First cut at implementing a generic abstraction layer for pluggable
metrics providers. This first cut is closely modeled after Yammer
Metrics. It remains to be seen if it is indeed flexibel enough to
support other providers.
Provide a default implementation of this new abstraction layer
based on Yammer Metrics.
Support pluggable Monitoring Providers using Java 6's ServiceLoader.
Use this new abstraction layer to provide stats on (a) number of
Timeouts executed per second and (b) distribution of absolute
deviation between scheduled and actual Timeout execution time in
HashedWheelTimer.
* Interface ValueDistributionMonitor, a monitor for histograms.
* Interface EventRateMonitor, a monitor for measuring the rate per time
unit of specific events.
* Interface ValueMonitor, a monitor for tracking an arbitrary datum's
current value
* Interface CounterMonitor, a monitor for incrementing/decrementing a
long value
* Interface MonitorRegistry, a registry for monitors that serves as the
interface between Netty and concrete metrics providers as e.g. Yammer
Metrics.
* Interface MonitorRegistryFactory, to be implemented by metrics
providers.
* Document how to use Netty's new monitoring support in javadocs for
package io.netty.monitor.
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