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| org.apache.jetspeed.components.interceptors.CachingInterceptor |
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| 1 | /* |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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| 3 | * contributor license agreements. See the NOTICE file distributed with |
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| 4 | * this work for additional information regarding copyright ownership. |
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| 5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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| 6 | * (the "License"); you may not use this file except in compliance with |
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| 7 | * the License. You may obtain a copy of the License at |
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| 8 | * |
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| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 10 | * |
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| 11 | * Unless required by applicable law or agreed to in writing, software |
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| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 14 | * See the License for the specific language governing permissions and |
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| 15 | * limitations under the License. |
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| 16 | */ |
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| 17 | package org.apache.jetspeed.components.interceptors; |
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| 18 | ||
| 19 | import org.aopalliance.intercept.MethodInvocation; |
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| 20 | import org.apache.jetspeed.cache.general.GeneralCache; |
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| 21 | ||
| 22 | /** |
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| 23 | * <p> |
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| 24 | * CacheInterceptor |
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| 25 | * </p> |
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| 26 | * <p> |
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| 27 | * AoP Interceptor that can be used for generalized caching. The only requirement is |
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| 28 | * that intercepted methods must receive at least one (1) arguments. |
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| 29 | * <br /> <br /> |
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| 30 | * CacheInterceptor ALWAYS use the first argument in the method to build the unique cache key. |
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| 31 | * </p> |
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| 32 | * |
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| 33 | * @author <a href="mailto:weaver@apache.org">Scott T. Weaver </a> |
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| 34 | * @version $Id: CachingInterceptor.java 516448 2007-03-09 16:25:47Z ate $ |
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| 35 | * |
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| 36 | */ |
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| 37 | public class CachingInterceptor extends AbstractCacheInterceptor |
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| 38 | { |
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| 39 | ||
| 40 | ||
| 41 | ||
| 42 | /** |
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| 43 | * @param cache |
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| 44 | */ |
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| 45 | public CachingInterceptor( GeneralCache cache ) |
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| 46 | { |
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| 47 | 0 | super(cache); |
| 48 | 0 | } |
| 49 | ||
| 50 | /** |
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| 51 | * <p> |
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| 52 | * doCacheOperation |
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| 53 | * </p> |
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| 54 | * |
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| 55 | * @param mi |
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| 56 | * @param uniqueKey |
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| 57 | * @return |
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| 58 | * @throws Throwable |
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| 59 | */ |
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| 60 | protected Object doCacheOperation( MethodInvocation mi, String uniqueKey ) throws Throwable |
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| 61 | { |
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| 62 | 0 | if(cache.contains(uniqueKey)) |
| 63 | { |
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| 64 | 0 | return cache.get(uniqueKey); |
| 65 | } |
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| 66 | else |
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| 67 | { |
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| 68 | 0 | Object value = mi.proceed(); |
| 69 | 0 | if(value != null) |
| 70 | { |
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| 71 | 0 | cache.put(uniqueKey, value); |
| 72 | } |
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| 73 | ||
| 74 | 0 | return value; |
| 75 | } |
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| 76 | } |
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| 77 | } |
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