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Re: [Pharo-dev] [Ann] New version of Ghost

by Denis Kudriashov

2016-03-24 20:27 GMT+01:00 stepharo <stepharo(a)free.fr>: > Do you mean that you use subclasses to register selectors that will not be > trapped? > Why is is better than a collection on the object? > I not understand your question. For example you want to make message #asString meta. You can implement it directly in class GHStandartMetaMessages: GHStandartMetaMessages>>asString "here there is instance variable *ghost *which you can use for implementation" ^'string presentation for ghost' Now if you will define your proxy with standart meta level #asString will be not intercepted and instead GHStandartMetaMessages>>asString will be executed with ghost. In previous version you would add #asString to special map: initializeMetaLevel "many many other mappings here and new one" notInterceptedMessages at: #asString put: #handleAsStringFor:

March 24, 2016

Re: [Pharo-dev] [Ann] New version of Ghost

by Denis Kudriashov

2016-03-24 20:27 GMT+01:00 stepharo <stepharo(a)free.fr>: > Pay attention Standard and no Standart So what the right word? Standart exists in my english dictionary

March 24, 2016

Re: [Pharo-dev] [Ann] New version of Ghost

by Denis Kudriashov

2016-03-24 20:18 GMT+01:00 stepharo <stepharo(a)free.fr>: > Does it mean that we cannot proxy classes? For this purpose there is GHClassGhost. I wrote about it in response to Mariano

March 24, 2016

Re: [Pharo-dev] [Ann] New version of Ghost

by Denis Kudriashov

2016-03-24 19:15 GMT+01:00 phil(a)highoctane.be <phil(a)highoctane.be>: > Awesome. Things are looking good. > > Now, just have to find time to use all of this :-) > I just should say that I am not succeed to provide really safe ghosts. If you will try to implement new kind of proxy (on top of Ghost) it is possible to hang image. Problem that when you make some mistake in implementation it usually lead to infinite recursion and interrupt usually not helps because opened debugger produces new messages to ghost which produces another recursion due to original errors. And errors are not only exceptions but some unexpected messages to proxies. For example if you will use Set to implement proxy behaviour (for some reason) it will send #= and #hash to proxy when you will try to add it. There are tools now to minimize such cases. For example standart meta level will not intercept messages from debugger. But as soon as you start experiment with empty meta level you will get such problems. This week Guille Polito start to use Ghost for new proxies and he was not happy due to this kind of problems. Maybe together we will find some solution how to make ghosts safe.

