1 /*
2 * Copyright 2012 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.handler.codec.marshalling;
17
18 import io.netty.channel.ChannelHandlerContext;
19
20 import io.netty.util.concurrent.FastThreadLocal;
21 import org.jboss.marshalling.MarshallerFactory;
22 import org.jboss.marshalling.MarshallingConfiguration;
23 import org.jboss.marshalling.Unmarshaller;
24
25 /**
26 * {@link UnmarshallerProvider} implementation which use a {@link ThreadLocal} to store references
27 * to {@link Unmarshaller} instances. This may give you some performance boost if you need to unmarshall
28 * many small {@link Object}'s.
29 */
30 public class ThreadLocalUnmarshallerProvider implements UnmarshallerProvider {
31 private final FastThreadLocal<Unmarshaller> unmarshallers = new FastThreadLocal<Unmarshaller>();
32
33 private final MarshallerFactory factory;
34 private final MarshallingConfiguration config;
35
36 /**
37 * Create a new instance of the {@link ThreadLocalUnmarshallerProvider}
38 *
39 * @param factory the {@link MarshallerFactory} to use to create {@link Unmarshaller}'s if needed
40 * @param config the {@link MarshallingConfiguration} to use
41 */
42 public ThreadLocalUnmarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
43 this.factory = factory;
44 this.config = config;
45 }
46
47 @Override
48 public Unmarshaller getUnmarshaller(ChannelHandlerContext ctx) throws Exception {
49 Unmarshaller unmarshaller = unmarshallers.get();
50 if (unmarshaller == null) {
51 unmarshaller = factory.createUnmarshaller(config);
52 unmarshallers.set(unmarshaller);
53 }
54 return unmarshaller;
55 }
56
57 }