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Previously we used the base::StatisticsRecorder object for storage by name. This is keyed by histogram name, which doesn't match our storage reality anymore. Instead we use a name to refer to a set of histogram instances that record data from different processes, as well as separating session and subsession data. In this re-write, we instead introduce the following lookup paths (managed in TelemetryHistogram.cpp): - Main storage: - (histogramId, processId, sessionOrSubsession) -> Histogram* - (histogramId, processId) -> KeyedHistogram* (this handles subsessions internally) - Lookup: - (histogramName) -> histogramId - (HistogramID) -> bool (is recording enabled for this histogram?) This is wrapped with a few lookup functions. This also allows us to keep HistogramIDs in the JS histogram instances now, instead of pointers to Histogram instances. That means Histogram instance life-time management is now properly contained inside TelemetryHistogram.cpp. MozReview-Commit-ID: 5yijGv7mc89 |
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