March 24, 2016

Re: [Pharo-dev] [Ann] New version of Ghost

by stepharo

Le 24/3/16 17:48, Denis Kudriashov a Ã©crit : > Hello. > > I finished new version of Ghost: > > * DNU approach for basic proxies instead of #cannotInterpret: trick > (trick used only for class proxies) > * Abstract proxy classes uses Ghost name instead of Proxy: there are > GHObjectGhost and GHClassGhost. > * GHProxyHandler renamed to GHGhostBehaviour. Concrete ghosts should > implement #ghostBehaviour instead of #proxyHandler. > * GHGhostBehaviour should define #currentMetaLevel to specify set of > messages which should not be intercepted. Such meta messages will > be executed under ghost instance by subclass of GHMetaMessages. > > In previous version there was dictionary which maps meta message > selector to implementation selector. It was not suitable. Now meta > messages should be directly implemented on particular > GHMetaMessages subclass and all it methods are considered meta. > > So GhostBehaviour should return instance of GHMetaLevel with meta > messages implementation class: > Do you mean that you use subclasses to register selectors that will not be trapped? Why is is better than a collection on the object? > > o GHMetaLevel with: GHEmptyMetaMessages "when all possible > messages should intercepted" > o GHMetaLevel with: GHStandartMetaMessages "when tools specific > messages should not be intercepted" > > For example standard meta messages implements #inspect: > Pay attention Standard and no Standart > > GHStandartMetaMessages>>inspect > > "Create and schedule an Inspector in which the user can > examine the receiver's variables." > > ^ Smalltalk tools inspector inspect: *ghost* > > > * Traits for methods explicitly defined on ghosts: TMinimalProxy, > TNotNilProxy, TIdentifiedProxy (with #=, #hash, #class). Concrete > proxies can add this traits to itself independently from meta > level. For example traits supply convenient methods to retrieve > ghost information in polymorphic way with objects: > o ghost isGhost > o ghost ghostClass "returns actual class of receiver" > when I read ghostClass I expect getting the class implementing the proxy not the proxied class. So I'm confused. > o ghost ghostPrintString "returns string which represents ghost > from meta level point of view" > > This traits are suitable and they provide some kind of > optimisation for proxies (methods from traits are executed > directly instead of complex meta messages mechanizm). But maybe > they are superfluous. For example they can't be reused for class > proxies which substitute real object classes (to intercept all > instance messages). > > * GHClassGhost able to replace class of real objects. It implements > cannotInterpret: trick to intercept all instance messages. > Subclasses should define two behaviours: #ghostBehaviour (as any > other ghost) and #instancesBehaviour which will process instance > messages. In previous version it was different message to same > #ghostBehaviour. > * New kind of proxies: > o GHObjectVirus. It is special kind of GHClassProxy. It infects > real object to intercept it messages. From meta level infected > object looks like healthy object which means that meta > messages are executed by infected object itself. As class > virus looks like real victim class. So in case when virus is > created with standard meta level tools will not differ him > from health object. There are special messages which allow ask > object about viruses: > + infectedObject isInfectedByVirus > + infectedObject virus > + infectedObject recoverFromVirus > I could not understand what is a Virus. > o GHLearningObject. It is suitable proxy which retrieves all > unknown methods from teacher class. Thank's Stephan for this idea. > > This kind of proxy allows me easily find required set of > messages to support inspectors and debuggers. You can create > instance of learning object by: > > GHLearningObject withTeacher: Object. > > And any operation with it will fill studiedMessages > dictionary. In my case I opened GTInspector on it and got all > messages which was needed for him. > :) > > * Ghosts works correctly with latest Pharo 5 tools (basic inspector, > GTInspector, SpecDebugger, GTDebugger). Required methods for tools > are extracted to 'Ghost-GTSupport' package. > * Repackaging: > o Ghost-ObjectProxies. It contains all core classes and abstract > GHObjectGhost which is based on DNU > o Ghost-ClassProxies. It contains code for proxy which can > substitute class of real object. GHClassGhost implements > cannotInterpret: trick to intercept all instance messages. And > it implement support for debugging such methods. > o Ghost-LearningObject > o Ghost-ObjectVirus > o Ghost-GTSupport > o test packages > * All code moved to Pharo repository > http://smalltalkhub.com/#!/~Pharo/Ghost > <http://smalltalkhub.com/#%21/%7EPharo/Ghost> (in includes > packages from CAR repo too) > > Denis it would be good to have some examples described. > You can load new version by: > > Gofer it > smalltalkhubUser: 'Pharo' project: 'Ghost'; > configurationOf: 'Ghost'; > loadStable > > > I use it now in Seamless and Mocketry. > >

