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    • com.unboundid.ldap.sdk.LDAPConnectionPoolHealthCheckThread Maven / Gradle / Ivy

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    The UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use Java API for communicating with LDAP directory servers and performing related tasks like reading and writing LDIF, encoding and decoding data using base64 and ASN.1 BER, and performing secure communication. This package contains the Commercial Edition of the LDAP SDK, which includes all of the general-purpose functionality contained in the Standard Edition, plus additional functionality specific to UnboundID server products.

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    /*
 * Copyright 2007-2017 UnboundID Corp.
 * All Rights Reserved.
 */
/*
 * Copyright (C) 2008-2017 UnboundID Corp.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (GPLv2 only)
 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see .
 */
package com.unboundid.ldap.sdk;



import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import static com.unboundid.util.Debug.*;



/**
 * This class defines a background thread that will be used to periodically
 * check the health of available connections in a connection pool.
 */
class LDAPConnectionPoolHealthCheckThread
      extends Thread
{
  // Indicates whether a request has been made to shut down this health check
  // thread.
  private final AtomicBoolean stopRequested;

  // The connection pool with which this thread is associated.
  private final AbstractConnectionPool pool;

  // A blocking queue used to control sleeping between checks and to wait for a
  // shutdown signal.
  private final LinkedBlockingQueue queue;

  // A reference to the thread used to perform the periodic health checks.
  private volatile Thread thread;



  /**
   * Creates a new instance of this health check thread that will be used to
   * examine connections in the provided pool.
   *
   * @param  pool  The connection pool with which this thread will be
   *               associated.
   */
  LDAPConnectionPoolHealthCheckThread(final AbstractConnectionPool pool)
  {
    setName("Health Check Thread for " + pool.toString());
    setDaemon(true);

    this.pool = pool;

    stopRequested = new AtomicBoolean(false);
    queue = new LinkedBlockingQueue(1);
    thread = null;
  }



  /**
   * Periodically tests the health of available connections in the pool.
   */
  @Override()
  public void run()
  {
    thread = Thread.currentThread();
    long lastCheckTime = System.currentTimeMillis();

    while (! stopRequested.get())
    {
      final long timeSinceLastCheck =
           System.currentTimeMillis() - lastCheckTime;
      if (timeSinceLastCheck >= pool.getHealthCheckIntervalMillis())
      {
        try
        {
          pool.doHealthCheck();
        }
        catch (Exception e)
        {
          debugException(e);
        }
        lastCheckTime = System.currentTimeMillis();
      }
      else
      {
        final long sleepTime = Math.min(
             (pool.getHealthCheckIntervalMillis() - timeSinceLastCheck),
             30000L);
        try
        {
          queue.poll(sleepTime, TimeUnit.MILLISECONDS);
        }
        catch (Exception e)
        {
          debugException(e);
        }
      }
    }

    thread = null;
  }



  /**
   * Indicates that this health check thread should stop running.  This method
   * will not return until the thread has stopped running.
   */
  void stopRunning()
  {
    stopRequested.set(true);
    wakeUp();

    final Thread t = thread;
    if (t != null)
    {
      try
      {
        t.join();
      }
      catch (Exception e)
      {
        debugException(e);

        if (e instanceof InterruptedException)
        {
          Thread.currentThread().interrupt();
        }
      }
    }
  }



  /**
   * Indicates that this health check thread should wake up if it is currently
   * sleeping and check to see if the pool configuration has changed or if a
   * shutdown request has been received.
   */
  void wakeUp()
  {
    queue.offer(new Object());
  }
}
    
    
    
    

    




    
    
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