Module openj9.dtfj

Package com.ibm.j9ddr

Class J9DDRClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

com.ibm.j9ddr.J9DDRClassLoader

public class J9DDRClassLoader
extends SecureClassLoader

This ClassLoader serves two purposes. 1) Based on partitioning rules and package namespaces it ensures that certain classes are loaded once per runtime invocation while others are loaded once per CORE file being inspected. 2) Generate bytecode at runtime based on the data in the core file (or structure metadata file) for the J9 structure constants and offsets; as well as pointer classes. These classes are explicitly loaded on a per CORE file basis. The isolation is accomplished by removing the Application Class Loader from the class load delegation chain AND setting this class loader's classpath to be equal to the Application class loader's classpath. While the user may replace the application class loader with their own implementation, the application class loader MUST be a subclass of URLClassLoader.

Constructor Summary

Constructors

Constructor	Description
J9DDRClassLoader(StructureReader reader, ClassLoader parent)

Method Summary

Modifier and Type	Method	Description
StructureHeader	getHeader()
IVMData	getIVMData(IProcess process, long address)
StructureReader	getReader()	Get the structure reader used by this classloader.
Collection<StructureReader.StructureDescriptor>	getStructures()
Class<?>	loadClass(String name, boolean resolve)	Attempts to load the type className in the running VM, optionally linking the type after a successful load.
Class<?>	loadClassRelativeToStream(String name, boolean resolve)

Methods declared in class java.security.SecureClassLoader

defineClass, defineClass, getPermissions

Methods declared in class java.lang.ClassLoader

clearAssertionStatus, clone, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findClass, findLibrary, findLoadedClass, findResource, findResource, findResources, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods declared in class java.lang.Object

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

Constructor Details

J9DDRClassLoader

public J9DDRClassLoader(StructureReader reader,
 ClassLoader parent)

Method Details

getHeader

public StructureHeader getHeader()

loadClassRelativeToStream

public Class<?> loadClassRelativeToStream(String name,
 boolean resolve)
                                   throws ClassNotFoundException

Throws:

ClassNotFoundException

loadClass

public Class<?> loadClass(String name,
 boolean resolve)
                   throws ClassNotFoundException

Description copied from class: java.lang.ClassLoader

Attempts to load the type className in the running VM, optionally linking the type after a successful load.

Overrides:

loadClass in class ClassLoader

Parameters:

name - String the name of the class to search for.

resolve - boolean indicates if class should be resolved after loading.

Returns:

java.lang.Class the Class object.

Throws:

ClassNotFoundException - If the class could not be found.

getStructures

public Collection<StructureReader.StructureDescriptor> getStructures()

getIVMData

public IVMData getIVMData(IProcess process,
 long address)
                   throws ClassNotFoundException,
IllegalAccessException,
InstantiationException

Throws:

ClassNotFoundException

IllegalAccessException

InstantiationException

getReader

public StructureReader getReader()

Get the structure reader used by this classloader.

Returns: