/**
 * 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;

/**
 * The class is synchronized, as WebUI may access information about a running query.
 */
public class QueryInfo {

  private final String userName;
  private final String executionEngine;
  private final long beginTime;
  private final String operationId;
  private Long runtime;  // tracks only running portion of the query.

  private Long endTime;
  private String state;
  private QueryDisplay queryDisplay;

  public QueryInfo(String state, String userName, String executionEngine, String operationId) {
    this.state = state;
    this.userName = userName;
    this.executionEngine = executionEngine;
    this.beginTime = System.currentTimeMillis();
    this.operationId = operationId;
  }

  public synchronized long getElapsedTime() {
    if (isRunning()) {
      return System.currentTimeMillis() - beginTime;
    } else {
      return endTime - beginTime;
    }
  }

  public synchronized boolean isRunning() {
    return endTime == null;
  }

  public synchronized QueryDisplay getQueryDisplay() {
    return queryDisplay;
  }

  public synchronized void setQueryDisplay(QueryDisplay queryDisplay) {
    this.queryDisplay = queryDisplay;
  }

  public String getUserName() {
    return userName;
  }

  public String getExecutionEngine() {
    return executionEngine;
  }

  public synchronized String getState() {
    return state;
  }

  public long getBeginTime() {
    return beginTime;
  }

  public synchronized Long getEndTime() {
    return endTime;
  }

  public synchronized void updateState(String state) {
    this.state = state;
  }

  public String getOperationId() {
    return operationId;
  }

  public synchronized void setEndTime() {
    this.endTime = System.currentTimeMillis();
  }

  public synchronized void setRuntime(long runtime) {
    this.runtime = runtime;
  }

  public synchronized Long getRuntime() {
    return runtime;
  }
}