在 Laravel 6 中，设置静态变量后，在下一队列任务中获取时未被清除，会被沿用的解决
1、参考：https://www.shuijingwanwq.com/2022/07/15/6796/ 。在 Laravel 6 的队列任务中，当任务失败时的处理(设置与获取静态变量)。但是，其存在一个 Bug，在下一队列任务中如果未被重新设置，则会被沿用。分别打印2个任务中的静态变量：self::$destination。预期 755 的 destination 为 null，但是其沿用了 754 的值。如图1
图1
private static ?string $destination = null; // 解压缩 ZIP 文件后的目录
Log::info(
'destination',
[
'id' => $this->themeInstallationTask->id,
'destination' => self::$destination
]
);
[2023-04-14 13:37:18] local.INFO: uploadThemeAssetToCdn {
"id": 754,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681450622.2291.583840996"
}
[2023-04-14 13:38:06] local.INFO: uploadThemeAssetToCdn {
"id": 755,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681450622.2291.583840996"
}
2、如果在下一个队列任务中，有重新设置 静态变量为 null，则会被覆盖，分别打印2个任务中的静态变量：self::$destination。符合预期。如图2
图2
private static ?string $destination = null; // 解压缩 ZIP 文件后的目录
self::$destination = null;
Log::info(
'uploadThemeAssetToCdn',
[
'id' => $this->themeInstallationTask->id,
'destination' => self::$destination
]
);
[2023-04-14 13:44:46] local.INFO: uploadThemeAssetToCdn {
"id": 756,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681451070.5331.338264899"
}
[2023-04-14 13:45:34] local.INFO: uploadThemeAssetToCdn {
"id": 757,
"destination": null
}
3、但是，参考：在 Laravel 6 中，在队列任务中，重试时的指数回退(exponential backoff)的实现。当想将静态变量传递给下一个队列任务时，仍然会导致相互覆盖的问题。在 handle 方法中，预期 760 的值不为 null ，但是现在已经被 761 的 null 给覆盖。如图3
图3
private static ?string $absolutePath; // 待解压缩的 ZIP 文件的绝对路径
private static ?string $destination; // 解压缩 ZIP 文件后的目录
/**
* Create a new job instance.
*
* @return void
*/
public function __construct(ThemeInstallationTask $themeInstallationTask, ?string $absolutePath, ?string $destination)
{
// 队列任务构造器中接收了 Eloquent 模型，将会只序列化模型的 ID
$this->themeInstallationTask = $themeInstallationTask;
self::$absolutePath = $absolutePath;
self::$destination = $destination;
Log::info(
'construct',
[
'id' => $this->themeInstallationTask->id,
'destination' => self::$destination
]
);
}
/**
* Execute the job.
*
* @return void
* @throws OverflowException
*/
public function handle()
{
Log::info(
'handle',
[
'id' => $this->themeInstallationTask->id,
'destination' => self::$destination
]
);
}
PS E:\wwwroot\object> php artisan queue:work
[2023-04-14 14:06:03][ACuiiTG0Ptuo5Tl3iMCPnREKYZhGTva3] Processing: Jobs\ThemeInstalling
[2023-04-14 14:06:50][ACuiiTG0Ptuo5Tl3iMCPnREKYZhGTva3] Processed: Jobs\ThemeInstalling
[2023-04-14 14:06:50][xcL1KIALWlYy9edrKD3GpqkWOzCbudSu] Processing: Jobs\ThemeInstalling
[2023-04-14 14:07:22][xcL1KIALWlYy9edrKD3GpqkWOzCbudSu] Processed: Jobs\ThemeInstalling
[2023-04-14 14:07:22][Ff7Pcd8szupQYVAO2BkQhGJxyoQKrpo8] Processing: Jobs\ThemeAssetUploading
[2023-04-14 14:07:42][Ff7Pcd8szupQYVAO2BkQhGJxyoQKrpo8] Processed: Jobs\ThemeAssetUploading
[2023-04-14 14:07:42][Nyc3IPP2mXHz3Hl2tT4RADsKNTAhxf1l] Processing: Jobs\ThemeAssetUploading
[2023-04-14 14:07:45][Nyc3IPP2mXHz3Hl2tT4RADsKNTAhxf1l] Processed: Jobs\ThemeAssetUploading
[2023-04-14 14:07:45][gaMvLrJttc4Ws1qu2rAAsORFGAfPNZmq] Processing: Jobs\ThemeInstalled
[2023-04-14 14:07:45][gaMvLrJttc4Ws1qu2rAAsORFGAfPNZmq] Processed: Jobs\ThemeInstalled
[2023-04-14 14:07:45][QALQV7djT9caKVH50HHZLe0x3OScalBP] Processing: Jobs\ThemeInstalled
