Java tutorial
/* * Copyright (c) 2014 Intellectual Reserve, Inc. All rights reserved. * * 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 cf.spring; import cf.component.VarzAggregator; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ObjectNode; import org.springframework.web.HttpRequestHandler; import org.springframework.web.servlet.handler.AbstractUrlHandlerMapping; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; /** * @author Mike Heath <elcapo@gmail.com> */ public class VarzHandlerMapping extends AbstractUrlHandlerMapping { private final ObjectMapper mapper = new ObjectMapper(); public VarzHandlerMapping(VarzAggregator aggregator, HttpBasicAuthenticator authenticator) { this(aggregator, authenticator, Integer.MIN_VALUE); } public VarzHandlerMapping(final VarzAggregator aggregator, final HttpBasicAuthenticator authenticator, int order) { setOrder(order); registerHandler("/varz", new HttpRequestHandler() { @Override public void handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException { if (httpServletRequest.getMethod().equalsIgnoreCase("GET")) { if (authenticator.authenticate(httpServletRequest, httpServletResponse)) { httpServletResponse.setContentType("application/json;charset=utf-8"); final ObjectNode varz = aggregator.aggregateVarz(); mapper.writeValue(httpServletResponse.getOutputStream(), varz); } } else { httpServletResponse.setStatus(HttpServletResponse.SC_METHOD_NOT_ALLOWED); } } }); } }