org.apache.openjpa.enhance
Class ClassRedefiner

java.lang.Object
  org.apache.openjpa.enhance.ClassRedefiner

public class ClassRedefiner
extends Object

Redefines the method bodies of existing classes. Supports Java 5 VMs that have a java agent installed on the command line as well as newer VMs without any -javaagent flag.

Since:

1.0.0

Constructor Summary

ClassRedefiner()

Method Summary

static boolean	canRedefineClasses(Log log)
static void	redefineClasses(OpenJPAConfiguration conf, Map<Class<?>,byte[]> classes) For each element in classes, this method will redefine all the element's methods such that field accesses are intercepted in-line.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassRedefiner

public ClassRedefiner()

Method Detail

redefineClasses

public static void redefineClasses(OpenJPAConfiguration conf,
                                   Map<Class<?>,byte[]> classes)

For each element in classes, this method will redefine all the element's methods such that field accesses are intercepted in-line. If #canRedefineClasses() returns false, this method is a no-op.

canRedefineClasses

public static boolean canRedefineClasses(Log log)

Returns:

whether or not this VM has an instrumentation installed that permits redefinition of classes. This assumes that all the arguments will be modifiable classes according to Instrumentation.isModifiableClass(java.lang.Class), and only checks whether or not an instrumentation is available and if retransformation is possible.