Spoon

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remote messaging loves #doesNotUnderstand:
by Chris Cunnington 13 Sep '11

13 Sep '11

At Deep Into Smalltalk at Lille in March Noury Bouraqadi presented a simple example of remote messaging. (The exampes are here http://car.mines-douai.fr/noury/docs ). You have two images. One is a proxy; the other is the server. You send a message to the proxy and it appears on the Transcript of the server. proxy := Proxy newOnPort: 5432. proxy cr; show: 'This is my boomstick!'. So you send a message to Proxy, which understands absolutely nothing. Zilch. It defaults to #doesNotUnderstand:, which captures the message as an instance of Message. doesNotUnderstand: *aMessage* "Message answer is not handled!" | messageBytes | *aMessage* lookupClass: nil. messageBytes := ReferenceStream streamedRepresentationOf: *aMessage*. socketStream := SocketStream openConnectionToHostNamed: 'localhost' port: portNumber. socketStream isConnected ifFalse: [^nil]. [socketStream sendCommand: messageBytes] ensure: [socketStream close]. You can see here that it is serialized by ReferenceStream, shot over the wire by SocketStream. It is de-serialized here in the server image: dispatch: messageBytes | message | *message* := ReferenceStream unStream: messageBytes. *message* sendTo: Transcript The important part is the last line, which has the Message instance sent #sendTo: and so for all intents and purposed you have send this old standby: Transcript show: 'This is my boomstick!' except the Transcript is not yours; it's somebody else's. Now let's look at Croquet/Qwaq FarRef>>#doesNotUnderstand: which has a class comment that says: "I represent a reference to an object living on another island. When I receive a message I pass the message on to the object." The class FarRef looks to me to be the same as Noury's Proxy: it understands no selectors; it uses a #doesNotUnderstand: override to capture the message; and, sends the message over the wire. The implementation of #doesNotUnderstand: is not clear to me, so I'll stick to the class comment as my proof. Does Qwaq use ReferenceStream to serialize? I don't know. In Spoon we have Other>>#doesNotUnderstand: which has this class comment: "Each of my instances respresents an object in another memory, reachable through a NetStream. Messages sent to one of my instances are forwarded to the remote object, and another Other is answered." It has #doesNotUnderstand: with a simple #forward: selector doesNotUnderstand: aMessage ^self forward: aMessage and then: forward: aMessage "Forward aMessage to the remote object I represent, and answer the result." "This message was invoked by the virtual machine, in response to an attempt to send aMessage to me." "Transcript cr; print: aMessage; endEntry." ^( ReflectiveBehavior at: aMessage selector ifAbsent: [ ^OutgoingMessageExchange forward: aMessage for: remoteIdentity over: session] ) value: session value: aMessage arguments I think Craig may be familiar with the idea of a remote Transcript as he's included a class comment there that looks like Noury's simple program. The message gets passed to OutgoingMessageExchange. Does it use ReferenceStream to serialize? I don't know yet. To conclude, each of these different programs creates a proxy that understands no selectors, but uses #doesNotUnderstand to glean the message. Thus captured it sends it to a remote receiver. This is the beachhead I've needed to understand Spoon. I'll extend outward from this observation. Chris

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Oops, my bad
by Chris Cunnington 09 Sep '11

09 Sep '11

Some of the problems I've been having have come from not including this code written in the startup Workspace for the Wormhole server: (self minimumSubjectPeer classWithBaseID: EditHistory baseID) connect For reasons unknown I haven't added this when I started the Wormhole server to connect to the subject.image and history.image. I think this has meant the history image has been unreachable. Having started to do that Spoon works much better. RTFM, I guess. Anyway, if I could figure out how to remove the bug I put at bugs.squeak.org, I would. I can now see the code for methods in the code pane of the Other Browser. It wonks out sometimes with an error, but it's a huge leap forward in my hacking. Chris

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Then again...
by Chris Cunnington 07 Sep '11

