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global_provider_registry.go
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/
global_provider_registry.go
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package scalarule
import (
"fmt"
"sort"
)
// globalProviderRegistry is the default registry singleton.
var globalProviderRegistry = NewProviderRegistryMap()
// GlobalProviderRegistry returns a reference to the global ProviderRegistry
// implementation.
func GlobalProviderRegistry() ProviderRegistry {
return globalProviderRegistry
}
// ProviderRegistryMap implements ProviderRegistry using a map.
type ProviderRegistryMap struct {
providers map[string]Provider
}
func NewProviderRegistryMap() *ProviderRegistryMap {
return &ProviderRegistryMap{
providers: make(map[string]Provider),
}
}
// ProviderNames implements part of the ProviderRegistry interface.
func (p *ProviderRegistryMap) ProviderNames() []string {
names := make([]string, 0, len(p.providers))
for name := range p.providers {
names = append(names, name)
}
sort.Strings(names)
return names
}
// RegisterProvider implements part of the ProviderRegistry interface.
func (p *ProviderRegistryMap) RegisterProvider(name string, provider Provider) error {
_, ok := p.providers[name]
if ok {
return fmt.Errorf("provider already registered: %q", name)
}
p.providers[name] = provider
return nil
}
// LookupProvider implements part of the RuleRegistry interface.
func (p *ProviderRegistryMap) LookupProvider(name string) (Provider, bool) {
provider, ok := p.providers[name]
if !ok {
return nil, false
}
return provider, true
}