Example usage for java.lang.instrument Instrumentation addTransformer

Introduction

In this page you can find the example usage for java.lang.instrument Instrumentation addTransformer.

Prototype

void addTransformer(ClassFileTransformer transformer, boolean canRetransform);

Source Link

Document

Registers the supplied transformer.

Usage

From source file:com.xiaoqq.practise.threadmonitor.Agent.java

public static void premain(String arg, Instrumentation instrumentation) {

    System.out.println("Start to create thread monitor Agent.");
    Agent agent = new Agent();
    instrumentation.addTransformer(agent, true);
    /*/*www .  j a  v a2 s  .com*/
    Class[] allClasses = instrumentation.getAllLoadedClasses();
    for (Class c : allClasses) {
    if (!c.isInterface() && instrumentation.isModifiableClass(c)) {
        try {
            instrumentation.retransformClasses(c);
        } catch (Exception e) {
            System.err.println("Cannot retransform class. Exception: " + e);
            e.printStackTrace();
            System.exit(1);
        }
    }
    }   */
}

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From source file:de.codesourcery.asm.rewrite.ProfilingClassTransformer.java

public static void premain(String agentArgs, Instrumentation inst) {
    // parse options
    final Map<String, String> options = parseArgs(agentArgs);

    if (StringUtils.isBlank(options.get(OPTION_PACKAGES))) {
        throw new RuntimeException(
                "Agent " + ProfilingClassTransformer.class.getName() + " requires the 'packages=....' option");
    }/*from   w ww  . jav  a 2s  . c  o m*/

    final boolean debug = options.containsKey(OPTION_DEBUG);

    final String[] packages = options.get(OPTION_PACKAGES).split(",");

    if (ArrayUtils.isEmpty(packages)) {
        throw new RuntimeException("Agent " + ProfilingClassTransformer.class.getName()
                + " requires at least one pattern with the 'packages=....' option");
    }

    if (debug) {
        System.out.println(
                "ProfilingClassTransformer activated (packages: " + StringUtils.join(packages, " , ") + ")");
    }

    final IJoinpointFilter filter = new IJoinpointFilter() {

        @Override
        public boolean matches(String clazz, String methodName) {
            return true;
        }

        @Override
        public boolean matches(String clazz) {
            for (String p : packages) {
                if (clazz.contains(p)) {
                    return true;
                }
            }
            return false;
        }
    };

    final File debugOutputDir = options.containsKey(OPTION_DEBUG_WRITE_CLASSFILES)
            ? new File(options.get(OPTION_DEBUG_WRITE_CLASSFILES))
            : null;
    inst.addTransformer(new MyTransformer(filter, debug, debugOutputDir), false); // no re-transformation support
}

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