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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
  * 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.commons.pool.impl;

Provides a shared idle object eviction timer for all pools. This class wraps the standard java.util.Timer and keeps track of how many pools are using it. If no pools are using the timer, it is canceled. This prevents a thread being left running which, in application server environments, can lead to memory leads and/or prevent applications from shutting down or reloading cleanly.

This class has package scope to prevent its inclusion in the pool public API. The class declaration below should *not* be changed to public.

 class EvictionTimer {
Timer instance
     private static Timer _timer//@GuardedBy("this")
Static usage count tracker
     private static int _usageCount//@GuardedBy("this")
Prevent instantiation
     private EvictionTimer() {
         // Hide the default constuctor

Add the specified eviction task to the timer. Tasks that are added with a call to this method *must* call cancel(java.util.TimerTask) to cancel the task to prevent memory and/or thread leaks in application server environments.

task Task to be scheduled
delay Delay in milliseconds before task is executed
period Time in milliseconds between executions
     static synchronized void schedule(TimerTask tasklong delaylong period) {
         if (null == ) {
             // Force the new Timer thread to be created with a context class
             // loader set to the class loader that loaded this library
             ClassLoader ccl = AccessController.doPrivileged(
                     new PrivilegedGetTccl());
             try {
                 AccessController.doPrivileged(new PrivilegedSetTccl(
                  = new Timer(true);
             } finally {
                 AccessController.doPrivileged(new PrivilegedSetTccl(ccl));

Remove the specified eviction task from the timer.

task Task to be scheduled
     static synchronized void cancel(TimerTask task) {
         if ( == 0) {
              = null;
 used to get the ContextClassLoader
     private static class PrivilegedGetTccl implements PrivilegedAction<ClassLoader> {

        public ClassLoader run() {
            return Thread.currentThread().getContextClassLoader();
    } used to set the ContextClassLoader
    private static class PrivilegedSetTccl implements PrivilegedAction<ClassLoader> {

        private final ClassLoader cl;

Create a new PrivilegedSetTccl using the given classloader

cl ClassLoader to use
        PrivilegedSetTccl(ClassLoader cl) {
            this. = cl;

        public ClassLoader run() {
            return null;
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