Class CursorServiceClient (1.9.4)

public class CursorServiceClient implements BackgroundResource

Service Description: The service that a subscriber client application uses to manage committed cursors while receiving messsages. A cursor represents a subscriber's progress within a topic partition for a given subscription.

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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   CommitCursorRequest request =
       CommitCursorRequest.newBuilder()
           .setSubscription("subscription341203229")
           .setPartition(-1799810326)
           .setCursor(Cursor.newBuilder().build())
           .build();
   CommitCursorResponse response = cursorServiceClient.commitCursor(request);
 }

Note: close() needs to be called on the CursorServiceClient 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 CursorServiceSettings 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
 CursorServiceSettings cursorServiceSettings =
     CursorServiceSettings.newBuilder()
         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
         .build();
 CursorServiceClient cursorServiceClient = CursorServiceClient.create(cursorServiceSettings);

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
 CursorServiceSettings cursorServiceSettings =
     CursorServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
 CursorServiceClient cursorServiceClient = CursorServiceClient.create(cursorServiceSettings);

Please refer to the GitHub repository's samples for more quickstart code snippets.

Inheritance

java.lang.Object > CursorServiceClient

Implements

BackgroundResource

Inherited Members

Object.clone()

Object.equals(Object)

Object.finalize()

Object.getClass()

Object.hashCode()

Object.notify()

Object.notifyAll()

Object.toString()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Static Methods

create()

public static final CursorServiceClient create()

Constructs an instance of CursorServiceClient with default settings.

Returns

Type	Description
`CursorServiceClient`

Exceptions

Type	Description
`IOException`

create(CursorServiceSettings settings)

public static final CursorServiceClient create(CursorServiceSettings settings)

Constructs an instance of CursorServiceClient, using the given settings. The channels are created based on the settings passed in, or defaults for any settings that are not set.

Parameter

Name	Description
`settings`	`CursorServiceSettings`

Returns

Type	Description
`CursorServiceClient`

Exceptions

Type	Description
`IOException`

create(CursorServiceStub stub)

public static final CursorServiceClient create(CursorServiceStub stub)

Constructs an instance of CursorServiceClient, using the given stub for making calls. This is for advanced usage - prefer using create(CursorServiceSettings).

Parameter

Name	Description
`stub`	`CursorServiceStub`

Returns

Type	Description
`CursorServiceClient`

Constructors

CursorServiceClient(CursorServiceSettings settings)

protected CursorServiceClient(CursorServiceSettings settings)

Constructs an instance of CursorServiceClient, using the given settings. This is protected so that it is easy to make a subclass, but otherwise, the static factory methods should be preferred.

Parameter

Name	Description
`settings`	`CursorServiceSettings`

CursorServiceClient(CursorServiceStub stub)

protected CursorServiceClient(CursorServiceStub stub)

Parameter

Name	Description
`stub`	`CursorServiceStub`

Methods

awaitTermination(long duration, TimeUnit unit)

public boolean awaitTermination(long duration, TimeUnit unit)

Parameters

Name	Description
`duration`	`long`
`unit`	`TimeUnit`

Returns

Type	Description
`boolean`

Exceptions

Type	Description
`InterruptedException`

close()

public final void close()

commitCursor(CommitCursorRequest request)

public final CommitCursorResponse commitCursor(CommitCursorRequest request)

Updates the committed cursor.

Sample code:


 // 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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   CommitCursorRequest request =
       CommitCursorRequest.newBuilder()
           .setSubscription("subscription341203229")
           .setPartition(-1799810326)
           .setCursor(Cursor.newBuilder().build())
           .build();
   CommitCursorResponse response = cursorServiceClient.commitCursor(request);
 }

Parameter

Name	Description
`request`	`CommitCursorRequest` The request object containing all of the parameters for the API call.

Returns

Type	Description
`CommitCursorResponse`

commitCursorCallable()

public final UnaryCallable<CommitCursorRequest,CommitCursorResponse> commitCursorCallable()

Updates the committed cursor.

Sample code:


 // 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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   CommitCursorRequest request =
       CommitCursorRequest.newBuilder()
           .setSubscription("subscription341203229")
           .setPartition(-1799810326)
           .setCursor(Cursor.newBuilder().build())
           .build();
   ApiFuture<CommitCursorResponse> future =
       cursorServiceClient.commitCursorCallable().futureCall(request);
   // Do something.
   CommitCursorResponse response = future.get();
 }

Returns

Type	Description
`UnaryCallable<CommitCursorRequest,CommitCursorResponse>`

getSettings()

public final CursorServiceSettings getSettings()

Returns

Type	Description
`CursorServiceSettings`

getStub()

public CursorServiceStub getStub()

Returns

Type	Description
`CursorServiceStub`

isShutdown()

public boolean isShutdown()

Returns

Type	Description
`boolean`

isTerminated()

public boolean isTerminated()

Returns

Type	Description
`boolean`

listPartitionCursors(ListPartitionCursorsRequest request)

public final CursorServiceClient.ListPartitionCursorsPagedResponse listPartitionCursors(ListPartitionCursorsRequest request)

Returns all committed cursor information for a subscription.

