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makes it easier to understand why a user has access to a resource or doesn't have permission to call an API. Given an email, resource, and permission, Policy Troubleshooter examines all Identity and Access Management (IAM) policies that apply to the resource. It then reveals whether the member's roles include the permission on that resource and, if so, which policies bind the member to those roles.

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/*
 * Copyright 2024 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.cloud.policytroubleshooter.iam.v3.stub;

import com.google.api.gax.core.BackgroundResource;
import com.google.api.gax.core.BackgroundResourceAggregation;
import com.google.api.gax.grpc.GrpcCallSettings;
import com.google.api.gax.grpc.GrpcStubCallableFactory;
import com.google.api.gax.rpc.ClientContext;
import com.google.api.gax.rpc.UnaryCallable;
import com.google.cloud.policytroubleshooter.iam.v3.TroubleshootIamPolicyRequest;
import com.google.cloud.policytroubleshooter.iam.v3.TroubleshootIamPolicyResponse;
import com.google.longrunning.stub.GrpcOperationsStub;
import io.grpc.MethodDescriptor;
import io.grpc.protobuf.ProtoUtils;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javax.annotation.Generated;

// AUTO-GENERATED DOCUMENTATION AND CLASS.
/**
 * gRPC stub implementation for the PolicyTroubleshooter service API.
 *
 * This class is for advanced usage and reflects the underlying API directly.
 */
@Generated("by gapic-generator-java")
public class GrpcPolicyTroubleshooterStub extends PolicyTroubleshooterStub {
  private static final MethodDescriptor
      troubleshootIamPolicyMethodDescriptor =
          MethodDescriptor.newBuilder()
              .setType(MethodDescriptor.MethodType.UNARY)
              .setFullMethodName(
                  "google.cloud.policytroubleshooter.iam.v3.PolicyTroubleshooter/TroubleshootIamPolicy")
              .setRequestMarshaller(
                  ProtoUtils.marshaller(TroubleshootIamPolicyRequest.getDefaultInstance()))
              .setResponseMarshaller(
                  ProtoUtils.marshaller(TroubleshootIamPolicyResponse.getDefaultInstance()))
              .build();

  private final UnaryCallable
      troubleshootIamPolicyCallable;

  private final BackgroundResource backgroundResources;
  private final GrpcOperationsStub operationsStub;
  private final GrpcStubCallableFactory callableFactory;

  public static final GrpcPolicyTroubleshooterStub create(PolicyTroubleshooterStubSettings settings)
      throws IOException {
    return new GrpcPolicyTroubleshooterStub(settings, ClientContext.create(settings));
  }

  public static final GrpcPolicyTroubleshooterStub create(ClientContext clientContext)
      throws IOException {
    return new GrpcPolicyTroubleshooterStub(
        PolicyTroubleshooterStubSettings.newBuilder().build(), clientContext);
  }

  public static final GrpcPolicyTroubleshooterStub create(
      ClientContext clientContext, GrpcStubCallableFactory callableFactory) throws IOException {
    return new GrpcPolicyTroubleshooterStub(
        PolicyTroubleshooterStubSettings.newBuilder().build(), clientContext, callableFactory);
  }

  /**
   * Constructs an instance of GrpcPolicyTroubleshooterStub, 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.
   */
  protected GrpcPolicyTroubleshooterStub(
      PolicyTroubleshooterStubSettings settings, ClientContext clientContext) throws IOException {
    this(settings, clientContext, new GrpcPolicyTroubleshooterCallableFactory());
  }

  /**
   * Constructs an instance of GrpcPolicyTroubleshooterStub, 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.
   */
  protected GrpcPolicyTroubleshooterStub(
      PolicyTroubleshooterStubSettings settings,
      ClientContext clientContext,
      GrpcStubCallableFactory callableFactory)
      throws IOException {
    this.callableFactory = callableFactory;
    this.operationsStub = GrpcOperationsStub.create(clientContext, callableFactory);

    GrpcCallSettings
        troubleshootIamPolicyTransportSettings =
            GrpcCallSettings
                .newBuilder()
                .setMethodDescriptor(troubleshootIamPolicyMethodDescriptor)
                .build();

    this.troubleshootIamPolicyCallable =
        callableFactory.createUnaryCallable(
            troubleshootIamPolicyTransportSettings,
            settings.troubleshootIamPolicySettings(),
            clientContext);

    this.backgroundResources =
        new BackgroundResourceAggregation(clientContext.getBackgroundResources());
  }

  public GrpcOperationsStub getOperationsStub() {
    return operationsStub;
  }

  @Override
  public UnaryCallable
      troubleshootIamPolicyCallable() {
    return troubleshootIamPolicyCallable;
  }

  @Override
  public final void close() {
    try {
      backgroundResources.close();
    } catch (RuntimeException e) {
      throw e;
    } catch (Exception e) {
      throw new IllegalStateException("Failed to close resource", e);
    }
  }

  @Override
  public void shutdown() {
    backgroundResources.shutdown();
  }

  @Override
  public boolean isShutdown() {
    return backgroundResources.isShutdown();
  }

  @Override
  public boolean isTerminated() {
    return backgroundResources.isTerminated();
  }

  @Override
  public void shutdownNow() {
    backgroundResources.shutdownNow();
  }

  @Override
  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
    return backgroundResources.awaitTermination(duration, unit);
  }
}