1 /*
   2  * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.jndi.ldap.pool;
  27 
  28 /**
  29  * Thread that wakes up periodically and closes expired, unused connections.
  30  *
  31  * @author Rosanna Lee
  32  */
  33 final public class PoolCleaner extends Thread {
  34     final private Pool[] pools;
  35     final private long period;
  36 
  37     /**
  38      * @param period ms to wait between cleaning
  39      * @param pools non-null array of Pools to clean
  40      */
  41     public PoolCleaner(long period, Pool[] pools) {
  42         super();
  43         this.period = period;
  44         this.pools = pools.clone();
  45         setDaemon(true);
  46     }
  47 
  48     public void run() {
  49         long threshold;
  50         while (true) {
  51             synchronized (this) {
  52                 // Wait for duration of period ms
  53                 try {
  54                     wait(period);
  55                 } catch (InterruptedException ignore) {
  56                 }
  57 
  58                 // Connections idle since threshold have expired
  59                 threshold = System.currentTimeMillis() - period;
  60                 for (int i = 0; i < pools.length; i++) {
  61                     if (pools[i] != null) {
  62                         pools[i].expire(threshold);
  63                     }
  64                 }
  65             }
  66         }
  67     }
  68 }