beagled/FileAttributesStore.cs

   1 //
   2 // FileAttributesStore.cs
   3 //
   4 // Copyright (C) 2005 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a copy
   9 // of this software and associated documentation files (the "Software"), to deal
  10 // in the Software without restriction, including without limitation the rights
  11 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12 // copies of the Software, and to permit persons to whom the Software is
  13 // furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in all
  16 // copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24 // SOFTWARE.
  25 //
  26
  27 using System;
  28
  29 using Beagle.Util;
  30
  31 namespace Beagle.Daemon {
  32
  33         public class FileAttributesStore {
  34
  35                 private IFileAttributesStore ifas;
  36
  37                 public FileAttributesStore (IFileAttributesStore ifas)
  38                 {
  39                         this.ifas = ifas;
  40                 }
  41
  42                 public FileAttributes Read (string path)
  43                 {
  44                         lock (ifas) {
  45                                 return ifas.Read (path);
  46                         }
  47                 }
  48
  49                 public FileAttributes ReadOrCreate (string path, Guid unique_id, out bool created)
  50                 {
  51                         lock (ifas) {
  52                                 created = false;
  53
  54                                 FileAttributes attr = ifas.Read (path);
  55                                 // If we pass in a Guid that doesn't match the one we found in the
  56                                 // the attributes, clobber the old attributes and the old unique Guid.
  57                                 if (attr == null
  58                                     || (unique_id != Guid.Empty && unique_id != attr.UniqueId)) {
  59                                         attr = new FileAttributes ();
  60                                         attr.UniqueId = unique_id;
  61                                         attr.Path = path;
  62                                         // First drop the old attribute
  63                                         if (attr != null)
  64                                                 ifas.Drop (path);
  65                                         // Now add the new attribute
  66                                         ifas.Write (attr);
  67                                         created = true;
  68                                 }
  69                                 return attr;
  70                         }
  71                 }
  72
  73                 public FileAttributes ReadOrCreate (string path, Guid unique_id)
  74                 {
  75                         bool dummy;
  76                         return ReadOrCreate (path, unique_id, out dummy);
  77                 }
  78
  79                 public FileAttributes ReadOrCreate (string path)
  80                 {
  81                         return ReadOrCreate (path, Guid.NewGuid ());
  82                 }
  83
  84                 public bool Write (FileAttributes attr)
  85                 {
  86                         lock (ifas) {
  87                                 attr.LastAttrTime = DateTime.UtcNow;
  88                                 return ifas.Write (attr);
  89                         }
  90                 }
  91
  92                 public void Drop (string path)
  93                 {
  94                         lock (ifas) {
  95                                 ifas.Drop (path);
  96                         }
  97                 }
  98
  99                 public void BeginTransaction ()
 100                 {
 101                         lock (ifas)
 102                                 ifas.BeginTransaction ();
 103
 104                 }
 105
 106                 public void CommitTransaction ()
 107                 {
 108                         lock (ifas)
 109                                 ifas.CommitTransaction ();
 110                 }
 111
 112                 //////////////////////////////////////////////////////////
 113
 114                 public bool IsUpToDate (string path, Filter filter)
 115                 {
 116                         FileAttributes attr;
 117
 118                         attr = Read (path);
 119
 120                         // If there are no attributes set on the file, there is no
 121                         // way that we can be up-to-date.
 122                         if (attr == null)
 123                                 return false;
 124
 125                         // Note that when filter is set to null, we ignore
 126                         // any existing filter data.  That might not be the
 127                         // expected behavior...
 128                         if (filter != null) {
 129
 130                                 if (! attr.HasFilterInfo)
 131                                         return false;
 132
 133                                 if (attr.FilterName != filter.Name)
 134                                         return false;
 135
 136                                 // FIXME: Obviously we want to reindex if
 137                                 // attr.FilterVersion < filter.Version.
 138                                 // But what if the filter we would use is older
 139                                 // than the one that was previously used?
 140                                 if (attr.FilterVersion != filter.Version)
 141                                         return false;
 142                         }
 143
 144                         if (FileSystem.GetLastWriteTimeUtc (path) > attr.LastWriteTime)
 145                                 return false;
 146
 147                         return true;
 148                 }
 149
 150                 public bool IsUpToDate (string path)
 151                 {
 152                         return IsUpToDate (path, null);
 153                 }
 154
 155                 //////////////////////////////////////////////////////////
 156
 157                 // A convenience routine.
 158                 public void AttachLastWriteTime (string path, DateTime mtime)
 159                 {
 160                         FileAttributes attr = ReadOrCreate (path);
 161                         attr.LastWriteTime = mtime;
 162                         if (! Write (attr))
 163                                 Logger.Log.Warn ("Couldn't store file attributes for {0}", path);
 164                 }
 165         }
 166 }