code.grnet.gr Git - pithos-ms-client/blob - trunk/Pithos.Core/Agents/StatusAgent.cs

   1 #region
   2 /* -----------------------------------------------------------------------
   3  * <copyright file="StatusAgent.cs" company="GRNet">
   4  *
   5  * Copyright 2011-2012 GRNET S.A. All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  *   1. Redistributions of source code must retain the above
  12  *      copyright notice, this list of conditions and the following
  13  *      disclaimer.
  14  *
  15  *   2. Redistributions in binary form must reproduce the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer in the documentation and/or other materials
  18  *      provided with the distribution.
  19  *
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  31  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * The views and conclusions contained in the software and
  35  * documentation are those of the authors and should not be
  36  * interpreted as representing official policies, either expressed
  37  * or implied, of GRNET S.A.
  38  * </copyright>
  39  * -----------------------------------------------------------------------
  40  */
  41 #endregion
  42 using System;
  43 using System.Collections.Generic;
  44 using System.ComponentModel.Composition;
  45 using System.Data.SQLite;
  46 using System.Diagnostics;
  47 using System.Diagnostics.Contracts;
  48 using System.IO;
  49 using System.Linq;
  50 using System.Reflection;
  51 using System.Text;
  52 using System.Threading;
  53 using System.Threading.Tasks;
  54 using Castle.ActiveRecord;
  55 using Castle.ActiveRecord.Framework.Config;
  56 using Pithos.Interfaces;
  57 using Pithos.Network;
  58 using log4net;
  59
  60 namespace Pithos.Core.Agents
  61 {
  62     [Export(typeof(IStatusChecker)),Export(typeof(IStatusKeeper))]
  63     public class StatusAgent:IStatusChecker,IStatusKeeper
  64     {
  65         private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
  66
  67         [System.ComponentModel.Composition.Import]
  68         public IPithosSettings Settings { get; set; }
  69
  70         private Agent<Action> _persistenceAgent;
  71
  72
  73
  74         public StatusAgent()
  75         {
  76             var appDataPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
  77
  78
  79
  80             _pithosDataPath = Path.Combine(appDataPath , "GRNET");
  81             if (!Directory.Exists(_pithosDataPath))
  82                 Directory.CreateDirectory(_pithosDataPath);
  83
  84             var dbPath = Path.Combine(_pithosDataPath, "pithos.db");
  85
  86             MigrateOldDb(dbPath, appDataPath);
  87
  88             var source = GetConfiguration(_pithosDataPath);
  89             ActiveRecordStarter.Initialize(source,typeof(FileState),typeof(FileTag));
  90             ActiveRecordStarter.UpdateSchema();
  91
  92
  93             if (!File.Exists(dbPath))
  94                 ActiveRecordStarter.CreateSchema();
  95
  96             CreateTrigger();
  97
  98         }
  99
 100
 101         private static void MigrateOldDb(string dbPath, string appDataPath)
 102         {
 103             Contract.Requires(!String.IsNullOrWhiteSpace(dbPath));
 104             Contract.Requires(!String.IsNullOrWhiteSpace(appDataPath));
 105
 106             var oldDbPath = Path.Combine(appDataPath, "Pithos", "pithos.db");
 107             var oldDbInfo = new FileInfo(oldDbPath);
 108             if (oldDbInfo.Exists && !File.Exists(dbPath))
 109             {
 110                 var oldDirectory = oldDbInfo.Directory;
 111                 oldDbInfo.MoveTo(dbPath);
 112                 oldDirectory.Delete(true);
 113             }
 114         }
 115
 116         private void CreateTrigger()
 117         {
 118             using (var connection = GetConnection())
 119             using (var triggerCommand = connection.CreateCommand())
 120             {
 121                 var cmdText = new StringBuilder()
 122                     .AppendLine("CREATE TRIGGER IF NOT EXISTS update_last_modified UPDATE ON FileState FOR EACH ROW")
 123                     .AppendLine("BEGIN")
 124                     .AppendLine("UPDATE FileState SET Modified=datetime('now')  WHERE Id=old.Id;")
 125                     .AppendLine("END;")
 126                     .AppendLine("CREATE TRIGGER IF NOT EXISTS insert_last_modified INSERT ON FileState FOR EACH ROW")
 127                     .AppendLine("BEGIN")
 128                     .AppendLine("UPDATE FileState SET Modified=datetime('now')  WHERE Id=new.Id;")
 129                     .AppendLine("END;")
 130                     .ToString();
 131                 triggerCommand.CommandText = cmdText;
 132                 triggerCommand.ExecuteNonQuery();
 133             }
 134         }
 135
 136
 137         private static InPlaceConfigurationSource GetConfiguration(string pithosDbPath)
 138         {
 139             if (String.IsNullOrWhiteSpace(pithosDbPath))
 140                 throw new ArgumentNullException("pithosDbPath");
 141             if (!Path.IsPathRooted(pithosDbPath))
 142                 throw new ArgumentException("path must be a rooted path", "pithosDbPath");
