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using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Common.Extensions
{
/// <summary>
/// Class NamedLock
/// </summary>
public class NamedLock : IDisposable
{
/// <summary>
/// The _locks
/// </summary>
private readonly Dictionary<string, SemaphoreSlim> _locks = new Dictionary<string, SemaphoreSlim>();
/// <summary>
/// Waits the async.
/// </summary>
/// <param name="name">The name.</param>
/// <returns>Task.</returns>
public Task WaitAsync(string name)
{
return GetLock(name).WaitAsync();
}
/// <summary>
/// Releases the specified name.
/// </summary>
/// <param name="name">The name.</param>
public void Release(string name)
{
SemaphoreSlim semaphore;
if (_locks.TryGetValue(name, out semaphore))
{
semaphore.Release();
}
}
/// <summary>
/// Gets the lock.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.Object.</returns>
private SemaphoreSlim GetLock(string filename)
{
SemaphoreSlim fileLock;
lock (_locks)
{
if (!_locks.TryGetValue(filename, out fileLock))
{
fileLock = new SemaphoreSlim(1,1);
_locks[filename] = fileLock;
}
}
return fileLock;
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool dispose)
{
if (dispose)
{
DisposeLocks();
}
}
/// <summary>
/// Disposes the locks.
/// </summary>
private void DisposeLocks()
{
lock (_locks)
{
foreach (var semaphore in _locks.Values)
{
semaphore.Dispose();
}
_locks.Clear();
}
}
}
}
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