March 24, 2016

Re: [Pharo-dev] [Ann] New version of Ghost

by stepharo

Le 24/3/16 17:48, Denis Kudriashov a Ã©crit : > Hello. > > I finished new version of Ghost: > > * DNU approach for basic proxies instead of #cannotInterpret: trick > (trick used only for class proxies) > Does it mean that we cannot proxy classes? > * Abstract proxy classes uses Ghost name instead of Proxy: there are > GHObjectGhost and GHClassGhost. > * GHProxyHandler renamed to GHGhostBehaviour. Concrete ghosts should > implement #ghostBehaviour instead of #proxyHandler. > * GHGhostBehaviour should define #currentMetaLevel to specify set of > messages which should not be intercepted. Such meta messages will > be executed under ghost instance by subclass of GHMetaMessages. > > In previous version there was dictionary which maps meta message > selector to implementation selector. It was not suitable. Now meta > messages should be directly implemented on particular > GHMetaMessages subclass and all it methods are considered meta. > > So GhostBehaviour should return instance of GHMetaLevel with meta > messages implementation class: > > o GHMetaLevel with: GHEmptyMetaMessages "when all possible > messages should intercepted" > o GHMetaLevel with: GHStandartMetaMessages "when tools specific > messages should not be intercepted" > > For example standard meta messages implements #inspect: > > GHStandartMetaMessages>>inspect > > "Create and schedule an Inspector in which the user can > examine the receiver's variables." > > ^ Smalltalk tools inspector inspect: *ghost* > > > * Traits for methods explicitly defined on ghosts: TMinimalProxy, > TNotNilProxy, TIdentifiedProxy (with #=, #hash, #class). Concrete > proxies can add this traits to itself independently from meta > level. For example traits supply convenient methods to retrieve > ghost information in polymorphic way with objects: > o ghost isGhost > o ghost ghostClass "returns actual class of receiver" > o ghost ghostPrintString "returns string which represents ghost > from meta level point of view" > > This traits are suitable and they provide some kind of > optimisation for proxies (methods from traits are executed > directly instead of complex meta messages mechanizm). But maybe > they are superfluous. For example they can't be reused for class > proxies which substitute real object classes (to intercept all > instance messages). > > * GHClassGhost able to replace class of real objects. It implements > cannotInterpret: trick to intercept all instance messages. > Subclasses should define two behaviours: #ghostBehaviour (as any > other ghost) and #instancesBehaviour which will process instance > messages. In previous version it was different message to same > #ghostBehaviour. > * New kind of proxies: > o GHObjectVirus. It is special kind of GHClassProxy. It infects > real object to intercept it messages. From meta level infected > object looks like healthy object which means that meta > messages are executed by infected object itself. As class > virus looks like real victim class. So in case when virus is > created with standard meta level tools will not differ him > from health object. There are special messages which allow ask > object about viruses: > + infectedObject isInfectedByVirus > + infectedObject virus > + infectedObject recoverFromVirus > > o GHLearningObject. It is suitable proxy which retrieves all > unknown methods from teacher class. Thank's Stephan for this idea. > > This kind of proxy allows me easily find required set of > messages to support inspectors and debuggers. You can create > instance of learning object by: > > GHLearningObject withTeacher: Object. > > And any operation with it will fill studiedMessages > dictionary. In my case I opened GTInspector on it and got all > messages which was needed for him. > > * Ghosts works correctly with latest Pharo 5 tools (basic inspector, > GTInspector, SpecDebugger, GTDebugger). Required methods for tools > are extracted to 'Ghost-GTSupport' package. > * Repackaging: > o Ghost-ObjectProxies. It contains all core classes and abstract > GHObjectGhost which is based on DNU > o Ghost-ClassProxies. It contains code for proxy which can > substitute class of real object. GHClassGhost implements > cannotInterpret: trick to intercept all instance messages. And > it implement support for debugging such methods. > o Ghost-LearningObject > o Ghost-ObjectVirus > o Ghost-GTSupport > o test packages > * All code moved to Pharo repository > http://smalltalkhub.com/#!/~Pharo/Ghost > <http://smalltalkhub.com/#%21/%7EPharo/Ghost> (in includes > packages from CAR repo too) > > > You can load new version by: > > Gofer it > smalltalkhubUser: 'Pharo' project: 'Ghost'; > configurationOf: 'Ghost'; > loadStable > > > I use it now in Seamless and Mocketry. > >

