/*
 * 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.gobblin.cluster;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Arrays;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Charsets;


class SingleTaskRunnerMain {
  private static final Logger logger = LoggerFactory.getLogger(SingleTaskRunnerMain.class);

  private final SingleTaskRunnerBuilder builder;

  SingleTaskRunnerMain(final SingleTaskRunnerBuilder builder) {
    this.builder = builder;
  }

  public static void main(final String[] args) {
    logger.info("SingleTaskRunnerMain starting. args: " + Arrays.toString(args));
    final SingleTaskRunnerMain runnerMain = new SingleTaskRunnerMain(new SingleTaskRunnerBuilder());
    try {
      runnerMain.run(args);
    } catch (final Exception e) {
      logger.error("Got an exception running a single task.", e);
      System.exit(1);
    }
  }

  void run(final String[] args)
      throws IOException, InterruptedException {
    final OutputStreamWriter streamWriter = new OutputStreamWriter(System.out, Charsets.UTF_8);
    final PrintWriter writer = new PrintWriter(streamWriter, true);
    final SingleTaskRunnerMainOptions options = new SingleTaskRunnerMainOptions(args, writer);
    final SingleTaskRunner runner =
        this.builder.setClusterConfigFilePath(options.getClusterConfigFilePath())
            .setJobId(options.getJobId())
            .setWorkUnitFilePath(options.getWorkUnitFilePath())
            .createSingleTaskRunner();
    runner.run();
  }
}
