org.springframework.boot.devtools.restart.AgentReloader.java Source code

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Here is the source code for org.springframework.boot.devtools.restart.AgentReloader.java

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/*
 * Copyright 2012-2019 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.boot.devtools.restart;

import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

import org.springframework.util.ClassUtils;

/**
 * Utility to determine if an Java agent based reloader (e.g. JRebel) is being used.
 *
 * @author Phillip Webb
 * @since 1.3.0
 */
public abstract class AgentReloader {

    private static final Set<String> AGENT_CLASSES;

    static {
        Set<String> agentClasses = new LinkedHashSet<>();
        agentClasses.add("org.zeroturnaround.javarebel.Integration");
        agentClasses.add("org.zeroturnaround.javarebel.ReloaderFactory");
        agentClasses.add("org.hotswap.agent.HotswapAgent");
        AGENT_CLASSES = Collections.unmodifiableSet(agentClasses);
    }

    private AgentReloader() {
    }

    /**
     * Determine if any agent reloader is active.
     * @return true if agent reloading is active
     */
    public static boolean isActive() {
        return isActive(null) || isActive(AgentReloader.class.getClassLoader())
                || isActive(ClassLoader.getSystemClassLoader());
    }

    private static boolean isActive(ClassLoader classLoader) {
        for (String agentClass : AGENT_CLASSES) {
            if (ClassUtils.isPresent(agentClass, classLoader)) {
                return true;
            }
        }
        return false;
    }

}