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make error rate configureable

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This commit is contained in:
Bernhard Amann 2013-04-25 14:20:13 -07:00
parent 9802e2332d
commit 5608caf79a
1 changed files with 12 additions and 3 deletions
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15
scripts/base/frameworks/sumstats/plugins/hll_unique.bro
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@ -3,6 +3,11 @@
module SumStats;
export {
redef record Reducer += {
## The threshold when we switch to hll
hll_error_margin: double &default=0.01;
};
redef enum Calculation += {
## Calculate the number of unique values.
HLLUNIQUE
@ -19,14 +24,18 @@ redef record ResultVal += {
# Internal use only. This is not meant to be publically available
# because probabilistic data structures have to be examined using
# specialized bifs.
card: opaque of cardinality &default=hll_cardinality_init(0.01);
card: opaque of cardinality &optional;
# we need this in the compose hook.
hll_error_margin: double &optional;
};
hook init_resultval_hook(r: Reducer, rv: ResultVal)
{
if ( HLLUNIQUE in r$apply && ! rv?$card )
rv$card = hll_cardinality_init(0.01);
rv$card = hll_cardinality_init(r$hll_error_margin);
rv$hll_error_margin = r$hll_error_margin;
rv$hllunique = 0;
}
@ -42,7 +51,7 @@ hook observe_hook(r: Reducer, val: double, obs: Observation, rv: ResultVal)
hook compose_resultvals_hook(result: ResultVal, rv1: ResultVal, rv2: ResultVal)
{
local rhll = hll_cardinality_init(0.01);
local rhll = hll_cardinality_init(rv1$hll_error_margin);
hll_cardinality_merge_into(rhll, rv1$card);
hll_cardinality_merge_into(rhll, rv2$card);