spring-loaded SpringLoadedAgent 源码
spring-loaded SpringLoadedAgent 代码
文件路径：/springloaded/src/main/java/org/springsource/loaded/agent/SpringLoadedAgent.java
/*
* Copyright 2010-2014 VMware and contributors
*
* 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.springsource.loaded.agent;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.Instrumentation;
/**
* Basic agent implementation. This agent is declared in the META-INF/MANIFEST.MF file - that is how it is 'plugged in'
* to the JVM when '-javaagent:springloaded.jar' is used.
*
* @author Andy Clement
* @since 0.5.0
*/
public class SpringLoadedAgent {
private static ClassFileTransformer transformer = new ClassPreProcessorAgentAdapter();
private static Instrumentation instrumentation;
public static void premain(String options, Instrumentation inst) {
// Handle duplicate agents
if (instrumentation != null) {
return;
}
instrumentation = inst;
instrumentation.addTransformer(transformer);
}
public static void agentmain(String options, Instrumentation inst) {
if (instrumentation != null) {
return;
}
instrumentation = inst;
instrumentation.addTransformer(transformer);
}
/**
* @return the Instrumentation instance
*/
public static Instrumentation getInstrumentation() {
if (instrumentation == null) {
throw new UnsupportedOperationException("Java 5 was not started with preMain -javaagent for SpringLoaded");
}
return instrumentation;
}
}
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