nl.topicus.jdbc.shaded.com.google.api.gax.rpc.OperationCallableImpl Maven / Gradle / Ivy

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 * Copyright 2016, Google LLC All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google LLC nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package nl.topicus.jdbc.shaded.com.google.api.gax.rpc;

import static nl.topicus.jdbc.shaded.com.google.common.base.Preconditions.checkNotNull;

import nl.topicus.jdbc.shaded.com.google.api.core.ApiFunction;
import nl.topicus.jdbc.shaded.com.google.api.core.ApiFuture;
import nl.topicus.jdbc.shaded.com.google.api.gax.longrunning.OperationFuture;
import nl.topicus.jdbc.shaded.com.google.api.gax.longrunning.OperationFutureImpl;
import nl.topicus.jdbc.shaded.com.google.api.gax.longrunning.OperationSnapshot;
import nl.topicus.jdbc.shaded.com.google.api.gax.retrying.RetryingExecutor;
import nl.topicus.jdbc.shaded.com.google.api.gax.retrying.RetryingFuture;

/**
 * An OperationCallableImpl is an immutable object which is capable of initiating RPC calls to
 * long-running API methods and returning a {@link OperationFuture} to manage the polling of the
 * Operation and getting the response.
 *
 * Package-private for internal use.
 */
class OperationCallableImpl
    extends OperationCallable {

  private final UnaryCallable initialCallable;
  private final RetryingExecutor executor;
  private final LongRunningClient longRunningClient;
  private final ApiFunction responseTransformer;
  private final ApiFunction metadataTransformer;

  OperationCallableImpl(
      UnaryCallable initialCallable,
      RetryingExecutor executor,
      LongRunningClient longRunningClient,
      OperationCallSettings operationCallSettings) {
    this.initialCallable = checkNotNull(initialCallable);
    this.executor = checkNotNull(executor);
    this.longRunningClient = checkNotNull(longRunningClient);
    this.responseTransformer = operationCallSettings.getResponseTransformer();
    this.metadataTransformer = operationCallSettings.getMetadataTransformer();
  }

  /**
   * Initiates an operation asynchronously. If the {@link TransportChannel} encapsulated in the
   * given {@link ApiCallContext} is null, a channel must have already been bound at construction
   * time.
   *
   * @param request The request to initiate the operation.
   * @param context {@link ApiCallContext} to make the call with
   * @return {@link OperationFuture} for the call result
   */
  @Override
  public OperationFuture futureCall(
      RequestT request, ApiCallContext context) {
    return futureCall(initialCallable.futureCall(request, context));
  }

  OperationFutureImpl futureCall(ApiFuture initialFuture) {
    RecheckingCallable callable =
        new RecheckingCallable<>(
            new OperationCheckingCallable(longRunningClient, initialFuture), executor);

    RetryingFuture pollingFuture = callable.futureCall(null, null);
    return new OperationFutureImpl<>(
        pollingFuture, initialFuture, responseTransformer, metadataTransformer);
  }

  /**
   * Creates a new {@link OperationFuture} to watch an operation that has been initiated previously.
   * Note: This is not type-safe at static time; the result type can only be checked once the
   * operation finishes.
   *
   * @param operationName The name of the operation to resume.
   * @param context {@link ApiCallContext} to make the call with
   * @return {@link OperationFuture} for the call result.
   */
  @Override
  public OperationFuture resumeFutureCall(
      String operationName, ApiCallContext context) {
    return futureCall(longRunningClient.getOperationCallable().futureCall(operationName, context));
  }

  /**
   * Sends a cancellation request to the server for the operation with name {@code operationName}.
   *
   * @param operationName The name of the operation to cancel.
   * @param context {@link ApiCallContext} to make the call with
   * @return the future which completes once the operation is canceled on the server side.
   */
  @Override
  public ApiFuture cancel(String operationName, ApiCallContext context) {
    return longRunningClient.cancelOperationCallable().futureCall(operationName, context);
  }
}