A client to Cloud Datastore API
The interfaces provided are listed below, along with usage samples.
DatastoreAdminClient
Service Description: Google Cloud Datastore Admin API
The Datastore Admin API provides several admin services for Cloud Datastore.
----------------------------------------------------------------------------- ## Concepts
Project, namespace, kind, and entity as defined in the Google Cloud Datastore API.
Operation: An Operation represents work being performed in the background.
EntityFilter: Allows specifying a subset of entities in a project. This is specified as a combination of kinds and namespaces (either or both of which may be all).
----------------------------------------------------------------------------- ## Services
# Export/Import
The Export/Import service provides the ability to copy all or a subset of entities to/from Google Cloud Storage.
Exported data may be imported into Cloud Datastore for any Google Cloud Platform project. It is not restricted to the export source project. It is possible to export from one project and then import into another.
Exported data can also be loaded into Google BigQuery for analysis.
Exports and imports are performed asynchronously. An Operation resource is created for each export/import. The state (including any errors encountered) of the export/import may be queried via the Operation resource.
# Index
The index service manages Cloud Datastore composite indexes.
Index creation and deletion are performed asynchronously. An Operation resource is created for each such asynchronous operation. The state of the operation (including any errors encountered) may be queried via the Operation resource.
# Operation
The Operations collection provides a record of actions performed for the specified project (including any operations in progress). Operations are not created directly but through calls on other collections or resources.
An operation that is not yet done may be cancelled. The request to cancel is asynchronous and the operation may continue to run for some time after the request to cancel is made.
An operation that is done may be deleted so that it is no longer listed as part of the Operation collection.
ListOperations returns all pending operations, but not completed operations.
Operations are created by service DatastoreAdmin, but are accessed via service google.longrunning.Operations.
Sample for DatastoreAdminClient:
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
try (DatastoreAdminClient datastoreAdminClient = DatastoreAdminClient.create()) {
GetIndexRequest request =
GetIndexRequest.newBuilder()
.setProjectId("projectId-894832108")
.setIndexId("indexId1943291277")
.build();
Index response = datastoreAdminClient.getIndex(request);
}
Classes
DatastoreAdminClient
Service Description: Google Cloud Datastore Admin API
The Datastore Admin API provides several admin services for Cloud Datastore.
----------------------------------------------------------------------------- ## Concepts
Project, namespace, kind, and entity as defined in the Google Cloud Datastore API.
Operation: An Operation represents work being performed in the background.
EntityFilter: Allows specifying a subset of entities in a project. This is specified as a combination of kinds and namespaces (either or both of which may be all).
----------------------------------------------------------------------------- ## Services
# Export/Import
The Export/Import service provides the ability to copy all or a subset of entities to/from Google Cloud Storage.
Exported data may be imported into Cloud Datastore for any Google Cloud Platform project. It is not restricted to the export source project. It is possible to export from one project and then import into another.
Exported data can also be loaded into Google BigQuery for analysis.
Exports and imports are performed asynchronously. An Operation resource is created for each export/import. The state (including any errors encountered) of the export/import may be queried via the Operation resource.
# Index
The index service manages Cloud Datastore composite indexes.
Index creation and deletion are performed asynchronously. An Operation resource is created for each such asynchronous operation. The state of the operation (including any errors encountered) may be queried via the Operation resource.
# Operation
The Operations collection provides a record of actions performed for the specified project (including any operations in progress). Operations are not created directly but through calls on other collections or resources.
An operation that is not yet done may be cancelled. The request to cancel is asynchronous and the operation may continue to run for some time after the request to cancel is made.
An operation that is done may be deleted so that it is no longer listed as part of the Operation collection.
ListOperations returns all pending operations, but not completed operations.
Operations are created by service DatastoreAdmin, but are accessed via service google.longrunning.Operations.
This class provides the ability to make remote calls to the backing service through method calls that map to API methods. Sample code to get started:
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
try (DatastoreAdminClient datastoreAdminClient = DatastoreAdminClient.create()) {
GetIndexRequest request =
GetIndexRequest.newBuilder()
.setProjectId("projectId-894832108")
.setIndexId("indexId1943291277")
.build();
Index response = datastoreAdminClient.getIndex(request);
}
Note: close() needs to be called on the DatastoreAdminClient object to clean up resources such as threads. In the example above, try-with-resources is used, which automatically calls close().
The surface of this class includes several types of Java methods for each of the API's methods:
- A "flattened" method. With this type of method, the fields of the request type have been converted into function parameters. It may be the case that not all fields are available as parameters, and not every API method will have a flattened method entry point.
- A "request object" method. This type of method only takes one parameter, a request object, which must be constructed before the call. Not every API method will have a request object method.
- A "callable" method. This type of method takes no parameters and returns an immutable API callable object, which can be used to initiate calls to the service.
See the individual methods for example code.
Many parameters require resource names to be formatted in a particular way. To assist with these names, this class includes a format method for each type of name, and additionally a parse method to extract the individual identifiers contained within names that are returned.
This class can be customized by passing in a custom instance of DatastoreAdminSettings to create(). For example:
To customize credentials:
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
DatastoreAdminSettings datastoreAdminSettings =
DatastoreAdminSettings.newBuilder()
.setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
.build();
DatastoreAdminClient datastoreAdminClient = DatastoreAdminClient.create(datastoreAdminSettings);
To customize the endpoint:
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
DatastoreAdminSettings datastoreAdminSettings =
DatastoreAdminSettings.newBuilder().setEndpoint(myEndpoint).build();
DatastoreAdminClient datastoreAdminClient = DatastoreAdminClient.create(datastoreAdminSettings);
To use REST (HTTP1.1/JSON) transport (instead of gRPC) for sending and receiving requests over the wire:
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
DatastoreAdminSettings datastoreAdminSettings =
DatastoreAdminSettings.newBuilder()
.setTransportChannelProvider(
DatastoreAdminSettings.defaultHttpJsonTransportProviderBuilder().build())
.build();
DatastoreAdminClient datastoreAdminClient = DatastoreAdminClient.create(datastoreAdminSettings);
Please refer to the GitHub repository's samples for more quickstart code snippets.
DatastoreAdminClient.ListIndexesFixedSizeCollection
DatastoreAdminClient.ListIndexesPage
DatastoreAdminClient.ListIndexesPagedResponse
DatastoreAdminSettings
Settings class to configure an instance of DatastoreAdminClient.
The default instance has everything set to sensible defaults:
- The default service address (datastore.googleapis.com) and default port (443) are used.
- Credentials are acquired automatically through Application Default Credentials.
- Retries are configured for idempotent methods but not for non-idempotent methods.
The builder of this class is recursive, so contained classes are themselves builders. When build() is called, the tree of builders is called to create the complete settings object.
For example, to set the total timeout of getIndex to 30 seconds:
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
DatastoreAdminSettings.Builder datastoreAdminSettingsBuilder =
DatastoreAdminSettings.newBuilder();
datastoreAdminSettingsBuilder
.getIndexSettings()
.setRetrySettings(
datastoreAdminSettingsBuilder.getIndexSettings().getRetrySettings().toBuilder()
.setTotalTimeout(Duration.ofSeconds(30))
.build());
DatastoreAdminSettings datastoreAdminSettings = datastoreAdminSettingsBuilder.build();
DatastoreAdminSettings.Builder
Builder for DatastoreAdminSettings.