| Touch(WritePolicy, Key) | Reset record's time to expiration using the policy's expiration. If the record does not exist, it can't be created because the server deletes empty records. Throw an exception if the record does not exist. |
| Touch(WritePolicy, WriteListener, Key) | Asynchronously reset record's time to expiration using the policy's expiration. Schedule the touch command with a channel selector and return. Another thread will process the command and send the results to the listener. If the record does not exist, it can't be created because the server deletes empty records. |
| Touch(WritePolicy, CancellationToken, Key) | Asynchronously reset record's time to expiration using the policy's expiration. Create listener, call asynchronous touch and return task monitor. If the record does not exist, it can't be created because the server deletes empty records. |