content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.web;
  
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.util.ThreadUtils;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.io.PrintStream;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * Stacks servlet to display the stacks of this process.
   */
  public class StacksServlet extends HttpServlet {
    private static final long serialVersionUID = 4190506509049119126L;
    private static final Logger LOG = LoggerFactory.getLogger(StacksServlet.class);
  
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {
      resp.setContentType("text/plain; charset=UTF-8");
      try (PrintStream out = new PrintStream(
          resp.getOutputStream(), false, "UTF-8")) {
        ThreadUtils.printThreadInfo(out, "");
      }
      if (Configuration.getBoolean(PropertyKey.WEB_THREAD_DUMP_TO_LOG)) {
        ThreadUtils.logThreadInfo(LOG, "jsp requested", 1);
      }
    }
  }
  