 143             Contract.EndContractBlock();
 144
 145             var properties = new Dictionary<string, string>
 146                                  {
 147                                      {"connection.driver_class", "NHibernate.Driver.SQLite20Driver"},
 148                                      {"dialect", "NHibernate.Dialect.SQLiteDialect"},
 149                                      {"connection.provider", "NHibernate.Connection.DriverConnectionProvider"},
 150                                      {
 151                                          "proxyfactory.factory_class",
 152                                          "NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle"
 153                                          },
 154                                  };
 155
 156             var connectionString = String.Format(@"Data Source={0}\pithos.db;Version=3;Enlist=N", pithosDbPath);
 157             properties.Add("connection.connection_string", connectionString);
 158
 159             var source = new InPlaceConfigurationSource();
 160             source.Add(typeof (ActiveRecordBase), properties);
 161             source.SetDebugFlag(false);
 162             return source;
 163         }
 164
 165         public void StartProcessing(CancellationToken token)
 166         {
 167             _persistenceAgent = Agent<Action>.Start(queue =>
 168             {
 169                 Action loop = null;
 170                 loop = () =>
 171                 {
 172                     var job = queue.Receive();
 173                     job.ContinueWith(t =>
 174                     {
 175                         var action = job.Result;
 176                         try
 177                         {
 178                             action();
 179                         }
 180                         catch (SQLiteException ex)
 181                         {
 182                             Log.ErrorFormat("[ERROR] SQL \n{0}", ex);
 183                         }
 184                         catch (Exception ex)
 185                         {
 186                             Log.ErrorFormat("[ERROR] STATE \n{0}", ex);
 187                         }
 188 // ReSharper disable AccessToModifiedClosure
 189                         queue.DoAsync(loop);
 190 // ReSharper restore AccessToModifiedClosure
 191                     });
 192                 };
 193                 loop();
 194             });
 195
 196         }
 197
 198
 199
 200         public void Stop()
 201         {
 202             _persistenceAgent.Stop();
 203         }
 204
 205
 206         public void ProcessExistingFiles(IEnumerable<FileInfo> existingFiles)
 207         {
 208             if(existingFiles  ==null)
 209                 throw new ArgumentNullException("existingFiles");
 210             Contract.EndContractBlock();
 211
 212             //Find new or matching files with a left join to the stored states
 213             var fileStates = FileState.Queryable;
 214             var currentFiles=from file in existingFiles
 215                       join state in fileStates on file.FullName.ToLower() equals state.FilePath.ToLower() into gs
 216                       from substate in gs.DefaultIfEmpty()
 217                                select new {File = file, State = substate};
 218
 219             //To get the deleted files we must get the states that have no corresponding
 220             //files.
 221             //We can't use the File.Exists method inside a query, so we get all file paths from the states
 222             var statePaths = (from state in fileStates
 223                              select new {state.Id, state.FilePath}).ToList();
 224             //and check each one
 225             var missingStates= (from path in statePaths
 226                                 where !File.Exists(path.FilePath) && !Directory.Exists(path.FilePath)
 227                                select path.Id).ToList();
 228             //Finally, retrieve the states that correspond to the deleted files
 229             var deletedFiles = from state in fileStates
 230                         where missingStates.Contains(state.Id)
 231                         select new { File = default(FileInfo), State = state };
 232
 233             var pairs = currentFiles.Union(deletedFiles);
 234
 235             foreach(var pair in pairs)
 236             {
 237                 var fileState = pair.State;
 238                 var file = pair.File;
 239                 if (fileState == null)
 240                 {
 241                     //This is a new file
 242                     var fullPath = pair.File.FullName;
 243                     var createState = FileState.CreateForAsync(fullPath, BlockSize, BlockHash);
 244                     createState.ContinueWith(state => _persistenceAgent.Post(state.Result.Create));
 245                 }
 246                 else if (file == null)
 247                 {
 248                     //This file was deleted while we were down. We should mark it as deleted
 249                     //We have to go through UpdateStatus here because the state object we are using
 250                     //was created by a different ORM session.
