/usr/share/gocode/src/github.com/rcrowley/go-metrics/registry.go is in golang-metrics-dev 0.0~git20140119-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import "sync"
// A Registry holds references to a set of metrics by name and can iterate
// over them, calling callback functions provided by the user.
//
// This is an interface so as to encourage other structs to implement
// the Registry API as appropriate.
type Registry interface {
// Call the given function for each registered metric.
Each(func(string, interface{}))
// Get the metric by the given name or nil if none is registered.
Get(string) interface{}
// Gets an existing metric or creates and registers a new one.
GetOrRegister(string, interface{}) interface{}
// Register the given metric under the given name.
Register(string, interface{})
// Run all registered healthchecks.
RunHealthchecks()
// Unregister the metric with the given name.
Unregister(string)
}
// The standard implementation of a Registry is a mutex-protected map
// of names to metrics.
type StandardRegistry struct {
metrics map[string]interface{}
mutex sync.Mutex
}
// Create a new registry.
func NewRegistry() Registry {
return &StandardRegistry{metrics: make(map[string]interface{})}
}
// Call the given function for each registered metric.
func (r *StandardRegistry) Each(f func(string, interface{})) {
for name, i := range r.registered() {
f(name, i)
}
}
// Get the metric by the given name or nil if none is registered.
func (r *StandardRegistry) Get(name string) interface{} {
r.mutex.Lock()
defer r.mutex.Unlock()
return r.metrics[name]
}
// Gets an existing metric or creates and registers a new one. Threadsafe
// alternative to calling Get and Register on failure.
func (r *StandardRegistry) GetOrRegister(name string, i interface{}) interface{} {
r.mutex.Lock()
defer r.mutex.Unlock()
if metric, ok := r.metrics[name]; ok {
return metric
}
r.register(name, i)
return i
}
// Register the given metric under the given name.
func (r *StandardRegistry) Register(name string, i interface{}) {
r.mutex.Lock()
defer r.mutex.Unlock()
r.register(name, i)
}
// Run all registered healthchecks.
func (r *StandardRegistry) RunHealthchecks() {
r.mutex.Lock()
defer r.mutex.Unlock()
for _, i := range r.metrics {
if h, ok := i.(Healthcheck); ok {
h.Check()
}
}
}
// Unregister the metric with the given name.
func (r *StandardRegistry) Unregister(name string) {
r.mutex.Lock()
defer r.mutex.Unlock()
delete(r.metrics, name)
}
func (r *StandardRegistry) register(name string, i interface{}) {
switch i.(type) {
case Counter, Gauge, Healthcheck, Histogram, Meter, Timer:
r.metrics[name] = i
}
}
func (r *StandardRegistry) registered() map[string]interface{} {
metrics := make(map[string]interface{}, len(r.metrics))
r.mutex.Lock()
defer r.mutex.Unlock()
for name, i := range r.metrics {
metrics[name] = i
}
return metrics
}
var DefaultRegistry Registry = NewRegistry()
// Call the given function for each registered metric.
func Each(f func(string, interface{})) {
DefaultRegistry.Each(f)
}
// Get the metric by the given name or nil if none is registered.
func Get(name string) interface{} {
return DefaultRegistry.Get(name)
}
// Gets an existing metric or creates and registers a new one. Threadsafe
// alternative to calling Get and Register on failure.
func GetOrRegister(name string, i interface{}) interface{} {
return DefaultRegistry.GetOrRegister(name, i)
}
// Register the given metric under the given name.
func Register(name string, i interface{}) {
DefaultRegistry.Register(name, i)
}
// Run all registered healthchecks.
func RunHealthchecks() {
DefaultRegistry.RunHealthchecks()
}
// Unregister the metric with the given name.
func Unregister(name string) {
DefaultRegistry.Unregister(name)
}
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