001/* 002 * Copyright 2012-2017 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.restart; 018 019import java.util.Collections; 020import java.util.LinkedHashSet; 021import java.util.Set; 022 023import org.springframework.util.ClassUtils; 024 025/** 026 * Utility to determine if an Java agent based reloader (e.g. JRebel) is being used. 027 * 028 * @author Phillip Webb 029 * @since 1.3.0 030 */ 031public abstract class AgentReloader { 032 033 private static final Set<String> AGENT_CLASSES; 034 035 static { 036 Set<String> agentClasses = new LinkedHashSet<>(); 037 agentClasses.add("org.zeroturnaround.javarebel.Integration"); 038 agentClasses.add("org.zeroturnaround.javarebel.ReloaderFactory"); 039 agentClasses.add("org.hotswap.agent.HotswapAgent"); 040 AGENT_CLASSES = Collections.unmodifiableSet(agentClasses); 041 } 042 043 private AgentReloader() { 044 } 045 046 /** 047 * Determine if any agent reloader is active. 048 * @return true if agent reloading is active 049 */ 050 public static boolean isActive() { 051 return isActive(null) || isActive(AgentReloader.class.getClassLoader()) 052 || isActive(ClassLoader.getSystemClassLoader()); 053 } 054 055 private static boolean isActive(ClassLoader classLoader) { 056 for (String agentClass : AGENT_CLASSES) { 057 if (ClassUtils.isPresent(agentClass, classLoader)) { 058 return true; 059 } 060 } 061 return false; 062 } 063 064}