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JUDCon 2012 Boston - The dark sides of integrat...
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Anton Arhipov
June 12, 2012
Programming
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JUDCon 2012 Boston - The dark sides of integrations
Anton Arhipov
June 12, 2012
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None
The Dark Sides of Integration Anton Arhipov JRebel, ZeroTurnaround @antonarhipov
Make a change Build, deploy, wait Observe results
Where the time goes?
Where the time goes? Build Just don’t Container start Light
containers Deployment ? Navigation Persist sessions
Where the time goes? Build Just don’t Container start Light
containers Deployment JRebel Navigation Persist sessions
@Path(“/”) public String foo() { return “FooBar”; }
@Path(“/”) public String foo() { return “FooBar”; } @Path(“/”) public
FooBar foo() { return new FooBar(); }
@Path(“/”) public String foo() { return “FooBar”; } @Path(“/foobar”) public
FooBar foo() { return new FooBar(); }
None
None
Come To The Dark Side We have cookies
Java App Framework Conf XML HTTP request
Java App Framework Conf XML HTTP request
Java App Framework Conf XML HTTP request 1) Stop request
Java App Framework Conf XML HTTP request 2) Check resources
Java App Framework Conf XML HTTP request 3) Reconfigure
Java App Framework Conf XML HTTP request 4) Resume request
Java App Framework Conf XML HTTP request PROFIT! J
How? • Load time weaving, e.g. binary patching o_O Isn’t
it dangerous?? • Well, you have to be careful J
How? • Add –javaagent to hook into class loading process
• Implement ClassFileTransformer • Use bytecode manipulation libraries (Javassist, cglib, asm) to add any custom logic java.lang.instrument
java.lang.instrument import java.lang.instrument.ClassFileTransformer; import java.lang.instrument.Instrumentation; public class Agent { public
static void premain(String args, Instrumentation inst) throws Exception { inst.addTransformer(new ClassFileTransformer { … }); } } META-INF/MANIFEST.MF Premain-Class: Agent java –javaagent:agent.jar …
java.lang.instrument import java.lang.instrument.ClassFileTransformer; import java.lang.instrument.Instrumentation; public class Agent { public
static void premain(String args, Instrumentation inst) throws Exception { inst.addTransformer(new ClassFileTransformer { … }); } } META-INF/MANIFEST.MF Premain-Class: Agent java –javaagent:agent.jar …
ClassFileTransformer new ClassFileTransformer() { public byte[] transform(ClassLoader loader, String className,
Class<?>classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer){ ClassPool cp = ClassPool.getDefault(); CtClass ct = cp.makeClass(new ByteArrayInputStream(classfileBuffer)); transformClass(ct, cp); return ct.toBytecode(); } }
ClassFileTransformer new ClassFileTransformer() { public byte[] transform(ClassLoader loader, String className,
Class<?>classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer){ ClassPool cp = ClassPool.getDefault(); CtClass ct = cp.makeClass(new ByteArrayInputStream(classfileBuffer)); transformClass(ct, cp); return ct.toBytecode(); } }
ClassFileTransformer new ClassFileTransformer() { public byte[] transform(ClassLoader loader, String className,
Class<?>classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer){ ClassPool cp = ClassPool.getDefault(); CtClass ct = cp.makeClass(new ByteArrayInputStream(classfileBuffer)); transformClass(ct, cp); return ct.toBytecode(); } }
ClassFileTransformer new ClassFileTransformer() { public byte[] transform(ClassLoader loader, String className,
Class<?>classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer){ ClassPool cp = ClassPool.getDefault(); CtClass ct = cp.makeClass(new ByteArrayInputStream(classfileBuffer)); transformClass(ct, cp); return ct.toBytecode(); } } Enter JRebel SDK
JRebel Spring plugin Weld plugin IntegrationFactory ReloaderFactory #addIntegrationProcesor (Processor) #addClassReloadListener
(Listener)
JRebel SDK class MyPlugin implements Plugin { public void preinit()
{ IntegrationFactory.getInstance(). addIntegrationProcessor( getClass().getClassLoader(), "org.jboss.Registry", new RegistryCBP()); } }
