Java tutorial
/**************************************************************** * 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.james.http.jetty; import java.util.List; import java.util.stream.Collectors; import javax.servlet.Filter; import javax.servlet.Servlet; import org.apache.commons.configuration.HierarchicalConfiguration; import org.apache.james.http.jetty.Configuration.Builder; public class JettyHttpServerFactory { public List<JettyHttpServer> createServers(HierarchicalConfiguration config) throws Exception { List<HierarchicalConfiguration> configs = config.configurationsAt("httpserver"); return configs.stream().map(this::buildConfiguration).map(JettyHttpServer::create) .collect(Collectors.toList()); } private Configuration buildConfiguration(HierarchicalConfiguration serverConfig) { Builder builder = Configuration.builder(); boolean randomPort = serverConfig.getBoolean("port[@random]", false); Integer port = serverConfig.getInteger("port[@fixed]", null); if (randomPort && port != null) { throw new ConfigurationException("Random port is not compatible with fixed port"); } if (randomPort) { builder.randomPort(); } if (port != null) { builder.port(port); } for (HierarchicalConfiguration mapping : serverConfig.configurationsAt("mappings.mapping")) { String classname = mapping.getString("servlet"); Class<? extends Servlet> servletClass = findServlet(classname); builder.serve(mapping.getString("path")).with(servletClass); } for (HierarchicalConfiguration mapping : serverConfig.configurationsAt("filters.mapping")) { String classname = mapping.getString("filter"); Class<? extends Filter> filterClass = findFilter(classname); builder.filter(mapping.getString("path")).with(filterClass); } return builder.build(); } @SuppressWarnings("unchecked") private Class<? extends Servlet> findServlet(String classname) { try { return (Class<? extends Servlet>) ClassLoader.getSystemClassLoader().loadClass(classname); } catch (ClassNotFoundException e) { throw new ConfigurationException(String.format("'%s' servlet cannot be found", classname), e); } } @SuppressWarnings("unchecked") private Class<? extends Filter> findFilter(String classname) { try { return (Class<? extends Filter>) ClassLoader.getSystemClassLoader().loadClass(classname); } catch (ClassNotFoundException e) { throw new ConfigurationException(String.format("'%s' filter cannot be found", classname), e); } } }