 251                     _persistenceAgent.Post(()=> UpdateStatusDirect(fileState.Id, FileStatus.Deleted));
 252                 }
 253                 else
 254                 {
 255                     //This file has a matching state. Need to check for possible changes
 256                     var hashString = file.CalculateHash(BlockSize,BlockHash);
 257                     //If the hashes don't match the file was changed
 258                     if (fileState.Checksum != hashString)
 259                     {
 260                         _persistenceAgent.Post(() => UpdateStatusDirect(fileState.Id, FileStatus.Modified));
 261                     }
 262                 }
 263             };
 264
 265         }
 266
 267         private int UpdateStatusDirect(Guid id, FileStatus status)
 268         {
 269             using (log4net.ThreadContext.Stacks["StatusAgent"].Push("UpdateStatusDirect"))
 270             {
 271
 272                 try
 273                 {
 274
 275                     using (var connection = GetConnection())
 276                     using (
 277                         var command = new SQLiteCommand("update FileState set FileStatus= :fileStatus where Id = :id  ",
 278                                                         connection))
 279                     {
 280                         command.Parameters.AddWithValue("fileStatus", status);
 281
 282                         command.Parameters.AddWithValue("id", id);
 283
 284                         var affected = command.ExecuteNonQuery();
 285
 286                         return affected;
 287                     }
 288
 289                 }
 290                 catch (Exception exc)
 291                 {
 292                     Log.Error(exc.ToString());
 293                     throw;
 294                 }
 295             }
 296         }
 297
 298         private int UpdateStatusDirect(string path, FileStatus status)
 299         {
 300             using (log4net.ThreadContext.Stacks["StatusAgent"].Push("UpdateStatusDirect"))
 301             {
 302
 303                 try
 304                 {
 305
 306
 307                     using (var connection = GetConnection())
 308                     using (
 309                         var command =
 310                             new SQLiteCommand("update FileState set FileStatus= :fileStatus where FilePath = :path COLLATE NOCASE",
 311                                               connection))
 312                     {
 313
 314
 315                         command.Parameters.AddWithValue("fileStatus", status);
 316
 317                         command.Parameters.AddWithValue("path", path);
 318
 319                         var affected = command.ExecuteNonQuery();
 320                         return affected;
 321                     }
 322                 }
 323                 catch (Exception exc)
 324                 {
 325                     Log.Error(exc.ToString());
 326                     throw;
 327                 }
 328             }
 329         }
 330
 331         private int UpdateStatusDirect(string absolutePath, FileStatus fileStatus, FileOverlayStatus overlayStatus)
 332         {
 333             using (log4net.ThreadContext.Stacks["StatusAgent"].Push("UpdateStatusDirect"))
 334             {
 335
 336                 try
 337                 {
 338
 339
 340                     using (var connection = GetConnection())
 341                     using (
 342                         var command =
 343                             new SQLiteCommand(
 344                                 "update FileState set OverlayStatus= :overlayStatus, FileStatus= :fileStatus where FilePath = :path COLLATE NOCASE ",
 345                                 connection))
 346                     {
 347
 348                         command.Parameters.AddWithValue("path", absolutePath);
 349                         command.Parameters.AddWithValue("fileStatus", fileStatus);
 350                         command.Parameters.AddWithValue("overlayStatus", overlayStatus);
 351
 352                         var affected = command.ExecuteNonQuery();
 353                         return affected;
 354                     }
 355                 }
 356                 catch (Exception exc)
 357                 {
 358                     Log.Error(exc.ToString());
 359                     throw;
 360                 }
 361             }
 362         }
 363
 364
 365
 366         public string BlockHash { get; set; }
 367
 368         public int BlockSize { get; set; }
 369         public void ChangeRoots(string oldPath, string newPath)
 370         {
 371             if (String.IsNullOrWhiteSpace(oldPath))
 372                 throw new ArgumentNullException("oldPath");
 373             if (!Path.IsPathRooted(oldPath))
