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Java idiomatic client for Google Cloud Firestore.
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/*
 * Copyright 2021 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
 *
 *       http://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.firestore;

import com.google.api.core.ApiFunction;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutureCallback;
import com.google.api.core.ApiFutures;
import com.google.api.core.SettableApiFuture;
import com.google.common.util.concurrent.MoreExecutors;
import io.grpc.Status;

/**
 * Represents a single write for BulkWriter, encapsulating operation dispatch and error handling.
 */
class BulkWriterOperation {
  private final SettableApiFuture operationFuture = SettableApiFuture.create();
  private final DocumentReference documentReference;
  private final BulkWriter.OperationType operationType;
  private final ApiFunction scheduleWriteCallback;
  private final ApiFunction> successListener;
  private final ApiFunction> errorListener;

  /**
   * The default initial backoff time in milliseconds after an error. Set to 1s according to
   * https://cloud.google.com/apis/design/errors.
   */
  public static final int DEFAULT_BACKOFF_INITIAL_DELAY_MS = 1000;

  /** The default maximum backoff time in milliseconds when retrying an operation. */
  public static final int DEFAULT_BACKOFF_MAX_DELAY_MS = 60 * 1000;

  /** The default factor to increase the backup by after each failed attempt. */
  public static final double DEFAULT_BACKOFF_FACTOR = 1.5;

  private int failedAttempts = 0;
  private Status lastStatus;

  private int backoffDuration = 0;

  /**
   * @param documentReference The document reference being written to.
   * @param operationType The type of operation that created this write.
   * @param scheduleWriteCallback The callback used to schedule a new write.
   * @param successListener The user-provided success handler.
   * @param errorListener The user-provided error handler.
   */
  BulkWriterOperation(
      DocumentReference documentReference,
      BulkWriter.OperationType operationType,
      ApiFunction scheduleWriteCallback,
      ApiFunction> successListener,
      ApiFunction> errorListener) {
    this.documentReference = documentReference;
    this.operationType = operationType;
    this.scheduleWriteCallback = scheduleWriteCallback;
    this.successListener = successListener;
    this.errorListener = errorListener;
  }

  /**
   * Returns an ApiFuture that resolves when the operation completes (either successfully or failed
   * after all retry attempts are exhausted).
   */
  public ApiFuture getFuture() {
    return operationFuture;
  }

  public DocumentReference getDocumentReference() {
    return documentReference;
  }

  public int getBackoffDuration() {
    return backoffDuration;
  }

  /** Callback invoked when an operation attempt fails. */
  public ApiFuture onException(FirestoreException exception) {
    ++failedAttempts;

    final BulkWriterException bulkWriterException =
        new BulkWriterException(
            exception.getStatus(),
            exception.getMessage(),
            documentReference,
            operationType,
            failedAttempts);

    final SettableApiFuture callbackFuture = SettableApiFuture.create();

    ApiFutures.addCallback(
        this.errorListener.apply(bulkWriterException),
        new ApiFutureCallback() {
          @Override
          public void onFailure(Throwable throwable) {
            operationFuture.setException(throwable);
            callbackFuture.set(null);
          }

          @Override
          public void onSuccess(Boolean shouldRetry) {
            if (shouldRetry) {
              lastStatus = bulkWriterException.getStatus();
              updateBackoffDuration();
              scheduleWriteCallback.apply(BulkWriterOperation.this);
            } else {
              operationFuture.setException(bulkWriterException);
            }
            callbackFuture.set(null);
          }
        },
        MoreExecutors.directExecutor());

    return callbackFuture;
  }

  private void updateBackoffDuration() {
    if (lastStatus == Status.RESOURCE_EXHAUSTED) {
      backoffDuration = DEFAULT_BACKOFF_MAX_DELAY_MS;
    } else if (backoffDuration == 0) {
      backoffDuration = DEFAULT_BACKOFF_INITIAL_DELAY_MS;
    } else {
      backoffDuration *= DEFAULT_BACKOFF_FACTOR;
    }
  }

  /** Callback invoked when the operation succeeds. */
  public ApiFuture onSuccess(final WriteResult result) {
    final SettableApiFuture callbackFuture = SettableApiFuture.create();
    ApiFutures.addCallback(
        this.successListener.apply(result),
        new ApiFutureCallback() {
          @Override
          public void onFailure(Throwable throwable) {
            operationFuture.setException(throwable);
            callbackFuture.set(null);
          }

          @Override
          public void onSuccess(Void aVoid) {
            operationFuture.set(result);
            callbackFuture.set(null);
          }
        },
        MoreExecutors.directExecutor());
    return callbackFuture;
  }
}