"

 COPYRIGHT (c) 1996-2015 by Claus Gittinger

 New code and modifications done at SWING Research Group [1]:

 COPYRIGHT (c) 2010-2015 by Jan Vrany, Jan Kurs and Marcel Hlopko

                            SWING Research Group, Czech Technical University in Prague

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

 [1] Code written at SWING Research Group contains a signature

     of one of the above copright owners. For exact set of such code,

     see the differences between this version and version stx:libjava

     as of 1.9.2010

"

"{ Package: 'stx:libjava' }"

"{ NameSpace: Smalltalk }"

JavaClassEnvironment subclass:#JavaClassRegistry

	instanceVariableNames:'vm loaders notifier lock erroneous'

	classVariableNames:''

	poolDictionaries:'JavaVMData'

	category:'Languages-Java-Support'

!

!JavaClassRegistry class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1996-2015 by Claus Gittinger

 New code and modifications done at SWING Research Group [1]:

 COPYRIGHT (c) 2010-2015 by Jan Vrany, Jan Kurs and Marcel Hlopko

                            SWING Research Group, Czech Technical University in Prague

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

 [1] Code written at SWING Research Group contains a signature

     of one of the above copright owners. For exact set of such code,

     see the differences between this version and version stx:libjava

     as of 1.9.2010

"

! !

!JavaClassRegistry class methodsFor:'instance creation'!

for: aJavaVM

    ^self new setVM: aJavaVM.

    "Created: / 21-12-2010 / 19:42:55 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

new

    ^ self basicNew initialize.

    "Modified (format): / 30-10-2011 / 12:07:09 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaClassRegistry class methodsFor:'others'!

version_HG

    ^ '$Changeset: <not expanded> $'

! !

!JavaClassRegistry methodsFor:'accessing'!

classForName: className loader: classLoader ifAbsent: aBlock

    "Get class loaded by given classLoader from registry or evaluate aBlock if class is not yet registered"

    | classes class |

    self assert: (className includes: $.) not.

    "Classes loaded by primordial classloader are always

     used"

    classLoader notNil ifTrue:[

        classes := loaders at: nil ifAbsent: nil.

        class := classes at: className ifAbsent: nil.

        class notNil ifTrue:[

            ^class.

        ]

    ].

    "No bootstrap class found, search given classloader"

    classes := loaders at: classLoader ifAbsent: [^aBlock value].

    ^classes at: className ifAbsent: aBlock

    "Modified: / 21-10-2011 / 12:39:04 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

    "Created: / 23-10-2011 / 11:40:56 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

classForName: className loader: classLoader ifAbsentPut: block

    "Get class loaded by classLoader from registry. if absent block is evaluated and resulting class in registered in registry, "

    | class synchronizer |

    self assert: (className includes: $.) not.

    "/ Temporary workaround for race-condition when multiple threads are

    "/ loading same class. Note that ClassLoader.loadClass() / loadClassInternal()

    "/ is itself sychronized so we have to synchronize iff and only iff

    "/ we're loading for primordial class loader. If we synchronize

    "/ even on non-primordial loaders, we risk a deadlock. Very hacky...

    synchronizer := classLoader isNil

                        ifTrue:[ [:whatToDo | lock critical: whatToDo ] ]

                        ifFalse:[ [:whatToDo | whatToDo value ] ].

    synchronizer value:[

        "If class is already registered with the same cl, just return it"

        class := self classNamed: className loader: classLoader.

        class isNil ifTrue:[

            "Otherwise evaluate block"

            class := block value.

            (class notNil and:[classLoader isNil]) ifTrue: [ self registerClass: class ].

        ].

    ].

    ^ class

    "Created: / 21-10-2011 / 12:00:30 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

    "Created: / 23-10-2011 / 11:36:51 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 02-11-2011 / 17:29:20 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

    "Modified: / 11-08-2014 / 01:23:10 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

classNamed: className

    "Return a class for given classname loaded by 'current classloader' or

     nil if not yet loaded"

    ^self classNamed: className loader: JavaClassReader classLoaderQuerySignal query

    "Created: / 23-10-2011 / 12:23:23 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

classNamed: className loader: classLoader

    "Return a class for given classname loaded by given classloader or

     nil if not yet loaded"

    ^self classForName: className loader: classLoader ifAbsent:[nil].

    "Created: / 23-10-2011 / 12:23:02 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

classes

    ^Iterator on:[:whatToDo|self allClassesDo: whatToDo]

    "Created: / 23-10-2011 / 20:14:28 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 09-04-2014 / 18:43:28 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

erroneous

    "Return a list of classes that contain compilation errors"

    | classes |

    erroneous isNil ifTrue:[ ^ #() ].

    lock critical:[

        classes := erroneous copy.

    ].

    ^ classes.

