Class PublisherServiceClient (1.8.0)

public class PublisherServiceClient implements BackgroundResource

Service Description: The service that a publisher client application uses to publish messages to topics. Published messages are retained by the service for the duration of the retention period configured for the respective topic, and are delivered to subscriber clients upon request (via the SubscriberService).

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 (PublisherServiceClient publisherServiceClient = PublisherServiceClient.create()) {
   BidiStream<PublishRequest, PublishResponse> bidiStream =
       publisherServiceClient.publishCallable().call();
   PublishRequest request = PublishRequest.newBuilder().build();
   bidiStream.send(request);
   for (PublishResponse response : bidiStream) {
     // Do something when a response is received.
   }
 }

Note: close() needs to be called on the PublisherServiceClient 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 PublisherServiceSettings 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
 PublisherServiceSettings publisherServiceSettings =
     PublisherServiceSettings.newBuilder()
         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
         .build();
 PublisherServiceClient publisherServiceClient =
     PublisherServiceClient.create(publisherServiceSettings);

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
 PublisherServiceSettings publisherServiceSettings =
     PublisherServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
 PublisherServiceClient publisherServiceClient =
     PublisherServiceClient.create(publisherServiceSettings);

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

Inheritance

java.lang.Object > PublisherServiceClient

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 PublisherServiceClient create()

Constructs an instance of PublisherServiceClient with default settings.

Returns

Type	Description
PublisherServiceClient

Exceptions

Type	Description
IOException

create(PublisherServiceSettings settings)

public static final PublisherServiceClient create(PublisherServiceSettings settings)

Constructs an instance of PublisherServiceClient, 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	`PublisherServiceSettings`

Returns

Type	Description
PublisherServiceClient

Exceptions

Type	Description
IOException

create(PublisherServiceStub stub)

public static final PublisherServiceClient create(PublisherServiceStub stub)

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

Parameter

Name	Description
stub	`PublisherServiceStub`

Returns

Type	Description
PublisherServiceClient

Constructors

PublisherServiceClient(PublisherServiceSettings settings)

protected PublisherServiceClient(PublisherServiceSettings settings)

Constructs an instance of PublisherServiceClient, 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	`PublisherServiceSettings`

PublisherServiceClient(PublisherServiceStub stub)

protected PublisherServiceClient(PublisherServiceStub stub)

Parameter

Name	Description
stub	`PublisherServiceStub`

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()

getSettings()

public final PublisherServiceSettings getSettings()

Returns

Type	Description
PublisherServiceSettings

getStub()

public PublisherServiceStub getStub()

Returns

Type	Description
PublisherServiceStub

isShutdown()

public boolean isShutdown()

Returns

Type	Description
boolean

isTerminated()

public boolean isTerminated()

Returns

Type	Description
boolean

publishCallable()

public final BidiStreamingCallable<PublishRequest,PublishResponse> publishCallable()

Establishes a stream with the server for publishing messages. Once the stream is initialized, the client publishes messages by sending publish requests on the stream. The server responds with a PublishResponse for each PublishRequest sent by the client, in the same order that the requests were sent. Note that multiple PublishRequests can be in flight simultaneously, but they will be processed by the server in the order that they are sent by the client on a given stream.

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 (PublisherServiceClient publisherServiceClient = PublisherServiceClient.create()) {
   BidiStream<PublishRequest, PublishResponse> bidiStream =
       publisherServiceClient.publishCallable().call();
   PublishRequest request = PublishRequest.newBuilder().build();
   bidiStream.send(request);
   for (PublishResponse response : bidiStream) {
     // Do something when a response is received.
   }
 }

Returns

Type	Description
BidiStreamingCallable<PublishRequest,PublishResponse>

shutdown()

public void shutdown()

shutdownNow()

public void shutdownNow()