March 24, 2016

Re: [Pharo-dev] [Ann] New version of Ghost

by Denis Kudriashov

Hi. Thank's for kind words. 2016-03-24 19:22 GMT+01:00 Mariano Martinez Peck <marianopeck(a)gmail.com>: > >> - GHClassGhost able to replace class of real objects. It implements >> cannotInterpret: trick to intercept all instance messages. Subclasses >> should define two behaviours: #ghostBehaviour (as any other ghost) and >> #instancesBehaviour which will process instance messages. In previous >> version it was different message to same #ghostBehaviour. >> >> In your original version you implemented #cannotInterpert: for instance messages such way: proxy proxyHandler *handleInterceptionToInstance:* interception. And proxy handler was responsible for two messages: #handleInterceptionToInstance: and #handleInterception:. In my version I ask proxy for different kind of handler (ghostBehaviour): GHObjectGhost>>doesNotUnderstand: aMessage self *ghostBehaviour* intercept: aMessage to: self GHInstanceMessagesInterceptor>>cannotInterpret: aMessage "some logic to find ghostClass" ghostClass *instancesBehaviour* intercept: aMessage to: self > >> - New kind of proxies: >> - GHObjectVirus. It is special kind of GHClassProxy. It infects real >> object to intercept it messages. From meta level infected object looks like >> healthy object which means that meta messages are executed by infected >> object itself. As class virus looks like real victim class. So in case when >> virus is created with standard meta level tools will not differ him from >> health object. There are special messages which allow ask object about >> viruses: >> - infectedObject isInfectedByVirus >> - infectedObject virus >> - infectedObject recoverFromVirus >> >> > Sorry I did not get this one. > Good example where I use viruses is stubbing real objects in Mocketry. I will announce it soon. You can do this: rect := 0@0 corner: 2@3 rect stub area willReturn: 1000. rect area "=> 1000". rect origin "=> 0@0". >From any tool you will see normal rectangle. Nothing special. But in reality it is infected by virus which delegate all messages to "Mocketry machinery". And you can detect it by: rect isInfectedByVirus "=> true" And you can heal infected object: rect recoverFromVirus. "or virus heal: infectedObject" rect isInfectedByVirus "=> false"

