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 * http://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.serialization;
17
18 import java.util.Map;
19
20 class CachingClassResolver implements ClassResolver {
21
22 private final Map<String, Class<?>> classCache;
23 private final ClassResolver delegate;
24
25 CachingClassResolver(ClassResolver delegate, Map<String, Class<?>> classCache) {
26 this.delegate = delegate;
27 this.classCache = classCache;
28 }
29
30 @Override
31 public Class<?> resolve(String className) throws ClassNotFoundException {
32 // Query the cache first.
33 Class<?> clazz;
34 clazz = classCache.get(className);
35 if (clazz != null) {
36 return clazz;
37 }
38
39 // And then try to load.
40 clazz = delegate.resolve(className);
41
42 classCache.put(className, clazz);
43 return clazz;
44 }
45
46 }