/// <summary>
/// Acquires a lock of the specified type and returns an opaque lock object
/// that will release the lock when disposed.
///
/// <code>using (blocks.AcquireLock(RequestLock.Read)) {}</code>
/// </summary>
/// <returns>An opaque lock object that will release lock on disposal.</returns>
public IDisposable AcquireLock(RequestLock requestLock)
{
// Acquire the lock based on the requested type.
IDisposable acquiredLock;
switch (requestLock)
{
case RequestLock.Read:
acquiredLock = new NestableReadLock(accessLock);
break;
case RequestLock.UpgradableRead:
acquiredLock = new NestableUpgradableReadLock(accessLock);
break;
case RequestLock.Write:
acquiredLock = new NestableWriteLock(accessLock);
break;
default:
throw new InvalidOperationException(
"Could not acquire lock with unknown type: " + requestLock);
}
// Return the resulting lock.
return(acquiredLock);
}
/// <summary>
/// Acquires a read lock on both the block and the block collection.
/// </summary>
/// <param name="collectionLock">The lock on the block collection.</param>
/// <param name="blockLock">The lock object used to acquire the lock.</param>
/// <param name="requestLock"></param>
public BlockLock(
IDisposable collectionLock,
ReaderWriterLockSlim accessLock,
RequestLock requestLock)
{
// Keep track of the collection lock so we can release it.
this.collectionLock = collectionLock;
// Acquire the lock based on the requested type.
switch (requestLock)
{
case RequestLock.Read:
blockLock = new NestableReadLock(accessLock);
break;
case RequestLock.UpgradableRead:
blockLock = new NestableUpgradableReadLock(accessLock);
break;
case RequestLock.Write:
blockLock = new NestableWriteLock(accessLock);
break;
default:
throw new InvalidOperationException(
"Could not acquire lock with unknown type: " + requestLock);
}
}
