Interface DatastoreBatchWriter (2.28.2)

An interface to represent a batch of write operations. All write operation for a batch writer will be applied to the Datastore in one RPC call.

WARNING: This class maintains an internal state in terms of java.util.LinkedHashMap and java.util.LinkedHashSet which gets updated on every method call performing CRUD operations to record the mutations. Since java.util.LinkedHashMap is not thread safe as per its documentation, This class too should not be treated as a thread safe class.

Implements

Datastore add operation: inserts the provided entity. This method will automatically allocate an id if necessary. If entity has a complete key and was already marked for deletion in this writer, the operation will be changed to #put.

Datastore add operation: inserts the provided entities. This method will automatically allocate id for any entity with an incomplete key. For entities with complete keys that were marked for deletion in this writer the operation will be changed to #put.

Datastore add operation. This method will also allocate id for any entity with an incomplete key. As opposed to #add(FullEntity) and #add(FullEntity...), this method will defer any necessary id allocation to submit time.

A datastore delete operation. It is OK to request the deletion of a non-existing key. This operation will also remove from this batch any prior writes for entities with the same keys.

Returns true if still active (write operations were not sent to the Datastore).

A Datastore put (a.k.a upsert) operation: inserts an entity if it does not exist, updates it otherwise. This method will automatically allocate an id if necessary. This operation will also remove from this writer any prior writes for the same entity.

A Datastore put (a.k.a upsert) operation: creates an entity if it does not exist, updates it otherwise. This method will automatically allocate id for any entity with an incomplete key. This operation will also remove from this writer any prior writes for the same entities.

Datastore put operation. This method will also allocate id for any entity with an incomplete key. As opposed to #put(FullEntity) and #put(FullEntity...), this method will defer any necessary id allocation to submit time.

A Datastore update operation. The operation will fail if an entity with the same key does not already exist. This operation will be converted to #put operation for entities that were already added or put in this writer.