 374                 throw new ArgumentException("oldPath must be an absolute path", "oldPath");
 375             if (string.IsNullOrWhiteSpace(newPath))
 376                 throw new ArgumentNullException("newPath");
 377             if (!Path.IsPathRooted(newPath))
 378                 throw new ArgumentException("newPath must be an absolute path", "newPath");
 379             Contract.EndContractBlock();
 380
 381             FileState.ChangeRootPath(oldPath,newPath);
 382
 383         }
 384
 385         private PithosStatus _pithosStatus=PithosStatus.InSynch;
 386
 387         public void SetPithosStatus(PithosStatus status)
 388         {
 389             _pithosStatus = status;
 390         }
 391
 392         public PithosStatus GetPithosStatus()
 393         {
 394             return _pithosStatus;
 395         }
 396
 397
 398         private readonly string _pithosDataPath;
 399
 400
 401         public FileState GetStateByFilePath(string path)
 402         {
 403             if (String.IsNullOrWhiteSpace(path))
 404                 throw new ArgumentNullException("path");
 405             if (!Path.IsPathRooted(path))
 406                 throw new ArgumentException("The path must be rooted", "path");
 407             Contract.EndContractBlock();
 408
 409             try
 410             {
 411
 412                 using (var connection = GetConnection())
 413                 using (var command = new SQLiteCommand("select Id, FilePath, OverlayStatus,FileStatus ,Checksum   ,Version    ,VersionTimeStamp,IsShared   ,SharedBy   ,ShareWrite  from FileState where FilePath=:path COLLATE NOCASE", connection))
 414                 {
 415
 416                     command.Parameters.AddWithValue("path", path);
 417
 418                     using (var reader = command.ExecuteReader())
 419                     {
 420                         if (reader.Read())
 421                         {
 422                             //var values = new object[reader.FieldCount];
 423                             //reader.GetValues(values);
 424                             var state = new FileState
 425                                             {
 426                                                 Id = reader.GetGuid(0),
 427                                                 FilePath = reader.IsDBNull(1)?"":reader.GetString(1),
 428                                                 OverlayStatus =reader.IsDBNull(2)?FileOverlayStatus.Unversioned: (FileOverlayStatus) reader.GetInt64(2),
 429                                                 FileStatus = reader.IsDBNull(3)?FileStatus.Missing:(FileStatus) reader.GetInt64(3),
 430                                                 Checksum = reader.IsDBNull(4)?"":reader.GetString(4),
 431                                                 Version = reader.IsDBNull(5)?default(long):reader.GetInt64(5),
 432                                                 VersionTimeStamp = reader.IsDBNull(6)?default(DateTime):reader.GetDateTime(6),
 433                                                 IsShared = !reader.IsDBNull(7) && reader.GetBoolean(7),
 434                                                 SharedBy = reader.IsDBNull(8)?"":reader.GetString(8),
 435                                                 ShareWrite = !reader.IsDBNull(9) && reader.GetBoolean(9)
 436                                             };
 437 /*
 438                             var state = new FileState
 439                                             {
 440                                                 Id = (Guid) values[0],
 441                                                 FilePath = (string) values[1],
 442                                                 OverlayStatus = (FileOverlayStatus) (long)values[2],
 443                                                 FileStatus = (FileStatus) (long)values[3],
 444                                                 Checksum = (string) values[4],
 445                                                 Version = (long?) values[5],
 446                                                 VersionTimeStamp = (DateTime?) values[6],
 447                                                 IsShared = (long)values[7] == 1,
 448                                                 SharedBy = (string) values[8],
 449                                                 ShareWrite = (long)values[9] == 1
 450                                             };
 451 */
 452                             return state;
 453                         }
 454                         else
 455                         {
 456                             return null;
 457                         }
 458
 459                     }
 460                 }
 461             }
 462             catch (Exception exc)
 463             {
 464                 Log.ErrorFormat(exc.ToString());
