarshallerFactory factory;
private final MarshallingConfiguration config;
/**
* Create a new instance of the {@link ThreadLocalMarshallerProvider}
*
* @param factory the {@link MarshallerFactory} to use to create {@link Marshaller}'s if needed
* @param config the {@link MarshallingConfiguration} to use
*/
public ThreadLocalMarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
this.factory = factory;
this.config = config;
}
public Marshaller getMarshaller(ChannelHandlerContext ctx) throws Exception {
Marshaller marshaller = marshallers.get();
if (marshaller == null) {
marshaller = factory.createMarshaller(config);
marshallers.set(marshaller);
}
return marshaller;
}
}