/**
 * 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.hive.service.servlet;

import org.apache.hadoop.hive.ql.QueryInfo;
import org.apache.hive.service.cli.operation.OperationManager;
import org.apache.hive.service.cli.session.SessionManager;
import org.apache.hive.tmpl.QueryProfileTmpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Renders a query page
 */
public class QueryProfileServlet extends HttpServlet {
  private static final Logger LOG = LoggerFactory.getLogger(QueryProfileServlet.class);

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    String opId = (String) request.getParameter("operationId");
    ServletContext ctx = getServletContext();
    SessionManager sessionManager =
      (SessionManager)ctx.getAttribute("hive.sm");
    OperationManager opManager = sessionManager.getOperationManager();
    QueryInfo queryInfo = opManager.getQueryInfo(opId);
    if (queryInfo == null) {
      LOG.debug("No display object found for operation {} ", opId);
      return;
    }

    new QueryProfileTmpl().render(response.getWriter(), queryInfo);
  }
}