The MetricsRegistry in yammer used to create metrics and register them
in the JMX.
The APIMetricsRegistry extends the functionality by accepting a URL
that the API will perform to retrieve the relevant data, it also creates
the API version of each of the requested Metric (i.e. APIMeter,
APICounter or APIHistogram)
Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>
Three of the Metric in the yammer library are based on data that is
pushed to them: Counter, Histogram and Meter.
This patch modify the specific functionality by inherit the original
Meter, keeping its functionality and API, and modify the way the data is
collected.
For Counter: A call to count will be implementing by calling the API to
retreive a value.
For Meter: A call to count will be implementing by calling the API to
retreive a value, similiar to count, but the timer aspect of the Meter
remains the same.
For histogram: Histogram uses an internal sample container. To mimic the
behaviour, a call to any of the historgram get functionality will update
the sample container first. A timestamp of the last update limits the
number of updates that will be done by the histogram.
Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>
