Examples of com.custardsource.parfait.dxm.PcpMmvWriter

com.custardsource.parfait.dxm.PcpMmvWriter

Creates and updates a memory-mapped file suitable for reading by the PCP MMV PMDA. The method used to 'render' the Java values into the file (converting them to a corresponding PCP Type and byte array) are determined by {@link TypeHandler TypeHandlers}; some default TypeHandlers are supplied (see {@link DefaultTypeHandlers#getDefaultMappings()}) but additional ones can be supplied for a particular Java class ( {@link #registerType(Class,TypeHandler)}, or on a metric-by-metric basis.

Standard lifecycle for this class is:

create the PcpMmvFile
{@link #addMetric(MetricName,Object)} for every metric which will be monitored by the file
{@link #start()} to write out the file ready for the MMV agent to read
{@link #updateMetric(MetricName,Object)} metrics as new values come to hand

Adding metrics after the file is started will result in an {@link IllegalStateException}, as will updating metric values before it's started.

This class currently has a few important limitations:

Process ID is obtained in a Sun HotSpot-JVM specific way (likely to work on other JVMs but not guaranteed)
Receiving agent must be using MMV agent version 2.8.10 or later (version 1 of the MMV on-disk format)

@author Cowan

        MonitorableRegistry monitorableRegistry = new MonitorableRegistry();


        List<MonitoredCounter> counters = createCounters(numCounters, monitorableRegistry);




        final PcpMmvWriter mmvWriter = new PcpMmvWriter("parfait-microbenchmark-" + StandardMetricThroughPutBenchmark.class.getSimpleName() + ".mmv", IdentifierSourceSet.DEFAULT_SET);
        mmvWriter.setPerMetricLock(usePerMetricLock);


        mmvWriter.setClusterIdentifier(CLUSTER_IDENTIFIER);


        final PcpMonitorBridge pcpMonitorBridge = new PcpMonitorBridge(mmvWriter, MetricNameMapper.PASSTHROUGH_MAPPER, new MetricDescriptionTextSource(), new EmptyTextSource());


        SelfStartingMonitoringView selfStartingMonitoringView = new SelfStartingMonitoringView(monitorableRegistry, pcpMonitorBridge, 2000);

Examples of com.custardsource.parfait.dxm.PcpMmvWriter

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