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org.apache.jcs.auxiliary.disk.jdbc.mysql.MySQLDiskCache	47%	67%

1		package org.apache.jcs.auxiliary.disk.jdbc.mysql;
2
3		/*
4		* Licensed to the Apache Software Foundation (ASF) under one
5		* or more contributor license agreements. See the NOTICE file
6		* distributed with this work for additional information
7		* regarding copyright ownership. The ASF licenses this file
8		* to you under the Apache License, Version 2.0 (the
9		* "License"); you may not use this file except in compliance
10		* with the License. You may obtain a copy of the License at
11		*
12		* http://www.apache.org/licenses/LICENSE-2.0
13		*
14		* Unless required by applicable law or agreed to in writing,
15		* software distributed under the License is distributed on an
16		* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17		* KIND, either express or implied. See the License for the
18		* specific language governing permissions and limitations
19		* under the License.
20		*/
21
22		import java.io.Serializable;
23
24		import org.apache.commons.logging.Log;
25		import org.apache.commons.logging.LogFactory;
26		import org.apache.jcs.auxiliary.disk.jdbc.JDBCDiskCache;
27		import org.apache.jcs.auxiliary.disk.jdbc.TableState;
28		import org.apache.jcs.engine.behavior.ICacheElement;
29
30		/**
31		* The MySQLDiskCache extends the core JDBCDiskCache.
32		* <p>
33		* Although the generic JDBC Disk Cache can be used for MySQL, the MySQL JDBC Disk Cache has
34		* additional features, such as table optimization that are particular to MySQL.
35		* <p>
36		* @author Aaron Smuts
37		*/
38		public class MySQLDiskCache
39		extends JDBCDiskCache
40		{
41		private static final long serialVersionUID = -7169488308515823491L;
42
43	28	private final static Log log = LogFactory.getLog( MySQLDiskCache.class );
44
45		MySQLDiskCacheAttributes mySQLDiskCacheAttributes;
46
47		/**
48		* Delegates to the super and makes use of the MySQL specific parameters used for scheduled
49		* optimization.
50		* <p>
51		* @param attributes
52		* @param tableState
53		*/
54		public MySQLDiskCache( MySQLDiskCacheAttributes attributes, TableState tableState )
55		{
56	14	super( attributes, tableState );
57
58	14	mySQLDiskCacheAttributes = attributes;
59
60	14	if ( log.isDebugEnabled() )
61		{
62	0	log.debug( "MySQLDiskCacheAttributes = " + attributes );
63		}
64	14	}
65
66		/**
67		* This delegates to the generic JDBC disk cache. If we are currently optimizing, then this
68		* method will balk and return null.
69		* <p>
70		* @param key Key to locate value for.
71		* @return An object matching key, or null.
72		*/
73		public ICacheElement doGet( Serializable key )
74		{
75	224	if ( this.getTableState().getState() == TableState.OPTIMIZATION_RUNNING )
76		{
77	7	if ( this.mySQLDiskCacheAttributes.isBalkDuringOptimization() )
78		{
79	7	return null;
80		}
81		}
82	217	return super.doGet( key );
83		}
84
85		/**
86		* This delegates to the generic JDBC disk cache. If we are currently optimizing, then this
87		* method will balk and do nothing.
88		* <p>
89		* @param element
90		*/
91		public void doUpdate( ICacheElement element )
92		{
93	0	if ( this.getTableState().getState() == TableState.OPTIMIZATION_RUNNING )
94		{
95	0	if ( this.mySQLDiskCacheAttributes.isBalkDuringOptimization() )
96		{
97	0	return;
98		}
99		}
100	0	super.doUpdate( element );
101	0	}
102
103		/**
104		* Removed the expired. (now - create time) > max life seconds * 1000
105		* <p>
106		* If we are currently optimizing, then this method will balk and do nothing.
107		* <p>
108		* TODO consider blocking and trying again.
109		* <p>
110		* @return the number deleted
111		*/
112		protected int deleteExpired()
113		{
114	0	if ( this.getTableState().getState() == TableState.OPTIMIZATION_RUNNING )
115		{
116	0	if ( this.mySQLDiskCacheAttributes.isBalkDuringOptimization() )
117		{
118	0	return -1;
119		}
120		}
121	0	return super.deleteExpired();
122		}
123		}

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