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registry.go
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registry.go
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/*
Copyright NetFoundry, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package xt
import (
"github.com/openziti/foundation/storage/boltz"
"sync"
"sync/atomic"
)
func init() {
globalRegistry = &defaultRegistry{
factories: ©OnWriteFactoryMap{
value: &atomic.Value{},
lock: &sync.Mutex{},
},
strategies: ©OnWriteStrategyMap{
value: &atomic.Value{},
lock: &sync.Mutex{},
},
lock: &sync.Mutex{},
}
globalRegistry.factories.value.Store(map[string]Factory{})
globalRegistry.strategies.value.Store(map[string]Strategy{})
}
func GlobalRegistry() Registry {
return globalRegistry
}
var globalRegistry *defaultRegistry
type defaultRegistry struct {
factories *copyOnWriteFactoryMap
strategies *copyOnWriteStrategyMap
lock *sync.Mutex
}
func (registry *defaultRegistry) RegisterFactory(factory Factory) {
registry.factories.put(factory.GetStrategyName(), factory)
}
func (registry *defaultRegistry) GetStrategy(name string) (Strategy, error) {
result := registry.strategies.get(name)
if result == nil {
registry.lock.Lock()
defer registry.lock.Unlock()
result = registry.strategies.get(name)
if result != nil {
return result, nil
}
factory := registry.factories.get(name)
if factory == nil {
return nil, boltz.NewNotFoundError("terminatorStrategy", "name", name)
}
result = factory.NewStrategy()
registry.strategies.put(factory.GetStrategyName(), result)
}
return result, nil
}
type copyOnWriteFactoryMap struct {
value *atomic.Value
lock *sync.Mutex
}
func (m *copyOnWriteFactoryMap) put(key string, value Factory) {
m.lock.Lock()
defer m.lock.Unlock()
var current = m.value.Load().(map[string]Factory)
mapCopy := map[string]Factory{}
for k, v := range current {
mapCopy[k] = v
}
mapCopy[key] = value
m.value.Store(mapCopy)
}
func (m *copyOnWriteFactoryMap) get(key string) Factory {
var current = m.value.Load().(map[string]Factory)
return current[key]
}
type copyOnWriteStrategyMap struct {
value *atomic.Value
lock *sync.Mutex
}
func (m *copyOnWriteStrategyMap) put(key string, value Strategy) {
m.lock.Lock()
defer m.lock.Unlock()
var current = m.value.Load().(map[string]Strategy)
mapCopy := map[string]Strategy{}
for k, v := range current {
mapCopy[k] = v
}
mapCopy[key] = value
m.value.Store(mapCopy)
}
func (m *copyOnWriteStrategyMap) get(key string) Strategy {
var current = m.value.Load().(map[string]Strategy)
return current[key]
}