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java/org/apache/tomcat/dbcp/pool2/impl/DefaultEvictionPolicy.java

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+/*
+ * 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
+ *
+ *      http://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. Objects will be evicted if the following conditions are met:
+ * <ul>
+ * <li>the object has been idle longer than
+ *     {@link GenericObjectPool#getMinEvictableIdleTimeMillis()} /
+ *     {@link GenericKeyedObjectPool#getMinEvictableIdleTimeMillis()}</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#getSoftMinEvictableIdleTimeMillis()} /
+ *     {@link GenericKeyedObjectPool#getSoftMinEvictableIdleTimeMillis()}
+ * </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> {
+
+    @Override
+    public boolean evict(final EvictionConfig config, final PooledObject<T> underTest,
+            final int idleCount) {
+
+        if ((config.getIdleSoftEvictTime() < underTest.getIdleTimeMillis() &&
+                config.getMinIdle() < idleCount) ||
+                config.getIdleEvictTime() < underTest.getIdleTimeMillis()) {
+            return true;
+        }
+        return false;
+    }
+}