001/* 002 * Copyright 2012-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.devtools.autoconfigure; 018 019import org.apache.commons.logging.Log; 020import org.apache.commons.logging.LogFactory; 021 022import org.springframework.beans.factory.InitializingBean; 023import org.springframework.boot.devtools.livereload.LiveReloadServer; 024 025/** 026 * Manages an optional {@link LiveReloadServer}. The {@link LiveReloadServer} may 027 * gracefully fail to start (e.g. because of a port conflict) or may be omitted entirely. 028 * 029 * @author Phillip Webb 030 * @since 1.3.0 031 */ 032public class OptionalLiveReloadServer implements InitializingBean { 033 034 private static final Log logger = LogFactory.getLog(OptionalLiveReloadServer.class); 035 036 private LiveReloadServer server; 037 038 /** 039 * Create a new {@link OptionalLiveReloadServer} instance. 040 * @param server the server to manage or {@code null} 041 */ 042 public OptionalLiveReloadServer(LiveReloadServer server) { 043 this.server = server; 044 } 045 046 @Override 047 public void afterPropertiesSet() throws Exception { 048 startServer(); 049 } 050 051 void startServer() throws Exception { 052 if (this.server != null) { 053 try { 054 if (!this.server.isStarted()) { 055 this.server.start(); 056 } 057 logger.info( 058 "LiveReload server is running on port " + this.server.getPort()); 059 } 060 catch (Exception ex) { 061 logger.warn("Unable to start LiveReload server"); 062 logger.debug("Live reload start error", ex); 063 this.server = null; 064 } 065 } 066 } 067 068 /** 069 * Trigger LiveReload if the server is up and running. 070 */ 071 public void triggerReload() { 072 if (this.server != null) { 073 this.server.triggerReload(); 074 } 075 } 076 077}