public Task <int> Operation(
FileOperationType operation,
string systemPath,
long position,
int length,
FileIOPriority priority,
byte[] buffer,
int bufferOffset,
PriorityFileStream fs = null)
{
var drive = Path.GetPathRoot(systemPath);
DriveIOScheduler scheduler;
lock (_drives)
scheduler = _drives.FirstOrDefault(p => p.Key == drive).Value;
if (scheduler == null)
{
scheduler = new DriveIOScheduler();
lock (_drives)
_drives.Add(new KeyValuePair <string, DriveIOScheduler>(drive, scheduler));
}
return(scheduler.Operation(operation, systemPath, position, length, priority, buffer, bufferOffset, fs));
}
public Task <int> Operation(
FileOperationType operation,
string systemPath,
long position,
int length,
FileIOPriority priority,
byte[] buffer,
int bufferOffset,
PriorityFileStream fs = null)
{
var op = new FileIOOperation
{
SystemPath = systemPath,
Buffer = buffer,
BufferOffset = bufferOffset,
Position = position,
Length = length,
Operation = operation,
TaskCompletionSource = new TaskCompletionSource <int>(),
FileStream = fs
};
switch (priority)
{
case FileIOPriority.Default:
lock (_defaultQueue)
_defaultQueue.Enqueue(op);
break;
case FileIOPriority.Background:
lock (_backgroundQueue)
_backgroundQueue.Enqueue(op);
break;
default:
throw new ArgumentOutOfRangeException(nameof(priority), priority, null);
}
if (Interlocked.Increment(ref _activeOperations) <= FileIOScheduler.Instance.MaxConcurrentOperations)
{
StartNewReadTask();
}
else
{
Interlocked.Decrement(ref _activeOperations);
}
return(op.TaskCompletionSource.Task);
}
public PriorityFileStream(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options, FileIOPriority ioPriority) :
base(path, mode, access, share, bufferSize, options)
{
_priority = ioPriority;
}
public PriorityFileStream(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options) :
base(path, mode, access, share, bufferSize, options)
{
_priority = ThreadUtility.InBackgorundMode() ? FileIOPriority.Background : FileIOPriority.Default;
}
