public SyncIndexOutput(SyncDirectory syncDirectory, string name)
{
if (syncDirectory == null)
{
throw new ArgumentNullException(nameof(syncDirectory));
}
//TODO: _name was null here, is this intended? https://github.com/azure-contrib/AzureDirectory/issues/19
// I have changed this to be correct now
_name = name;
_syncDirectory = syncDirectory;
_fileMutex = SyncMutexManager.GrabMutex(_syncDirectory, _name);
_fileMutex.WaitOne();
try
{
// create the local cache one we will operate against...
_indexOutput = CacheDirectory.CreateOutput(_name);
}
finally
{
_fileMutex.ReleaseMutex();
}
}
public SyncIndexInput(SyncIndexInput cloneInput)
{
_fileMutex = SyncMutexManager.GrabMutex(cloneInput._syncDirectory, cloneInput._name);
_fileMutex.WaitOne();
try
{
#if FULLDEBUG
Debug.WriteLine(String.Format("Creating clone for {0}", cloneInput._name));
#endif
_syncDirectory = cloneInput._syncDirectory;
_indexInput = cloneInput._indexInput.Clone() as IndexInput;
}
catch (Exception)
{
// sometimes we get access denied on the 2nd stream...but not always. I haven't tracked it down yet
// but this covers our tail until I do
Trace.Fail(String.Format("Dagnabbit, falling back to memory clone for {0}", cloneInput._name));
}
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();
}
}
