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manager.go
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manager.go
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// Copyright © 2021 Elis Lulja
//
// 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
//
// http://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 hitcount
import "sync"
var (
managersList map[string]CounterManager = map[string]CounterManager{}
)
// CounterManager is in charge of handling different counters.
type CounterManager interface {
Add(string, Counter) CounterManager
Remove(string) CounterManager
ResetAllExcept(...string) CounterManager
Get(string) Counter
}
type mgr struct {
counters map[string]Counter
lock sync.Mutex
}
// Manager returns a CounterManager or creates a new one if it doesn't exist.
func Manager(key string) CounterManager {
m, exists := managersList[key]
if !exists {
managersList[key] = &mgr{
counters: map[string]Counter{},
}
m = managersList[key]
}
return m
}
func (m *mgr) Add(key string, count Counter) CounterManager {
m.lock.Lock()
defer m.lock.Unlock()
if len(key) == 0 || count == nil {
return m
}
if _, exists := m.counters[key]; exists {
return m
}
m.counters[key] = count
return m
}
func (m *mgr) Remove(key string) CounterManager {
m.lock.Lock()
defer m.lock.Unlock()
if len(key) == 0 {
return m
}
if _, exists := m.counters[key]; !exists {
return m
}
delete(m.counters, key)
return m
}
func (m *mgr) ResetAllExcept(except ...string) CounterManager {
m.lock.Lock()
defer m.lock.Unlock()
for key, counter := range m.counters {
ignore := false
for _, exp := range except {
if key == exp {
ignore = true
}
}
if ignore {
continue
}
counter.Reset()
}
return m
}
func (m *mgr) Get(key string) Counter {
m.lock.Lock()
defer m.lock.Unlock()
counter, exists := m.counters[key]
if !exists {
return nil
}
return counter
}