March 24, 2016

Re: [Pharo-dev] [Ann] New version of Ghost

by Mariano Martinez Peck

On Thu, Mar 24, 2016 at 1:48 PM, Denis Kudriashov <dionisiydk(a)gmail.com> wrote: > Hello. > > I finished new version of Ghost: > That's very nice to hear!! I love to see someone took it and improve it :) > > - DNU approach for basic proxies instead of #cannotInterpret: trick > (trick used only for class proxies) > > Excellent. Yes, I remember the discussion we had weeks ago. > > - > - Abstract proxy classes uses Ghost name instead of Proxy: there are > GHObjectGhost and GHClassGhost. > - GHProxyHandler renamed to GHGhostBehaviour. Concrete ghosts should > implement #ghostBehaviour instead of #proxyHandler. > - GHGhostBehaviour should define #currentMetaLevel to specify set of > messages which should not be intercepted. Such meta messages will be > executed under ghost instance by subclass of GHMetaMessages. > > In previous version there was dictionary which maps meta message selector > to implementation selector. It was not suitable. Now meta messages should > be directly implemented on particular GHMetaMessages subclass and all it > methods are considered meta. > > So GhostBehaviour should return instance of GHMetaLevel with meta messages > implementation class: > > > - GHMetaLevel with: GHEmptyMetaMessages "when all possible messages > should intercepted" > - GHMetaLevel with: GHStandartMetaMessages "when tools specific > messages should not be intercepted" > > For example standard meta messages implements #inspect: > > GHStandartMetaMessages>>inspect > > "Create and schedule an Inspector in which the user can examine the > receiver's variables." > > ^ Smalltalk tools inspector inspect: *ghost* > > > Nice. Yes, this is much better than my original dictionary-based solution > > - Traits for methods explicitly defined on ghosts: TMinimalProxy, > TNotNilProxy, TIdentifiedProxy (with #=, #hash, #class). Concrete proxies > can add this traits to itself independently from meta level. For example > traits supply convenient methods to retrieve ghost information in > polymorphic way with objects: > - ghost isGhost > - ghost ghostClass "returns actual class of receiver" > - ghost ghostPrintString "returns string which represents ghost > from meta level point of view" > > This traits are suitable and they provide some kind of optimisation for > proxies (methods from traits are executed directly instead of complex meta > messages mechanizm). But maybe they are superfluous. For example they can't > be reused for class proxies which substitute real object classes (to > intercept all instance messages). > > Good idea as well. Just as yet another useful example of this, I recommend watching the proxies I defined for Marea as you will have interesting proxies for classes and metaclasses. Basically, I defined quite some methods in those proxies so that to avoid intercepting and faulting my objects. See Marea code and watch for it's proxies! Let me know if you found the methods I am talking about. > > - GHClassGhost able to replace class of real objects. It implements > cannotInterpret: trick to intercept all instance messages. Subclasses > should define two behaviours: #ghostBehaviour (as any other ghost) and > #instancesBehaviour which will process instance messages. In previous > version it was different message to same #ghostBehaviour. > - New kind of proxies: > - GHObjectVirus. It is special kind of GHClassProxy. It infects real > object to intercept it messages. From meta level infected object looks like > healthy object which means that meta messages are executed by infected > object itself. As class virus looks like real victim class. So in case when > virus is created with standard meta level tools will not differ him from > health object. There are special messages which allow ask object about > viruses: > - infectedObject isInfectedByVirus > - infectedObject virus > - infectedObject recoverFromVirus > > Sorry I did not get this one. > > - GHLearningObject. It is suitable proxy which retrieves all unknown > methods from teacher class. Thank's Stephan for this idea. > > This kind of proxy allows me easily find required set of messages to > support inspectors and debuggers. You can create instance of learning > object by: > > GHLearningObject withTeacher: Object. > > And any operation with it will fill studiedMessages dictionary. In my case > I opened GTInspector on it and got all messages which was needed for him. > > Great idea too. I had to come with the set of mapped selectors (the dictionary) by poor man human try and error hahaha. > > - Ghosts works correctly with latest Pharo 5 tools (basic inspector, > GTInspector, SpecDebugger, GTDebugger). Required methods for tools are > extracted to 'Ghost-GTSupport' package. > - Repackaging: > - Ghost-ObjectProxies. It contains all core classes and abstract > GHObjectGhost which is based on DNU > - Ghost-ClassProxies. It contains code for proxy which can > substitute class of real object. GHClassGhost implements cannotInterpret: > trick to intercept all instance messages. And it implement support for > debugging such methods. > - Ghost-LearningObject > - Ghost-ObjectVirus > - Ghost-GTSupport > - test packages > - All code moved to Pharo repository > http://smalltalkhub.com/#!/~Pharo/Ghost (in includes packages from CAR > repo too) > > > Excellent. Thanks Denis for pushing Ghost further! -- Mariano http://marianopeck.wordpress.com