07 Sep '11

I think what I said yesterday is impossible. I think TCP can open a channel, but can't itself pass data. To even make a request requires the HTTP protocol. TCP stream := SocketStream openConnectionToHostNamed: 'www.squeak.org' port:80 HTTP stream nextPutAll: 'GET /HTTP'; crlf;crlf; flush. Those lines are taken from the SocketStream class comment and I think they illustrate the relationship between TCP and HTTP. You need HTTP to make a request. Soooo... If I open Spoon and follow its instructions. And then in the Other Browser I get an error when I click on a method in the remote/subject image that says this: MessageNotUnderstood: ByteString>>activeClass then I'm going to say that there is a problem between the large and small images in sending each other data. If it is not possible for the TCP protocol to send data on its own and the current alpha has no HTTP protocol classes, then doesn't it follow that the current alpha release expects resources that aren't there? And doesn't the master version of Spoon have an HTTPServer and related HTTP protocol classes? Is that why we get an a ByteString>>activeClass error? It's a thought, Chris

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Simulating the VM
by Sean P. DeNigris 28 Aug '11

28 Aug '11

I tried to simulate the VM by executing: InterpreterSimulator simulate: 'path/to/subject.image'. The spoon image hung after the transcript showed: <Running full GC ... done> Looking for module Flow ... loaded............. Looking for module MiscPrimitivePlugin ... loaded What should I do differently? Thanks. Sean -- View this message in context: http://forum.world.st/Simulating-the-VM-tp3774139p3774139.html Sent from the Squeak - Spoon mailing list archive at Nabble.com.

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Re: first Naiad module page created
by Yanni Chiu 11 Jul '11

11 Jul '11

On 11/07/11 1:54 PM, Craig Latta wrote: > > http://wp.me/psJuY-2w (wordpress.com) <nitpick> IMHO, an email message should have the full link, not a shortened link. Am I the only one who worries about the lost linkages which will occur, when some of these URL-shortening sites go "off-air". </nitpick> Interesting. Glad to see Spoon progressing. I tried the links on the page - all but one ended up at the google home page. I'm not sure what was supposed to happen. The "installation link" goes to "localhost:8090".

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Re: [squeak-dev] Re: initial Spoon modularization
by Chris Muller 21 Jun '11

21 Jun '11

Really fascinating Craig, congratulations! > Seriously, the main point in being small is making it easier to > understand the whole system. I want to enable anyone who's interested to > learn how everything fits together, and not wonder why something is there. Not only that, but is this also a practical way to make a small, special-purpose image? For example, what would it take to imprint onto your 300K image from, say, a standard Squeak 4.2 image, just the methods needed to run one method specified by the user, which would cause all kinds of other methods to be faulted into the target image, but still end up with considerably less than the entirety of the 4.2 image? - Chris

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Re: initial Spoon modularization
by Craig Latta 21 Jun '11

21 Jun '11

Hi Ron-- Thanks! Yeah, this is a system that can serve a website for doing module discovery and management, appear as a filesystem through WebDAV, keep track of changes, and serve modules to other systems. Currently it's 300k, but there's another shrinking pass left. -C -- Craig Latta www.netjam.org/resume +31 6 2757 7177 + 1 415 287 3547

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"Can I use my favorite text editor?"
by Craig Latta 31 May '11

31 May '11

http://tinyurl.com/3dup5p9 (wordpress.com) -- Craig Latta www.netjam.org/resume +31 06 2757 7177 + 1 415 287 3547

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MacOS Spoon application created
by Craig Latta 28 Jan '11

28 Jan '11

http://tinyurl.com/663sesr (wordpress.com) -C -- Craig Latta www.netjam.org/resume + 31 020 894 6247 + 1 415 287 3547

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Spoon and Naiad news
by Craig Latta 26 Jan '11

26 Jan '11

Hi-- Spoon 3 is nearing release (scheduled for the moment of equinox on 20 March), featuring the first usable version of Naiad, Spoon's change management system. Please check out my blog "This Context"[1] for news, the Spoon IRC channel[2] and mailing list[3] for discussion, and the Spoon website[4] for artifacts. Thanks! -C [1] http://thiscontext.wordpress.com/ [2] irc://irc.freenode.net/#spoon [3] http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/spoon [4] http://netjam.org/spoon -- Craig Latta www.netjam.org/resume + 31 020 894 6247 + 1 415 287 3547

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