public class
Transaction
extends Object
The Transaction class encapsulates the functionality needed to perform a transaction on the data
at a location.
To run a transaction, provide a Transaction.Handler
to runTransaction(com.google.firebase.database.Transaction.Handler)
. That handler
will be passed the current data at the location, and must return a Transaction.Result
. A Transaction.Result
can be created using either success(MutableData)
or abort()
.
Nested Class Summary
interface | Transaction.Handler | An object implementing this interface is used to run a transaction, and will be notified of the results of the transaction. | |
class | Transaction.Result | Instances of this class represent the desired outcome of a single run of a Transaction.Handler 's
doTransaction method. |
Public Constructor Summary
Public Method Summary
static Transaction.Result |
abort()
|
static Transaction.Result |
success(MutableData resultData)
|
Inherited Method Summary
Public Constructors
public Transaction ()
Public Methods
public static Transaction.Result success (MutableData resultData)
Parameters
resultData | The desired data at the location |
---|
Returns
- A
Transaction.Result
indicating the new data to be stored at the location