March 24, 2016

Re: [Pharo-dev] [Ann] New version of Ghost

by phil＠highoctane.be

Awesome. Things are looking good. Now, just have to find time to use all of this :-) Phil On Thu, Mar 24, 2016 at 5:48 PM, Denis Kudriashov <dionisiydk(a)gmail.com> wrote: > Hello. > > I finished new version of Ghost: > > - DNU approach for basic proxies instead of #cannotInterpret: trick > (trick used only for class proxies) > - Abstract proxy classes uses Ghost name instead of Proxy: there are > GHObjectGhost and GHClassGhost. > - GHProxyHandler renamed to GHGhostBehaviour. Concrete ghosts should > implement #ghostBehaviour instead of #proxyHandler. > - GHGhostBehaviour should define #currentMetaLevel to specify set of > messages which should not be intercepted. Such meta messages will be > executed under ghost instance by subclass of GHMetaMessages. > > In previous version there was dictionary which maps meta message selector > to implementation selector. It was not suitable. Now meta messages should > be directly implemented on particular GHMetaMessages subclass and all it > methods are considered meta. > > So GhostBehaviour should return instance of GHMetaLevel with meta messages > implementation class: > > > - GHMetaLevel with: GHEmptyMetaMessages "when all possible messages > should intercepted" > - GHMetaLevel with: GHStandartMetaMessages "when tools specific > messages should not be intercepted" > > For example standard meta messages implements #inspect: > > GHStandartMetaMessages>>inspect > > "Create and schedule an Inspector in which the user can examine the > receiver's variables." > > ^ Smalltalk tools inspector inspect: *ghost* > > > > - Traits for methods explicitly defined on ghosts: TMinimalProxy, > TNotNilProxy, TIdentifiedProxy (with #=, #hash, #class). Concrete proxies > can add this traits to itself independently from meta level. For example > traits supply convenient methods to retrieve ghost information in > polymorphic way with objects: > - ghost isGhost > - ghost ghostClass "returns actual class of receiver" > - ghost ghostPrintString "returns string which represents ghost > from meta level point of view" > > This traits are suitable and they provide some kind of optimisation for > proxies (methods from traits are executed directly instead of complex meta > messages mechanizm). But maybe they are superfluous. For example they can't > be reused for class proxies which substitute real object classes (to > intercept all instance messages). > > > - GHClassGhost able to replace class of real objects. It implements > cannotInterpret: trick to intercept all instance messages. Subclasses > should define two behaviours: #ghostBehaviour (as any other ghost) and > #instancesBehaviour which will process instance messages. In previous > version it was different message to same #ghostBehaviour. > - New kind of proxies: > - GHObjectVirus. It is special kind of GHClassProxy. It infects real > object to intercept it messages. From meta level infected object looks like > healthy object which means that meta messages are executed by infected > object itself. As class virus looks like real victim class. So in case when > virus is created with standard meta level tools will not differ him from > health object. There are special messages which allow ask object about > viruses: > - infectedObject isInfectedByVirus > - infectedObject virus > - infectedObject recoverFromVirus > > > - GHLearningObject. It is suitable proxy which retrieves all unknown > methods from teacher class. Thank's Stephan for this idea. > > This kind of proxy allows me easily find required set of messages to > support inspectors and debuggers. You can create instance of learning > object by: > > GHLearningObject withTeacher: Object. > > And any operation with it will fill studiedMessages dictionary. In my case > I opened GTInspector on it and got all messages which was needed for him. > > > - Ghosts works correctly with latest Pharo 5 tools (basic inspector, > GTInspector, SpecDebugger, GTDebugger). Required methods for tools are > extracted to 'Ghost-GTSupport' package. > - Repackaging: > - Ghost-ObjectProxies. It contains all core classes and abstract > GHObjectGhost which is based on DNU > - Ghost-ClassProxies. It contains code for proxy which can > substitute class of real object. GHClassGhost implements cannotInterpret: > trick to intercept all instance messages. And it implement support for > debugging such methods. > - Ghost-LearningObject > - Ghost-ObjectVirus > - Ghost-GTSupport > - test packages > - All code moved to Pharo repository > http://smalltalkhub.com/#!/~Pharo/Ghost (in includes packages from CAR > repo too) > > > You can load new version by: > > Gofer it > smalltalkhubUser: 'Pharo' project: 'Ghost'; > configurationOf: 'Ghost'; > loadStable > > > I use it now in Seamless and Mocketry. > > >

