Package com.google.longrunning

Class OperationsClient

java.lang.Object
com.google.longrunning.OperationsClient
All Implemented Interfaces:
BackgroundResource, AutoCloseable
public class OperationsClient extends Object implements BackgroundResource
Service Description: Manages long-running operations with an API service.

When an API method normally takes long time to complete, it can be designed to return [Operation][google.longrunning.Operation] to the client, and the client can use this interface to receive the real response asynchronously by polling the operation resource, or pass the operation resource to another API (such as Google Cloud Pub/Sub API) to receive the response. Any API service that returns long-running operations should implement the `Operations` interface so developers can have a consistent client experience.

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 (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   Operation response = operationsClient.getOperation(name);
 }

Note: close() needs to be called on the operationsClient 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 OperationsSettings to create(). For example:

To customize credentials: 

 
 OperationsSettings operationsSettings =
     OperationsSettings.newBuilder()
         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
         .build();
 OperationsClient operationsClient =
     OperationsClient.create(operationsSettings);

  • Constructor Details

    • OperationsClient

      protected OperationsClient(OperationsSettings settings) throws IOException
      Constructs an instance of OperationsClient, 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

    • OperationsClient

      protected OperationsClient(OperationsStub stub)

  • Method Details

    • create

      public static final OperationsClient create(OperationsSettings settings) throws IOException
      Constructs an instance of OperationsClient, using the given settings. The channels are created based on the settings passed in, or defaults for any settings that are not set.
      Throws:
      IOException

    • create

      public static final OperationsClient create(OperationsStub stub)
      Constructs an instance of OperationsClient, using the given stub for making calls. This is for advanced usage - prefer to use OperationsSettings}.

    • getSettings

      public final OperationsSettings getSettings()

    • getStub

      public OperationsStub getStub()

    • getOperation

      public final Operation getOperation(String name)
      Gets the latest state of a long-running operation. Clients can use this method to poll the operation result at intervals as recommended by the API service.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   Operation response = operationsClient.getOperation(name);
 }
      Parameters:
      name - The name of the operation resource.
      Throws:
      ApiException - if the remote call fails

    • getOperationCallable

      public final UnaryCallable<GetOperationRequest,Operation> getOperationCallable()
      Gets the latest state of a long-running operation. Clients can use this method to poll the operation result at intervals as recommended by the API service.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   GetOperationRequest request = GetOperationRequest.newBuilder()
     .setName(name)
     .build();
   ApiFuture<Operation> future = operationsClient.getOperationCallable().futureCall(request);
   // Do something
   Operation response = future.get();
 }

    • listOperations

      public final OperationsClient.ListOperationsPagedResponse listOperations(String name, String filter)
      Lists operations that match the specified filter in the request. If the server doesn't support this method, it returns `UNIMPLEMENTED`.

      NOTE: the `name` binding below allows API services to override the binding to use different resource name schemes, such as `users/*/operations`.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   String filter = "";
   for (Operation element : operationsClient.listOperations(name, filter).iterateAll()) {
     // doThingsWith(element);
   }
 }
      Parameters:
      name - The name of the operation collection.
      filter - The standard list filter.
      Throws:
      ApiException - if the remote call fails

    • listOperations

      public final OperationsClient.ListOperationsPagedResponse listOperations(ListOperationsRequest request)
      Lists operations that match the specified filter in the request. If the server doesn't support this method, it returns `UNIMPLEMENTED`.

      NOTE: the `name` binding below allows API services to override the binding to use different resource name schemes, such as `users/*/operations`.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   String filter = "";
   ListOperationsRequest request = ListOperationsRequest.newBuilder()
     .setName(name)
     .setFilter(filter)
     .build();
   for (Operation element : operationsClient.listOperations(request).iterateAll()) {
     // doThingsWith(element);
   }
 }
      Parameters:
      request - The request object containing all of the parameters for the API call.
      Throws:
      ApiException - if the remote call fails

    • listOperationsPagedCallable

      public final UnaryCallable<ListOperationsRequest,OperationsClient.ListOperationsPagedResponse> listOperationsPagedCallable()
      Lists operations that match the specified filter in the request. If the server doesn't support this method, it returns `UNIMPLEMENTED`.

      NOTE: the `name` binding below allows API services to override the binding to use different resource name schemes, such as `users/*/operations`.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   String filter = "";
   ListOperationsRequest request = ListOperationsRequest.newBuilder()
     .setName(name)
     .setFilter(filter)
     .build();
   ApiFuture<ListOperationsPagedResponse> future = operationsClient.listOperationsPagedCallable().futureCall(request);
   // Do something
   for (Operation element : future.get().iterateAll()) {
     // doThingsWith(element);
   }
 }

    • listOperationsCallable

      public final UnaryCallable<ListOperationsRequest,ListOperationsResponse> listOperationsCallable()
      Lists operations that match the specified filter in the request. If the server doesn't support this method, it returns `UNIMPLEMENTED`.

