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int_counter.go
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int_counter.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 (
"reflect"
"sync"
)
type intCounter struct {
val int64
target int64
lock sync.Mutex
}
// NewIntCounter returns a counter working with integers.
func NewIntCounter(initial, target int64) Counter {
return &intCounter{
val: initial,
target: target,
}
}
func (i *intCounter) Reset() Counter {
i.lock.Lock()
defer i.lock.Unlock()
i.val = 0
return i
}
func (i *intCounter) Increase() Counter {
i.lock.Lock()
defer i.lock.Unlock()
if i.val == i.target {
i.val = 0
return i
}
i.val++
return i
}
func (i *intCounter) Decrease() Counter {
i.lock.Lock()
defer i.lock.Unlock()
if i.val == 0 {
return i
}
i.val--
return i
}
func (i *intCounter) Value(out interface{}) Counter {
i.lock.Lock()
defer i.lock.Unlock()
v := reflect.ValueOf(out)
if v.Kind() == reflect.Ptr && !v.IsNil() {
v = v.Elem()
}
v.Set(reflect.ValueOf(i.val))
return i
}
func (i *intCounter) Hit() bool {
i.lock.Lock()
defer i.lock.Unlock()
return i.val == i.target
}