Asynchronous Awesome Eric Mann 

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Problems this Won’t Solve Report generation PubSub events Parallel I/O Parallel data access 

Naive Approaches to Async Pseudo-cron (WordPress native and tools like wp-async-task) Mechanical Turk-like job systems Using another language entirely 

There’s a Better Way 

Parallel vs Concurrent Concurrent Parallel (not covered today) Concurrent Parallel 

Concurrent and Parallel Programming - Joe Armstrong https://joearms.github.io/published/2013-04-05-concurrent-and-parallel-programming.html 

Tools Available Gearman RabbitMQ Amp (promises) pthreads 

Gearman 

Initialize a Standalone Worker addServer('localhost', 4730); $worker->addFunction('import', array($importer, 'import'); while($worker->work()); 

Dispatch Jobs to the Worker addServer('localhost', 4730); $job = $client->doBackground('import', $file . '|:|' . $email); $db->record($job); 

RabbitMQ 

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Publish to the Queue channel(); $channel->queue_declare('demo', false, false, false, false); $msg = new AMQPMessage('Hello World!'); $channel->basic_publish($msg, '', 'demo'); $channel->close(); $connection->close(); 

Consume from the Queue channel(); $channel->queue_declare('demo', false, false, false, false); $cb = function($msg) { // Send Tweet with $msg contents } $channel->basic_consume('demo', '', false, true, false, false, $cb); while(count($channel->callbacks)) { $channel->wait(); } 

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Interact with Multiple Queues queue_declare('demo', false, false, false, false); $channel->queue_declare('demo-rc', false, false, false, false); $cb = function($msg) { // Send Tweet with $msg contents $result = new AMQPMessage( /* Tweet ID */ ); $channel->basic_publish($result, '', 'demo-rc'); } $channel->basic_consume('demo', '', false, true, false, false, $cb); while(count($channel->callbacks)) { $channel->wait(); } 

Amp (promises) 

Deferred Empowers Async resolve($x * $y); }); return $deferred->promise(); } asyncMultiply(6, 7)->onResolve(function ($err, $result) { var_dump($result); // int(42) }); 

Chain Multiple Promises Together "http://www.google.com", "bing" => "http://www.bing.com", ]; $responses = yield array_map(function ($uri) use ($httpClient) { return $httpClient->request($uri); }, $uris); foreach ($responses as $key => $response) { printf("%s | %d\n", $key, $response->getStatus()); } Loop::stop(); }); 

pthreads 

Create a Worker workerId = $id; } public function run() { // Do some heavy processing } } 

Start the Workers start(); // Now they'll each run independently } foreach (range(0, 5) as $id) { $workers[$id]->join(); // Synchronously rejoin the main process } 

What Use is Any of This? Gearman – powers things like PDF conversion, video transpiling, APNS RabbitMQ – powers cross-app messaging in load balanced environments Promises – power concurrent data migrations for large data sources pthreads – powers task management in a performance, scalable, managed fashion 

Further Study The amphp/parallel library wraps pthreads entirely – use both at the same time! Look at what the Node community is doing – we have the same exact tools available, but a much larger community and lower barriers Challenge yourself to look at traditional programming problems from an asynchronous viewpoint – can things run faster in parallel? 

Questions? 

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