org.hawkular.agent.prometheus

Class PrometheusMetricDataParser<T>

java.lang.Object

org.hawkular.agent.prometheus.PrometheusMetricDataParser<T>

Type Parameters:

T - the metric family object type that the parser produces

Direct Known Subclasses:

TextPrometheusMetricDataParser

public abstract class PrometheusMetricDataParser<T>
extends Object

An object that can parse Prometheus found in a specific data format in an input stream. The type is the metric family object for the specific data format. It is the job of the associated PrometheusMetricsProcessor to process the parsed data.

Constructor Summary

Constructors

Constructor and Description
PrometheusMetricDataParser(InputStream inputStream) Provides the input stream where the parser will look for metric data.

Method Summary

Modifier and Type	Method and Description
protected InputStream	getInputStream()
abstract T	parse() Reads a single metric family from the Prometheus metric data stream and returns it.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrometheusMetricDataParser

public PrometheusMetricDataParser(InputStream inputStream)

Provides the input stream where the parser will look for metric data. NOTE: this object will not own this stream - it should never attempt to close it.

Parameters:

inputStream - the stream where the metric data can be found

Method Detail

getInputStream

protected InputStream getInputStream()

parse

public abstract T parse()
                 throws IOException

Reads a single metric family from the Prometheus metric data stream and returns it. Returns null when no more data is in the stream. This method is designed to be called several times, each time it returns the next metric family found in the input stream.

Returns:

the metric family data found in the stream, or null

Throws:

IOException - if failed to read the data from the stream