Using Vine in 3-way interactions (was Re: Question on redirectors/whenMoreResolved in the 3-way case, in the middle vat)
Rob Withers <[email protected]> Sun, 01 Mar 2015 04:24:52 -0700
| Newsgroups | gmane.comp.lang.e.general |
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| Message-ID | <[email protected]> |
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Mark, your instincts were right on, it seems.=A0 I have an issue with
my use of the Vine and on reflection it makes perfect sense. I am
bending the send from Carol to Alice over to Bob, so as it is a
3-way interaction, I need a Vine.=A0 In analyzing ELib code, you have
9 references to the Vine's constructor, while I only have 7 (minus
an extra unused constructor I have).=A0 It is going to require some
digging to unearth what I am missing, but the direction is clear.=A0
The place it blows up is in my ProxyResolver.resolve() method, as
the WeakReference has lost the ref.=A0 However, this is not where the
reference is maintained.=A0 I suspect it may be a lack of an
IdentityManager.<br>
<br>
I republished my code to: <a class=3D"moz-txt-link-freetext" href=3D"=
https://github.com/tooantuh/pauwau">https://github.com/tooantuh/pauwau</a=
>.=A0 The
tests pass, though there is an issue with the RefTests and
TestPauwau2VatException, as well as this issue affecting
TestPauwau3VatFollowOnSend.=A0 Additionally, the presentation tests
need to be run one at a time as stopping and starting the
Introducers can step on each other.<br>
<br>
thank you,<br>
Robert<br>
<br>
<div class=3D"moz-cite-prefix">On 2/22/2015 8:02 PM, Mark S. Miller
wrote:<br>
</div>
<blockquote
cite=3D"mid:CABHxS9hp0ay46GV3A7xy2dw1uj+FYzxeTVz=3Dun5UO=3DKEZsfPvA@mail.=
gmail.com"
type=3D"cite">
<div dir=3D"ltr">Have you looked at the Vine? Search for "Vine" at=A0=
<a
moz-do-not-send=3D"true"
href=3D"http://erights.org/elib/distrib/captp/index.html">http:=
//erights.org/elib/distrib/captp/index.html</a>
<div>and in the source code of=A0<a moz-do-not-send=3D"true"
href=3D"https://code.google.com/p/caja-captp/">https://code.g=
oogle.com/p/caja-captp/</a></div>
<div><br>
</div>
<div>I don't quite understand your question, so I'm not sure if
this is even relevant to the answer. Is it?</div>
<div><br>
</div>
<div><br>
</div>
</div>
<div class=3D"gmail_extra"><br>
<div class=3D"gmail_quote">On Sun, Feb 22, 2015 at 5:51 PM, Rob
Withers <span dir=3D"ltr"><<a moz-do-not-send=3D"true"
href=3D"mailto:[email protected]" target=3D"_blank=
">[email protected]</a>></span>
wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor=3D"#FFFFFF" text=3D"#000000"> I found some more
info: it looks as if the Ref in Alice's ProxyResolver is
being GCed, before resolution from Bob.=A0 This is specific
to my machinery, but knowing how Elib maintains a
reference to the Ref, in this case, may help make mine
better. How does Elib handle this?<br>
<br>
Thank you,<br>
- Robert
<div>
<div class=3D"h5"><br>
<br>
<div>On 2/22/2015 6:19 PM, Rob Withers wrote:<br>
</div>
<blockquote type=3D"cite"> I am stuck, both
conceptually, as well as understanding code I wrote
a long while ago.=A0 I was hoping to gain a little
insight from the list of the insides of resolution
redirection in the 3-way case.=A0 The recent change I
have made results from my thinking I finally
understand the ordering that MirandaMethods ensure.=A0
I made changes such that a whenMoreResolved directly
follows the message that generates is by adding to
the front of the msg queue.=A0 <br>
<br>
In the 3-way case, Carol is sending a message to
Alice, passing Bob.=A0 Alice receives the message and
executes, which sends a message to Bob, then returns
the result to Carol.=A0 In Alice's vat, the
DelayedRedirector is resolved to the RemotePromise
of the call to Bob, the return of Alice's
computation and I think it sends whenMoreResolved to
the proxy of the new promise resolver of the send to
Bob.=A0 What little tracing I have I am posting below=
,
as well as the DelayedRedirector value() and the
ProxyResolver resolve() code, at the bottom.=A0
However, this is my question, what should the
redirector do in Alice's Vat to propagate the
resolution from Bob, back to Carol?<br>
<br>
Thank you,<br>
- Robert<br>
<br>
<br>
// There are 3 messages sent to Bob, from Alice:<br>
// =A0=A0=A0 1) getTheAnswer, which returns 42, <br>
// =A0=A0=A0 2) <b>hashCode, again 42</b> and <br>
//=A0=A0 =A0 3) <b>whenMoreResolved</b>, to forward t=
o
the redirector back in Alice.<br>
<br>
0 [main] INFO
cc.ganymede.pauwau.presentation.AbstractPauwauTest=A0
- 3 Introducers starting<br>
549 [main] INFO
cc.ganymede.pauwau.presentation.AbstractPauwauTest=A0
- 3 Introducers on the air<br>
4553 [main] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverMessage(receiverId: 0
answerId: -1 resolverId: -1 action: lookupSwiss
args:
[497273074681788564315291637588644948944089734358])<b=
r>
4952 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverMessage(receiverId: 0
answerId: -1 resolverId: null action: lookupSwiss
args:
[497273074681788564315291637588644948944089734358])<b=
r>
4958 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: 1
action: value args: [NearRefImpl(hash: 109537538,
receiver: TestObject)])<br>
4998 [third-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId: 1
action: value args: [FarRefImpl(hash: 68783569)])<br>
