/**
 * 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.hadoop.hive.shims;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.Trash;
import org.apache.hadoop.hive.shims.HadoopShims.JobTrackerState;
import org.apache.hadoop.mapred.ClusterStatus;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.TaskAttemptID;
import org.apache.hadoop.mapreduce.task.JobContextImpl;
import org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl;
import org.apache.hadoop.mapreduce.util.HostUtil;
import org.apache.hadoop.util.Progressable;

/**
 * Implemention of shims against Hadoop 0.23.0.
 */
public class Hadoop23Shims extends HadoopShimsSecure {

  @Override
  public String getTaskAttemptLogUrl(JobConf conf,
    String taskTrackerHttpAddress, String taskAttemptId)
    throws MalformedURLException {
    if (conf.get("mapreduce.framework.name") != null
      && conf.get("mapreduce.framework.name").equals("yarn")) {
      // if the cluster is running in MR2 mode, return null
      //LOG.warn("Can't fetch tasklog: TaskLogServlet is not supported in MR2 mode.");
      return null;
    } else {
      // if the cluster is running in MR1 mode, using HostUtil to construct TaskLogURL
      URL taskTrackerHttpURL = new URL(taskTrackerHttpAddress);
      return HostUtil.getTaskLogUrl(taskTrackerHttpURL.getHost(),
        Integer.toString(taskTrackerHttpURL.getPort()),
        taskAttemptId);
    }
  }

  @Override
  public JobTrackerState getJobTrackerState(ClusterStatus clusterStatus) throws Exception {
    JobTrackerState state;
    switch (clusterStatus.getJobTrackerStatus()) {
    case INITIALIZING:
      return JobTrackerState.INITIALIZING;
    case RUNNING:
      return JobTrackerState.RUNNING;
    default:
      String errorMsg = "Unrecognized JobTracker state: " + clusterStatus.getJobTrackerStatus();
      throw new Exception(errorMsg);
    }
  }

  @Override
  public org.apache.hadoop.mapreduce.TaskAttemptContext newTaskAttemptContext(Configuration conf, final Progressable progressable) {
    return new TaskAttemptContextImpl(conf, new TaskAttemptID()) {
      @Override
      public void progress() {
        progressable.progress();
      }
    };
  }

  @Override
  public org.apache.hadoop.mapreduce.JobContext newJobContext(Job job) {
    return new JobContextImpl(job.getConfiguration(), job.getJobID());
  }

  @Override
  public boolean isLocalMode(Configuration conf) {
    return "local".equals(conf.get("mapreduce.framework.name"));
  }

  @Override
  public String getJobLauncherRpcAddress(Configuration conf) {
    return conf.get("yarn.resourcemanager.address");
  }

  @Override
  public void setJobLauncherRpcAddress(Configuration conf, String val) {
    if (val.equals("local")) {
      // LocalClientProtocolProvider expects both parameters to be 'local'.
      conf.set("mapreduce.framework.name", val);
      conf.set("mapreduce.jobtracker.address", val);
    }
    else {
      conf.set("mapreduce.framework.name", "yarn");
      conf.set("yarn.resourcemanager.address", val);
    }
  }

  @Override
  public String getJobLauncherHttpAddress(Configuration conf) {
    return conf.get("yarn.resourcemanager.webapp.address");
  }

  @Override
  public long getDefaultBlockSize(FileSystem fs, Path path) {
    return fs.getDefaultBlockSize(path);
  }

  @Override
  public short getDefaultReplication(FileSystem fs, Path path) {
    return fs.getDefaultReplication(path);
  }

  @Override
  public boolean moveToAppropriateTrash(FileSystem fs, Path path, Configuration conf)
          throws IOException {
    return Trash.moveToAppropriateTrash(fs, path, conf);
  }
}