Examples with ClassPool javassist.ClassPool used on opensource projects

Example 6 with ClassPool

use of javassist.ClassPool in project jersey by jersey.

the class PerfTestAgent method premain.

public static void premain(String agentArgs, Instrumentation instrumentation) {
    final String handlerClassName = (agentArgs != null && !agentArgs.isEmpty()) ? agentArgs.substring(0, agentArgs.lastIndexOf('.')) : HANDLER_CLASS_NAME;
    final String handlerMethodName = (agentArgs != null && !agentArgs.isEmpty()) ? agentArgs.substring(agentArgs.lastIndexOf('.') + 1) : HANDLER_METHOD_NAME;
    instrumentation.addTransformer(new ClassFileTransformer() {

        @Override
        public byte[] transform(ClassLoader loader, String className, Class<?> aClass, ProtectionDomain protectionDomain, byte[] bytes) throws IllegalClassFormatException {
            if (handlerClassName.replaceAll("\\.", "/").equals(className)) {
                try {
                    ClassPool cp = ClassPool.getDefault();
                    cp.appendSystemPath();
                    CtClass cc = cp.makeClass(new java.io.ByteArrayInputStream(bytes));
                    final CtField ctxField = CtField.make("public static final agent.metrics.Timer.Context agentTimerCtx;", cc);
                    final CtField registryField = CtField.make("public static final agent.metrics.MetricRegistry agentREG = new agent.metrics.MetricRegistry();", cc);
                    final CtField reporterField = CtField.make("public static final agent.metrics.JmxReporter agentReporter = agent.metrics.JmxReporter.forRegistry(agentREG).build();", cc);
                    final CtField timerField = CtField.make("public static final agent.metrics.Timer agentTimer = " + "agentREG.timer(agent.metrics.MetricRegistry.name(\"" + handlerClassName + "\", new String[] {\"" + handlerMethodName + "\"}));", cc);
                    cc.addField(registryField);
                    cc.addField(reporterField);
                    cc.addField(timerField);
                    cc.makeClassInitializer().insertAfter("agentReporter.start();");
                    CtMethod m = cc.getDeclaredMethod(handlerMethodName);
                    m.addLocalVariable("agentCtx", ctxField.getType());
                    m.insertBefore("agentCtx = agentTimer.time();");
                    m.insertAfter("agentCtx.stop();", true);
                    byte[] byteCode = cc.toBytecode();
                    cc.detach();
                    System.out.printf("Jersey Perf Agent Instrumentation Done! (instrumented method: %s)\n", m.getLongName());
                    return byteCode;
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
            return null;
        }
    });
}

Example 7 with ClassPool

use of javassist.ClassPool in project hibernate-orm by hibernate.

the class MapProxyTool method generate.

/**
	 * Protected for test only
	 */
protected static Class generate(String className, Map<String, Class<?>> properties) {
    try {
        ClassPool pool = ClassPool.getDefault();
        CtClass cc = pool.makeClass(className);
        cc.addInterface(resolveCtClass(Serializable.class));
        cc.addField(new CtField(resolveCtClass(Map.class), "theMap", cc));
        cc.addConstructor(generateConstructor(className, cc));
        for (Entry<String, Class<?>> entry : properties.entrySet()) {
            // add getter
            cc.addMethod(generateGetter(cc, entry.getKey(), entry.getValue()));
            // add setter
            cc.addMethod(generateSetter(cc, entry.getKey(), entry.getValue()));
        }
        return cc.toClass();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

Example 8 with ClassPool

use of javassist.ClassPool in project hibernate-orm by hibernate.

the class EnhancerTestUtils method enhanceAndDecompile.

/**
	 * method that performs the enhancement of a class
	 * also checks the signature of enhanced entities methods using 'javap' decompiler
	 */
public static Class<?> enhanceAndDecompile(Class<?> classToEnhance, ClassLoader cl) throws Exception {
    CtClass entityCtClass = generateCtClassForAnEntity(classToEnhance);
    byte[] original = entityCtClass.toBytecode();
    byte[] enhanced = Environment.getBytecodeProvider().getEnhancer(new EnhancerTestContext()).enhance(entityCtClass.getName(), original);
    assertFalse("entity was not enhanced", enhanced == null);
    log.infof("enhanced entity [%s]", entityCtClass.getName());
    ClassPool cp = new ClassPool(false);
    cp.appendClassPath(new LoaderClassPath(cl));
    CtClass enhancedCtClass = cp.makeClass(new ByteArrayInputStream(enhanced));
    enhancedCtClass.debugWriteFile(workingDir);
    DecompileUtils.decompileDumpedClass(workingDir, classToEnhance.getName());
    Class<?> enhancedClass = enhancedCtClass.toClass(cl, EnhancerTestUtils.class.getProtectionDomain());
    assertNotNull(enhancedClass);
    return enhancedClass;
}

Example 9 with ClassPool

use of javassist.ClassPool in project pinpoint by naver.

the class TestBootstrapClass method test.

@Test
public void test() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException, IOException, CannotCompileException {
    URLClassLoader classLoader = new URLClassLoader(new URL[] {});
    LoaderClassPath loaderClassPath = new LoaderClassPath(classLoader);
    ClassPool cp = new ClassPool();
    cp.appendClassPath(loaderClassPath);
    CtClass ctClass = cp.makeClass(TEST_CLASS_NAME);
    byte[] bytes = ctClass.toBytecode();
    logger.debug(classLoader.getClass().getName());
    Class<?> aClass = BytecodeUtils.defineClass(classLoader, TEST_CLASS_NAME, bytes);
    logger.debug("{}", aClass.getName());
}

Example 10 with ClassPool

use of javassist.ClassPool in project pinpoint by naver.

the class JavaAssistTest method setUp.

@Before
public void setUp() throws Exception {
    pool = new ClassPool();
    pool.appendSystemPath();
}