Package com.elastisys.autoscaler.metricstreamers.streamjoiner.stream

Class JoiningMetricStream

java.lang.Object

com.elastisys.autoscaler.metricstreamers.streamjoiner.stream.JoiningMetricStream

All Implemented Interfaces:

com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStream

public class JoiningMetricStream
extends java.lang.Object
implements com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStream

Creates a new JoiningMetricStream which listens to the EventBus for metric values on the MetricStreams that it has been instructed to observe. Whenever values have been observed on all streams and are not farther apart than MetricStreamDefinition.getMaxTimeDiff(), the join script is run to produce a new MetricValue that is sent over the EventBus as a MetricStreamMessage.

The client is responsible for calling the start() method, which causes the JoiningMetricStream to register with the EventBus and start listening for metrics. When the client is done using the JoiningMetricStream it should call stop() to ensure that the JoiningMetricStream unregisters from the EventBus and stops processing events.

Constructor Summary

Constructors

Constructor	Description
JoiningMetricStream(org.slf4j.Logger logger, com.elastisys.scale.commons.eventbus.EventBus eventBus, JoiningMetricStreamConfig config)

Method Summary

Modifier and Type	Method	Description
java.lang.String	getId()
java.lang.String	getMetric()
void	onMetricEvent(com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStreamMessage metricBatch)	Called whenever a metric batch is sent on the EventBus.
com.elastisys.autoscaler.core.monitoring.metricstreamer.api.query.QueryResultSet	query(org.joda.time.Interval timeInterval, com.elastisys.autoscaler.core.monitoring.metricstreamer.api.query.QueryOptions options)	A no-op.
void	start()	Register this JoiningMetricStream with the EventBus to start processing metric values.
void	stop()	Unregister JoiningMetricStream from the EventBus.

Methods inherited from class java.lang.Object

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

Constructor Detail

JoiningMetricStream

public JoiningMetricStream(org.slf4j.Logger logger,
                           com.elastisys.scale.commons.eventbus.EventBus eventBus,
                           JoiningMetricStreamConfig config)

Method Detail

getId

public java.lang.String getId()

Specified by:

getId in interface com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStream

getMetric

public java.lang.String getMetric()

Specified by:

getMetric in interface com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStream

query

public com.elastisys.autoscaler.core.monitoring.metricstreamer.api.query.QueryResultSet query(org.joda.time.Interval timeInterval,
                                                                                              com.elastisys.autoscaler.core.monitoring.metricstreamer.api.query.QueryOptions options)
                                                                                       throws com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStreamException

A no-op. The JoiningMetricStream does not support historical metric queries.

Specified by:

query in interface com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStream

Throws:

com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStreamException

start

public void start()

Register this JoiningMetricStream with the EventBus to start processing metric values.

stop

public void stop()

Unregister JoiningMetricStream from the EventBus. From this point on, the JoiningMetricStream is useless.

onMetricEvent

public void onMetricEvent(com.elastisys.autoscaler.core.monitoring.metricstreamer.api.MetricStreamMessage metricBatch)

Called whenever a metric batch is sent on the EventBus.

Parameters:

message -