Class PublisherServiceClient (1.4.12)

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:


 try (PublisherServiceClient publisherServiceClient = PublisherServiceClient.create()) {
   BidiStream

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:

  1. 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.
  2. 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.
  3. 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:


 PublisherServiceSettings publisherServiceSettings =
     PublisherServiceSettings.newBuilder()
         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
         .build();
 PublisherServiceClient publisherServiceClient =
     PublisherServiceClient.create(publisherServiceSettings);

To customize the endpoint:


 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

Static Methods

create()

public static final PublisherServiceClient create()

Constructs an instance of PublisherServiceClient with default settings.

Returns
TypeDescription
PublisherServiceClient
Exceptions
TypeDescription
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
NameDescription
settingsPublisherServiceSettings
Returns
TypeDescription
PublisherServiceClient
Exceptions
TypeDescription
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
NameDescription
stubPublisherServiceStub
Returns
TypeDescription
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
NameDescription
settingsPublisherServiceSettings

PublisherServiceClient(PublisherServiceStub stub)

protected PublisherServiceClient(PublisherServiceStub stub)
Parameter
NameDescription
stubPublisherServiceStub

Methods

awaitTermination(long duration, TimeUnit unit)

public boolean awaitTermination(long duration, TimeUnit unit)
Parameters
NameDescription
durationlong
unitTimeUnit
Returns
TypeDescription
boolean
Exceptions
TypeDescription
InterruptedException

close()

public final void close()

getSettings()

public final PublisherServiceSettings getSettings()
Returns
TypeDescription
PublisherServiceSettings

getStub()

public PublisherServiceStub getStub()
Returns
TypeDescription
PublisherServiceStub

isShutdown()

public boolean isShutdown()
Returns
TypeDescription
boolean

isTerminated()

public boolean isTerminated()
Returns
TypeDescription
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:


 try (PublisherServiceClient publisherServiceClient = PublisherServiceClient.create()) {
   BidiStream
Returns
TypeDescription
BidiStreamingCallable<PublishRequest,PublishResponse>

shutdown()

public void shutdown()

shutdownNow()

public void shutdownNow()