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

/*
 * Copyright 2017, Google LLC All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * 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
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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.ApiFuture;
import nl.topicus.jdbc.shaded.com.google.api.core.ApiFutures;
import nl.topicus.jdbc.shaded.com.google.api.gax.longrunning.OperationSnapshot;
import java.util.concurrent.ExecutionException;

/**
 * A future callable which relies on callback chaining to execute server polling (asking for a
 * status of a specific operation: in progress, completed, canceled etc.). This implementation is
 * called from {@link AttemptCallable}, essentially using for polling the same logic which is used
 * for retrying.
 *
 * Package-private for internal use.
 *
 * @param  type of the request
 */
class OperationCheckingCallable extends UnaryCallable {
  private final LongRunningClient longRunningClient;
  private final ApiFuture initialFuture;

  OperationCheckingCallable(
      LongRunningClient longRunningClient, ApiFuture initialFuture) {
    this.longRunningClient = checkNotNull(longRunningClient);
    this.initialFuture = checkNotNull(initialFuture);
  }

  /**
   * This method is supposed to be called from {@link AttemptCallable#call()}
   *
   * @param request request
   * @param context call context
   */
  @Override
  public ApiFuture futureCall(RequestT request, ApiCallContext context) {
    try {
      if (!initialFuture.isDone() || initialFuture.isCancelled()) {
        return initialFuture;
      }
      // Since initialFuture is done at this point, the following call should be non-blocking
      OperationSnapshot initialOperation = initialFuture.get();

      // Note Future.isDone() and Operation.getDone() are two fundamentally different things.
      if (initialOperation.isDone()) {
        return initialFuture;
      }

      return longRunningClient.getOperationCallable().futureCall(initialOperation.getName(), null);
    } catch (ExecutionException e) {
      return ApiFutures.immediateFailedFuture(e.getCause());
    } catch (InterruptedException e) {
      return ApiFutures.immediateFailedFuture(e);
    }
  }
}