      NOTE: the `name` binding below allows API services to override the binding to use different resource name schemes, such as `users/*/operations`.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   String filter = "";
   ListOperationsRequest request = ListOperationsRequest.newBuilder()
     .setName(name)
     .setFilter(filter)
     .build();
   while (true) {
     ListOperationsResponse response = operationsClient.listOperationsCallable().call(request);
     for (Operation element : response.getOperationsList()) {
       // doThingsWith(element);
     }
     String nextPageToken = response.getNextPageToken();
     if (!Strings.isNullOrEmpty(nextPageToken)) {
       request = request.toBuilder().setPageToken(nextPageToken).build();
     } else {
       break;
     }
   }
 }

    • cancelOperation

      public final void cancelOperation(String name)
      Starts asynchronous cancellation on a long-running operation. The server makes a best effort to cancel the operation, but success is not guaranteed. If the server doesn't support this method, it returns `google.rpc.Code.UNIMPLEMENTED`. Clients can use [Operations.GetOperation][google.longrunning.Operations.GetOperation] or other methods to check whether the cancellation succeeded or whether the operation completed despite cancellation. On successful cancellation, the operation is not deleted; instead, it becomes an operation with an [Operation.error][google.longrunning.Operation.error] value with a [google.rpc.Status.code][google.rpc.Status.code] of 1, corresponding to `Code.CANCELLED`.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   operationsClient.cancelOperation(name);
 }
      Parameters:
      name - The name of the operation resource to be cancelled.
      Throws:
      ApiException - if the remote call fails

    • cancelOperationCallable

      public final UnaryCallable<CancelOperationRequest,com.google.protobuf.Empty> cancelOperationCallable()
      Starts asynchronous cancellation on a long-running operation. The server makes a best effort to cancel the operation, but success is not guaranteed. If the server doesn't support this method, it returns `google.rpc.Code.UNIMPLEMENTED`. Clients can use [Operations.GetOperation][google.longrunning.Operations.GetOperation] or other methods to check whether the cancellation succeeded or whether the operation completed despite cancellation. On successful cancellation, the operation is not deleted; instead, it becomes an operation with an [Operation.error][google.longrunning.Operation.error] value with a [google.rpc.Status.code][google.rpc.Status.code] of 1, corresponding to `Code.CANCELLED`.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   CancelOperationRequest request = CancelOperationRequest.newBuilder()
     .setName(name)
     .build();
   ApiFuture<Void> future = operationsClient.cancelOperationCallable().futureCall(request);
   // Do something
   future.get();
 }

    • deleteOperation

      public final void deleteOperation(String name)
      Deletes a long-running operation. This method indicates that the client is no longer interested in the operation result. It does not cancel the operation. If the server doesn't support this method, it returns `google.rpc.Code.UNIMPLEMENTED`.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   operationsClient.deleteOperation(name);
 }
      Parameters:
      name - The name of the operation resource to be deleted.
      Throws:
      ApiException - if the remote call fails

    • deleteOperationCallable

      public final UnaryCallable<DeleteOperationRequest,com.google.protobuf.Empty> deleteOperationCallable()
      Deletes a long-running operation. This method indicates that the client is no longer interested in the operation result. It does not cancel the operation. If the server doesn't support this method, it returns `google.rpc.Code.UNIMPLEMENTED`.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   DeleteOperationRequest request = DeleteOperationRequest.newBuilder()
     .setName(name)
     .build();
   ApiFuture<Void> future = operationsClient.deleteOperationCallable().futureCall(request);
   // Do something
   future.get();
 }

    • waitOperation

      public final Operation waitOperation(WaitOperationRequest request)
      Waits until the specified long-running operation is done or reaches at most a specified timeout, returning the latest state. If the operation is already done, the latest state is immediately returned. If the timeout specified is greater than the default HTTP/RPC timeout, the HTTP/RPC timeout is used. If the server does not support this method, it returns `google.rpc.Code.UNIMPLEMENTED`. Note that this method is on a best-effort basis. It may return the latest state before the specified timeout (including immediately), meaning even an immediate response is no guarantee that the operation is done.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   WaitOperationRequest request = WaitOperationRequest.newBuilder()
     .setName(name)
     .setTimeout(Duration.ofMillis(100))
     .build();
   Operation response = operationsClient.waitOperation(request);
 }
      Parameters:
      request - the request object containing all of the parameters for the API call.
      Throws:
      ApiException - if the remote call fails

    • waitOperationCallable

      public final UnaryCallable<WaitOperationRequest,Operation> waitOperationCallable()
      Waits until the specified long-running operation is done or reaches at most a specified timeout, returning the latest state. If the operation is already done, the latest state is immediately returned. If the timeout specified is greater than the default HTTP/RPC timeout, the HTTP/RPC timeout is used. If the server does not support this method, it returns `google.rpc.Code.UNIMPLEMENTED`. Note that this method is on a best-effort basis. It may return the latest state before the specified timeout (including immediately), meaning even an immediate response is no guarantee that the operation is done.

      Sample code: 

      
 try (OperationsClient operationsClient = OperationsClient.create()) {
   String name = "";
   WaitOperationRequest request = WaitOperationRequest.newBuilder()
     .setName(name)
     .setTimeout(Duration.ofMillis(100))
     .build();
   ApiFuture<Operation> future = operationsClient.waitOperationCallable().futureCall(request);
 }

    • close

      public final void close()
      Specified by:
      close in interface AutoCloseable

    • shutdown

      public void shutdown()
      Specified by:
      shutdown in interface BackgroundResource

    • isShutdown

      public boolean isShutdown()
      Specified by:
      isShutdown in interface BackgroundResource

    • isTerminated

      public boolean isTerminated()
      Specified by:
      isTerminated in interface BackgroundResource

    • shutdownNow

      public void shutdownNow()
      Specified by:
      shutdownNow in interface BackgroundResource

    • awaitTermination

      public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException
      Specified by:
      awaitTermination in interface BackgroundResource
      Throws:
      InterruptedException