- 原文:https://designpatternsphp.readthedocs.io/zh_CN/latest/Creational/Pool/README.html
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1 <?PHP 2 3 namespace Design\Patterns\Creational\Pool; 4 5 use Countable; 6 7 8 class WorkerPool implements Countable 9 { 10 /** 11 * @var StringReverseWorker[] 12 */ 13 private $occupiedWorkers = []; 14 15 /** 16 * @var StringReverseWorker[] 17 */ 18 private $freeWorkers = []; 19 20 public function get(): StringReverseWorker 21 { 22 if (count($this->freeWorkers) == 0) { 23 $worker = new StringReverseWorker(); 24 } else { 25 $worker = array_pop($this->freeWorkers); 26 } 27 28 $this->occupiedWorkers[spl_object_hash($worker)] = $worker; 29 30 return $worker; 31 } 32 33 public function dispose(StringReverseWorker $worker) 34 { 35 $key = spl_object_hash($worker); 36 37 if (isset($this->occupiedWorkers[$key])) { 38 unset($this->occupiedWorkers[$key]); 39 $this->freeWorkers[$key] = $worker; 40 } 41 } 42 43 public function count(): int 44 { 45 return count($this->occupiedWorkers) + count($this->freeWorkers); 46 } 47 } 48 49 class StringReverseWorker 50 { 51 private $noncestr; 52 53 public function __construct() 54 { 55 $this->noncestr = time().mt_rand(100,999); 56 } 57 58 public function run(string $text) 59 { 60 return strrev($text); 61 } 62 } 63 64 $pool = new WorkerPool(); 65 $w1 = $pool->get(); 66 $w2 = $pool->get(); 67 68 var_dump($w1); 69 echo "<hr/>"; 70 var_dump($w2); 71 echo "<hr/>"; 72 73 $pool->dispose($w1); 74 $w3 = $pool->get(); 75 var_dump($w3);
测试