 465                 throw;
 466             }
 467         }
 468
 469         public FileOverlayStatus GetFileOverlayStatus(string path)
 470         {
 471             if (String.IsNullOrWhiteSpace(path))
 472                 throw new ArgumentNullException("path");
 473             if (!Path.IsPathRooted(path))
 474                 throw new ArgumentException("The path must be rooted", "path");
 475             Contract.EndContractBlock();
 476
 477             try
 478             {
 479
 480                 using (var connection = GetConnection())
 481                 using (var command = new SQLiteCommand("select OverlayStatus from FileState where FilePath=:path  COLLATE NOCASE", connection))
 482                 {
 483
 484                     command.Parameters.AddWithValue("path", path);
 485
 486                     var s = command.ExecuteScalar();
 487                     return (FileOverlayStatus) Convert.ToInt32(s);
 488                 }
 489             }
 490             catch (Exception exc)
 491             {
 492                 Log.ErrorFormat(exc.ToString());
 493                 return FileOverlayStatus.Unversioned;
 494             }
 495         }
 496
 497         private string GetConnectionString()
 498         {
 499             var connectionString = String.Format(@"Data Source={0}\pithos.db;Version=3;Enlist=N;Pooling=True", _pithosDataPath);
 500             return connectionString;
 501         }
 502
 503         private SQLiteConnection GetConnection()
 504         {
 505             var connectionString = GetConnectionString();
 506             var connection = new SQLiteConnection(connectionString);
 507             connection.Open();
 508             using(var cmd =connection.CreateCommand())
 509             {
 510                 cmd.CommandText = "PRAGMA journal_mode=WAL";
 511                 cmd.ExecuteNonQuery();
 512             }
 513             return connection;
 514         }
 515
 516         public void SetFileOverlayStatus(string path, FileOverlayStatus overlayStatus)
 517         {
 518             if (String.IsNullOrWhiteSpace(path))
 519                 throw new ArgumentNullException("path");
 520             if (!Path.IsPathRooted(path))
 521                 throw new ArgumentException("The path must be rooted","path");
 522             Contract.EndContractBlock();
 523
 524             _persistenceAgent.Post(() => FileState.StoreOverlayStatus(path,overlayStatus));
 525         }
 526
 527        /* public void RenameFileOverlayStatus(string oldPath, string newPath)
 528         {
 529             if (String.IsNullOrWhiteSpace(oldPath))
 530                 throw new ArgumentNullException("oldPath");
 531             if (!Path.IsPathRooted(oldPath))
 532                 throw new ArgumentException("The oldPath must be rooted", "oldPath");
 533             if (String.IsNullOrWhiteSpace(newPath))
 534                 throw new ArgumentNullException("newPath");
 535             if (!Path.IsPathRooted(newPath))
 536                 throw new ArgumentException("The newPath must be rooted", "newPath");
 537             Contract.EndContractBlock();
 538
 539             _persistenceAgent.Post(() =>FileState.RenameState(oldPath, newPath));
 540         }*/
 541
 542         public void SetFileState(string path, FileStatus fileStatus, FileOverlayStatus overlayStatus)
 543         {
 544             if (String.IsNullOrWhiteSpace(path))
 545                 throw new ArgumentNullException("path");
 546             if (!Path.IsPathRooted(path))
 547                 throw new ArgumentException("The path must be rooted", "path");
 548             Contract.EndContractBlock();
 549
 550             Debug.Assert(!path.Contains(FolderConstants.CacheFolder));
 551             Debug.Assert(!path.EndsWith(".ignore"));
 552
 553             _persistenceAgent.Post(() => UpdateStatusDirect(path, fileStatus, overlayStatus));
 554         }
 555
 556 /*
 557         public void StoreInfo(string path,ObjectInfo objectInfo)
 558         {
 559             if (String.IsNullOrWhiteSpace(path))
 560                 throw new ArgumentNullException("path");
 561             if (!Path.IsPathRooted(path))
 562                 throw new ArgumentException("The path must be rooted", "path");
 563             if (objectInfo == null)
 564                 throw new ArgumentNullException("objectInfo", "objectInfo can't be empty");
 565             Contract.EndContractBlock();
 566
 567             _persistenceAgent.Post(() =>
 568             {
 569                 var filePath = path.ToLower();
 570                 //Load the existing files state and set its properties in one session
 571                 using (new SessionScope())
 572                 {
 573                     //Forgetting to use a sessionscope results in two sessions being created, one by
