FileWatcherConfigurationService.cs :  » Build-Systems » CruiseControl.NET » ThoughtWorks » CruiseControl » Core » Config » C# / CSharp Open Source

using System;
using System.IO;
using ThoughtWorks.CruiseControl.Core.Util;

namespace ThoughtWorks.CruiseControl.Core.Config{
  // ToDo - make disposable?  need to ensure that the filewatcher is disposed.  should be done in container.
  public class FileWatcherConfigurationService : IConfigurationService
  {
    private readonly IConfigurationService decoratedService;
    private readonly IFileWatcher fileWatcher;
    private ConfigurationUpdateHandler updateHandler;
      private ConfigurationSubfileLoadedHandler subfileHandler;

    public FileWatcherConfigurationService(IConfigurationService decoratedService, IFileWatcher fileWatcher)
    {
      this.decoratedService = decoratedService;
      this.fileWatcher = fileWatcher;
      this.fileWatcher.OnFileChanged += new FileSystemEventHandler(HandleConfigurationFileChanged);
        decoratedService.AddConfigurationSubfileLoadedHandler( SubfileLoaded );
    }

      public IConfiguration Load()
    {
      return decoratedService.Load();
    }

      private void SubfileLoaded (string path)
      {
          fileWatcher.AddWatcher( path );
      }

      public void Save(IConfiguration configuration)
    {
      decoratedService.Save(configuration);
    }

    public void AddConfigurationUpdateHandler(ConfigurationUpdateHandler handler)
    {
      updateHandler += handler;
    }

      public void AddConfigurationSubfileLoadedHandler (
          ConfigurationSubfileLoadedHandler handler)
      {
          subfileHandler += handler;          
      }

      private void HandleConfigurationFileChanged(object source, FileSystemEventArgs args)
    {
      try
      {
        lock (this)
        {
          if (updateHandler != null)
          {
            updateHandler();
          }
        }
      }
      catch (Exception ex) 
      {
        Log.Error(ex);
      }
    }  
  }
}