Asynchronous I/O in PHP

IPC Spring 2013IPC Spring 2013
Asynchronous I/O in PHP

About MeAbout Me
● Thomas Weinert
● papaya Software GmbH
● papaya CMS
● @ThomasWeinert
● http://www.a-basketful-of-papayas.net

Synchronous I/OSynchronous I/O
● Request resource 1
● Wait for resource 1
● Use resource 1
● Wait for resource 2
● Use resource 2

Asynchronous I/OAsynchronous I/O
● Define usage of resource 1
● Request Resource 2
● Define usage of resource 2
● Wait for resource 1 and 2 are used

Event LoopEvent Loop
Listeners
Loop
External
Process
External
Process
File

Browser / JavascriptBrowser / Javascript
<html>
<head><title>Loop</title></head>
<body>
<div id="output"></div>
<script type="text/javascript">
var e = document.getElementById('output');
var counter = 0;
var interval = window.setInterval(
function() {
e.textContent = e.textContent +
counter.toString() + ', ';
counter++;
},
1000
);
</script>
</body>
</html>

PHPPHP
<?php
include('../src/Carica/Io/Loader.php');
CaricaIoLoader::register();
use CaricaIoEventLoop;
$loop = LoopFactory::get();
$i = 0;
$loop->setInterval(
function () use (&$i) {
echo $i++;
},
1000
);
$loop->run();

LibrariesLibraries
● Carica Io
● https://bitbucket.org/ThomasWeinert/carica-io
● ReactPHP
● http://reactphp.org/
● LibEvent (ext/libevent)

Event EmitterEvent Emitter
Object
Event
Callback
Callback
Event
Callback
Event Event
● Attach
● on(), once()
● Trigger
● emit()

Event Emitter ExampleEvent Emitter Example
<?php
include('../../src/Carica/Io/Loader.php');
$server = new CaricaIoNetworkServer();
$server->events()->on(
'connection',
function ($stream) {
...
}
);
$server->listen(8080);
CaricaIoEventLoopFactory::run();

CallbacksCallbacks
● list of handlers for one event
$foo = new stdClass();
$foo->literal = '';
$callbacks = new CaricaIoCallbacks();
$callbacks
->add(
function () use ($foo) {
$foo->literal .= 'Hello ';
}
)
->add(
function () use ($foo) {
$foo->literal .= 'World!';
}
);
$callbacks();
echo $foo->literal;

Deferred/PromiseDeferred/Promise
● „An object that acts as a proxy for a result that is initially unknown, usually
because the computation of its value is yet incomplete.“ (Wikipedia)
● http://domenic.me/2012/10/14/youre-missing-the-point-of-promises/
● jQuery $.Deferred
● ReactPHP/Promise
● https://github.com/reactphp/promise/
● CaricaIoPromise

jQueryjQuery
<html>
<head><title>Promise</title></head>
<body>
<div id="output"></div>
<script
type="text/javascript"
src="http://code.jquery.com/jquery-1.9.1.js">
</script>
<script type="text/javascript">
jQuery(
function () {
jQuery
.get('hello-world.xml')
.done(
function (xml) {
$('#output').text(
$('data', xml).text()
);
}
);
}
);
</script>
</body>
</html>

MethodsMethods
● Deferred/Promise
● done()
● fail()
● always()
● progress()
● state()
● ...

State ChangeState Change
● Deferred
● reject()
● resolve()
● notify

ChainingChaining
● Deferred::when()->then()
● All resolved => done()
● First failed => fail()

MySQL PreparationMySQL Preparation
<?php
include('../../src/Carica/Io/Loader.php');
use CaricaIo;
$mysqlOne = new IoDeferredMySQL(new mysqli('localhost'));
$mysqlTwo = new IoDeferredMySQL(new mysqli('localhost'));
$time = microtime(TRUE);
...

MySQLMySQL
...
$queries = IoDeferred::When(
$mysqlOne("SELECT 'Query 1', SLEEP(5)")
->done(
function($result) use ($time) {
var_dump(iterator_to_array($result));
var_dump(microtime(TRUE) - $time);
}
),
$mysqlTwo("SELECT 'Query 2', SLEEP(1)")
->done(
function($result) use ($time) {
var_dump(iterator_to_array($result));
var_dump(microtime(TRUE) - $time);
}
)
);
$loop = IoEventLoopFactory::get();
IoEventLoopFactory::run($queries);

Carica FirmataCarica Firmata
● Serial Port Communication
● https://bitbucket.org/ThomasWeinert/carica-
firmata

Arduino DemosArduino Demos
● Blink
● Dimmer
● Rest
● Color Wheel

Asynchronous I/O in PHP

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