heron/api/src/java/org/apache/heron/streamlet/Runner.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * 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
 *
 * 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 org.apache.heron.streamlet;

import org.apache.heron.api.HeronSubmitter;
import org.apache.heron.api.exception.AlreadyAliveException;
import org.apache.heron.api.exception.InvalidTopologyException;
import org.apache.heron.api.topology.TopologyBuilder;
import org.apache.heron.streamlet.impl.BuilderImpl;

/**
 * Runner is used to run a topology that is built by the builder.
 * It exports a sole function called run that takes care of constructing the topology
 */
public final class Runner {
  public Runner() { }

  /**
   * Runs the computation
   * @param name The name of the topology
   * @param config Any config that is passed to the topology
   * @param builder The builder used to keep track of the sources.
   */
  public void run(String name, Config config, Builder builder) {
    BuilderImpl bldr = (BuilderImpl) builder;
    TopologyBuilder topologyBuilder = bldr.build();
    try {
      HeronSubmitter.submitTopology(name, config.getHeronConfig(),
                                    topologyBuilder.createTopology());
    } catch (AlreadyAliveException | InvalidTopologyException e) {
      e.printStackTrace();
    }
  }
}