org.zeroturnaround.javarebel.integration.support

Class CBPs

java.lang.Object

org.zeroturnaround.javarebel.integration.support.CBPs

public abstract class CBPs
extends Object

This class provides a fluent API for processing classes. It can be used to create two types of processors: direct and delayed. A direct processor takes a ClassPool and a CtClass and performs all the proccessing directly on the given CtClass instance. A delayed processor gathers a bunch of processing commands, and can later execute them all on a given CtClass. A delayed processor is also a JavassistClassBytecodeProcessor.

The process method is used to create a direct processor. Methods like implement(Class) and implement(String) are used to create delayed processors.

Here is how one would use a direct processor:

 CBPs.process(cp, ctClass)
     .importPackage("org.zeroturnaround.javarebel")
     .importPackage("org.zeroturnaround.javarebel.integration.util")
     
     .addInterface(ClassEventListener.class)
     
     .addLoggerField("jrLog", "MyPlugin")
     
     .addMethod("" +
         "public void onClassEvent(int eventType, Class klass) {" +
         "  jrLog.info(\"Class reload event received for \" + klass);" +
         "}")
     
     .addMethod("" +
         "public int priority() {" +
         "  return PRIORITY_DEFAULT;" +
         "}")
     
     .insertAfterLeafCtors("{" +
         "  ReloaderFactory.getInstance().addClassReloadListener(WeakUtil.weakCEL(this));" +
         "}");
 

Here is how one could use a delayed processor in a plugin class to implement simple one method interfaces:

 integration.addIntegrationProcessor(
   "com.ibm.ws.jaxws.webcontainer.LibertyJaxWsServlet",
   CBPs.implement(JrLibertyJaxWsServlet.class)
       .withMethod("" +
           "public void setWsEndpointInfo(Object epInfo) {" +
           "  endpoint.setEndpointInfo(epInfo);" +
           "}"));
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CBPs.DelayedProcessor
static interface	CBPs.DirectProcessor

Constructor Summary

Constructors

Constructor and Description
CBPs()

Method Summary

Modifier and Type	Method and Description
static CBPs.DelayedProcessor	implement(Class intf)
static CBPs.DelayedProcessor	implement(String intfName)
static CBPs.DirectProcessor	process(org.zeroturnaround.bundled.javassist.ClassPool cp, org.zeroturnaround.bundled.javassist.CtClass ctClass)
static org.zeroturnaround.bundled.javassist.expr.ExprEditor	replaceMethodCall(String methodName, String src) Creates an ExprEditor that replaces a method call with given source code.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CBPs

public CBPs()

Method Detail

implement

public static CBPs.DelayedProcessor implement(String intfName)

implement

public static CBPs.DelayedProcessor implement(Class intf)

process

public static CBPs.DirectProcessor process(org.zeroturnaround.bundled.javassist.ClassPool cp,
                                           org.zeroturnaround.bundled.javassist.CtClass ctClass)

replaceMethodCall

public static org.zeroturnaround.bundled.javassist.expr.ExprEditor replaceMethodCall(String methodName,
                                                                                     String src)

Creates an ExprEditor that replaces a method call with given source code. Example usage:

 CBPs.process(cp, ctClass)
     .instrument("createPersistentAutomaticTimers",
         CBPs.replaceMethodCall("existsTaskGroup", "$_ = false;"))