MapReduceProgramWorkflowRunner.java

/*
 * Copyright © 2014-2016 Cask Data, 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 co.cask.cdap.internal.app.runtime.workflow;

import co.cask.cdap.api.app.ApplicationSpecification;
import co.cask.cdap.api.mapreduce.MapReduceSpecification;
import co.cask.cdap.api.workflow.WorkflowNodeState;
import co.cask.cdap.api.workflow.WorkflowSpecification;
import co.cask.cdap.api.workflow.WorkflowToken;
import co.cask.cdap.app.program.Program;
import co.cask.cdap.app.runtime.ProgramOptions;
import co.cask.cdap.app.runtime.ProgramRunnerFactory;
import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.proto.ProgramType;
import com.google.common.base.Preconditions;

import java.util.Map;

/**
 * A {@link ProgramWorkflowRunner} that creates {@link Runnable} for executing MapReduce job from Workflow.
 */
final class MapReduceProgramWorkflowRunner extends AbstractProgramWorkflowRunner {

  MapReduceProgramWorkflowRunner(CConfiguration cConf, WorkflowSpecification workflowSpec,
                                 ProgramRunnerFactory programRunnerFactory,
                                 Program workflowProgram, ProgramOptions workflowProgramOptions, WorkflowToken token,
                                 String nodeId, Map<String, WorkflowNodeState> nodeStates) {
    super(cConf, workflowProgram, workflowProgramOptions,
          programRunnerFactory, workflowSpec, token, nodeId, nodeStates);
  }

  @Override
  protected ProgramType getProgramType() {
    return ProgramType.MAPREDUCE;
  }

  @Override
  protected Program rewriteProgram(String name, Program program) {
    ApplicationSpecification spec = program.getApplicationSpecification();
    MapReduceSpecification mapReduceSpec = spec.getMapReduce().get(name);
    Preconditions.checkArgument(mapReduceSpec != null,
                                "No MapReduce with name %s found in Application %s", name, spec.getName());

    return new WorkflowMapReduceProgram(program, mapReduceSpec);
  }
}