public bool Delete(Transaction context, RID rId, int count)
{
// enlist with TM
this.Enlist(context);
// read in the resource
Resource data = null;
bool removed = this.dataStore.Read(context, rId, out data);
if (!removed ||
null == data)
{
// silently discard
return(false);
}
// update the resource
if (data.getCount() > count)
{
data.decrCount(count);
}
else
{
data.setCount(0);
}
// write the resource back
return(this.dataStore.Write(context, rId, data));
}
/// <summary>
/// Deletes certain amount of resource.
/// </summary>
/// <param name="context"></param>
/// <param name="rid"></param>
/// <param name="count"></param>
/// <returns>true the given resources exists. False if not</returns>
public bool Delete(Transaction context, RID rid, int count)
{
WaitForReady();
Enlist(context);
_lockManager.LockForWrite(context, rid);
Resource resource = _transactionStorage.Read(context, rid);
if (resource == null)
{
// silently discard
return(false);
}
if (resource.getCount() > count)
{
resource.decrCount(count);
}
else
{
resource.setCount(0);
}
_transactionStorage.Write(context, rid, resource);
return(true);
}