120 строки
3.2 KiB
Go
120 строки
3.2 KiB
Go
/*
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_____ _____ _____ ____ ______ _____ ------
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| --- | | | | |-----| |---- | | |-----| |----- ------
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| ____| |_____ | ____| | ____| | |_____| _____| |_____ |_____
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Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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Copyright © 2020-2024 Microsoft Corporation. All rights reserved.
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Author : <blobfusedev@microsoft.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE
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*/
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package common
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import (
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"sync"
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"time"
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)
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// Lock item for each file
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type LockMapItem struct {
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handleCount uint32
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exLocked bool
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mtx sync.Mutex
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downloadTime time.Time
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}
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// Map holding locks for all the files
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type LockMap struct {
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locks sync.Map
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}
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func NewLockMap() *LockMap {
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return &LockMap{}
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}
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// Map level operations
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// Get the lock item based on file name, if item does not exists create it
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func (l *LockMap) Get(name string) *LockMapItem {
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lockIntf, _ := l.locks.LoadOrStore(name, &LockMapItem{handleCount: 0, exLocked: false})
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item := lockIntf.(*LockMapItem)
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return item
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}
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// Delete item from file lock map
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func (l *LockMap) Delete(name string) {
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l.locks.Delete(name)
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}
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// Check if this file is already exLocked or not
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func (l *LockMap) Locked(name string) bool {
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lockIntf, ok := l.locks.Load(name)
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if ok {
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item := lockIntf.(*LockMapItem)
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return item.exLocked
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}
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return false
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}
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// Lock Item level operation
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// Lock this file exclusively
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func (l *LockMapItem) Lock() {
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l.mtx.Lock()
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l.exLocked = true
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}
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// UnLock this file exclusively
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func (l *LockMapItem) Unlock() {
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l.exLocked = false
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l.mtx.Unlock()
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}
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// Increment the handle count
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func (l *LockMapItem) Inc() {
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l.handleCount++
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}
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// Decrement the handle count
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func (l *LockMapItem) Dec() {
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l.handleCount--
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}
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// Get the current handle count
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func (l *LockMapItem) Count() uint32 {
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return l.handleCount
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}
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// Set the download time of the file
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func (l *LockMapItem) SetDownloadTime() {
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l.downloadTime = time.Now()
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}
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// Get the download time of the file
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func (l *LockMapItem) DownloadTime() time.Time {
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return l.downloadTime
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}
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