public override void Close()
{
_fileMutex.WaitOne();
try
{
string fileName = _name;
// make sure it's all written out
_indexOutput.Flush();
long originalLength = _indexOutput.Length();
_indexOutput.Close();
Stream blobStream;
// optionally put a compressor around the blob stream
if (_azureDirectory.ShouldCompressFile(_name))
{
blobStream = CompressStream(fileName, originalLength);
}
else
{
blobStream = new StreamInput(CacheDirectory.OpenInput(fileName));
}
try
{
// push the blobStream up to the cloud
_blob.UploadFromStream(blobStream);
// set the metadata with the original index file properties
_blob.Metadata["CachedLength"] = originalLength.ToString();
_blob.Metadata["CachedLastModified"] = CacheDirectory.FileModified(fileName).ToString();
_blob.SetMetadata();
#if FULLDEBUG
Trace.WriteLine($"PUT {blobStream.Length} bytes to {_name} in cloud");
#endif
}
finally
{
blobStream.Dispose();
}
#if FULLDEBUG
Trace.WriteLine($"CLOSED WRITESTREAM {_name}");
#endif
// clean up
_indexOutput = null;
_blobContainer = null;
_blob = null;
GC.SuppressFinalize(this);
}
finally
{
_fileMutex.ReleaseMutex();
}
}
public AzureIndexInput(AzureDirectory azuredirectory, ICloudBlob blob)
{
if (azuredirectory == null)
{
throw new ArgumentNullException(nameof(azuredirectory));
}
_name = blob.Uri.Segments[blob.Uri.Segments.Length - 1];
_azureDirectory = azuredirectory;
#if FULLDEBUG
Debug.WriteLine(String.Format("opening {0} ", _name));
#endif
_fileMutex = SyncMutexManager.GrabMutex(_azureDirectory, _name);
_fileMutex.WaitOne();
try
{
_blobContainer = azuredirectory.BlobContainer;
_blob = blob;
var fileName = _name;
var fFileNeeded = false;
if (!CacheDirectory.FileExists(fileName))
{
fFileNeeded = true;
}
else
{
long cachedLength = CacheDirectory.FileLength(fileName);
string blobLengthMetadata;
bool hasMetadataValue = blob.Metadata.TryGetValue("CachedLength", out blobLengthMetadata);
long blobLength = blob.Properties.Length;
if (hasMetadataValue)
{
long.TryParse(blobLengthMetadata, out blobLength);
}
string blobLastModifiedMetadata;
long longLastModified = 0;
DateTime blobLastModifiedUTC = blob.Properties.LastModified.Value.UtcDateTime;
if (blob.Metadata.TryGetValue("CachedLastModified", out blobLastModifiedMetadata))
{
if (long.TryParse(blobLastModifiedMetadata, out longLastModified))
{
blobLastModifiedUTC = new DateTime(longLastModified).ToUniversalTime();
}
}
if (cachedLength != blobLength)
{
fFileNeeded = true;
}
else
{
// cachedLastModifiedUTC was not ouputting with a date (just time) and the time was always off
long unixDate = CacheDirectory.FileModified(fileName);
DateTime start = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
var cachedLastModifiedUTC = start.AddMilliseconds(unixDate).ToUniversalTime();
if (cachedLastModifiedUTC != blobLastModifiedUTC)
{
var timeSpan = blobLastModifiedUTC.Subtract(cachedLastModifiedUTC);
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)
{
if (_azureDirectory.ShouldCompressFile(_name))
{
InflateStream(fileName);
}
else
{
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);
}
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();
}
}