Re: [rules-users] Fusion, Insert Events with timestamp in the past.
On 04/06/2014, SebastianStehle <mail2stehle(a)gmail.com> wrote:
We made another test with the pseudclock where we advanced the time
after
each measurement.
Lets say we have the two measurements, the first at 10am and the second at
11am. Based on the rule before, you would expect that the rule fires at
10:10am because no other event is inserted. But what happens was that the
rule is activated at 11am, because the clock has not been advanced in the
meantime. This makes totally sense for me, so I thought you might need
another thread or so.
Absolutely.
If you implement it like this (pseudo-code), it works fine:
session.insert(first);
clock.advanceTime(first.getTime());
while (time < second.getTime()) {
clock.advanceTime(100);
time.add(100ms);
}
session.insert(second);
clock.advanceTime(second.getTime());
Right, this should take care of the timers.
What makes our scenario very complicated is that we mix realtime and
pseudo-time a little bit. For example we have timers that trigger at
midnight or so (in realtime) and we have measurmenets with a delay of some
seconds, where we need a pseudoclock. I have no real idea how this can be
realized, but I still wonder, what @timestamp is for, if it cannot combined
with the normal clock.
The time of measurements is one progress of time, and when you need a
midnight event, you should ask one of the measurement providers. If
midnight is a more or less arbitrary point in that progress of time,
you can use your local clock.
There is an European norm that deals with the reliability of networks.
If you have to expect delays, you may have to detect them, and decide
what counter-action to employ.
IIRC, at the start if this thread there was the issue of updating
rules. There is the option of changing the rules "on the fly", without
creating a new session. And there may be a different approach,
deriving "state" from a sequence of events, rather than trying to
keep the sequence with its timestamps - but this depends on what the
events signify.
-W
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