Pool::idleCount
(PHP 8.6+, True Async 1.0)
public Pool::idleCount(): int
返回空闲（未使用）且可供获取的资源数量。
参数
该方法不接受参数。
返回值
池中空闲资源的数量。
示例
示例 #1 跟踪空闲资源
<?php
use Async\Pool;
$pool = new Pool(
factory: fn() => new PDO('mysql:host=localhost;dbname=app', 'user', 'pass'),
min: 3,
max: 10
);
echo $pool->idleCount() . "\n"; // 3
$conn = $pool->acquire();
echo $pool->idleCount() . "\n"; // 2
$pool->release($conn);
echo $pool->idleCount() . "\n"; // 3
示例 #2 自适应策略
<?php
use Async\Pool;
$pool = new Pool(
factory: fn() => createExpensiveResource(),
min: 1,
max: 20
);
// If few idle resources remain — reduce load
if ($pool->idleCount() < 2 && $pool->count() >= 18) {
echo "Warning: pool is nearly exhausted\n";
}
参见
- Pool::activeCount — 活跃资源的数量
- Pool::count — 资源总数