| /* |
| * 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.felix.systemready.impl.servlet; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| import javax.servlet.Servlet; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.felix.systemready.StateType; |
| import org.apache.felix.systemready.SystemReadyMonitor; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.http.whiteboard.HttpWhiteboardConstants; |
| import org.osgi.service.metatype.annotations.AttributeDefinition; |
| import org.osgi.service.metatype.annotations.Designate; |
| import org.osgi.service.metatype.annotations.ObjectClassDefinition; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Provide aggregated alive information using a servlet |
| */ |
| @Component( |
| name = SystemAliveServlet.PID, |
| service = Servlet.class, |
| property = { |
| HttpWhiteboardConstants.HTTP_WHITEBOARD_SERVLET_PATTERN + "=" + SystemAliveServlet.DEFAULT_PATH, |
| } |
| ) |
| @Designate(ocd=SystemAliveServlet.Config.class) |
| public class SystemAliveServlet extends HttpServlet { |
| public static final String PID = "org.apache.felix.systemready.impl.servlet.SystemAliveServlet"; |
| public static final String DEFAULT_PATH = "/systemalive"; |
| |
| private static final Logger LOG = LoggerFactory.getLogger(SystemAliveServlet.class); |
| |
| private static final long serialVersionUID = 1L; |
| |
| @ObjectClassDefinition( |
| name ="System Alive Servlet", |
| description="Servlet exposing a http endpoint for retrieving the alive status" |
| ) |
| public @interface Config { |
| |
| @AttributeDefinition(name = "Servlet Path") |
| String osgi_http_whiteboard_servlet_pattern() default SystemAliveServlet.DEFAULT_PATH; |
| |
| @AttributeDefinition(name = "Servlet Context select") |
| String osgi_http_whiteboard_context_select(); |
| |
| } |
| |
| @Reference |
| private SystemReadyMonitor monitor; |
| |
| private StatusReporter reporter; |
| |
| @Activate |
| protected void activate(final BundleContext ctx, final Map<String, Object> properties, final Config config) { |
| final String path = config.osgi_http_whiteboard_servlet_pattern(); |
| LOG.info("Registered servlet to listen on {}", path); |
| reporter = new StatusReporter(monitor, StateType.ALIVE); |
| } |
| |
| @Override |
| protected void doGet(HttpServletRequest request, HttpServletResponse response) |
| throws ServletException, IOException { |
| reporter.reportState(response); |
| } |
| |
| |
| |
| } |