    "

    JavaVM registry erroneous

    "

    "Created: / 20-09-2016 / 23:00:16 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 21-09-2016 / 10:34:07 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

systemPackage: syspkg

    "Return name (as string) of system package named syspkg or nil if no such package is loaded"

    | classes syspkgSlashed |

    classes := loaders at: nil ifAbsent:[nil].

    classes isEmptyOrNil ifTrue:[ ^ #() ].

    syspkgSlashed := syspkg copyReplaceAll: $. with: $/.

    classes keysDo:[:name|

        (name startsWith:syspkgSlashed) ifTrue:[

            ^ syspkg

        ]

    ].

    ^ nil

    "Created: / 16-08-2012 / 17:40:38 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

systemPackages

    "Return a collection system packages (as smalltalk strings) currently loaded"

    | classes syspkgs |

    classes := loaders at: nil ifAbsent:[nil].

    classes isEmptyOrNil ifTrue:[ ^ #() ].

    syspkgs := Set new.

    classes keysDo:[:name|

        | slashpos |

        slashpos := name lastIndexOf: $/.

        slashpos ~~ 0 ifTrue:[

            | syspkg |

            syspkg := name copyTo: slashpos - 1.

            syspkg replaceAll: $/ with: $..

            syspkgs add: syspkg.

        ]

    ].

    ^syspkgs

    "Created: / 16-08-2012 / 17:32:35 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaClassRegistry methodsFor:'class loading'!

loadFile: aFilename

    "reads a class from aFilename, installs and returns it."

    | aClass |

    self breakPoint: #mh.

    aClass := JavaClassReader readFile: aFilename ignoring: Set new.

    aClass isJavaClass ifFalse:[self breakPoint:#mh].

    self registerClass: aClass.

    ^ aClass.

    "Created: / 15-04-1996 / 14:58:53 / cg"

    "Modified: / 12-05-1998 / 22:06:52 / cg"

    "Modified: / 23-10-2011 / 11:55:36 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

loadStream: javaClassDataStream loader: aJavaClassLoader

    "reads a class from aStream and returns it.

     The JavaClass is installed as global.

     If new classes are required to be loaded, aClassLoader is

     asked to do it."

    | javaClass |

    self breakPoint: #mh.

    self breakPoint: #jv.

    javaClass := JavaClassReader readStream: javaClassDataStream loader: aJavaClassLoader.

    javaClass isNil ifTrue: [

            Logger

                log: 'JavaClassReader was not able to read given data stream'

                severity: Logger severityWARN

                facility: #JVM.

            self breakPoint: #mh.

            ^ nil.

        ].

    javaClass isJavaClass ifFalse: [ self breakPoint: #mh. ].

    javaClass classLoader: aJavaClassLoader.

    self registerClass: javaClass.

    ^ javaClass

    "Modified: / 02-03-2015 / 14:07:44 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaClassRegistry methodsFor:'enumerating'!

allClassesDo: aBlock

    loaders do:[:classes|

        classes do:[:class|

            aBlock value: class

        ]

    ]

    "Created: / 09-04-2014 / 18:43:17 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaClassRegistry methodsFor:'helpers'!

addClassLoader: aJavaClassLoader

loaders at: aJavaClassLoader put: Dictionary new.

!

getClassesDefinedBy:classLoader

    ^loaders at: classLoader ifAbsent: [nil].

! !

!JavaClassRegistry methodsFor:'initialization'!

flush

    notifier stopAndRemoveAll.

    self initialize.

    "Modified: / 30-11-2013 / 07:03:16 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

initialize

    loaders := WeakIdentityDictionary new.

    loaders at: nil put: Dictionary new.

    notifier := BackgroundQueueProcessingJob

                    named: 'Java class registry notifier'

                    on:[:typeAndClass|Smalltalk changed: typeAndClass first with: typeAndClass second].

    notifier priority: Processor userBackgroundPriority - 1.

    lock := RecursionLock new.

    erroneous := nil.

    "Modified: / 21-09-2016 / 10:28:10 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

setVM: aJavaVM

    "Now, aJavaVM == JavaVM (i.e, the class JavaVM

    itself, not its instance)"

    vm := aJavaVM.

    "Created: / 21-12-2010 / 19:44:07 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified (format): / 07-02-2013 / 17:36:19 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaClassRegistry methodsFor:'registering'!

registerClass: newClass

    | classes oldClass |

    ((newClass binaryName == #'$do$It$')

        and:[newClass superclass binaryName == #'groovy/lang/Script']) ifTrue:[

        "/ Mhhh...Groovy do-it. No need to register this!!

        ^ self

    ].

    self assert: (newClass binaryName includes: $.) not.

    loaders keysAndValuesDo:[:loader :classesPerLoader|

        (classesPerLoader includesKey: newClass binaryName) ifTrue:[

            loader == newClass classLoader ifTrue:[

                (oldClass := classesPerLoader at: newClass binaryName) ~~ newClass ifTrue:[

                    "Class already exists, reload & reinstall"

                    | reloadedClass |

                    self registerClassRedefined: oldClass.  

                    "/ ...if old class contained errors, unregister it from list of erroneous 

                    "/ classes...

                    oldClass hasErrors ifTrue:[ 

                        self unregisterErroneous: oldClass.  

