com.google.gwt.dev.shell

Class CompilingClassLoader

java.lang.Object

java.lang.ClassLoader

com.google.gwt.dev.shell.CompilingClassLoader

All Implemented Interfaces:

DispatchIdOracle

public final class CompilingClassLoader
extends ClassLoader
implements DispatchIdOracle

An isolated ClassLoader for running all user code. All user files are compiled from source code byte a ByteCodeCompiler. After compilation, some byte code rewriting is performed to support JavaScriptObject and its subtypes. TODO: we should refactor this class to move the getClassInfoByDispId, getDispId, getMethodDispatch and putMethodDispatch into a separate entity since they really do not interact with the CompilingClassLoader functionality.

Constructor Summary

Constructors

Constructor and Description
CompilingClassLoader(TreeLogger logger, CompilationState compilationState, ShellJavaScriptHost javaScriptHost)

Method Summary

Modifier and Type	Method and Description
protected Class<?>	findClass(String className)
Object	getCachedJso(int uniqueId) Retrieves the mapped JSO for a given unique id, provided the id was previously cached and the JSO has not been garbage collected.
DispatchClassInfo	getClassInfoByDispId(int dispId) Returns the DispatchClassInfo for a given dispatch id.
int	getDispId(String jsniMemberRef) Returns the dispatch id for a JSNI member reference.
Object	getWrapperForObject(Object javaObject) Retrieves the mapped wrapper for a given Java Object, provided the wrapper was previously cached and has not been garbage collected.
protected Class<?>	loadClass(String name, boolean resolve) Remove some of the excess locking that we'd normally inherit from loadClass.
void	putCachedJso(int uniqueId, Object jso) Weakly caches a given JSO by unique id.
void	putWrapperForObject(Object javaObject, Object wrapper) Weakly caches a wrapper for a given Java Object.

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Constructor Detail

CompilingClassLoader

public CompilingClassLoader(TreeLogger logger,
                            CompilationState compilationState,
                            ShellJavaScriptHost javaScriptHost)
                     throws UnableToCompleteException

Throws:

UnableToCompleteException

Method Detail

getCachedJso

public Object getCachedJso(int uniqueId)

Retrieves the mapped JSO for a given unique id, provided the id was previously cached and the JSO has not been garbage collected.

Parameters:

uniqueId - the previously stored unique id

Returns:

the mapped JSO, or null if the id was not previously mapped or if the JSO has been garbage collected

getClassInfoByDispId

public DispatchClassInfo getClassInfoByDispId(int dispId)

Returns the DispatchClassInfo for a given dispatch id.

Specified by:

getClassInfoByDispId in interface DispatchIdOracle

Parameters:

dispId - dispatch identifier

Returns:

DispatchClassInfo for a given dispatch id or null if one does not exist

getDispId

public int getDispId(String jsniMemberRef)

Returns the dispatch id for a JSNI member reference.

Specified by:

getDispId in interface DispatchIdOracle

Parameters:

jsniMemberRef - a JSNI member reference

Returns:

dispatch id or -1 if the JSNI member reference could not be found

getWrapperForObject

public Object getWrapperForObject(Object javaObject)

Retrieves the mapped wrapper for a given Java Object, provided the wrapper was previously cached and has not been garbage collected.

Parameters:

javaObject - the Object being wrapped

Returns:

the mapped wrapper, or null if the Java object mapped or if the wrapper has been garbage collected

putCachedJso

public void putCachedJso(int uniqueId,
                         Object jso)

Weakly caches a given JSO by unique id. A cached JSO can be looked up by unique id until it is garbage collected.

Parameters:

uniqueId - a unique id associated with the JSO

jso - the value to cache

putWrapperForObject

public void putWrapperForObject(Object javaObject,
                                Object wrapper)

Weakly caches a wrapper for a given Java Object.

Parameters:

javaObject - the Object being wrapped

wrapper - the mapped wrapper

findClass

protected Class<?> findClass(String className)
                      throws ClassNotFoundException

Overrides:

findClass in class ClassLoader

Throws:

ClassNotFoundException

loadClass

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

Remove some of the excess locking that we'd normally inherit from loadClass.

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException