Doctrine In The Real World sflive2011 Paris

doctrine
Doctrine in the Real World
Real world examples

Friday, March 4, 2011

My name is
Jonathan H. Wage


• PHP Developer for 10+ years
• Long time Symfony and Doctrine
contributor

• Published Author
• Entrepreneur
• Currently living in Nashville, Tennessee


Previously employed by
SensioLabs


http://mongodbhosting.com

Partnered with
ServerGrove
MongoDB Hosting


Today, I work full-time
for OpenSky
http://shopopensky.com


What is OpenSky?


A new way to shop

• OpenSky connects you with innovators,
trendsetters and tastemakers.You choose
the ones you like and each week they invite
you to their private online sales.


OpenSky Loves
OpenSource
• PHP 5.3

• Apache2

• Symfony2

• Doctrine2

• jQuery

• mule, stomp, hornetq

• MongoDB

• nginx

• varnish


We don’t just use open
source projects


We help build them


OpenSky has some of
the top committers in
Symfony2 and other
projects


Symfony2 OpenSky
Committers
• 65 Kris Wallsmith

• 52 Jonathan H. Wage

• 36 Jeremy Mikola

• 36 Bulat Shakirzyanov

•6 Justin Hileman


Doctrine MongoDB
Committers




MongoDB ODM
Committers



• 13 Steven Surowiec

• 2 Jeremy Mikola


OpenSky uses both the
Doctrine ORM and ODM


We are an eCommerce
site


Actions involving
commerce need
transactions


ORM and MySQL

• Order
• OrderTransaction
• OrderShipment


ODM and MongoDB
• Product
• Seller
• Supplier
• User
• ... basically everything else that is not
involving $$$ and transactions


Blending the Two


Deﬁning our Product
Document


/** @mongodb:Document(collection="products") */
class Product
{
/** @mongodb:Id */
private $id;

/** @mongodb:String */
private $title;

public function getId()
{
return $this->id;
}

public function getTitle()
{
return $this->title;
}

public function setTitle($title)
{
$this->title = $title;
}
}


Deﬁning our Order
Entity


/**
* @orm:Entity
* @orm:Table(name="orders")
* @orm:HasLifecycleCallbacks
*/
class Order
{
/**
* @orm:Id @orm:Column(type="integer")
* @orm:GeneratedValue(strategy="AUTO")
*/
private $id;

/**
* @orm:Column(type="string")
*/
private $productId;

/**
* @var DocumentsProduct
*/
private $product;

// ...
}


Setting the Product

public function setProduct(Product $product)
{
$this->productId = $product->getId();
$this->product = $product;
}


• $productId is mapped and persisted
• but $product which stores the Product
instance is not a persistent entity property


Order has a reference
to product?

• How?
• Order is an ORM entity stored in MySQL
• and Product is an ODM document stored
in MongoDB


Loading Product ODM
reference in Order
Entity


Lifecycle Events to the
Rescue


EventManager

• Event system is controlled by the EventManager
• Central point of event listener system
• Listeners are registered on the manager
• Events are dispatched through the manager


Add EventListener

$eventListener = new OrderPostLoadListener($dm);
$eventManager = $em->getEventManager();
$eventManager->addEventListener(
array(DoctrineORMEvents::postLoad), $eventListener
);


In Symfony2 DI
<?xml version="1.0" encoding="utf-8" ?>
<container xmlns="http://www.symfony-project.org/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.symfony-project.org/schema/dic/services http://www.symfony-project.org/
schema/dic/services/services-1.0.xsd">

<parameters>
<parameter key="order.post_load.listener.class">OrderPostLoadListener</parameter>
</parameters>

<services>
<service id="order.post_load.listener" class="%order.post_load.listener.class%" scope="container">
<argument type="service" id="doctrine.odm.mongodb.default_document_manager" />
<tag name="doctrine.orm.default_event_listener" event="postLoad" />
</service>
</services>
</container>


OrderPostLoadListener
use DoctrineODMMongoDBDocumentManager;
use DoctrineORMEventLifecycleEventArgs;

class OrderPostLoadListener
{
public function __construct(DocumentManager $dm)
{
$this->dm = $dm;
}

public function postLoad(LifecycleEventArgs $eventArgs)
{
// get the order entity
$order = $eventArgs->getEntity();

// get odm reference to order.product_id
$productId = $order->getProductId();
$product = $this->dm->getReference('MyBundle:DocumentProduct', $productId);

// set the product on the order
$em = $eventArgs->getEntityManager();
$productReflProp = $em->getClassMetadata('MyBundle:EntityOrder')
->reflClass->getProperty('product');
$productReflProp->setAccessible(true);
$productReflProp->setValue($order, $product);
}
}


All Together Now
// Create a new product and order
$product = new Product();
$product->setTitle('Test Product');
$dm->persist($product);
$dm->flush();

$order = new Order();
$order->setProduct($product);
$em->persist($order);
$em->flush();

// Find the order later
$order = $em->find('Order', $order->getId());

// Instance of an uninitialized product proxy
$product = $order->getProduct();