5353 [main] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverMessage(receiverId: 0
answerId: -1 resolverId: -1 action: lookupSwiss
args:
[-686254831702855955980329529540587585277617841038])<=
br>
5593 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverMessage(receiverId: 0
answerId: -1 resolverId: null action: lookupSwiss
args:
[-686254831702855955980329529540587585277617841038])<=
br>
5593 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: 1
action: value args: [NearRefImpl(hash: 1530099003,
receiver: TestObject)])<br>
6201 [main] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverMessage(receiverId: -1
answerId: -2 resolverId: -2 action:
redirectForTheAnswer args:
[RemotePromiseRefImpl(hash: 1034568234)])<br>
6203 [main] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverMessage(receiverId: 0
answerId: -2 resolverId: -2 action: provideFor args:
[-568687285196004884954480990488973591228663758441,
RemotePromiseRefImpl(hash: 1034568234),
-676914875674370369045480105305401075435688776666])<b=
r>
6239 [main] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverMessage(receiverId: -2
answerId: -3 resolverId: -3 action: hashCode args:
[])<br>
6255 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverMessage(receiverId: 0
answerId: -2 resolverId: null action: provideFor
args:
[-568687285196004884954480990488973591228663758441,
NearRefImpl(hash: 1530099003, receiver: TestObject),
-676914875674370369045480105305401075435688776666])<b=
r>
6259 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: 2
action: value args: [NearRefImpl(hash: 1323165787,
receiver:
cc.ganymede.pauwau.presentation.lib.vat.Vine@4842def1=
)])<br>
6403 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverMessage(receiverId: 0
answerId: -1 resolverId: -1 action: acceptFrom args:
[HouseAtreides:10003/-6879340178615732923349555673501=
02524989066643525,
-676914875674370369045480105305401075435688776666,
cc.ganymede.pauwau.presentation.lib.vat.Vine@6a8400ff=
])<br>
6410 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverMessage(receiverId: -1
answerId: -2 resolverId: null action:
redirectForTheAnswer args:
[RemotePromiseRefImpl(hash: 598908224)])<br>
6411 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverMessage(receiverId: -2
answerId: -3 resolverId: null action: hashCode args:
[])<br>
6411 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverMessage(receiverId: -1
answerId: -2 resolverId: -2 action: getTheAnswer
args: [])<br>
6412 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverMessage(receiverId: -2
answerId: -3 resolverId: -3 action: hashCode args:
[])<br>
6412 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: -2
action: whenMoreResolved args: [RedirectorProxy:
FarRefImpl(hash: 177595052)])<br>
6766 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverMessage(receiverId: 0
answerId: -1 resolverId: null action: acceptFrom
args:
[HouseAtreides:10003/-6879340178615732923349555673501=
02524989066643525,
-676914875674370369045480105305401075435688776666,
FarRefImpl(hash: 690984748)])<br>
6767 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverMessage(receiverId: -1
answerId: -2 resolverId: null action: getTheAnswer
args: [])<br>
6767 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverMessage(receiverId: -2
answerId: -3 resolverId: null action: hashCode args:
[])<br>
6767 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId: -2
action: whenMoreResolved args: [NearRefImpl(hash:
363771261, receiver: RedirectorProxy:
FarRefImpl(hash: 196981675))])<br>
6768 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: 2
action: value args: [NearRefImpl(hash: 1530099003,
receiver: TestObject)])<br>
6769 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: 3
action: value args: [NearRefImpl(hash: 790206055,
receiver: 42)])<br>
<b>6770 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: 4
action: value args: [NearRefImpl(hash: 878991039,
receiver: 42)])</b><b><br>
</b><b>6771 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: 5
action: value args: [NearRefImpl(hash: 790206055,
receiver: 42)])</b><b><br>
</b>6805 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId: 2
action: value args: [FarRefImpl(hash: 1332394016)])<b=
r>
6805 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId: 3
action: value args: [42])<br>
<b>6805 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId:
4 action: value args: [42])</b><b><br>
</b><b>6805 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId:
5 action: value args: [42])</b><b><br>
</b>6806 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: DeliverOnlyMessage(receiverId: 3
action: value args: [42])<br>
19932 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: GCAnswerMessage(answerId: -1)<br>
19934 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: GCAnswerMessage(answerId: -2)<br>
19934 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: GCAnswerMessage(answerId: -3)<br>
19984 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: GCAnswerMessage(answerId: -1)<br>
19984 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: GCAnswerMessage(answerId: -2)<br>
19985 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: GCAnswerMessage(answerId: -3)<br>
29679 [third-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: GCAnswerMessage(answerId: -1)<br>
29680 [third-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId: 1
