public function testStampedeProtection()
{
Coroutine\create(function () {
$cache = new MemoryDriver();
file_put_contents(__DIR__ . "/stampede", 1);
$factory = function () use(&$counter) {
$count = (int) file_get_contents(__DIR__ . "/stampede");
file_put_contents(__DIR__ . "/stampede", ++$count);
(yield $count);
};
$cache->set("counter", $factory);
$cache->set("counter", $factory);
$cache->set("counter", $factory);
$cache->get("counter");
$cache->get("counter");
// resolve the first "counter" value
(yield $cache->get("counter"));
// fetch the second "counter" value from the cache memory store
$actual = (yield $cache->get("counter"));
// first check to see that the count stored in the filesystem
// is correct...
Loop\timer(0.5, function () {
$count = (int) file_get_contents(__DIR__ . "/stampede");
$this->assertEquals(2, $count);
unlink(__DIR__ . "/stampede");
});
// then check to see that the count stored in the cache
// is correct...
$this->assertEqualsAfterDelay(2, $actual);
})->done();
Loop\run();
}
<?php
require "vendor/autoload.php";
use AsyncPHP\Icicle\Cache\Driver\MemoryDriver;
use Icicle\Http\Client\Client;
use Icicle\Http\Message\RequestInterface;
use Icicle\Http\Message\Response;
use Icicle\Http\Server\Server;
use Icicle\Loop;
use Icicle\Socket\SocketInterface;
use Icicle\Stream\MemorySink;
$cache = new MemoryDriver();
$server = new Server(function (RequestInterface $request, SocketInterface $socket) use($cache) {
try {
$cached = (yield $cache->get("foo"));
if (!$cached) {
$cached = (yield $cache->set("foo", function () {
$client = new Client();
/** @var ResponseInterface $response */
$response = (yield $client->request("GET", "https://icicle.io/"));
$data = "";
$stream = $response->getBody();
while ($stream->isReadable()) {
$data .= (yield $stream->read());
}
(yield $data);
}));
}
$stream = new MemorySink();
(yield $stream->end($cached));
$response = new Response(200, ["content-type" => "text/html", "content-length" => $stream->getLength()], $stream);