freaking out in standalone mode where the server is started, and shutdown
and started again repeatedly.
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whether or not we're already shutdown as it may have shutdown
unexpectedly.
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response telling them to upgrade. Note to self, do the thing where the
server immediately writes the version number to the auth stream so that we
don't have to worry about this sort of legacy crap.
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the first 80 characters if this every actually discovers an anomaly rather
than just dutifully reporting every time someone updates really lengthy
crew news.
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'iterator()' name and deprecate the old 'entries()' method.
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the PresentsClient which can then use it to fill in things like access
control information for the user. We could use this to replace the
UserStash mechanism we use on Yohoho, but that works so I doubt I'll do
that. However, this is needed to do things the more elegant way on future
projects, like Game Gardens.
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that were using the old default (usually null) to use the new default.
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together in one JVM and both interoperate with the AWT thread in a manner
so harmonious as to bring a tear to the eye. This was surprisingly much
easier that I expected, thanks to my eminently sensible initial design,
I'm sure. ;)
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there will be relatively few of those (at most one per client that is
experiencing lag) and while the client is experiencing lag we will be
trying to write their data once per pass through the sockets (which could
be hundreds of times a second) and we don't want each write attempt to
result in the creation of a temporary direct buffer.
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the throes of a previous connection. Also don't spuriously recreate our
ticker because it's very possible for logon() to be called and not
logoff(), logon() might fail, for example.
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changed the output format to be the same as the one for DObjectManager
profiling output.
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actually dispatching the event to subscribers. We can't trust anyone.
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objects (DSet, arrays) in a DEvent (which should not change as a result of
other events being applied) and those in the object itself (which do
change and evolve as events are applied to the object).
This is important both because the DEvent is passed on to another thread
for delivery to remote clients, thus changes to the values in the event
could take place before they were serialized and sent over the network,
and because compound events are applied to an object before they are sent
to the other thread for delivery and thus, for example, setting a DSet and
then adding a few entries to it in a compound event would result in the
DEvent copy of the DSet becoming corrupted.
Two problems remain (note, neither of these are new, the one issue
introduced when I rewrote the DObject stuff is fixed by these checkins):
1. Object subscription requests are supposed to deliver a snapshot of the
object at the point in the event stream at which the subscription
request was processed, but presently we pass only a reference to the
object off to the networking thread which means that before the object
is serialized and sent to clients, subsequent events could be applied
to it and then those events would be sent to the client as well
resulting in funny business (probably nothing more than duplicate DSet
entry warnings, but imagination and Chapter 17 tell us that worse
things could happen).
2. The use of Streamable instances could result in badness. If a field in
a Streamable is modified and the whole Streamable set() back into the
object to broadcast the update, then further changes were made to the
Streamable before the attribute change event was serialized and sent
over the network, the second modifications would be reflected in the
event triggered by the first modifications.
The first problem may be solvable (albeit inefficiently) by serializing
the DObject on the event dispatcher thread and sending that serialized
copy off to the network thread for delivery to the client. It would be
much less efficient as we would be unable to make use of the client's
already "primed" ObjectOutputStream which may have already mapped many of
the classes in the object to two byte codes, but object subscription is
fairly uncommon compared to delivery of events, so inefficiency might not
be a big problem in this case.
The second problem might be solved by requiring that all Streamable
implementations implement clone() and then cloning any Streamable
attribute just as we do an array or DSet during an attribute, array
element or DSet entry change. This would be a more significant performance
hit as well as require a review of all of our Streamable classes (to
determine if they need a custom clone() implementation), and it has up to
now not actually manifested as a problem.
In any case I'm not going to tackle either of these remedies at the moment
because I'm on vacation, dammit.
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accomplish our "previous value" support in the distributed object system
without using reflection and could also avoid using reflection in the case
where we have already applied the event on the server (which is generally
the case on the server).
Rather than hacking up the gendobj script, I took this opportunity also to
rewrite the DObject generation script as an Ant task and in doing so,
implemented another recent idea which is that we can just augment the
FooObject.java file instead of having a separate .dobj and .java file.
You'd think it was spring there's so much cleaning going on.
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There is no more SafeInterval, instead Intervals can be constructed with a RunQueue to use for expiring.
PresentsDObjectMgr implements RunQueue.
Client has a getRunQueue() method to get the client side RunQueue.
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it's unlikely that the rabbit hole will surprise us with further depth.
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classloader to use when unserializing objects off the network. Also fixed
the way custom classloaders were used as Class.forName(class, true,
loader) seems to be the proper way to go to have caching work and whatnot.
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effectively be accomplished with a combination of ResultListenerList and
ResultAdapter.
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Narya. I added directives to the compile line to prevent that from
happening again.
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load the project's service classes so that they are comparable. Also sort
everything to avoid pointless changes in regenerated source files when
Java decides to arbitrarily return the methods in a different order.
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GenReceiverTask (not yet implemented). Modified the task so that it can
load the service classes via a classpath declared inside ant, avoiding the
need to put project classes in Ant's classpath.
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generator. It handles inner classes slightly differently and prepends a
project-specific header to the generated classes.
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dispatching classes in Java to eliminate annoying dependency on the output
format of JDK 1.4.1's javap.
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mapped into the client table without mogrified names.
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both destroyed without any intervening event processing.
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Michael Bayne