| // Copyright (C) 2017 The Android Open Source Project |
| // |
| // 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.ericsson.gerrit.plugins.highavailability.health; |
| |
| import static javax.servlet.http.HttpServletResponse.SC_NO_CONTENT; |
| import static javax.servlet.http.HttpServletResponse.SC_SERVICE_UNAVAILABLE; |
| |
| import com.google.inject.Singleton; |
| import java.io.IOException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Singleton |
| public class HealthServlet extends HttpServlet { |
| private static final Logger log = LoggerFactory.getLogger(HealthServlet.class); |
| private static final long serialVersionUID = -1L; |
| |
| private boolean healthy; |
| |
| HealthServlet() { |
| this.healthy = true; |
| } |
| |
| @Override |
| protected void doPost(HttpServletRequest req, HttpServletResponse rsp) { |
| this.healthy = true; |
| rsp.setStatus(SC_NO_CONTENT); |
| } |
| |
| @Override |
| protected void doDelete(HttpServletRequest req, HttpServletResponse rsp) { |
| this.healthy = false; |
| rsp.setStatus(SC_NO_CONTENT); |
| } |
| |
| @Override |
| protected void doGet(HttpServletRequest req, HttpServletResponse rsp) { |
| if (healthy) { |
| rsp.setStatus(SC_NO_CONTENT); |
| } else { |
| try { |
| rsp.sendError(SC_SERVICE_UNAVAILABLE); |
| } catch (IOException e) { |
| log.error("Failed to send error response", e); |
| } |
| } |
| } |
| } |