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package telegraf
// Processor is a processor plugin interface for defining new inline processors.
// these are extremely efficient and should be used over StreamingProcessor if
// you do not need asynchronous metric writes.
type Processor interface {
PluginDescriber
// Apply the filter to the given metric.
Apply(in ...Metric) []Metric
}
// StreamingProcessor is a processor that can take in a stream of messages
type StreamingProcessor interface {
PluginDescriber
// Start is called once when the plugin starts; it is only called once per
// plugin instance, and never in parallel.
// Start should return once it is ready to receive metrics.
// The passed in accumulator is the same as the one passed to Add(), so you
// can choose to save it in the plugin, or use the one received from Add().
Start(acc Accumulator) error
// Add is called for each metric to be processed. The Add() function does not
// need to wait for the metric to be processed before returning, and it may
// be acceptable to let background goroutine(s) handle the processing if you
// have slow processing you need to do in parallel.
// Keep in mind Add() should not spawn unbounded goroutines, so you may need
// to use a semaphore or pool of workers (eg: reverse_dns plugin does this)
// Metrics you don't want to pass downstream should have metric.Drop() called,
// rather than simply omitting the acc.AddMetric() call
Add(metric Metric, acc Accumulator) error
// Stop gives you an opportunity to gracefully shut down the processor.
// Once Stop() is called, Add() will not be called any more. If you are using
// goroutines, you should wait for any in-progress metrics to be processed
// before returning from Stop().
// When stop returns, you should no longer be writing metrics to the
// accumulator.
Stop()
}
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