Sample code:


 // 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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   ListPartitionCursorsRequest request =
       ListPartitionCursorsRequest.newBuilder()
           .setParent(
               SubscriptionName.of("[PROJECT]", "[LOCATION]", "[SUBSCRIPTION]").toString())
           .setPageSize(883849137)
           .setPageToken("pageToken873572522")
           .build();
   for (PartitionCursor element :
       cursorServiceClient.listPartitionCursors(request).iterateAll()) {
     // doThingsWith(element);
   }
 }

Parameter

Name	Description
`request`	`ListPartitionCursorsRequest` The request object containing all of the parameters for the API call.

Returns

Type	Description
`CursorServiceClient.ListPartitionCursorsPagedResponse`

listPartitionCursors(SubscriptionName parent)

public final CursorServiceClient.ListPartitionCursorsPagedResponse listPartitionCursors(SubscriptionName parent)

Returns all committed cursor information for a subscription.

Sample code:


 // 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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   SubscriptionName parent = SubscriptionName.of("[PROJECT]", "[LOCATION]", "[SUBSCRIPTION]");
   for (PartitionCursor element :
       cursorServiceClient.listPartitionCursors(parent).iterateAll()) {
     // doThingsWith(element);
   }
 }

Parameter

Name	Description
`parent`	`SubscriptionName` Required. The subscription for which to retrieve cursors. Structured like `projects/{project_number}/locations/{location}/subscriptions/{subscription_id}`.

Returns

Type	Description
`CursorServiceClient.ListPartitionCursorsPagedResponse`

listPartitionCursors(String parent)

public final CursorServiceClient.ListPartitionCursorsPagedResponse listPartitionCursors(String parent)

Returns all committed cursor information for a subscription.

Sample code:


 // 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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   String parent = SubscriptionName.of("[PROJECT]", "[LOCATION]", "[SUBSCRIPTION]").toString();
   for (PartitionCursor element :
       cursorServiceClient.listPartitionCursors(parent).iterateAll()) {
     // doThingsWith(element);
   }
 }

Parameter

Name	Description
`parent`	`String` Required. The subscription for which to retrieve cursors. Structured like `projects/{project_number}/locations/{location}/subscriptions/{subscription_id}`.

Returns

Type	Description
`CursorServiceClient.ListPartitionCursorsPagedResponse`

listPartitionCursorsCallable()

public final UnaryCallable<ListPartitionCursorsRequest,ListPartitionCursorsResponse> listPartitionCursorsCallable()

Returns all committed cursor information for a subscription.

Sample code:


 // 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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   ListPartitionCursorsRequest request =
       ListPartitionCursorsRequest.newBuilder()
           .setParent(
               SubscriptionName.of("[PROJECT]", "[LOCATION]", "[SUBSCRIPTION]").toString())
           .setPageSize(883849137)
           .setPageToken("pageToken873572522")
           .build();
   while (true) {
     ListPartitionCursorsResponse response =
         cursorServiceClient.listPartitionCursorsCallable().call(request);
     for (PartitionCursor element : response.getPartitionCursorsList()) {
       // doThingsWith(element);
     }
     String nextPageToken = response.getNextPageToken();
     if (!Strings.isNullOrEmpty(nextPageToken)) {
       request = request.toBuilder().setPageToken(nextPageToken).build();
     } else {
       break;
     }
   }
 }

Returns

Type	Description
`UnaryCallable<ListPartitionCursorsRequest,ListPartitionCursorsResponse>`

listPartitionCursorsPagedCallable()

public final UnaryCallable<ListPartitionCursorsRequest,CursorServiceClient.ListPartitionCursorsPagedResponse> listPartitionCursorsPagedCallable()

Returns all committed cursor information for a subscription.

Sample code:


 // 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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   ListPartitionCursorsRequest request =
       ListPartitionCursorsRequest.newBuilder()
           .setParent(
               SubscriptionName.of("[PROJECT]", "[LOCATION]", "[SUBSCRIPTION]").toString())
           .setPageSize(883849137)
           .setPageToken("pageToken873572522")
           .build();
   ApiFuture<PartitionCursor> future =
       cursorServiceClient.listPartitionCursorsPagedCallable().futureCall(request);
   // Do something.
   for (PartitionCursor element : future.get().iterateAll()) {
     // doThingsWith(element);
   }
 }

Returns

Type	Description
`UnaryCallable<ListPartitionCursorsRequest,ListPartitionCursorsPagedResponse>`

shutdown()

public void shutdown()

shutdownNow()

public void shutdownNow()

streamingCommitCursorCallable()

public final BidiStreamingCallable<StreamingCommitCursorRequest,StreamingCommitCursorResponse> streamingCommitCursorCallable()

Establishes a stream with the server for managing committed cursors.

Sample code:


 // 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 (CursorServiceClient cursorServiceClient = CursorServiceClient.create()) {
   BidiStream<StreamingCommitCursorRequest, StreamingCommitCursorResponse> bidiStream =
       cursorServiceClient.streamingCommitCursorCallable().call();
   StreamingCommitCursorRequest request = StreamingCommitCursorRequest.newBuilder().build();
   bidiStream.send(request);
   for (StreamingCommitCursorResponse response : bidiStream) {
     // Do something when a response is received.
   }
 }

Returns

Type	Description
`BidiStreamingCallable<StreamingCommitCursorRequest,StreamingCommitCursorResponse>`