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.tomcat.dbcp.pool2.impl;
18
19 import org.apache.tomcat.dbcp.pool2.PooledObject;
20
21 /**
22 * Provides the default implementation of {@link EvictionPolicy} used by the
23 * pools. Objects will be evicted if the following conditions are met:
24 * <ul>
25 * <li>the object has been idle longer than
26 * {@link GenericObjectPool#getMinEvictableIdleTimeMillis()} /
27 * {@link GenericKeyedObjectPool#getMinEvictableIdleTimeMillis()}</li>
28 * <li>there are more than {@link GenericObjectPool#getMinIdle()} /
29 * {@link GenericKeyedObjectPoolConfig#getMinIdlePerKey()} idle objects in
30 * the pool and the object has been idle for longer than
31 * {@link GenericObjectPool#getSoftMinEvictableIdleTimeMillis()} /
32 * {@link GenericKeyedObjectPool#getSoftMinEvictableIdleTimeMillis()}
33 * </ul>
34 * <p>
35 * This class is immutable and thread-safe.
36 * </p>
37 *
38 * @param <T> the type of objects in the pool
39 *
40 * @since 2.0
41 */
42 public class DefaultEvictionPolicy<T> implements EvictionPolicy<T> {
43
44 @Override
45 public boolean evict(final EvictionConfig config, final PooledObject<T> underTest,
46 final int idleCount) {
47
48 if ((config.getIdleSoftEvictTime() < underTest.getIdleTimeMillis() &&
49 config.getMinIdle() < idleCount) ||
50 config.getIdleEvictTime() < underTest.getIdleTimeMillis()) {
51 return true;
52 }
53 return false;
54 }
55 }
56