                    ]. 

                    reloadedClass := JavaClassReloader reload: oldClass with: newClass.

                    "/OK, full reload, not just method dictionary update"

                    reloadedClass ~~ oldClass ifTrue:[

                        "/ Remove old class from classloader...

                        self unregisterClassInClassLoader: oldClass.  

                        "/ ...from reflection cache....

                        JavaVM reflection removeJavaClassObjectForClass: oldClass.                 

                        "/ ...and finally mark it obsolete...

                        oldClass beObsolete.

                        classesPerLoader

                            at: newClass binaryName

                            put: reloadedClass.

                        self registerClassInClassLoader: reloadedClass.  

                        self registerClassInSmalltalk: reloadedClass notify: false.

                    ].

                    "/ ...if old class contained errors, unregister it from erroneous as now

                    "/ it is obsolete...

                    reloadedClass hasErrors ifTrue:[ 

                        self registerErroneous: reloadedClass.  

                    ].

                    "/ ...likewise, if new class contains errors,

                    Smalltalk changed: #classDefinition with: reloadedClass.

                    ^self.

                ].

            ].

        ].

    ].

    classes := loaders at: newClass classLoader ifAbsent: nil.

    classes isNil ifTrue:[

        classes := loaders at: newClass classLoader put: Dictionary new.

    ].

    classes at: newClass binaryName  put: newClass.

    newClass isJavaClass ifTrue:[

        self registerClassInClassLoader: newClass.

        "/ Register class in system dictionary so it can be browsed

        "/ by system browser...

        self registerClassInSmalltalk: newClass notify: true.

        "/ ...register builtin classes in JavaVMData...

        newClass isBuiltInClass ifTrue:[

            self assert: newClass classLoader isNil. "/must be loaded by primordial CL...

            self registerBuiltIn: newClass.

        ].

        "/ ...and finally, if class contains compilation errors, register it as such...

        newClass hasErrors ifTrue:[ 

            self registerErroneous: newClass.

        ].

    ].

    "/ There may be classes already loaded with compile errors.

    "/ Try to recompile all erroneous classes that depends on this one...

    JavaCompiler notNil ifTrue:[

       JavaCompiler recompileErroneousClassesReferringTo: newClass ignoring: newClass.

    ].

    "Created: / 23-10-2011 / 11:53:58 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 02-11-2011 / 18:40:52 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

    "Modified: / 20-09-2016 / 23:25:42 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

registerClasses: classes

    classes do:[:cls|self registerClass: cls].

    "Created: / 02-01-2013 / 17:01:15 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

registerClasses: classes andWait: doWait

    "Register given set of classes and if

     `doWait` is true, wait until all pending notifications

     are delivered"

    classes do:[:cls|self registerClass: cls].

    doWait ifTrue:[

        notifier waitUntilProcessed.

    ]

    "Created: / 04-08-2013 / 03:55:49 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

unregisterClass: oldClass

    ^ self unregisterClass: oldClass ignoring: Set new.

    "Created: / 04-04-2012 / 02:43:16 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 10-10-2014 / 12:12:45 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

unregisterClass: oldClass ignoring: ignoredClasses

    | classes |

    classes := loaders at: oldClass classLoader ifAbsent: nil.

    classes notNil ifTrue:[

        "/ Check if the class is there, it could be removed meanwhile...

        (classes includesKey: oldClass binaryName) ifTrue:[

            "/ Now, invalidate references and unload all dependent clases

            "/ (JavaClassReloader will unload them by recursively call #unregisterClass:

            JavaClassReloader unload: oldClass ignoring: ignoredClasses.

            "/ Now remove it from class registry...

            classes removeKey: oldClass binaryName.

            "/ ...from class loader...

            self unregisterClassInClassLoader: oldClass.  

            "/ ...from reflection cache....

            JavaVM reflection removeJavaClassObjectForClass: oldClass.

            "/ ...and from Smalltalk dictionary

            self unregisterClassInSmalltalk: oldClass notify: true.

        ]

    ].

    "Created: / 10-10-2014 / 12:12:23 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

unregisterClassLoader: aJavaClassLoader

    | classes |

    classes := loaders at: aJavaClassLoader ifAbsent:[ ^ self ].

    self unregisterClasses: classes values.

    loaders removeKey: aJavaClassLoader.

    "Created: / 16-12-2012 / 16:39:45 / Marcel Hlopko <marcel.hlopko@fit.cvut.cz>"

    "Modified: / 17-10-2013 / 10:37:16 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

unregisterClasses: classes

    classes do:[:cls|self unregisterClass: cls].

    "Created: / 02-01-2013 / 17:01:26 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaClassRegistry methodsFor:'registering-private'!

registerBuiltIn: class

    | nm |

    nm := class binaryName.

    nm = #'java/lang/Object' ifTrue:[

        _java_lang_Object_CLASS := class.

        ^self.

    ].

    nm = #'java/lang/System' ifTrue:[

        _java_lang_System_CLASS := class.

        ^self.