March 24, 2016

[Ann] New version of Ghost

by Denis Kudriashov

Hello. I finished new version of Ghost: - DNU approach for basic proxies instead of #cannotInterpret: trick (trick used only for class proxies) - Abstract proxy classes uses Ghost name instead of Proxy: there are GHObjectGhost and GHClassGhost. - GHProxyHandler renamed to GHGhostBehaviour. Concrete ghosts should implement #ghostBehaviour instead of #proxyHandler. - GHGhostBehaviour should define #currentMetaLevel to specify set of messages which should not be intercepted. Such meta messages will be executed under ghost instance by subclass of GHMetaMessages. In previous version there was dictionary which maps meta message selector to implementation selector. It was not suitable. Now meta messages should be directly implemented on particular GHMetaMessages subclass and all it methods are considered meta. So GhostBehaviour should return instance of GHMetaLevel with meta messages implementation class: - GHMetaLevel with: GHEmptyMetaMessages "when all possible messages should intercepted" - GHMetaLevel with: GHStandartMetaMessages "when tools specific messages should not be intercepted" For example standard meta messages implements #inspect: GHStandartMetaMessages>>inspect "Create and schedule an Inspector in which the user can examine the receiver's variables." ^ Smalltalk tools inspector inspect: *ghost* - Traits for methods explicitly defined on ghosts: TMinimalProxy, TNotNilProxy, TIdentifiedProxy (with #=, #hash, #class). Concrete proxies can add this traits to itself independently from meta level. For example traits supply convenient methods to retrieve ghost information in polymorphic way with objects: - ghost isGhost - ghost ghostClass "returns actual class of receiver" - ghost ghostPrintString "returns string which represents ghost from meta level point of view" This traits are suitable and they provide some kind of optimisation for proxies (methods from traits are executed directly instead of complex meta messages mechanizm). But maybe they are superfluous. For example they can't be reused for class proxies which substitute real object classes (to intercept all instance messages). - GHClassGhost able to replace class of real objects. It implements cannotInterpret: trick to intercept all instance messages. Subclasses should define two behaviours: #ghostBehaviour (as any other ghost) and #instancesBehaviour which will process instance messages. In previous version it was different message to same #ghostBehaviour. - New kind of proxies: - GHObjectVirus. It is special kind of GHClassProxy. It infects real object to intercept it messages. From meta level infected object looks like healthy object which means that meta messages are executed by infected object itself. As class virus looks like real victim class. So in case when virus is created with standard meta level tools will not differ him from health object. There are special messages which allow ask object about viruses: - infectedObject isInfectedByVirus - infectedObject virus - infectedObject recoverFromVirus - GHLearningObject. It is suitable proxy which retrieves all unknown methods from teacher class. Thank's Stephan for this idea. This kind of proxy allows me easily find required set of messages to support inspectors and debuggers. You can create instance of learning object by: GHLearningObject withTeacher: Object. And any operation with it will fill studiedMessages dictionary. In my case I opened GTInspector on it and got all messages which was needed for him. - Ghosts works correctly with latest Pharo 5 tools (basic inspector, GTInspector, SpecDebugger, GTDebugger). Required methods for tools are extracted to 'Ghost-GTSupport' package. - Repackaging: - Ghost-ObjectProxies. It contains all core classes and abstract GHObjectGhost which is based on DNU - Ghost-ClassProxies. It contains code for proxy which can substitute class of real object. GHClassGhost implements cannotInterpret: trick to intercept all instance messages. And it implement support for debugging such methods. - Ghost-LearningObject - Ghost-ObjectVirus - Ghost-GTSupport - test packages - All code moved to Pharo repository http://smalltalkhub.com/#!/~Pharo/Ghost (in includes packages from CAR repo too) You can load new version by: Gofer it smalltalkhubUser: 'Pharo' project: 'Ghost'; configurationOf: 'Ghost'; loadStable I use it now in Seamless and Mocketry.

March 24, 2016