Delay queue is a message queue with delay function. Compared with ordinary queue, it can consume messages at a specified time.
Application scenario of delay queue:
1. New users sign up, and send e-mails or on-site letters in 10 minutes.
2. After the user places an order, the order will be automatically voided if the payment is not made within 30 minutes.
We use the ordered set zset of redis to realize a simple delay queue, serialize the message data as the value of zset, and take the message processing time as the score. Each time we get a message through zRangeByScore for processing.
<?php class DelayQueue { protected $prefix = 'delay_queue:'; protected $redis = null; protected $key = ''; public function __construct($queue, $config = []) { $this->key = $this->prefix . $queue; $this->redis = new Redis(); $this->redis->connect($config['host'], $config['port'], $config['timeout']); $this->redis->auth($config['auth']); } public function delTask($value) { return $this->redis->zRem($this->key, $value); } public function getTask() { //Get the task, take 0 and current time as the interval, and return a record return $this->redis->zRangeByScore($this->key, 0, time(), ['limit' => [0, 1]]); } public function addTask($name, $time, $data) { //Add tasks, with time as the score, and sort the task queue by time from small to large return $this->redis->zAdd( $this->key, $time, json_encode([ 'task_name' => $name, 'task_time' => $time, 'task_params' => $data, ], JSON_UNESCAPED_UNICODE) ); } public function run() { //Take only one task at a time $task = $this->getTask(); if (empty($task)) { return false; } $task = $task[0]; //There is the possibility of concurrency. Here, the zrem return value is used to determine who gets the task if ($this->delTask($task)) { $task = json_decode($task, true); //Processing tasks echo 'Tasks:' . $task['task_name'] . ' Run time:' . date('Y-m-d H:i:s') . PHP_EOL; return true; } return false; } } $dq = new DelayQueue('close_order', [ 'host' => '127.0.0.1', 'port' => 6379, 'auth' => '', 'timeout' => 60, ]); $dq->addTask('close_order_111', time() + 30, ['order_id' => '111']); $dq->addTask('close_order_222', time() + 60, ['order_id' => '222']); $dq->addTask('close_order_333', time() + 90, ['order_id' => '333']);
Then, we write a php script to handle the tasks in the queue.
<?php set_time_limit(0); $dq = new DelayQueue('close_order', [ 'host' => '127.0.0.1', 'port' => 6379, 'auth' => '', 'timeout' => 60, ]); while (true) { $dq->run(); usleep(100000); }
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