Firebase Docs Reference WriteBatch.Function public static interface WriteBatch.Function An interface for providing code to be executed within a WriteBatch context. See Also runBatch(WriteBatch.Function) Public Method Summary abstract void apply(WriteBatch batch) Public Methods public abstract void apply (WriteBatch batch) Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated March 27, 2019.