Line data    Source code

       1             : #region Copyright
       2             : // // -----------------------------------------------------------------------
       3             : // // <copyright company="Chinchilla Software Limited">
       4             : // //   Copyright Chinchilla Software Limited. All rights reserved.
       5             : // // </copyright>
       6             : // // -----------------------------------------------------------------------
       7             : #endregion
       8             : 
       9             : using System;
      10             : using System.IO;
      11             : using Cqrs.Configuration;
      12             : 
      13             : namespace Cqrs.Bus
      14             : {
      15             :         /// <summary>
      16             :         /// Indicates the position in a store where the stream has been read up to by storing the value in a file.
      17             :         /// </summary>
      18             :         public class FileBasedLastEventProcessedStore : IStoreLastEventProcessed
      19           1 :         {
      20             :                 /// <summary>
      21             :                 /// The configuration setting that holds the location of file to store position information in.
      22             :                 /// </summary>
      23             :                 public const string AppSettingsKey = "Cqrs.FileBasedLastEventProcessed.Location";
      24             : 
      25             :                 /// <summary>
      26             :                 /// The default location of the file to store position information in.
      27             :                 /// </summary>
      28             :                 public const string AppSettingsDefaultValue = @"%EVENTSTORE_HOME%\LastEventProcessedLocation";
      29             : 
      30             :                 /// <summary>
      31             :                 /// The relative or absolute path of the file to store the current location in
      32             :                 /// </summary>
      33             :                 protected string FileName { get; private set; }
      34             : 
      35             :                 /// <summary>
      36             :                 /// Instantiates a new instance of <see cref="FileBasedLastEventProcessedStore"/>.
      37             :                 /// </summary>
      38           1 :                 public FileBasedLastEventProcessedStore(IConfigurationManager configurationManager)
      39             :                 {
      40             :                         string location = configurationManager.GetSetting(AppSettingsKey);
      41             :                         if (string.IsNullOrEmpty(location))
      42             :                         {
      43             :                                 location = AppSettingsDefaultValue;
      44             :                         }
      45             : 
      46             :                         FileName = Environment.ExpandEnvironmentVariables(location);
      47             :                 }
      48             : 
      49             :                 /// <summary>
      50             :                 /// Reads and writes the location within the store where the stream has been read up to <see cref="FileName"/>.
      51             :                 /// </summary>
      52             :                 public string EventLocation
      53             :                 {
      54             :                         get
      55             :                         {
      56             :                                 return File.Exists(FileName) ? File.ReadAllText(FileName) : string.Empty;
      57             :                         }
      58             : 
      59             :                         set
      60             :                         {
      61             :                                 File.WriteAllText(FileName, value);
      62             :                         }
      63             :                 }
      64             :         }
      65             : }