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.commons.pool2.impl; 18 19 import org.apache.commons.pool2.PooledObject; 20 21 /** 22 * Provides the default implementation of {@link EvictionPolicy} used by the pools. 23 * <p> 24 * Objects will be evicted if the following conditions are met: 25 * </p> 26 * <ul> 27 * <li>The object has been idle longer than 28 * {@link GenericObjectPool#getMinEvictableIdleDuration()} / 29 * {@link GenericKeyedObjectPool#getMinEvictableIdleDuration()}</li> 30 * <li>There are more than {@link GenericObjectPool#getMinIdle()} / 31 * {@link GenericKeyedObjectPoolConfig#getMinIdlePerKey()} idle objects in 32 * the pool and the object has been idle for longer than 33 * {@link GenericObjectPool#getSoftMinEvictableIdleDuration()} / 34 * {@link GenericKeyedObjectPool#getSoftMinEvictableIdleDuration()} 35 * </ul> 36 * <p> 37 * This class is immutable and thread-safe. 38 * </p> 39 * 40 * @param <T> the type of objects in the pool. 41 * 42 * @since 2.0 43 */ 44 public class DefaultEvictionPolicy<T> implements EvictionPolicy<T> { 45 46 @Override 47 public boolean evict(final EvictionConfig config, final PooledObject<T> underTest, final int idleCount) { 48 // @formatter:off 49 return config.getIdleSoftEvictDuration().compareTo(underTest.getIdleDuration()) < 0 && 50 config.getMinIdle() < idleCount || 51 config.getIdleEvictDuration().compareTo(underTest.getIdleDuration()) < 0; 52 // @formatter:on 53 } 54 }