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/**
 * 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.ql.log;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.QueryPlan;
import org.apache.hadoop.hive.ql.session.SessionState;

/**
 * PerfLogger.
 *
 * Can be used to measure and log the time spent by a piece of code.
 */
public class PerfLogger {
  public static final String ACQUIRE_READ_WRITE_LOCKS = "acquireReadWriteLocks";
  public static final String COMPILE = "compile";
  public static final String PARSE = "parse";
  public static final String ANALYZE = "semanticAnalyze";
  public static final String DO_AUTHORIZATION = "doAuthorization";
  public static final String DRIVER_EXECUTE = "Driver.execute";
  public static final String INPUT_SUMMARY = "getInputSummary";
  public static final String GET_SPLITS = "getSplits";
  public static final String RUN_TASKS = "runTasks";
  public static final String SERIALIZE_PLAN = "serializePlan";
  public static final String DESERIALIZE_PLAN = "deserializePlan";
  public static final String CLONE_PLAN = "clonePlan";
  public static final String TASK = "task.";
  public static final String RELEASE_LOCKS = "releaseLocks";
  public static final String PRUNE_LISTING = "prune-listing";
  public static final String PARTITION_RETRIEVING = "partition-retrieving";
  public static final String PRE_HOOK = "PreHook.";
  public static final String POST_HOOK = "PostHook.";
  public static final String FAILURE_HOOK = "FailureHook.";
  public static final String DRIVER_RUN = "Driver.run";
  public static final String TIME_TO_SUBMIT = "TimeToSubmit";
  public static final String TEZ_SUBMIT_TO_RUNNING = "TezSubmitToRunningDag";
  public static final String TEZ_BUILD_DAG = "TezBuildDag";
  public static final String TEZ_SUBMIT_DAG = "TezSubmitDag";
  public static final String TEZ_RUN_DAG = "TezRunDag";
  public static final String TEZ_CREATE_VERTEX = "TezCreateVertex.";
  public static final String TEZ_RUN_VERTEX = "TezRunVertex.";
  public static final String TEZ_INITIALIZE_PROCESSOR = "TezInitializeProcessor";
  public static final String TEZ_RUN_PROCESSOR = "TezRunProcessor";
  public static final String TEZ_INIT_OPERATORS = "TezInitializeOperators";
  public static final String LOAD_HASHTABLE = "LoadHashtable";
  public static final String ORC_GET_SPLITS = "OrcGetSplits";

  protected static final ThreadLocal perfLogger = new ThreadLocal();

  protected final Map startTimes = new HashMap();
  protected final Map endTimes = new HashMap();

  static final private Log LOG = LogFactory.getLog(PerfLogger.class.getName());

  public PerfLogger() {
    // Use getPerfLogger to get an instance of PerfLogger
  }

  public static PerfLogger getPerfLogger() {
    return getPerfLogger(false);
  }

  /**
   * Call this function to get an instance of PerfLogger.
   *
   * Use resetPerfLogger to require a new instance.  Useful at the beginning of execution.
   *
   * @return Session perflogger if there's a sessionstate, otherwise return the thread local instance
   */
  public static PerfLogger getPerfLogger(boolean resetPerfLogger) {
    if (SessionState.get() == null) {
      if (perfLogger.get() == null || resetPerfLogger) {
        perfLogger.set(new PerfLogger());
      }
      return perfLogger.get();
    } else {
      return SessionState.get().getPerfLogger(resetPerfLogger);
    }
  }

  /**
   * Call this function when you start to measure time spent by a piece of code.
   * @param _log the logging object to be used.
   * @param method method or ID that identifies this perf log element.
   */
  public void PerfLogBegin(String callerName, String method) {
    long startTime = System.currentTimeMillis();
    LOG.info("");
    startTimes.put(method, new Long(startTime));
  }

  /**
   * Call this function in correspondence of PerfLogBegin to mark the end of the measurement.
   * @param _log
   * @param method
   * @return long duration  the difference between now and startTime, or -1 if startTime is null
   */
  public long PerfLogEnd(String callerName, String method) {
    Long startTime = startTimes.get(method);
    long endTime = System.currentTimeMillis();
    long duration = -1;

    endTimes.put(method, new Long(endTime));

    StringBuilder sb = new StringBuilder("");
    LOG.info(sb);

    return duration;
  }

  /**
   * Call this function at the end of processing a query (any time after the last call to PerfLogEnd
   * for a given query) to run any cleanup/final steps that need to be run
   * @param _log
   */
  public void close(Log _log, QueryPlan queryPlan) {

  }

  public Long getStartTime(String method) {
    return startTimes.get(method);
  }

  public Long getEndTime(String method) {
    return endTimes.get(method);
  }
}