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<?php
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namespace com;
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use think\Cache;
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/**
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* 伪队列,(用于导入导出轮询时排队)
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*
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* @author Ymob
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* @date 2019-09-30
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*/
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class PseudoQueue
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{
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/**
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* 队列名称
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*
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* @var string
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*/
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protected $name = '';
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/**
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* 队列最大数量,默认0,不限数量
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*
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* @var int
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*/
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protected $max = 0;
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/**
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* 最大可执行数
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*
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* @var int
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*/
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protected $max_exec = 0;
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/**
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* 队列任务请求最大间隔时间,单位秒 默认600秒
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*
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* *考虑网络波动等原因不建议小于 10 秒*
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*
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* @var int
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*/
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protected $overtime = 600;
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/**
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* 队列
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*
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* @var array
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*/
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protected $queue = [];
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/**
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* 当前任务ID
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*
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* @var string
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*/
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public $task_id = '';
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/**
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* 错误信息
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*
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* @var string
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*/
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public $error = '';
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/**
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* 构造函数
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*
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* @param string $name 队列名称
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* @param int $max_exec 最大可执行数
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*/
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public function __construct($name, $max_exec)
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{
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$this->name = 'QUEUE_' . $name;
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$this->max_exec = $max_exec;
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$this->queue = Cache::get($this->name) ?: [];
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}
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/**
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* 设置当前任务ID
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*
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* @param string $task_id 队列索引
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* @return bool
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*/
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public function setTaskId($task_id)
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{
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$index = $this->getIndex($task_id);
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if ($index === false) {
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return false;
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}
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$this->task_id = $task_id;
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return true;
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}
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/**
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* 设置队列最大长度
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*
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* @param int $max
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* @return void
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*/
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public function setMax(int $max)
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{
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$this->max = $max;
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}
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/**
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* 队列最大长度
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*
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* @return int
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*/
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public function getMax()
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{
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return $this->max;
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}
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/**
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* 设置队列任务请求最大间隔时间 (单位:秒s)
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*
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* @param int $overtime
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* @return void
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*/
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public function setOvertime(int $overtime)
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{
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$this->overtime = $overtime;
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}
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/**
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* 读取队列任务请求最大间隔时间
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*
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* @return int
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*/
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public function getOvertime()
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{
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return $this->overtime;
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}
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/**
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* 生成任务ID,并加入队列
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*
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* @return string
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*/
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public function makeTaskId()
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{
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do {
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$task_id = md5(time() . rand(100, 999));
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} while (in_array($task_id, array_column($this->queue, 'task_id')));
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if (!$this->enqueue($task_id)) {
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return false;
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}
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$this->task_id = $task_id;
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return $task_id;
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}
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/**
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* 入队
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*
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* @param string $$this->queue 任务ID
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* @return bool
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*/
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public function enqueue($task_id)
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{
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if ($this->max > 0) {
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if (count($this->queue) >= $this->max) {
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$this->error = '队列长度达到上限';
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return false;
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}
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}
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$this->queue[] = [
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'task_id' => $task_id,
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// 上次处理时间
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'last_processing_time' => time(),
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];
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Cache::set($this->name, $this->queue);
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return true;
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}
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/**
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* 出队
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*
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* @param string $task_id 任务ID,默认当前任务ID
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* @return bool
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*/
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public function dequeue($task_id = null)
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{
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$task_id = $task_id ?: $this->task_id;
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$index = $this->getIndex($task_id);
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if ($index === false) {
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return false;
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}
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unset($this->queue[$index]);
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$this->queue = array_values($this->queue);
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Cache::set($this->name, $this->queue);
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return true;
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}
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/**
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* 当前任务是否可执行
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*
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* @param string $task_id 任务ID,默认当前任务ID
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* @return bool
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*/
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public function canExec($task_id = null)
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{
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$task_id = $task_id ?: $this->task_id;
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$index = $this->getIndex($task_id);
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if ($index === false) {
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return false;
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}
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$res = false;
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for ($i = 0; $i < $this->max_exec; $i++) {
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if (!isset($this->queue[$i])) {
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break;
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}
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// 判断任务处理是否超时
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$temp_time = $this->queue[$i]['last_processing_time'] + $this->overtime;
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if (time() > $temp_time) {
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$this->dequeue($this->queue[$i]['task_id']);
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$i--;
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$index--;
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continue;
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}
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if ($index == $i) {
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$res = true;
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$this->queue[$i]['last_processing_time'] = time();
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Cache::set($this->name, $this->queue);
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break;
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}
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}
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if (!$res) {
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$this->error = '服务器繁忙,排队中...' . ($index - $this->max_exec);
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}
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return $res;
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}
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/**
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* 获取 [当前] 任务所在队列索引
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*
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* @param string $task_id 任务ID,默认当前任务ID
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* @return mixed bool | int
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*/
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public function getIndex($task_id = null)
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{
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$task_id = $task_id ?: $this->task_id;
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$index = array_search($task_id, array_column($this->queue, 'task_id'));
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if ($index === false) {
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$this->error = '队列中不存在该任务';
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}
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return $index;
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}
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/**
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*
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*/
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/**
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* 任务缓存数据
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*
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* @param string $key 缓存键
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* @param mixed $val 缓存值,不传改参数为获取值
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* @return mixed|void
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* @author Ymob
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* @datetime 2019-10-22 13:52:19
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*/
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public function cache($key, $val = null)
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{
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if (!$this->task_id) {
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$this->error = '任务ID不存在';
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return false;
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}
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$index = $this->getIndex($this->task_id);
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if ($val === null) {
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return $this->queue[$index]['cache'][$key];
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} else {
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$this->queue[$index]['cache'][$key] = $val;
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Cache::set($this->name, $this->queue);
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}
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}
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}
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