Re: Create a new object.

> Hi
>
> I'm very sorry to bother you again. But I really don't get a clue.
> When we look at the example of the simpleDemoWorld.
> There we have the following.
>
> SimpleWorld>>#initialize
> Space := TSpace new.
> Space registerGlobal:#masterSpace
>
> This is the place where we make the space global for external use.
>
> If we then look at CroquetHarness>>#setupMaster
>
> Island := self createIsland: SimpleWorld named:'Master".
> Space := island future at:#masterSpace
>
> Now the space is connected from the CroquetHarness connected to the  
> Space of
> the SimpleDemoWorld. And we can access that space in the  
> CroquetHarness for
> adding object?
> When I look deeper into the code, I see lots of other code. And I  
> see that
> they also call the following.
>
> CroquetMaster>>#setup
> harness := CroquetHarness new. (This will call the init method I
> suppose)
> harness setupMaster.
> harness addOverlay: self.
>
> Do I have to do that also ? or am I digging to deep? I though  
> creating a
> NavigatorWorld and NavigatorMaster was enough...
>
> Kind regards
>   Rob Van Pamel
>
> -----Oorspronkelijk bericht-----
> Van: Joshua Gargus [mailto:[hidden email]]
> Verzonden: maandag 4 december 2006 21:09
> Aan: Rob Van Pamel
> Onderwerp: Re: [croquet] Create a new object.
>
> You don't see your avatar in the space, either?  Are you creating
> multiple spaces in NavigatorWorld?  Maybe your avatar isn't in the
> same space as the cube is being added to.
>
> One nice thing about Squeak is that you can send messages manually to
> objects that you have a reference to.  For example, in the bottom
> pane of the inspector on the TFarRef:
>
> self future addChild: (myIsland future new: TCube)
>
> Does the cube show up in the space?  If not, then something is very
> very wrong.
>
> Josh
>
>
> On Dec 4, 2006, at 12:04 PM, Rob Van Pamel wrote:
>
>> Hi
>>
>> No i don't see it there... So it isn't a good reference I guess.
>> Perhaps
>> there is something else wrong with my TFarRef.
>> Do you have any idea's?
>>
>> Rob
>>
>>
>>
>> -----Oorspronkelijk bericht-----
>> Van: Joshua Gargus [mailto:[hidden email]]
>> Verzonden: maandag 4 december 2006 20:12
>> Aan: Rob Van Pamel
>> Onderwerp: Re: [croquet] Create a new object.
>>
>> Hi Rob,
>>
>> That's interesting.  I wonder if you're in the space that you think
>> you are?
>>
>> If you explore 'aTSpace' (do you know about the ObjectExplorer?
>> Google it if not; it's useful for investigating hierarchical
>> structures).  Do you see the green cube there?  Do you see your
>> avatar there?
>>
>> Josh
>>
>>
>> On Dec 4, 2006, at 10:42 AM, Rob Van Pamel wrote:
>>
>>> Hi Joshua
>>>
>>> I've done the things like you said it but it didn't worked out.
>>> I think my TfarRef works because when I inspect it , it give's me  
>>> the
>>> following
>>>
>>> myIsland: a TIsland(DMU Navigator World (laptop.telenet.be))
>>> myValue: a TSpace
>>> myName: OID:[eee2b6765add779a2cb0fc14bedfac7a]
>>>
>>> But when I add a cube to it, it doesn't appear in my space. I have
>>> done
>>> it with the following code
>>>
>>> fooCubeRef := island future new: Greencube.
>>> spaceRef future addChild: fooCubeRef.
>>>
>>> Is there something else that I have to do first? Perhaps something
>>> in my
>>> Navigatorworld?
>>>
>>> Thanks a lot
>>>
>>> Here is the code that I have runned. I haven't putted in into a
>>> different
>>> process because I wanted to do it first very basic.
>>>
>>> NavigatorMaster>>setup
>>> | pc sync entry island postcard myName spaceRef fooCubeRef |
>>> running := false.
>>> self startStepping.
>>> harness := CroquetHarnessWithMenu new.
>>> harness addOverlay: self.
>>> myName := 'DMU Navigator World (',NetNameResolver  
>>> localHostName,')'.
>>> island := harness createIsland: NavigatorWorld named: myName.
>>> entry := self registerPortal: #mainEntry in: island.
>>>
>>> island := harness createIsland: NavigatorWorld named: myName.
>>> spaceRef := island "a TFarRef to the island" future at: #mainEntry.
>>> spaceRef wait.  "wait for the future message to resolve"
>>>
>>> fooCubeRef := island future new: Greencube.
>>>       spaceRef future addChild: fooCubeRef.
>>> spaceRef inspect.
