runtime/master/src/main/java/org/apache/nemo/runtime/master/servlet/JobMetricServlet.java

/*
 * 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.nemo.runtime.master.servlet;

import org.apache.nemo.runtime.common.metric.JobMetric;
import org.apache.nemo.runtime.master.metric.MetricStore;

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

/**
 * Servlet which handles {@link JobMetric} metric request.
 */
public final class JobMetricServlet extends HttpServlet {

  @Override
  protected void doGet(final HttpServletRequest request, final HttpServletResponse response)
    throws IOException {
    final MetricStore metricStore = MetricStore.getStore();
    response.setContentType("application/json");
    response.setStatus(HttpServletResponse.SC_OK);
    response.getWriter().println(metricStore.dumpMetricToJson(JobMetric.class));
  }
}