// Initializes proxy and queries the monogodb database
echo "Order Title: " . $product->getTitle();
print_r($order);


Seamless

• Documents and Entities play together like
best friends
• Because Doctrine persistence remains
transparent from your domain this is
possible


print_r($order)
Order Object
(
[id:EntitiesOrder:private] => 53
[productId:EntitiesOrder:private] => 4c74a1868ead0ed7a9000000
[product:EntitiesOrder:private] => ProxiesDocumentProductProxy Object
(
[__isInitialized__] => 1
[id:DocumentsProduct:private] => 4c74a1868ead0ed7a9000000
[title:DocumentsProduct:private] => Test Product
)

)


Example from Blog

• This example was ﬁrst written on my
personal blog http://jwage.com

• You can read the blog post here http://
jwage.com/2010/08/25/blending-the-
doctrine-orm-and-mongodb-odm/


MongoDB ODM
SoftDelete Functionality


I like my deletes soft,
not hard


Deleting data is
dangerous business


Flickr accidentally
deleted a pro members
account and 5000
pictures


They were able to
restore it later but it
took some time


Instead of deleting, simply
set a deletedAt ﬁeld


Install SoftDelete
Extension for Doctrine
MongoDB ODM
http://github.com/doctrine/mongodb-odm-softdelete

$ git clone git://github.com/doctrine/mongodb-odm-softdelete src/
vendor/doctrine-mongodb-odm-softdelete


Autoload Extension
$loader = new UniversalClassLoader();
$loader->registerNamespaces(array(
// ...
'DoctrineODMMongoDBSoftDelete' => __DIR__.'/vendor/doctrine-mongodb-odm-
softdelete/lib',
));
$loader->register();


Raw PHP Conﬁguration

use DoctrineODMMongoDBSoftDeleteUnitOfWork;
use DoctrineODMMongoDBSoftDeleteSoftDeleteManager;
use DoctrineCommonEventManager;

// $dm is a DocumentManager instance we should already have
use DoctrineODMMongoDBSoftDeleteConfiguration;

$config = new Configuration();
$uow = new UnitOfWork($dm, $config);
$evm = new EventManager();
$sdm = new SoftDeleteManager($dm, $config, $uow, $evm);


Symfony2 Integration
http://github.com/doctrine/mongodb-odm-softdelete-bundle

$ git clone git://github.com/doctrine/mongodb-odm-softdelete-bundle.git
src/vendor/doctrine-mongodb-odm-softdelete-bundle


Autoload the Bundle

$loader = new UniversalClassLoader();
$loader->registerNamespaces(array(
// ...
'DoctrineODMMongoDBSymfonySoftDeleteBundle' => __DIR__.'/vendor/doctrine-
mongodb-odm-softdelete-bundle',
));
$loader->register();


Register the Bundle
public function registerBundles()
{
$bundles = array(
// ...

// register doctrine symfony bundles
new DoctrineODMMongoDBSymfonySoftDeleteBundleSoftDeleteBundle()
);

// ...

return $bundles;
}


Enable the Bundle

// app/config/config.yml

doctrine_mongodb_softdelete.config: ~


SoftDeleteManager

$sdm = $container->get('doctrine.odm.mongodb.soft_delete.manager');


SoftDeleteable
ODM Documents must implement this interface

interface SoftDeleteable
{
function getDeletedAt();
}


User implements
SoftDeletable
/** @mongodb:Document */
class User implements SoftDeleteable
{
/** @mongodb:Date @mongodb:Index */
private $deletedAt;

public function getDeletedAt()
{
return $this->deletedAt;
}
}


SoftDelete a User
$user = new User('jwage');
// ...
$dm->persist($user);
$dm->flush();

// later we can soft delete the user jwage
$user = $dm->getRepository('User')->findOneByUsername('jwage');
$sdm->delete($user);
$sdm->flush();


Query Executed
db.users.update(
{
_id : {
$in : [new ObjectId('1234567891011123456')]
}
},
{
$set : {
deletedAt: new Date()
}
}
)


Restore a User

// now again later we can restore that same user
$user = $dm->getRepository('User')->findOneByUsername('jwage');
$sdm->restore($user);
$sdm->flush();


Query Executed
db.users.update(
{
_id : {
$in : [new ObjectId('1234567891011123456')]
}
},
{
$unset : {
deletedAt: true
}
}
)


Limit cursors to only
show non deleted users

$qb = $dm->createQueryBuilder('User')
->field('deletedAt')->exists(false);
$query = $qb->getQuery();
$users = $query->execute();


Get only deleted users

->field('deletedAt')->exists(true);


Restore several deleted
users
->field('deletedAt')->exists(true)
->field('createdAt')->gt(new DateTime('-24 hours'));

foreach ($users as $user) {
$sdm->restore($user);
}
$sdm->flush();


Soft Delete Events

class TestEventSubscriber implements DoctrineCommonEventSubscriber
{
public function preSoftDelete(LifecycleEventArgs $args)
{
$document = $args->getDocument();
- preDelete }
$sdm = $args->getSoftDeleteManager();

- postDelete public function getSubscribedEvents()
{
- preRestore }
return array(Events::preSoftDelete);

- postRestore }

$eventSubscriber = new TestEventSubscriber();
$evm->addEventSubscriber($eventSubscriber);


PHP Daemons


Symfony2 and
supervisor
http://supervisord.org/


What is supervisor?


