com.google.instrumentation.stats

Class IntervalAggregationDescriptor

java.lang.Object

com.google.instrumentation.stats.IntervalAggregationDescriptor

public final class IntervalAggregationDescriptor
extends Object

Describes data aggregations based on time intervals.

Method Summary

Modifier and Type	Method and Description
static IntervalAggregationDescriptor	create(int numSubIntervals, List<Duration> intervalSizes) Constructs a new IntervalAggregationDescriptor.
static IntervalAggregationDescriptor	create(List<Duration> intervalSizes) Constructs a new IntervalAggregationDescriptor with the number of sub intervals set to the default value of 5.
List<Duration>	getIntervalSizes() The time intervals to record for the aggregation.
int	getNumSubIntervals() The number of sub intervals.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

create

public static IntervalAggregationDescriptor create(int numSubIntervals,
                                                   List<Duration> intervalSizes)

Constructs a new IntervalAggregationDescriptor.

The given numSubIntervals must be in the range [2, 20], see getNumSubIntervals() for more details.

The given intervalSizes must have at least one entry.

create

public static IntervalAggregationDescriptor create(List<Duration> intervalSizes)

Constructs a new IntervalAggregationDescriptor with the number of sub intervals set to the default value of 5.

getNumSubIntervals

public int getNumSubIntervals()

The number of sub intervals.

The number of internal sub-intervals to use when collecting stats for each interval. The max error in interval measurements will be approximately 1/getNumSubIntervals() (although in practice, this will only be approached in the presence of very large and bursty workload changes), and underlying memory usage will be roughly proportional to the value of this field. Must be in the range [2, 20]. A value of 5 will be used if this is unspecified.

getIntervalSizes

public List<Duration> getIntervalSizes()

The time intervals to record for the aggregation.

Note: The returned list is unmodifiable, attempts to update it will throw an UnsupportedOperationException.