Package com.google.cloud.pubsublite.v1

Class TopicStatsServiceClient

  • All Implemented Interfaces:
    com.google.api.gax.core.BackgroundResource, AutoCloseable
    @Generated("by gapic-generator-java")
public class TopicStatsServiceClient
extends Object
implements com.google.api.gax.core.BackgroundResource
    Service Description: This service allows users to get stats about messages in their topic.

    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 (TopicStatsServiceClient topicStatsServiceClient = TopicStatsServiceClient.create()) {
   ComputeMessageStatsRequest request =
       ComputeMessageStatsRequest.newBuilder()
           .setTopic(TopicName.of("[PROJECT]", "[LOCATION]", "[TOPIC]").toString())
           .setPartition(-1799810326)
           .setStartCursor(Cursor.newBuilder().build())
           .setEndCursor(Cursor.newBuilder().build())
           .build();
   ComputeMessageStatsResponse response = topicStatsServiceClient.computeMessageStats(request);
 }

    Note: close() needs to be called on the TopicStatsServiceClient 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 TopicStatsServiceSettings 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
 TopicStatsServiceSettings topicStatsServiceSettings =
     TopicStatsServiceSettings.newBuilder()
         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
         .build();
 TopicStatsServiceClient topicStatsServiceClient =
     TopicStatsServiceClient.create(topicStatsServiceSettings);

    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
 TopicStatsServiceSettings topicStatsServiceSettings =
     TopicStatsServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
 TopicStatsServiceClient topicStatsServiceClient =
     TopicStatsServiceClient.create(topicStatsServiceSettings);

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

    • Constructor Detail

      • TopicStatsServiceClient

        protected TopicStatsServiceClient​(TopicStatsServiceSettings settings)
                           throws IOException
        Constructs an instance of TopicStatsServiceClient, 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.
        Throws:
        IOException

    • Method Detail

      • create

        public static final TopicStatsServiceClient create​(TopicStatsServiceStub stub)
        Constructs an instance of TopicStatsServiceClient, using the given stub for making calls. This is for advanced usage - prefer using create(TopicStatsServiceSettings).

      • computeMessageStats

        public final ComputeMessageStatsResponse computeMessageStats​(ComputeMessageStatsRequest request)
        Compute statistics about a range of messages in a given topic and partition.

        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 (TopicStatsServiceClient topicStatsServiceClient = TopicStatsServiceClient.create()) {
   ComputeMessageStatsRequest request =
       ComputeMessageStatsRequest.newBuilder()
           .setTopic(TopicName.of("[PROJECT]", "[LOCATION]", "[TOPIC]").toString())
           .setPartition(-1799810326)
           .setStartCursor(Cursor.newBuilder().build())
           .setEndCursor(Cursor.newBuilder().build())
           .build();
   ComputeMessageStatsResponse response = topicStatsServiceClient.computeMessageStats(request);
 }
        Parameters:
        request - The request object containing all of the parameters for the API call.
        Throws:
        com.google.api.gax.rpc.ApiException - if the remote call fails

      • computeMessageStatsCallable

        public final com.google.api.gax.rpc.UnaryCallable<ComputeMessageStatsRequest,​ComputeMessageStatsResponse> computeMessageStatsCallable()
        Compute statistics about a range of messages in a given topic and partition.

        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 (TopicStatsServiceClient topicStatsServiceClient = TopicStatsServiceClient.create()) {
   ComputeMessageStatsRequest request =
       ComputeMessageStatsRequest.newBuilder()
           .setTopic(TopicName.of("[PROJECT]", "[LOCATION]", "[TOPIC]").toString())
           .setPartition(-1799810326)
           .setStartCursor(Cursor.newBuilder().build())
           .setEndCursor(Cursor.newBuilder().build())
           .build();
   ApiFuture<ComputeMessageStatsResponse> future =
       topicStatsServiceClient.computeMessageStatsCallable().futureCall(request);
   // Do something.
   ComputeMessageStatsResponse response = future.get();
 }

      • computeHeadCursor

        public final ComputeHeadCursorResponse computeHeadCursor​(ComputeHeadCursorRequest request)
        Compute the head cursor for the partition. The head cursor's offset is guaranteed to be less than or equal to all messages which have not yet been acknowledged as published, and greater than the offset of any message whose publish has already been acknowledged. It is zero if there have never been messages in the partition.

