/// <summary>
/// Attempts to obtain a lock on the specified object for up to
/// the specified timeout.
/// </summary>
/// <param name="o"></param>
/// <param name="timeout"></param>
/// <returns></returns>
public static TimedLock Lock(object o, TimeSpan timeout)
{
Thread.BeginCriticalRegion();
var tl = new TimedLock(o);
if (!Monitor.TryEnter(o, timeout))
{
// Failed to acquire lock.
#if DEBUG
GC.SuppressFinalize(tl.leakDetector);
throw new LockTimeoutException(o);
#else
throw new LockTimeoutException();
#endif
}
return(tl);
}
public static object GetOrAddUntyped(this ICache cache, string key, Func <object> add, TimeSpan?timeout = null)
{
var item = cache.Get(key);
if (item == null)
{
if (add == null)
{
return(null);
}
using (TimedLock.Lock(CacheLockScope.AcquireLock <object>(key), timeout ?? Depot.ContentionTimeout))
{
var itemToAdd = add();
if (itemToAdd != null)
{
cache.Add(key, itemToAdd);
}
}
return(cache.Get(key));
}
return(item);
}
public static T GetOrAddTyped <T>(this ICache cache, string key, Func <T> add, TimeSpan?timeout = null) where T : class
{
var item = cache.Get(key);
if (item == null)
{
if (add == null)
{
return(default(T));
}
using (TimedLock.Lock(CacheLockScope.AcquireLock <T>(key), timeout ?? Depot.ContentionTimeout))
{
var itemToAdd = add();
if (itemToAdd != null)
{
cache.Add(key, itemToAdd);
}
}
return(cache.Get <T>(key));
}
return((T)item);
}
/// <summary>
/// Attempts to obtain a lock on the specified object for up to
/// the specified timeout.
/// </summary>
/// <param name="o"></param>
/// <param name="timeout"></param>
/// <returns></returns>
public static TimedLock Lock(object o, TimeSpan timeout)
{
Thread.BeginCriticalRegion();
var tl = new TimedLock(o);
if (!Monitor.TryEnter(o, timeout))
{
// Failed to acquire lock.
#if DEBUG
GC.SuppressFinalize(tl.leakDetector);
throw new LockTimeoutException(o);
#else
throw new LockTimeoutException();
#endif
}
return tl;
}