[2023-04-14 14:07:45][QALQV7djT9caKVH50HHZLe0x3OScalBP] Processed: Jobs\ThemeInstalled
[2023-04-14 14:06:19] local.INFO: uploadThemeAssetToCdn {
"id": 760,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681452363.3555.1473533151"
}
[2023-04-14 14:06:19] local.INFO: construct {
"id": 760,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681452363.3555.1473533151"
}
[2023-04-14 14:06:53] local.INFO: uploadThemeAssetToCdn {
"id": 761,
"destination": null
}
[2023-04-14 14:06:53] local.INFO: construct {
"id": 761,
"destination": null
}
[2023-04-14 14:07:22] local.INFO: handle {
"id": 760,
"destination": null
}
[2023-04-14 14:07:22] local.INFO: destination {
"id": 760,
"destination": null
}
[2023-04-14 14:07:42] local.INFO: destination {
"id": 760,
"destination": null
}
[2023-04-14 14:07:42] local.INFO: handle {
"id": 761,
"destination": null
}
[2023-04-14 14:07:42] local.INFO: destination {
"id": 761,
"destination": null
}
[2023-04-14 14:07:45] local.INFO: destination {
"id": 761,
"destination": null
}
4、最终决定放弃静态变量的使用，将相应的值存储在队列任务相关的 MySQL 表记录中。队列任务之间不再相互影响，符合预期。如图4
图4
{
"theme_download_paths": {
"zip_path": "/theme_downloads/2023/04/17/1681696283.1861.462360447.zip",
"destination": "/theme_downloads/2023/04/17/1681696283.1861.462360447"
}
}
PS E:\wwwroot\object> php artisan queue:work
[2023-04-17 09:51:22][0Ta6TjtzacnMmI50uh9Ti3s9qfh5c5H1] Processing: Jobs\ThemeInstalling
[2023-04-17 09:52:21][0Ta6TjtzacnMmI50uh9Ti3s9qfh5c5H1] Processed: Jobs\ThemeInstalling
[2023-04-17 09:52:21][dcjXRXkV2XgHdhQrGkYy3Yyq9vy7iiDh] Processing: Jobs\ThemeInstalling
[2023-04-17 09:52:59][dcjXRXkV2XgHdhQrGkYy3Yyq9vy7iiDh] Processed: Jobs\ThemeInstalling
[2023-04-17 09:52:59][v8MkfSZlf6PtoXi8tqNcDb4SXCp6KTGk] Processing: Jobs\ThemeAssetUploading
[2023-04-17 09:53:02][v8MkfSZlf6PtoXi8tqNcDb4SXCp6KTGk] Processed: Jobs\ThemeAssetUploading
[2023-04-17 09:53:02][Zv1ts0pDpCSiTVoWc9WqmszXj5QUYSF6] Processing: Jobs\ThemeAssetUploading
[2023-04-17 09:53:07][Zv1ts0pDpCSiTVoWc9WqmszXj5QUYSF6] Processed: Jobs\ThemeAssetUploading
[2023-04-17 09:53:07][K69thLwVkwnkOccdR778hDdMBAL7U4pD] Processing: Jobs\ThemeInstalled
[2023-04-17 09:53:07][K69thLwVkwnkOccdR778hDdMBAL7U4pD] Processed: Jobs\ThemeInstalled
[2023-04-17 09:53:07][SJPEBLJozJygXiIW9zfJNU1FSGtBmWek] Processing: Jobs\ThemeInstalled
[2023-04-17 09:53:07][SJPEBLJozJygXiIW9zfJNU1FSGtBmWek] Processed: Jobs\ThemeInstalled
[2023-04-17 14:02:50] local.INFO: destination {
"id": 799,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/17/1681711238.5778.1671140645"
}
[2023-04-17 14:02:54] local.INFO: destination {
"id": 799,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/17/1681711238.5778.1671140645"
}
[2023-04-17 14:02:56] local.INFO: destination {
"id": 800,
"destination": null
}
[2023-04-17 14:02:57] local.INFO: destination {
"id": 800,
"destination": null
}
[2023-04-17 14:02:57] local.INFO: destination {
"id": 801,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/17/1681711324.896.2108597779"
}
[2023-04-17 14:02:59] local.INFO: destination {
"id": 801,
"destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/17/1681711324.896.2108597779"
}
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