001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.pool2.impl; 018 019import org.apache.commons.pool2.PooledObject; 020 021/** 022 * Provides the default implementation of {@link EvictionPolicy} used by the 023 * pools. Objects will be evicted if the following conditions are met: 024 * <ul> 025 * <li>the object has been idle longer than 026 * {@link GenericObjectPool#getMinEvictableIdleTimeMillis()} / 027 * {@link GenericKeyedObjectPool#getMinEvictableIdleTimeMillis()}</li> 028 * <li>there are more than {@link GenericObjectPool#getMinIdle()} / 029 * {@link GenericKeyedObjectPoolConfig#getMinIdlePerKey()} idle objects in 030 * the pool and the object has been idle for longer than 031 * {@link GenericObjectPool#getSoftMinEvictableIdleTimeMillis()} / 032 * {@link GenericKeyedObjectPool#getSoftMinEvictableIdleTimeMillis()} 033 * </ul> 034 * <p> 035 * This class is immutable and thread-safe. 036 * </p> 037 * 038 * @param <T> the type of objects in the pool 039 * 040 * @since 2.0 041 */ 042public class DefaultEvictionPolicy<T> implements EvictionPolicy<T> { 043 044 @Override 045 public boolean evict(final EvictionConfig config, final PooledObject<T> underTest, 046 final int idleCount) { 047 048 if ((config.getIdleSoftEvictTime() < underTest.getIdleTimeMillis() && 049 config.getMinIdle() < idleCount) || 050 config.getIdleEvictTime() < underTest.getIdleTimeMillis()) { 051 return true; 052 } 053 return false; 054 } 055}