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org.apache.jetspeed.components.interceptors.AbstractCacheInterceptor	0%	0%

1		/*
2		* Licensed to the Apache Software Foundation (ASF) under one or more
3		* contributor license agreements. See the NOTICE file distributed with
4		* this work for additional information regarding copyright ownership.
5		* The ASF licenses this file to You under the Apache License, Version 2.0
6		* (the "License"); you may not use this file except in compliance with
7		* the License. You may obtain a copy of the License at
8		*
9		* http://www.apache.org/licenses/LICENSE-2.0
10		*
11		* Unless required by applicable law or agreed to in writing, software
12		* distributed under the License is distributed on an "AS IS" BASIS,
13		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14		* See the License for the specific language governing permissions and
15		* limitations under the License.
16		*/
17		package org.apache.jetspeed.components.interceptors;
18
19		import java.lang.reflect.Method;
20
21		import org.aopalliance.aop.Advice;
22		import org.aopalliance.intercept.Interceptor;
23		import org.aopalliance.intercept.MethodInterceptor;
24		import org.aopalliance.intercept.MethodInvocation;
25		import org.apache.jetspeed.cache.general.GeneralCache;
26
27		/**
28		* <p>
29		* AbstractCacheInterceptor
30		* </p>
31		* <p>
32		*
33		* </p>
34		* @author <a href="mailto:weaver@apache.org">Scott T. Weaver</a>
35		* @version $Id: AbstractCacheInterceptor.java 516448 2007-03-09 16:25:47Z ate $
36		*
37		*/
38		public abstract class AbstractCacheInterceptor implements Interceptor, MethodInterceptor, Advice
39		{
40
41		protected GeneralCache cache;
42		protected String uniquePrefix;
43
44		/**
45		*
46		*/
47		public AbstractCacheInterceptor( GeneralCache cache, String uniquePrefix )
48		{
49	0	super();
50	0	this.cache = cache;
51	0	this.uniquePrefix = uniquePrefix;
52	0	}
53
54		/**
55		*
56		* @param cache
57		*/
58		public AbstractCacheInterceptor( GeneralCache cache )
59		{
60	0	this(cache, null);
61	0	}
62
63
64		/**
65		*
66		* <p>
67		* buildKey
68		* </p>
69		*
70		* @param clazz
71		* @param method
72		* @param arg0
73		* @return
74		*/
75		public static final String buildKey( String uniquePrefix, String arg0 )
76		{
77	0	return uniquePrefix + ":" + arg0 ;
78		}
79
80
81		/**
82		*
83		* <p>
84		* invoke
85		* </p>
86		*
87		* @see org.aopalliance.intercept.MethodInterceptor#invoke(org.aopalliance.intercept.MethodInvocation)
88		* @param mi
89		* @return
90		* @throws Throwable
91		*/
92		public Object invoke( MethodInvocation mi ) throws Throwable
93		{
94	0	Object[] args = mi.getArguments();
95	0	Method method = mi.getMethod();
96	0	if (args == null)
97		{
98	0	throw new IllegalArgumentException(method.getDeclaringClass() + "." + method.getName()
99		+ "() receives no arguments. "
100		+ "CacheInterceptor can only intercept methods that have at least (1) argument.");
101		}
102
103	0	Object arg0 = args[0];
104	0	if(arg0 == null)
105		{
106	0	throw new IllegalArgumentException("CacheInterceptor requires that the first argument passed to a cached be non-null");
107		}
108
109	0	String prefix = null;
110	0	if(uniquePrefix != null)
111		{
112	0	prefix = buildKey(uniquePrefix, arg0.toString());
113		}
114		else
115		{
116	0	prefix = buildKey(mi.getMethod().getDeclaringClass().getName(), arg0.toString());
117		}
118
119	0	return doCacheOperation(mi, prefix);
120		}
121
122		protected abstract Object doCacheOperation( MethodInvocation mi, String uniqueKey ) throws Throwable;
123
124		}

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