Supervisor is a client/server system
that allows its users to monitor and
control a number of processes on
UNIX-like operating systems.

http://supervisord.org


Daemonize a Symfony2
Console Command
with supervisor


Scenario

• You want to send an e-mail when new
users register in your system.
• But, sending an e-mail directly from your
action introduces a failure point to your
stack.
• ....What do you do?


Tailable Cursor
• Use a tailable mongodb cursor
• Tail a NewUser document collection
• Insert NewUser documents from your
actions
• The daemon will instantly process the
NewUser after it is inserted and dispatch
the e-mail


Deﬁne NewUser
namespace MyCompanyBundleMyBundleDocument;

/**
* @mongodb:Document(collection={
* "name"="new_users",
* "capped"="true",
* "size"="100000",
* "max"="1000"
* }, repositoryClass="MyCompanyBundleMyBundleDocumentNewUserRepository")
*/
class NewUser
{
/** @mongodb:Id */
private $id;

/** @mongodb:ReferenceOne(targetDocument="User") */
private $user;

/** @mongodb:Boolean @mongodb:Index */
private $isProcessed = false;

// ...
}


Create Collection
• The NewUser collection must be capped in
order to tail it so we need to create it.
• Luckily, Doctrine has a console command
for it.
• It will read the mapping information we
conﬁgured and create the collection

$ php app/console doctrine:mongodb:schema:create --class="MyBundle:NewUser" --collection


Insert NewUser upon
Registration
public function register()
{
// ...

$user = new User();
$form = new RegisterForm('register', $user, $validator);

$form->bind($request, $user);
if ($form->isValid()) {
$newUser = new NewUser($user);
$dm->persist($newUser);
$dm->persist($user);
$dm->flush();

// ...
}
// ...
}


Executing Console
Command
$ php app/console doctrine:mongodb:tail-cursor MyBundle:NewUser findUnProcessed
new_user.processor

• The command requires 3 arguments:

• document - the name of the document to tail

• finder - the repository finder method used to get the cursor

• processor - the id of the service used to process the new
users


ﬁndUnProcessed()

• We need the ﬁndUnProcessed() method to
class NewUserRepository extends DocumentRepository
{
return the unprocessed cursor to tail
public function findUnProcessed()
{
return $this->createQueryBuilder()
->field('isProcessed')->equals(false)
->getQuery()
->execute();
}
}


NewUserProcessor
We need a service id new_user.processor with a
process(OutputInterface $output, $document) method
use Swift_Message;
use SymfonyComponentConsoleOutputOutputInterface;

class NewUserProcessor
{
private $mailer;

public function __construct($mailer)
{
$this->mailer = $mailer;
}

public function process(OutputInterface $output, $document)
{
}
}


Send the e-mail
public function process(OutputInterface $output, $document)
{
$user = $document->getUser();

$message = Swift_Message::newInstance()
->setSubject('New Registration')
->setFrom('noreply@domain.com')
->setTo($user->getEmail())
->setBody('New user registration')
;
$this->mailer->send($message);

$document->setIsProcessed(true);
}


Tailable Cursor Bundle

https://github.com/doctrine/doctrine-mongodb-odm-
tailable-cursor-bundle


Daemonization
• Now, how do we really daemonize the
console command and keep it running 24
hours a day, 7 days a week?

• The answer is supervisor, it will allow us to
conﬁgure a console command for it to
manage the process id of and always keep
an instance of it running.


Install supervisor
http://supervisord.org/installing.html

$ easy_install supervisor


Configure a Profile
• We need to configure a profile for supervisor to
know how to run the console command
/
$ vi /etc/supervisor/conf.d/tail-new-user.conf
r
[program:tail-new-user]
numprocs=1
startretries=100
directory=/
stdout_logfile=/path/to/symfonyproject/app/logs/tail-new-user-supervisord.log
autostart=true
autorestart=true
user=root
command=/usr/local/bin/php /path/to/symfonyproject/app/console
doctrine:mongodb:tail-cursor MyBundle:NewUser findUnprocessed
new_user.processor

Start supervisord
• Start an instance of supervisord
• It will run as a daemon in the background
• The tail-new-user.conf will always be
running

$ supervisord


Where do I use
supervisor?
• http://sociallynotable.com
• Keeps daemon running that watches
twitter
• Indexes tweets with links to amazon
products
• Maintains tweet statistics and ranks the
popular products


Thanks!
I hope this presentation was useful to you!


Questions?
- http://jwage.com
- http://twitter.com/jwage
- http://facebook.com/jwage
- http://about.me/jwage
- http://shopopensky.com
- http://mongodbhosting.com
- http://servergrove.com
- http://sociallynotable.com


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