public void CanHaveMultipleSharedLocks()
{
_lockTable = new LockTable(TimeSpan.FromSeconds(10), TimeSpan.FromMilliseconds(300));
Assert.DoesNotThrow(() =>
{
var block = new Block(RandomFilename, 0);
_lockTable.SharedLock(block);
_lockTable.SharedLock(block);
_lockTable.SharedLock(block);
_lockTable.Unlock(block);
});
}
public void CanSetSharedLock()
{
_lockTable = new LockTable(TimeSpan.FromSeconds(10), TimeSpan.FromMilliseconds(300));
Assert.DoesNotThrow(() =>
{
_lockTable.SharedLock(new Block(RandomFilename, 0));
});
}
public void ThrowsExceptionIfSharedLockWasNotReceivedBecauseAlreadHadExclusive()
{
_lockTable = new LockTable(TimeSpan.FromMilliseconds(500), TimeSpan.FromMilliseconds(100));
Assert.Throws <LockAbortException>(() =>
{
var block = new Block(RandomFilename, 0);
_lockTable.ExclusiveLock(block);
_lockTable.SharedLock(block);
});
}
public void NotThrowsExceptionIfExclusiveLockWasNotReceivedBecauseAlreadHadShared()
{
_lockTable = new LockTable(TimeSpan.FromMilliseconds(500), TimeSpan.FromMilliseconds(100));
//Assert.Throws<LockAbortException>(() =>
Assert.DoesNotThrow(() =>
{
var block = new Block(RandomFilename, 0);
// The only way to receive a exclusive lock is only after contesting an shared lock
_lockTable.SharedLock(block);
_lockTable.ExclusiveLock(block);
});
}
public void CanWaitForSharedLockIfHaveExclusive()
{
_lockTable = new LockTable(TimeSpan.FromSeconds(10), TimeSpan.FromMilliseconds(100));
Assert.DoesNotThrow(() =>
{
var block = new Block(RandomFilename, 0);
_lockTable.ExclusiveLock(block);
Task.Run(async() =>
{
await Task.Delay(500);
_lockTable.Unlock(block);
});
_lockTable.SharedLock(block);
_lockTable.Unlock(block);
});
}