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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 Standard Edition of the LDAP SDK, which is a complete, general-purpose library for communicating with LDAPv3 directory servers.

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/*
 * Copyright 2007-2021 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright 2007-2021 Ping Identity Corporation
 *
 * Licensed 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.
 */
/*
 * Copyright (C) 2007-2021 Ping Identity Corporation
 *
 * 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 com.unboundid.util.Debug;
import com.unboundid.util.NotNull;
import com.unboundid.util.Nullable;



/**
 * 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.
  @NotNull private final AtomicBoolean stopRequested;

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

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

  // A reference to the thread used to perform the periodic health checks.
  @Nullable 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(
       @NotNull 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 (final Exception e)
        {
          Debug.debugException(e);
        }

        try
        {
          pool.getHealthCheck().performPoolMaintenance(pool);
        }
        catch (final Exception e)
        {
          Debug.debugException(e);
        }

        lastCheckTime = System.currentTimeMillis();
      }
      else
      {
        final long sleepTime = Math.min(
             (pool.getHealthCheckIntervalMillis() - timeSinceLastCheck),
             30_000L);
        try
        {
          queue.poll(sleepTime, TimeUnit.MILLISECONDS);
        }
        catch (final Exception e)
        {
          Debug.debugException(e);
        }
      }
    }

    thread = null;
  }



  /**
   * Indicates that this health check thread should stop running.
   *
   * @param  wait  Indicates whether to wait for the thread to actually stop
   *               running before returning.  If this is {@code true}, then this
   *               method will not return until the thread has actually stopped.
   *               If this is {@code false}, then the thread will be signaled
   *               to stop, but the thread may still be running when this method
   *               returns.
   */
  void stopRunning(final boolean wait)
  {
    stopRequested.set(true);
    wakeUp();

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