/*
 * Copyright 2016 Google Inc.
 *
 * Licensed 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 com.example.appengine;

import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.Query;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class StatsServlet extends HttpServlet {

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws ServletException, IOException {
    // [START stat_example]
    DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
    Entity globalStat = datastore.prepare(new Query("__Stat_Total__")).asSingleEntity();
    Long totalBytes = (Long) globalStat.getProperty("bytes");
    Long totalEntities = (Long) globalStat.getProperty("count");
    // [END stat_example]

    resp.setContentType("text/plain");
    resp.setCharacterEncoding("UTF-8");
    PrintWriter w = resp.getWriter();
    w.printf("%d bytes\n%d entities\n", totalBytes, totalEntities);
  }
}