        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 (TopicStatsServiceClient topicStatsServiceClient = TopicStatsServiceClient.create()) {
   ComputeHeadCursorRequest request =
       ComputeHeadCursorRequest.newBuilder()
           .setTopic(TopicName.of("[PROJECT]", "[LOCATION]", "[TOPIC]").toString())
           .setPartition(-1799810326)
           .build();
   ComputeHeadCursorResponse response = topicStatsServiceClient.computeHeadCursor(request);
 }
        Parameters:
        request - The request object containing all of the parameters for the API call.
        Throws:
        com.google.api.gax.rpc.ApiException - if the remote call fails

      • computeHeadCursorCallable

        public final com.google.api.gax.rpc.UnaryCallable<ComputeHeadCursorRequest,​ComputeHeadCursorResponse> computeHeadCursorCallable()
        Compute the head cursor for the partition. The head cursor's offset is guaranteed to be less than or equal to all messages which have not yet been acknowledged as published, and greater than the offset of any message whose publish has already been acknowledged. It is zero if there have never been messages in the partition.

        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 (TopicStatsServiceClient topicStatsServiceClient = TopicStatsServiceClient.create()) {
   ComputeHeadCursorRequest request =
       ComputeHeadCursorRequest.newBuilder()
           .setTopic(TopicName.of("[PROJECT]", "[LOCATION]", "[TOPIC]").toString())
           .setPartition(-1799810326)
           .build();
   ApiFuture<ComputeHeadCursorResponse> future =
       topicStatsServiceClient.computeHeadCursorCallable().futureCall(request);
   // Do something.
   ComputeHeadCursorResponse response = future.get();
 }

      • computeTimeCursor

        public final ComputeTimeCursorResponse computeTimeCursor​(ComputeTimeCursorRequest request)
        Compute the corresponding cursor for a publish or event time in a topic partition.

        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 (TopicStatsServiceClient topicStatsServiceClient = TopicStatsServiceClient.create()) {
   ComputeTimeCursorRequest request =
       ComputeTimeCursorRequest.newBuilder()
           .setTopic(TopicName.of("[PROJECT]", "[LOCATION]", "[TOPIC]").toString())
           .setPartition(-1799810326)
           .setTarget(TimeTarget.newBuilder().build())
           .build();
   ComputeTimeCursorResponse response = topicStatsServiceClient.computeTimeCursor(request);
 }
        Parameters:
        request - The request object containing all of the parameters for the API call.
        Throws:
        com.google.api.gax.rpc.ApiException - if the remote call fails

      • computeTimeCursorCallable

        public final com.google.api.gax.rpc.UnaryCallable<ComputeTimeCursorRequest,​ComputeTimeCursorResponse> computeTimeCursorCallable()
        Compute the corresponding cursor for a publish or event time in a topic partition.

        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 (TopicStatsServiceClient topicStatsServiceClient = TopicStatsServiceClient.create()) {
   ComputeTimeCursorRequest request =
       ComputeTimeCursorRequest.newBuilder()
           .setTopic(TopicName.of("[PROJECT]", "[LOCATION]", "[TOPIC]").toString())
           .setPartition(-1799810326)
           .setTarget(TimeTarget.newBuilder().build())
           .build();
   ApiFuture<ComputeTimeCursorResponse> future =
       topicStatsServiceClient.computeTimeCursorCallable().futureCall(request);
   // Do something.
   ComputeTimeCursorResponse response = future.get();
 }

      • shutdown

        public void shutdown()
        Specified by:
        shutdown in interface com.google.api.gax.core.BackgroundResource

      • isShutdown

        public boolean isShutdown()
        Specified by:
        isShutdown in interface com.google.api.gax.core.BackgroundResource

      • isTerminated

        public boolean isTerminated()
        Specified by:
        isTerminated in interface com.google.api.gax.core.BackgroundResource

      • shutdownNow

        public void shutdownNow()
        Specified by:
        shutdownNow in interface com.google.api.gax.core.BackgroundResource