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// Copyright 2016 Circonus, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package circonusgometrics
import "fmt"
// A Counter is a monotonically increasing unsigned integer.
//
// Use a counter to derive rates (e.g., record total number of requests, derive
// requests per second).
// Increment counter by 1
func (m *CirconusMetrics) Increment(metric string) {
m.Add(metric, 1)
}
// IncrementByValue updates counter by supplied value
func (m *CirconusMetrics) IncrementByValue(metric string, val uint64) {
m.Add(metric, val)
}
// Set a counter to specific value
func (m *CirconusMetrics) Set(metric string, val uint64) {
m.cm.Lock()
defer m.cm.Unlock()
m.counters[metric] = val
}
// Add updates counter by supplied value
func (m *CirconusMetrics) Add(metric string, val uint64) {
m.cm.Lock()
defer m.cm.Unlock()
m.counters[metric] += val
}
// RemoveCounter removes the named counter
func (m *CirconusMetrics) RemoveCounter(metric string) {
m.cm.Lock()
defer m.cm.Unlock()
delete(m.counters, metric)
}
// GetCounterTest returns the current value for a counter. (note: it is a function specifically for "testing", disable automatic submission during testing.)
func (m *CirconusMetrics) GetCounterTest(metric string) (uint64, error) {
m.cm.Lock()
defer m.cm.Unlock()
if val, ok := m.counters[metric]; ok {
return val, nil
}
return 0, fmt.Errorf("Counter metric '%s' not found", metric)
}
// SetCounterFunc set counter to a function [called at flush interval]
func (m *CirconusMetrics) SetCounterFunc(metric string, fn func() uint64) {
m.cfm.Lock()
defer m.cfm.Unlock()
m.counterFuncs[metric] = fn
}
// RemoveCounterFunc removes the named counter function
func (m *CirconusMetrics) RemoveCounterFunc(metric string) {
m.cfm.Lock()
defer m.cfm.Unlock()
delete(m.counterFuncs, metric)
}
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