protected OwlCommand GetNext(bool remove)
{
OwlCommand next = null;
_lock.EnterUpgradeableReadLock();
try
{
if (_commandList.Count > 0)
{
next = _commandList.First();
if (remove)
{
_lock.EnterWriteLock();
try
{
_commandList.Remove(next);
FireQueueChangedEvent();
if (_commandList.Count == 0)
{
FireQueueEmptyEvent();
}
}
finally
{
if (_lock.IsWriteLockHeld)
{
_lock.ExitWriteLock();
}
}
}
}
}
catch (Exception exAny)
{
//Log something?
throw;
}
finally
{
if (_lock.IsUpgradeableReadLockHeld)
{
_lock.ExitUpgradeableReadLock();
}
}
return(next);
}
public void Add(OwlCommand c, bool insertAtFront)
{
_lock.EnterUpgradeableReadLock();
try
{
List <OwlCommand> found = _commandList.FindAll(x => x.Id == c.Id);
if (found.Count == 0)
{
_lock.EnterWriteLock();
}
try
{
if (insertAtFront)
{
_commandList.Insert(0, c);
}
else
{
_commandList.Add(c);
}
FireCommandAddedEvent(c);
}
finally
{
if (_lock.IsWriteLockHeld)
{
_lock.ExitWriteLock();
}
}
}
catch (Exception exAny)
{
//Log something?
throw;
}
finally
{
if (_lock.IsUpgradeableReadLockHeld)
{
_lock.ExitUpgradeableReadLock();
}
}
}
//------------------
private void FireCommandAddedEvent(OwlCommand c)
{
CommandAdded?.Invoke(this, c);
FireQueueChangedEvent();
}
public void Add(OwlCommand c)
{
Add(c, false);
}
public int Remove(OwlCommand c)
{
return(Remove(c.Id));
}