Package software.amazon.awssdk.metrics.publishers.cloudwatch.internal.transform

Class MetricCollectionAggregator

java.lang.Object

software.amazon.awssdk.metrics.publishers.cloudwatch.internal.transform.MetricCollectionAggregator

@NotThreadSafe
public class MetricCollectionAggregator
extends Object

Aggregates MetricCollections by: (1) the minute in which they occurred, and (2) the dimensions in the collection associated with that metric. Allows retrieving the aggregated values as a list of PutMetricDataRequests.

It would be too expensive to upload every MetricCollection as a unique PutMetricDataRequest, so this class aggregates the data so that multiple MetricCollections can be placed in the same PutMetricDataRequest.

Warning: This class is *not* thread-safe.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MAX_METRIC_DATA_PER_REQUEST	The maximum number of MetricDatums allowed in PutMetricDataRequest.metricData().
static final int	MAX_VALUES_PER_REQUEST	The maximum number of unique MetricDatum.values() allowed in a single PutMetricDataRequest.

Constructor Summary

Constructors

Constructor	Description
MetricCollectionAggregator(String namespace, Set<SdkMetric<String>> dimensions, Set<MetricCategory> metricCategories, MetricLevel metricLevel, Set<SdkMetric<?>> detailedMetrics)

Method Summary

Modifier and Type	Method	Description
void	addCollection(MetricCollection collection)	Add a collection to this aggregator.
List<PutMetricDataRequest>	getRequests()	Get all PutMetricDataRequests that can be generated from the data that was added via addCollection(MetricCollection).

Methods inherited from class java.lang.Object

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

Field Details

MAX_METRIC_DATA_PER_REQUEST

public static final int MAX_METRIC_DATA_PER_REQUEST

The maximum number of MetricDatums allowed in PutMetricDataRequest.metricData(). This limit is imposed by CloudWatch.

See Also:

• Constant Field Values

MAX_VALUES_PER_REQUEST

public static final int MAX_VALUES_PER_REQUEST

The maximum number of unique MetricDatum.values() allowed in a single PutMetricDataRequest. This limit is not imposed directly by CloudWatch, but they do impose a 40KB limit for a single request. This value was determined by trial-and-error to roughly equate to a 40KB limit when we are also at the MAX_METRIC_DATA_PER_REQUEST.

See Also:

• Constant Field Values

Constructor Details

MetricCollectionAggregator

public MetricCollectionAggregator(String namespace,
 Set<SdkMetric<String>> dimensions,
 Set<MetricCategory> metricCategories,
 MetricLevel metricLevel,
 Set<SdkMetric<?>> detailedMetrics)

Method Details

addCollection

public void addCollection(MetricCollection collection)

Add a collection to this aggregator.

getRequests

public List<PutMetricDataRequest> getRequests()

Get all PutMetricDataRequests that can be generated from the data that was added via addCollection(MetricCollection). This method resets the state of this MetricCollectionAggregator.