public CompositeIndexInput(SyncDirectory azuredirectory, string name, string resourceDescription) : base(resourceDescription)
{
_name = name;
#if FULLDEBUG
Debug.WriteLine(String.Format("opening {0} ", _name));
#endif
_fileMutex = SyncMutexManager.GrabMutex(_name);
_fileMutex.WaitOne();
try
{
_syncDirectory = azuredirectory;
var fileName = _name;
var fFileNeeded = false;
if (!CacheDirectory.FileExists(fileName))
{
fFileNeeded = true;
}
else
{
long cachedLength = CacheDirectory.FileLength(fileName);
long primaryLength = PrimaryDirectory.FileLength(fileName);
if (cachedLength != primaryLength)
{
fFileNeeded = true;
}
else
{
// cachedLastModifiedUTC was not ouputting with a date (just time) and the time was always off
var cachedFilePath = Path.Combine(_syncDirectory.CacheDirectoryPath, fileName);
var primaryFilePath = Path.Combine(_syncDirectory.PrimaryDirectoryPath, fileName);
var cachedLastModified = File.GetLastWriteTimeUtc(cachedFilePath);
var primaryLastModified = File.GetLastWriteTimeUtc(primaryFilePath);
if (cachedLastModified != primaryLastModified)
{
var timeSpan = primaryLastModified.Subtract(cachedLastModified);
if (timeSpan.TotalSeconds > 1)
{
fFileNeeded = true;
}
else
{
#if FULLDEBUG
Debug.WriteLine(timeSpan.TotalSeconds);
#endif
// file not needed
}
}
}
}
// if the file does not exist
// or if it exists and it is older then the lastmodified time in the blobproperties (which always comes from the blob storage)
if (fFileNeeded)
{
var primaryInput = PrimaryDirectory.OpenInput(fileName, IOContext.DEFAULT);
byte[] primaryInputBytes = new byte[primaryInput.Length];
primaryInput.ReadBytes(primaryInputBytes, 0, (int)primaryInputBytes.Length);
using (var cachedOutput = CacheDirectory.CreateOutput(fileName, IOContext.DEFAULT))
{
cachedOutput.WriteBytes(primaryInputBytes, (int)primaryInputBytes.Length);
cachedOutput.Flush();
}
primaryInput.Dispose();
var cachedFilePath = Path.Combine(_syncDirectory.CacheDirectoryPath, fileName);
var primaryFilePath = Path.Combine(_syncDirectory.PrimaryDirectoryPath, fileName);
var primaryLastModified = File.GetLastWriteTimeUtc(primaryFilePath);
File.SetLastWriteTimeUtc(cachedFilePath, primaryLastModified);
//using (var fileStream = _azureDirectory.CreateCachedOutputAsStream(fileName))
//{
// // get the blob
// _blob.DownloadToStream(fileStream);
// fileStream.Flush();
// Debug.WriteLine(string.Format("GET {0} RETREIVED {1} bytes", _name, fileStream.Length));
//}
// and open it as an input
_indexInput = CacheDirectory.OpenInput(fileName, IOContext.DEFAULT);
}
else
{
#if FULLDEBUG
Debug.WriteLine(String.Format("Using cached file for {0}", _name));
#endif
// open the file in read only mode
_indexInput = CacheDirectory.OpenInput(fileName, IOContext.DEFAULT);
}
}
finally
{
_fileMutex.ReleaseMutex();
}
}
public SyncIndexInput(SyncDirectory directory, string name)
{
if (directory == null)
{
throw new ArgumentNullException(nameof(directory));
}
_name = name;
_syncDirectory = directory;
#if FULLDEBUG
Trace.WriteLine(String.Format("opening {0} ", _name));
#endif
_fileMutex = SyncMutexManager.GrabMutex(_syncDirectory, _name);
_fileMutex.WaitOne();
try
{
var fileName = _name;
var fFileNeeded = false;
if (!CacheDirectory.FileExists(fileName))
{
fFileNeeded = true;
}
else
{
long cachedLength = CacheDirectory.FileLength(fileName);
long masterLength = MasterDirectory.FileLength(fileName);
if (cachedLength != masterLength)
{
fFileNeeded = true;
}
else
{
long cacheDate = CacheDirectory.FileModified(fileName);
long masterDate = MasterDirectory.FileModified(fileName);
//we need to compare to the second instead of by ticks because when we call
//TouchFile in SyncIndexOutput this won't set the files to be identical
DateTime start = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
var cachedLastModifiedUTC = start.AddMilliseconds(cacheDate).ToUniversalTime();
var masterLastModifiedUTC = start.AddMilliseconds(masterDate).ToUniversalTime();
if (cachedLastModifiedUTC != masterLastModifiedUTC)
{
var timeSpan = masterLastModifiedUTC.Subtract(cachedLastModifiedUTC);
//NOTE: This heavily depends on TouchFile in SyncIndexOutput which sets both the
//master and slave files to be 'Now', in theory this operation shouldn't
//make the file times any bigger than 1 second
if (timeSpan.TotalSeconds > 2)
{
fFileNeeded = true;
}
else
{
#if FULLDEBUG
Debug.WriteLine(timeSpan.TotalSeconds);
#endif
// file not needed
}
}
}
}
// if the file does not exist
// or if it exists and it is older then the lastmodified time in the blobproperties (which always comes from the blob storage)
if (fFileNeeded)
{
//get the master file stream
using (var masterStream = new StreamInput(MasterDirectory.OpenInput(fileName)))
using (var cacheStream = _syncDirectory.CreateCachedOutputAsStream(fileName))
{
//copy this to the cached file stream
masterStream.CopyTo(cacheStream);
cacheStream.Flush();
Debug.WriteLine(string.Format("GET {0} RETREIVED {1} bytes", _name, cacheStream.Length));
}
// and open it as an input
_indexInput = CacheDirectory.OpenInput(fileName);
}
else
{
#if FULLDEBUG
Debug.WriteLine(String.Format("Using cached file for {0}", _name));
#endif
// open the file in read only mode
_indexInput = CacheDirectory.OpenInput(fileName);
}
}
finally
{
_fileMutex.ReleaseMutex();
}
}