/
array.go
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/
array.go
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// Copyright 2014-2021 Aerospike, 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
//
// 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 atomic
import (
"fmt"
"sync"
)
// Array implement a fixed width array with atomic semantics
type Array struct {
items []interface{}
length int
mutex sync.RWMutex
}
// NewArray generates a new Array instance.
func NewArray(length int) *Array {
return &Array{
length: length,
items: make([]interface{}, length),
}
}
// Get atomically retrieves an element from the Array.
// If idx is out of range, it will return nil
func (aa *Array) Get(idx int) interface{} {
// do not lock if not needed
if idx < 0 || idx >= aa.length {
return nil
}
aa.mutex.RLock()
res := aa.items[idx]
aa.mutex.RUnlock()
return res
}
// Set atomically sets an element in the Array.
// If idx is out of range, it will return an error
func (aa *Array) Set(idx int, node interface{}) error {
// do not lock if not needed
if idx < 0 || idx >= aa.length {
return fmt.Errorf("index %d is larger than array size (%d)", idx, aa.length)
}
aa.mutex.Lock()
aa.items[idx] = node
aa.mutex.Unlock()
return nil
}
// Length returns the array size.
func (aa *Array) Length() int {
aa.mutex.RLock()
res := aa.length
aa.mutex.RUnlock()
return res
}