public class

Transaction

extends Object
java.lang.Object
   ↳ com.google.firebase.database.Transaction

Class Overview

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().

Summary

Nested Classes
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 Constructors
Transaction()
Public Methods
static Transaction.Result abort()
static Transaction.Result success(MutableData resultData)
[Expand]
Inherited Methods
From class java.lang.Object

Public Constructors

public Transaction ()

Public Methods

public static Transaction.Result abort ()

Returns
Transaction.Result A Transaction.Result that aborts the transaction

public static Transaction.Result success (MutableData resultData)

Parameters
resultData MutableData: The desired data at the location
Returns
Transaction.Result A Transaction.Result indicating the new data to be stored at the location