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Google Cloud Dataflow Java SDK provides a simple, Java-based interface for processing virtually any size data using Google cloud resources. This artifact includes entire Dataflow Java SDK.

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/*
 * Copyright (C) 2015 Google Inc.
 *
 * 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.dataflow.sdk.runners.inprocess;

import com.google.cloud.dataflow.sdk.runners.inprocess.InProcessPipelineRunner.InProcessEvaluationContext;
import com.google.cloud.dataflow.sdk.transforms.AppliedPTransform;

import java.util.Objects;

/**
 * A (Transform, Pipeline Execution) key for stateful evaluators.
 *
 * Source evaluators are stateful to ensure data is not read multiple times. Evaluators are cached
 * to ensure that the reader is not restarted if the evaluator is retriggered. An
 * {@link EvaluatorKey} is used to ensure that multiple Pipelines can be executed without sharing
 * the same evaluators.
 */
final class EvaluatorKey {
  private final AppliedPTransform transform;
  private final InProcessEvaluationContext context;

  public EvaluatorKey(AppliedPTransform transform, InProcessEvaluationContext context) {
    this.transform = transform;
    this.context = context;
  }

  @Override
  public int hashCode() {
    return Objects.hash(transform, context);
  }

  @Override
  public boolean equals(Object other) {
    if (other == null || !(other instanceof EvaluatorKey)) {
      return false;
    }
    EvaluatorKey that = (EvaluatorKey) other;
    return Objects.equals(this.transform, that.transform)
        && Objects.equals(this.context, that.context);
  }
}