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- (void) setupAndMigrate: (id<DatabaseManagerMigrateDelegate>) delegate
{
	self.migrationDelegate = delegate;
	NSThread * migrationThread = [[[NSThread alloc ] initWithTarget: self selector: @selector( threadMigration )	object: nil ] autorelease];
	[migrationThread start];
}

- (void) threadMigration
{
	NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
	
	[self performBlockOnMainThread: ^{
		_mainObjectContext = [[NSManagedObjectContext alloc] init];
		[_mainObjectContext setPersistentStoreCoordinator:self.persistentStoreCoordinator];
		[_mainObjectContext setUndoManager:nil];
		NSMergePolicy * merge = [[NSMergePolicy alloc] initWithMergeType:NSMergeByPropertyObjectTrumpMergePolicyType];
		[_mainObjectContext setMergePolicy: merge ];
		[merge release];
	} waitUntilDone: YES ];
	
	if( MIGRATION_VERSION_15 == migration )
	{
		[self performBlockOnMainThread: ^{
			[self setMigrationStatus: DMS_CHECKFAVORITETRACKS ];
			[[JKAlbumsManager sharedManager] initFavoriteTracksInContext:_mainObjectContext];
		} waitUntilDone: YES ];
		
		[self performBlockOnMainThread: ^{
			[self setMigrationStatus: DMS_CHECKFAVORITEARTIST ];
			[[JKArtistsManager sharedManager] initFavoriteTracksInContext:_mainObjectContext];
		} waitUntilDone: YES ];
		
		[self performBlockOnMainThread: ^{
			[self setMigrationStatus: DMS_UPDATEARTISTIDS ];
			[[JKArtistsManager sharedManager] migrateArtistFromPreMasterArtistEra];
		} waitUntilDone: YES ];
		
		[self performBlockOnMainThread: ^{
			[self setMigrationStatus: DMS_PLAYLISTMIGRATION ];
			[self performPlaylistContentMigration];
		} waitUntilDone: YES ];

		[self performBlockOnMainThread: ^{
			[self setMigrationStatus: DMS_SAVEANDFINALIZE ];
			[DatabaseManager saveContext:_mainObjectContext];
		} waitUntilDone: YES ];

	}

	[self performBlockOnMainThread: ^{
		[self setMigrationStatus: DMS_DONE ];
	} waitUntilDone: YES ];

	self.migrationTimer = nil;
	self.migrationDelegate = nil;
	[pool drain];
	[NSThread exit];
}