examples/beam/src/test/java/org/apache/nemo/examples/beam/policy/PolicyTestUtil.java

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 * to you 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
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 * Unless required by applicable law or agreed to in writing,
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package org.apache.nemo.examples.beam.policy;

import org.apache.nemo.compiler.optimizer.pass.compiletime.CompileTimePass;
import org.apache.nemo.compiler.optimizer.pass.compiletime.annotating.DefaultParallelismPass;

import java.util.List;

/**
 * Test util for testing policies.
 */
public final class PolicyTestUtil {
  /**
   * Overwrite the parallelism of existing policy.
   *
   * @param desiredSourceParallelism     the desired source parallelism to set.
   * @param compileTimePassesToOverwrite the list of compile time passes to overwrite.
   * @return the overwritten policy.
   */
  public static List<CompileTimePass> overwriteParallelism(final int desiredSourceParallelism,
                                                           final List<CompileTimePass> compileTimePassesToOverwrite) {
    final int parallelismPassIdx = compileTimePassesToOverwrite.indexOf(new DefaultParallelismPass());
    compileTimePassesToOverwrite.set(parallelismPassIdx,
      new DefaultParallelismPass(desiredSourceParallelism, 2));
    return compileTimePassesToOverwrite;
  }
}