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Server functionality for HBase

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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.hbase.tool;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.hbase.tmpl.tool.CanaryStatusTmpl;
import org.apache.yetus.audience.InterfaceAudience;

@InterfaceAudience.Private
public class CanaryStatusServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException {
    CanaryTool.RegionStdOutSink sink =
      (CanaryTool.RegionStdOutSink) getServletContext().getAttribute("sink");
    if (sink == null) {
      throw new ServletException(
        "RegionStdOutSink is null! The CanaryTool's InfoServer is not initialized correctly");
    }

    resp.setContentType("text/html");

    CanaryStatusTmpl tmpl = new CanaryStatusTmpl();
    tmpl.render(resp.getWriter(), sink);
  }

}