JobHandler.cs :  » Persistence-Frameworks » ORM.NET » OrmLib » C# / CSharp Open Source

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C# / CSharp Open Source » Persistence Frameworks » ORM.NET 
ORM.NET » OrmLib » JobHandler.cs
//This file is part of ORM.NET.
//
//ORM.NET is free software; you can redistribute it and/or
//modify it under the terms of the GNU Lesser General Public
//License as published by the Free Software Foundation; either
//version 2.1 of the License, or (at your option) any later version.
//
//ORM.NET 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
//Lesser General Public License for more details.
//
//You should have received a copy of the GNU Lesser General Public
//License along with ORM.NET; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


using System;
using System.Threading;
using System.Collections;
using System.ComponentModel;

namespace OrmLib{
  /// <summary>
  /// Inherit from this to create jobs that run as a service, in multiple threads, repeatedly.
  /// </summary>
  [EditorBrowsable(EditorBrowsableState.Never)]
  abstract public class Job
  {
    /// <summary>
    /// Unique identifier.
    /// </summary>
    public Guid JobId = Guid.NewGuid();
    /// <summary>
    /// Must orerride this, all your code will go here.
    /// </summary>
    /// <returns>Whether to cal DoJob again.</returns>
    abstract public bool DoJob();
  }
  
  /// <summary>
  /// Runs <seealso cref="Job"/>s
  /// </summary>
  [EditorBrowsable(EditorBrowsableState.Never)]
  public class JobHandler
  {
    private long NumActiveThreads = 0;
    private ManualResetEvent ExitEvent = new ManualResetEvent(false);
    public ManualResetEvent LastThreadEvent = new ManualResetEvent(false);
    private int LoopInterval = 1000;

    public JobHandler()
    {
      LoopInterval = 1000;
    }

    public JobHandler(int loopInterval)
    {
      LoopInterval = loopInterval;
    }

    public void JobCallback( Object state )
    {
      System.Threading.Interlocked.Increment( ref NumActiveThreads );
      do
      {
        bool bContinue = ((Job)state).DoJob();
        if (!bContinue) break;
      } while ( !ExitEvent.WaitOne( LoopInterval, false) );

      long Count = System.Threading.Interlocked.Decrement( ref NumActiveThreads );
      System.Diagnostics.Debug.WriteLine("Thread " + ((Job)state).JobId.ToString() + " quitting");
      if (Count == 0) LastThreadEvent.Set();
    }

    public void AddJob( Job job)
    {
      ThreadPool.QueueUserWorkItem( new WaitCallback( JobCallback), job);
    }

    public long ActiveThreadCount
    {
      get
      {
        return NumActiveThreads;
      }
    }

    public void WaitJobs()
    {
      LastThreadEvent.WaitOne( TimeSpan.MaxValue, false );
    }

    public void StopJobs()
    {
      ExitEvent.Set();
    }
  }
}
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