 574                     //FirstOrDefault and one by Save()
 575                     var state =FileState.FindByFilePath(filePath);
 576
 577                     //Create a new empty state object if this is a new file
 578                     state = state ?? new FileState();
 579
 580                     state.FilePath = filePath;
 581                     state.Checksum = objectInfo.Hash;
 582                     state.Version = objectInfo.Version;
 583                     state.VersionTimeStamp = objectInfo.VersionTimestamp;
 584
 585                     state.FileStatus = FileStatus.Unchanged;
 586                     state.OverlayStatus = FileOverlayStatus.Normal;
 587
 588
 589                     //Do the save
 590                     state.Save();
 591                 }
 592             });
 593
 594         }
 595 */
 596
 597         public void StoreInfo(string path, ObjectInfo objectInfo)
 598         {
 599             if (String.IsNullOrWhiteSpace(path))
 600                 throw new ArgumentNullException("path");
 601             if (!Path.IsPathRooted(path))
 602                 throw new ArgumentException("The path must be rooted", "path");
 603             if (objectInfo == null)
 604                 throw new ArgumentNullException("objectInfo", "objectInfo can't be empty");
 605             Contract.EndContractBlock();
 606
 607             _persistenceAgent.Post(() => StoreInfoDirect(path, objectInfo));
 608
 609         }
 610
 611         private void StoreInfoDirect(string path, ObjectInfo objectInfo)
 612         {
 613             try
 614             {
 615
 616                 using (var connection = GetConnection())
 617                 using (var command = new SQLiteCommand(connection))
 618                 {
 619                     if (StateExists(path, connection))
 620                         command.CommandText =
 621                             "update FileState set FileStatus= :fileStatus where FilePath = :path  COLLATE NOCASE ";
 622                     else
 623                     {
 624                         command.CommandText =
 625                             "INSERT INTO FileState (Id,FilePath,Checksum,Version,VersionTimeStamp,FileStatus,OverlayStatus) VALUES (:id,:path,:checksum,:version,:versionTimeStamp,:fileStatus,:overlayStatus)";
 626                         command.Parameters.AddWithValue("id", Guid.NewGuid());
 627                     }
 628
 629                     command.Parameters.AddWithValue("path", path);
 630                     command.Parameters.AddWithValue("checksum", objectInfo.Hash);
 631                     command.Parameters.AddWithValue("version", objectInfo.Version);
 632                     command.Parameters.AddWithValue("versionTimeStamp",
 633                                                     objectInfo.VersionTimestamp);
 634                     command.Parameters.AddWithValue("fileStatus", FileStatus.Unchanged);
 635                     command.Parameters.AddWithValue("overlayStatus",
 636                                                     FileOverlayStatus.Normal);
 637
 638                     var affected = command.ExecuteNonQuery();
 639                     return;
 640                 }
 641             }
 642             catch (Exception exc)
 643             {
 644                 Log.Error(exc.ToString());
 645                 throw;
 646             }
 647         }
 648
 649         private bool StateExists(string filePath,SQLiteConnection connection)
 650         {
 651             using (var command = new SQLiteCommand("Select count(*) from FileState where FilePath=:path  COLLATE NOCASE", connection))
 652             {
 653                 command.Parameters.AddWithValue("path", filePath);
 654                 var result = command.ExecuteScalar();
 655                 return ((long)result >= 1);
 656             }
 657
 658         }
 659
 660         public void SetFileStatus(string path, FileStatus status)
 661         {
 662             if (String.IsNullOrWhiteSpace(path))
 663                 throw new ArgumentNullException("path");
 664             if (!Path.IsPathRooted(path))
 665                 throw new ArgumentException("The path must be rooted", "path");
 666             Contract.EndContractBlock();
 667
 668             _persistenceAgent.Post(() => UpdateStatusDirect(path, status));
 669         }
 670
 671         public FileStatus GetFileStatus(string path)
 672         {
 673             if (String.IsNullOrWhiteSpace(path))
 674                 throw new ArgumentNullException("path");
 675             if (!Path.IsPathRooted(path))
 676                 throw new ArgumentException("The path must be rooted", "path");
 677             Contract.EndContractBlock();
 678
 679
 680             using (var connection = GetConnection())
