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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) 2016 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.InMemoryWatermarkManager.TimerUpdate;
import com.google.cloud.dataflow.sdk.runners.inprocess.InMemoryWatermarkManager.TransformWatermarks;
import com.google.cloud.dataflow.sdk.util.BaseExecutionContext;
import com.google.cloud.dataflow.sdk.util.ExecutionContext;
import com.google.cloud.dataflow.sdk.util.TimerInternals;
import com.google.cloud.dataflow.sdk.util.common.worker.StateSampler;
import com.google.cloud.dataflow.sdk.util.state.CopyOnAccessInMemoryStateInternals;

/**
 * Execution Context for the {@link InProcessPipelineRunner}.
 *
 * 
This implementation is not thread safe. A new {@link InProcessExecutionContext} must be
 * created for each thread that requires it.
 */
class InProcessExecutionContext
    extends BaseExecutionContext {
  private final Clock clock;
  private final StructuralKey key;
  private final CopyOnAccessInMemoryStateInternals existingState;
  private final TransformWatermarks watermarks;

  public InProcessExecutionContext(Clock clock, StructuralKey key,
      CopyOnAccessInMemoryStateInternals existingState, TransformWatermarks watermarks) {
    this.clock = clock;
    this.key = key;
    this.existingState = existingState;
    this.watermarks = watermarks;
  }

  @Override
  protected InProcessStepContext createStepContext(
      String stepName, String transformName, StateSampler stateSampler) {
    return new InProcessStepContext(this, stepName, transformName);
  }

  /**
   * Step Context for the {@link InProcessPipelineRunner}.
   */
  public class InProcessStepContext
      extends com.google.cloud.dataflow.sdk.util.BaseExecutionContext.StepContext {
    private CopyOnAccessInMemoryStateInternals stateInternals;
    private InProcessTimerInternals timerInternals;

    public InProcessStepContext(
        ExecutionContext executionContext, String stepName, String transformName) {
      super(executionContext, stepName, transformName);
    }

    @Override
    public CopyOnAccessInMemoryStateInternals stateInternals() {
      if (stateInternals == null) {
        stateInternals = CopyOnAccessInMemoryStateInternals.withUnderlying(key, existingState);
      }
      return stateInternals;
    }

    @Override
    public InProcessTimerInternals timerInternals() {
      if (timerInternals == null) {
        timerInternals =
            InProcessTimerInternals.create(clock, watermarks, TimerUpdate.builder(key));
      }
      return timerInternals;
    }

    /**
     * Commits the state of this step, and returns the committed state. If the step has not
     * accessed any state, return null.
     */
    public CopyOnAccessInMemoryStateInternals commitState() {
      if (stateInternals != null) {
        return stateInternals.commit();
      }
      return null;
    }

    /**
     * Gets the timer update of the {@link TimerInternals} of this {@link InProcessStepContext},
     * which is empty if the {@link TimerInternals} were never accessed.
     */
    public TimerUpdate getTimerUpdate() {
      if (timerInternals == null) {
        return TimerUpdate.empty();
      }
      return timerInternals.getTimerUpdate();
    }
  }
}

 















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