JRebel SDK class MyPlugin implements Plugin { public void preinit()
{ ReloaderFactory.getInstance(). addClassReloadListener( new ClassEventListener() { public void onClassEvent(int type, Class c) { } } }
JRebel SDK public class RegistryCBP extends JavassistClassBytecodeProcessor { public void
process(ClassPool cp, ClassLoader cl, CtClass ctClass) throws Exception { cp.importPackage("org.zeroturnaround.javarebel");
JRebel SDK public class RegistryCBP extends JavassistClassBytecodeProcessor { public void
process(ClassPool cp, ClassLoader cl, CtClass ctClass) throws Exception { cp.importPackage("org.zeroturnaround.javarebel");
JRebel SDK public class RegistryCBP extends JavassistClassBytecodeProcessor { public void
process(ClassPool cp, ClassLoader cl, CtClass ctClass) throws Exception { for (CtConstructor c : ctClass.getConstructors()) { if (c.callsSuper()) c.insertAfter("ReloaderFactory.getInstance(). ” + "addClassReloadListener($0);");
JRebel SDK public class RegistryCBP extends JavassistClassBytecodeProcessor { public void
process(ClassPool cp, ClassLoader cl, CtClass ctClass) throws Exception { ctClass.addInterface(cp.get( ClassEventListener.class.getName())); ctClass.addMethod(CtNewMethod.make( "public void onClassEvent(int type, Class clazz) {"
Javassist • Bytecode manipulation made easy • Source-level and bytecode-level
API • Uses the vocabulary of Java language • On-the-fly compilation of the injected code • http://www.jboss.org/javassist
Insert Before CtClass clazz = ... CtMethod method = clazz.getMethod(“dispatch”,
“(V)V”); m.insertBefore( “{ Reloader reloader = “ + “ReloaderFactory.getInstance();” + “reloader.checkAndReload(SomeClass.class); ” + “Config.init(); }“ );
Adding Interfaces ClassPool cp = ClassPool.getDefault(); CtClass ct = cp.get("org.judcon.Alarm");
ct.addInterface(cp.get(Listener.class.getName())); ct.addMethod(CtNewMethod.make("public void fire() { alert(); }", ct)); public interface Listener { void fire(); } public class Alarm { void alert() {} }
Adding Interfaces ClassPool cp = ClassPool.getDefault(); CtClass ct = cp.get("org.judcon.Alarm");
ct.addInterface(cp.get(Listener.class.getName())); ct.addMethod(CtNewMethod.make("public void fire() { alert(); }", ct)); public interface Listener { void fire(); } public class Alarm { void alert() {} }
Adding Interfaces ClassPool cp = ClassPool.getDefault(); CtClass ct = cp.get("org.judcon.Alarm");
ct.addInterface(cp.get(Listener.class.getName())); ct.addMethod(CtNewMethod.make("public void fire() { alert(); }", ct)); public interface Listener { void fire(); } public class Alarm { void alert() {} }
Intercept Statements ClassPool pool = ClassPool.getDefault(); CtClass ct = pool.get("org.judcon.Config");
ct.getDeclaredMethod("process") .instrument(new ExprEditor() { public void edit(NewExpr e) throws CannotCompileException { e.replace("$_ = $proceed($$);"); } });
Intercept Statements ClassPool pool = ClassPool.getDefault(); CtClass ct = pool.get("org.judcon.Config");
ct.getDeclaredMethod("process") .instrument(new ExprEditor() { public void edit(NewExpr e) throws CannotCompileException { e.replace("$_ = $proceed($$);"); } });
Copy Methods CtClass clazz = ... CtMethod m = clazz.getMethod("configure",
"(V)V"); CtMethod copy = CtNewMethod.copy( m, "__configure", clazz, null); … clazz.addMethod(CtNewMethod.make( "public void onClassEvent(int type, Class clazz) {" + "__configure();" + "} ");
Copy Methods CtClass clazz = ... CtMethod m = clazz.getMethod("configure",
"(V)V"); CtMethod copy = CtNewMethod.copy( m, "__configure", clazz, null); … clazz.addMethod(CtNewMethod.make( "public void onClassEvent(int type, Class clazz) {" + "__configure();" + "} ");
Copy Methods CtClass clazz = ... CtMethod m = clazz.getMethod("configure",
"(V)V"); CtMethod copy = CtNewMethod.copy( m, "__configure", clazz, null); … clazz.addMethod(CtNewMethod.make( "public void onClassEvent(int type, Class clazz) {" + "__configure();" + "} ");
How To Test? • Unit tests are (almost) no use
here • Requires integration testing across all platforms: – Containers / versions – JDK / versions – Framework / versions
Custom Dashboard
Thank You! Questions? @antonarhipov
[email protected]
http://www.jrebel.com