>>>
>>>
>>>       harness makeSnapshot: (island future at: #mainEntry) angle: 0
>>> translation:(Vector3 x: 0 y: 0 z: 0).
>>> postcard := TPostcard new routerAddress: nil "don't know what it  
>>> is"
>>> id: nil "don't know what it is"
>>> name: myName
>>> viewpointName: #mainEntry.
>>> harness viewPortal future postcardLink: postcard.
>>> harness findViewpointByPostcard: postcard.
>>>
>>> "Drop into the intro world"
>>> pc := entry future postcard.
>>> pc whenResolved:[
>>> sync := harness  viewPortal future postcardLink: pc value.
>>> sync whenResolved:[harness startRender]. "ready to render"
>>> ].
>>> pc wait.
>>>
>>>
>>>
>>> -----Oorspronkelijk bericht-----
>>> Van: Joshua Gargus [mailto:[hidden email]]
>>> Verzonden: maandag 27 november 2006 19:42
>>> Aan: Rob Van Pamel
>>> CC: [hidden email]
>>> Onderwerp: Re: [croquet] Create a new object.
>>>
>>> Rob, I forwarded one of your previous emails to the list to provide
>>> context for others who might wish to learn from this discussion.  I
>>> hope that you don't mind.
>>>
>>> On Nov 27, 2006, at 6:03 AM, Rob Van Pamel wrote:
>>>
>>>> Hi josh,
>>>>
>>>> I'm sorry but I don't understand it completely.
>>>> I understand that I have to work with a TfarReference because my
>>>> Island is
>>>> isolated from my stepper.
>>>
>>> That's correct.
>>>
>>>> To access my island I created an instance variable not an a global
>>>> one. But
>>>> it is available al over the class that's why I called it an global
>>>> variable.
>>>
>>> OK.  The reason I called it a global variable is that you registered
>>> it as an Island global variable with #registerGlobal:
>>>
>>>>
>>>> So now I have to create an global variable with registerglobal in
>>>> the
>>>> NavigatorMaster and then I can access this variable trough future
>>>> sends?
>>>>
>>>
>>> No, you should be able to create the global variable just fine in
>>> NavigationWorld, just like you are.  What you should not do is stash
>>> a direct reference to the space and then reference it from your
>>> stepper. After the island is finished creating, you can access the
>>> 'island global' as I described, which gives you a TFarRef to the
>>> space.
>>>
>>> spaceRef := island "a TFarRef to the island" future at: #mainEntry.
>>>
>>> islandRef := spaceRef island
>>>
>>>> Do you perhaps have a example in which you work with these future
>>>> sends?
>>>> Because I'm trying to find out but I don't think I'm going to make
>>>> it.
>>>
>>> There are (at least) two approaches you might take.  The following
>>> code assumes that you have already executed the line (in
>>> NavigationMaster)
>>> island := harness createIsland: NavigatorWorld named: myName.
>>> and that you have obtained a reference to the space:
>>> spaceRef := island "a TFarRef to the island" future at: #mainEntry.
>>> spaceRef wait.  "wait for the future message to resolve"
>>>
>>> (I won't get into details, but it would have been fine to send other
>>> future messages to spaceRef without first calling #wait)
>>>
>>> Now assume that you have looked in your database and decided that  
>>> you
>>> need to create a new Foocube in the space.  The first approach is to
>>> gradually construct the object via a series of future messages:
>>>
>>> fooCubeRef := island future new: Foocube.
>>> fooCubeRef future setParameterOne: dataFromDatabase.
>>> fooCubeRef future setParameterTwo: moreDataFromDatabase.
>>> "etc."
>>> spaceRef future addChild: fooCubeRef
>>>
>>> A second approach is to completely create the Foocube outside the
>>> island, then serialize it, then instantiate a copy in the space by
>>> deserializing it.  (a varation on this approach might be very good
>>> for you:  you could skip the Foocube creation step and directly  
>>> store
>>> the serialized data in the database.
>>>
>>> fooCube := Foocube new.
>>> fooCube setParameterOne: dataFromDatabase.
>>> fooCube setParameterTwo: moreDataFromDatabase.
>>> serialized := TIslandCopier new export: fooCube.
>>> fooCubeRef := TIslandCopier new import: serialized to island.
>>> spaceRef future addChild: fooCubeRef
>>>
>>> Let me know how it goes.  If you have problems, it might be  
>>> because I
>>> made a mistake somewhere (I didn't run the code).
>>>
>>> Josh
>>>
>>>
>>>
>>>>
>>>> Thanks in advantage
>>>>   Rob Van Pamel
>>>>
>>>>
>>>
>>> <myCroquet2.st>
>>
>>
>
>