/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.dbcp.pool2.impl;
import org.apache.tomcat.dbcp.pool2.PooledObject;
/**
* Provides the default implementation of {@link EvictionPolicy} used by the pools.
* <p>
* Objects will be evicted if the following conditions are met:
* </p>
* <ul>
* <li>The object has been idle longer than
* {@link GenericObjectPool#getMinEvictableIdleDuration()} /
* {@link GenericKeyedObjectPool#getMinEvictableIdleDuration()}</li>
* <li>There are more than {@link GenericObjectPool#getMinIdle()} /
* {@link GenericKeyedObjectPoolConfig#getMinIdlePerKey()} idle objects in
* the pool and the object has been idle for longer than
* {@link GenericObjectPool#getSoftMinEvictableIdleDuration()} /
* {@link GenericKeyedObjectPool#getSoftMinEvictableIdleDuration()}</li>
* </ul>
* <p>
* This class is immutable and thread-safe.
* </p>
*
* @param <T> the type of objects in the pool.
* @since 2.0
*/
public class DefaultEvictionPolicy<T> implements EvictionPolicy<T> {
/**
* Constructs a new instance.
*/
public DefaultEvictionPolicy() {
// empty
}
@Override
public boolean evict(final EvictionConfig config, final PooledObject<T> underTest, final int idleCount) {
// @formatter:off
return config.getIdleSoftEvictDuration().compareTo(underTest.getIdleDuration()) < 0 &&
config.getMinIdle() < idleCount ||
config.getIdleEvictDuration().compareTo(underTest.getIdleDuration()) < 0;
// @formatter:on
}
}