action: value args: [FarRefImpl(hash: 734824022)])<br=
>
29680 [third-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId: 2
action: value args: [FarRefImpl(hash: 1223086084)])<b=
r>
29680 [third-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: DeliverOnlyMessage(receiverId: 3
action: value args: [42])<br>
29681 [third-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: GCAnswerMessage(answerId: -1)<br>
29681 [third-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: GCAnswerMessage(answerId: -2)<br>
29682 [third-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
sending message: GCAnswerMessage(answerId: -2)<br>
29722 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: GCAnswerMessage(answerId: -1)<br>
29722 [second-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: GCAnswerMessage(answerId: -2)<br>
29726 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: GCAnswerMessage(answerId: -1)<br>
29726 [first-vat] DEBUG
cc.ganymede.pauwau.presentation.PauwauTerminal=A0 -
receiving message: GCAnswerMessage(answerId: -2)<br>
<br>
<br>
<br>
<b>// DelayedRedirector code:</b><br>
=A0=A0=A0 public void value(Object obj) throws
NotResolvedException {<br>
=A0=A0=A0 =A0=A0=A0 if(resolver =3D=3D null)<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 return;<br>
<br>
=A0=A0=A0 =A0=A0=A0 if(resolver.isFresh()) {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 resolver.resolve(obj);<=
br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 resolver =3D null;<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 return;<br>
=A0=A0=A0 =A0=A0=A0 }<br>
<br>
=A0=A0=A0 =A0=A0=A0 if(RefUtil.isLocal(obj)) {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 resolver.resolve(obj);<=
br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 resolver =3D null;<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 return;<br>
=A0=A0=A0 =A0=A0=A0 }<br>
<br>
=A0=A0=A0 =A0=A0=A0 Ref ref =3D (Ref)RefUtil.wrap(obj=
,
resolver.handler.getVat());<br>
=A0=A0=A0 =A0=A0=A0 boolean isLocalToResolverScope =3D=
false;<br>
=A0=A0=A0 =A0=A0=A0 try {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 isLocalToResolverScope =
=3D
RefUtil.isLocalToScope(resolver.handler.scope, ref);<=
br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 if(isLocalToResolverSco=
pe) {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 resolver.reso=
lve(obj);<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 resolver =3D =
null;<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 return;<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 }<br>
=A0=A0=A0 =A0=A0=A0 } catch (Exception e) {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 reactToLostClient(e);<b=
r>
=A0=A0=A0 =A0=A0=A0 }<br>
<br>
=A0=A0=A0 =A0=A0=A0 Pair<PromiseRefImpl, Resolver&=
gt; pair =3D
RefUtil.promise(ref.getVat());<br>
=A0=A0=A0 =A0=A0=A0 Redirector redirector =3D new
Redirector((ProxyResolver) pair.second());<br>
=A0=A0=A0 =A0=A0=A0
resolver.getProxy().whenResolved(redirector);<br>
=A0=A0=A0 =A0=A0=A0 resolver.resolve(pair.first());<b=
r>
=A0=A0=A0 =A0=A0=A0 resolver =3D null;<br>
=A0=A0=A0 }<br>
<br>
<br>
<b>// ProxyResolver code:</b><br>
=A0=A0=A0 public void resolve(final Object result) th=
rows
NotResolvedException {<br>
=A0=A0=A0 =A0=A0=A0 handler.scope.getVat().sendRunnab=
le(new
Runnable() {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 public void run() {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 if(ref =3D=3D=
null)<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 ret=
urn;<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 if(ref.get() =
=3D=3D null)<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 ret=
urn;<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0
if(Exception.class.isAssignableFrom(result.getClass()=
))
{<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 }<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 Ref newRef =3D=
RefUtil.wrap(result,
handler.scope.getVat());<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 try {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 if =
(newRef =3D=3D null)<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=
=A0=A0 =A0=A0=A0
ref.get().getRefImpl().becomeContext(null);<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 els=
e<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=
=A0=A0
ref.get().getRefImpl().becomeContext(newRef.getRefImp=
l());<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0
if(RefUtil.isResolved(newRef.getRefImpl())) {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=
=A0=A0 handler =3D null;<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=
=A0=A0 ref =3D null;<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 }<b=
r>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 } catch (NotR=
esolvedException e) {<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // =
TODO Auto-generated catch
block<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 e.p=
rintStackTrace();<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 }<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 }});<br>
=A0=A0=A0 }<br>
<br>
</blockquote>
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-- <br>
<div class=3D"gmail_signature">=A0 =A0 Cheers,<br>
=A0 =A0 --MarkM</div>
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