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package ru.simplex_software.web_statistics.web.servlets;
import ru.simplex_software.web_statistics.service.RequestStatisticService;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Map;
/**
* Сервлет, отдающий статистику.
*/
public class RequestStatisticServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
// Сброс статистики.
if ("reset=true".equals(request.getQueryString())) {
RequestStatisticService.resetStatistic();
response.sendRedirect(getRequestPath(request));
}
// Получение статистики.
Map<String, RequestStatisticService.RequestStatisticRecord> statistic = RequestStatisticService.getStatistic();
// Запись статистики в ответ.
response.setContentType("text/html; charset=UTF-8");
response.setCharacterEncoding("UTF-8");
response.getWriter().print(createStatisticPage(statistic, getRequestPath(request)));
}
/**
* Создание строки страницы статистики.
*
* @param statistic статистика.
* @param requestPath путь запроса.
* @return страица статистики.
*/
private String createStatisticPage(Map<String, RequestStatisticService.RequestStatisticRecord> statistic, String requestPath) {
StringBuilder builder = new StringBuilder();
builder.append("<html>");
builder.append("<head>");
builder.append("<title>Статистика по запросам</title>");
builder.append("</head>");
builder.append("<body>");
builder.append("<a href=\"").append(requestPath).append("?reset=true\">Reset</a>");
builder.append("<table>");
builder.append("<tr><th>Url</th><th>Count</th><th>Min</th><th>Max</th><th>Average</th></tr>");
for (String key : statistic.keySet()) {
builder.append("<tr>");
RequestStatisticService.RequestStatisticRecord record = statistic.get(key);
String average = String.format("%.2f", record.getAverage());
builder.append("<td>").append(key).append("</td>");
builder.append("<td>").append(record.getCount()).append("</td>");
builder.append("<td>").append(record.getMin()).append(" ms</td>");
builder.append("<td>").append(record.getMax()).append(" ms</td>");
builder.append("<td>").append(average).append(" ms</td>");
builder.append("</tr>");
}
builder.append("</table></body>");
builder.append("</html>");
return builder.toString();
}
/**
* Получение пути запроса без параметров.
*
* @param request запрос.
* @return путь запроса.
*/
private String getRequestPath(HttpServletRequest request) {
return request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getServletPath();
}
}