Hi,
I have a problem with the Adaptor. In transaction.c, it says:
/*
* Prepare appreq to use the given instance. The instance must be
locked.
*/
static void tr_prepareToUseInstance(WOAppReq *appreq, WOInstanceHandle
instHandle)
{
_WOInstance *instance;
instance = ac_lockedInstance(instHandle);
if (instance)
{
/* this will prevent the instance from being freed */
/* note that we are holding a write lock on the app */
instance->pendingResponses++;
/* This number is used in req_reformatRequest when updating the
request URL */
memcpy(appreq->instance, instance->instanceNumber,
WA_MAX_INSTANCE_NUMBER_LENGTH);
appreq->port = instance->port;
}
}
which downs the line leads to the "wrong" instance ID given to the
app. I.e. say you request
/cgi-bin/WebObjects/Foo.woa/20/...
then, if instance 20 does not exist or fails to reply quickly enough,
the adaptor changes this to free instance 10 and rewrites the request to
/cgi-bin/WebObjects/Foo.woa/10/...
before proceeding. Now, the problem is that there may several reasons
for 20 not to reply, but now instance 10 has no way of knowing that
the session that doesn't exist in it's own session store didn't really
expire but comes from a temporarily unavailable instance 20. Does
anyone have enough inside into the adaptors to say why the request is
rewritten? It looks pretty dumb to me, but maybe there is a good
reason... I think if should store the old request add at least a
header to indicate that this is not the intended instance.
At least the adaptor should keep a log of the occurences of a dead
instance, otherwise such a thing is a bitch to track down...
Cheers, Anjo
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