Enlistment.Done Method
Definition
Important
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Indicates that the transaction participant has completed its work.
public:
void Done();public void Done ();member this.Done : unit -> unitPublic Sub Done ()Remarks
During the final phase of the transaction commit, the transaction manager calls either the Commit, Rollback or InDoubt method of the participant, depending on whether the transaction is to be committed or rolled back. The resource manager should perform any work necessary to finish the transaction and then inform the transaction manager that it has finished by calling the Done method on the enlistment parameter.
If the resource manager has enlisted durably, but does not respond by calling Done method, the transaction manager is unsure that the resource manager has received the respective notification call. As such, the transaction manager keeps waiting for a response, and maintains information relevant to this transaction. If Done is never called, this piece of information is kept around indefinitely in memory or in a system-wide resource. This results in resources not being able to be reclaimed. In the case of a distributed transaction, this could eventually fill the MSDTC log which halts the MSDTC process. In the case of a transaction managed by System.Transactions, this results in a gradual and continual increase in the memory consumption of the resource manager's process. Therefore, it is crucial that you call the Done method once your resource manager is done with your prepare work.
An enlistment can call the Done method at anytime before it has called Prepared in the prepare phase. By doing so, the enlistment is casting a read only vote, meaning that it votes commit on the transaction but does not need to receive the final outcome. Note that, after this method is called, the enlisted participant receives no further notifications from the transaction manager.
