content: /*
   * 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
   *
   *     https://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.avro.mapred.tether;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.nio.ByteBuffer;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.avro.ipc.SaslSocketServer;
  import org.apache.avro.ipc.specific.SpecificResponder;
  import org.apache.avro.ipc.Server;
  import org.apache.avro.ipc.jetty.HttpServer;
  
  /**
   * Java implementation of a tether executable. Useless except for testing, since
   * it's already possible to write Java MapReduce programs without tethering.
   * Also serves as an example of how a framework may be implemented.
   */
  public class TetherTaskRunner implements InputProtocol {
    static final Logger LOG = LoggerFactory.getLogger(TetherTaskRunner.class);
  
    private Server inputServer;
    private TetherTask task;
  
    public TetherTaskRunner(TetherTask task) throws IOException {
      this.task = task;
  
      // determine what protocol we are using
      String protocol = System.getenv("AVRO_TETHER_PROTOCOL");
      if (protocol == null) {
        throw new RuntimeException("AVRO_TETHER_PROTOCOL env var is null");
      }
  
      protocol = protocol.trim().toLowerCase();
  
      TetheredProcess.Protocol proto;
      if (protocol.equals("http")) {
        LOG.info("Use HTTP protocol");
        proto = TetheredProcess.Protocol.HTTP;
      } else if (protocol.equals("sasl")) {
        LOG.info("Use SASL protocol");
        proto = TetheredProcess.Protocol.SASL;
      } else {
        throw new RuntimeException("AVRO_TETHER_PROTOCOL=" + protocol + " but this protocol is unsupported");
      }
  
      InetSocketAddress iaddress = new InetSocketAddress(0);
  
      switch (proto) {
      case SASL:
        // start input server
        this.inputServer = new SaslSocketServer(new SpecificResponder(InputProtocol.class, this), iaddress);
        LOG.info("Started SaslSocketServer on port:" + iaddress.getPort());
        break;
  
      case HTTP:
        this.inputServer = new HttpServer(new SpecificResponder(InputProtocol.class, this), iaddress.getPort());
  
        LOG.info("Started HttpServer on port:" + iaddress.getPort());
        break;
      }
  
      inputServer.start();
  
      // open output to parent
      task.open(inputServer.getPort());
    }
  
    @Override
    public void configure(TaskType taskType, String inSchema, String outSchema) {
      LOG.info("got configure");
      task.configure(taskType, inSchema, outSchema);
    }
  
    @Override
    public synchronized void input(ByteBuffer data, long count) {
      task.input(data, count);
    }
  
    @Override
    public void partitions(int partitions) {
      task.partitions(partitions);
    }
  
    @Override
    public void abort() {
      LOG.info("got abort");
      close();
    }
  
    @Override
    public synchronized void complete() {
      LOG.info("got input complete");
      task.complete();
    }
  
    /** Wait for task to complete. */
    public void join() throws InterruptedException {
      LOG.info("TetherTaskRunner: Start join.");
      inputServer.join();
      LOG.info("TetherTaskRunner: Finish join.");
    }
  
    private void close() {
      LOG.info("Closing the task");
      task.close();
      LOG.info("Finished closing the task.");
      if (inputServer != null)
        inputServer.close();
    }
  }
  