 681             {
 682                 var command = new SQLiteCommand("select FileStatus from FileState where FilePath=:path  COLLATE NOCASE", connection);
 683                 command.Parameters.AddWithValue("path", path);
 684
 685                 var statusValue = command.ExecuteScalar();
 686                 if (statusValue==null)
 687                     return FileStatus.Missing;
 688                 return (FileStatus)Convert.ToInt32(statusValue);
 689             }
 690         }
 691
 692         /// <summary>
 693         /// Deletes the status of the specified file
 694         /// </summary>
 695         /// <param name="path"></param>
 696         public void ClearFileStatus(string path)
 697         {
 698             if (String.IsNullOrWhiteSpace(path))
 699                 throw new ArgumentNullException("path");
 700             if (!Path.IsPathRooted(path))
 701                 throw new ArgumentException("The path must be rooted", "path");
 702             Contract.EndContractBlock();
 703
 704             _persistenceAgent.Post(() => DeleteDirect(path));
 705         }
 706
 707         /// <summary>
 708         /// Deletes the status of the specified folder and all its contents
 709         /// </summary>
 710         /// <param name="path"></param>
 711         public void ClearFolderStatus(string path)
 712         {
 713             if (String.IsNullOrWhiteSpace(path))
 714                 throw new ArgumentNullException("path");
 715             if (!Path.IsPathRooted(path))
 716                 throw new ArgumentException("The path must be rooted", "path");
 717             Contract.EndContractBlock();
 718
 719             _persistenceAgent.Post(() => DeleteFolderDirect(path));
 720         }
 721
 722         public IEnumerable<FileState> GetChildren(FileState fileState)
 723         {
 724             if (fileState == null)
 725                 throw new ArgumentNullException("fileState");
 726             Contract.EndContractBlock();
 727
 728             var children = from state in FileState.Queryable
 729                            where state.FilePath.StartsWith(fileState.FilePath + "\\")
 730                            select state;
 731             return children;
 732         }
 733
 734         private int DeleteDirect(string filePath)
 735         {
 736             using (log4net.ThreadContext.Stacks["StatusAgent"].Push("DeleteDirect"))
 737             {
 738
 739                 try
 740                 {
 741
 742
 743                     using (var connection = GetConnection())
 744                     {
 745                         var command = new SQLiteCommand("delete from FileState where FilePath = :path  COLLATE NOCASE",
 746                                                         connection);
 747
 748                         command.Parameters.AddWithValue("path", filePath);
 749
 750                         var affected = command.ExecuteNonQuery();
 751                         return affected;
 752                     }
 753                 }
 754                 catch (Exception exc)
 755                 {
 756                     Log.Error(exc.ToString());
 757                     throw;
 758                 }
 759             }
 760         }
 761
 762         private int DeleteFolderDirect(string filePath)
 763         {
 764             using (log4net.ThreadContext.Stacks["StatusAgent"].Push("DeleteDirect"))
 765             {
 766
 767                 try
 768                 {
 769
 770
 771                     using (var connection = GetConnection())
 772                     {
 773                         var command = new SQLiteCommand("delete from FileState where FilePath = :path or FilePath like :path + '/%'  COLLATE NOCASE",
 774                                                         connection);
 775
 776                         command.Parameters.AddWithValue("path", filePath);
 777
 778                         var affected = command.ExecuteNonQuery();
 779                         return affected;
 780                     }
 781                 }
 782                 catch (Exception exc)
 783                 {
 784                     Log.Error(exc.ToString());
 785                     throw;
 786                 }
 787             }
 788         }
 789
 790         public void UpdateFileChecksum(string path, string checksum)
 791         {
 792             if (String.IsNullOrWhiteSpace(path))
 793                 throw new ArgumentNullException("path");
 794             if (!Path.IsPathRooted(path))
 795                 throw new ArgumentException("The path must be rooted", "path");
 796             Contract.EndContractBlock();
 797
 798             _persistenceAgent.Post(() => FileState.UpdateChecksum(path, checksum));
 799         }
 800
 801     }
 802
 803
 804 }