In-memory List

In-memory List easily allows you to create and save your lists in memory.

If you are looking for a caching system for your lists this library is suitable for you.

Grab your lists from your API, your database or whatever you want and store them in memory: then, you can quickly retrieve your lists from cache, sorting and performing queries on them.

This package uses:

• Apcu
• Memcached
• Pdo
• Redis

Basic Usage

To create and store in memory you list do the following:

use InMemoryList\Application\Client;

$array = [
    ...
]

$client = new Client();
$collection = $client->create($array);

foreach ($collection as $element){
    // ...
}

Drivers

Avaliable drivers:

• apcu
• memcached
• pdo
• redis (default driver)

use InMemoryList\Application\Client;

// Apcu, no configuration is needed
$client = new Client('apcu');
// ..

use InMemoryList\Application\Client;

// Memcached, you can pass one or more servers
$memcached_parameters = [
    [
        'host' => 'localhost',
        'port' => 11211
    ],
    [
        'host' => 'localhost',
        'port' => 11222
    ],
    // etc..
];

$client = new Client('memcached', $memcached_parameters);
// ..

use InMemoryList\Application\Client;

// Pdo
$pdo_parameters = [
    'driver' => 'mysql',
    'host' => '127.0.0.1',
    'username' => 'root',
    'password' => '',
    'database' => 'in-memory-list'
    'port' => '3306'
];

$client = new Client('pdo', $pdo_parameters);
// ..

use InMemoryList\Application\Client;

// you have to use arrays
// you can't use URI string like 'tcp://10.0.0.1:6379'
// please refer to PRedis library documentation
$redis_parameters = [
    'scheme' => 'tcp',
    'host' => '127.0.0.1',
    'port' => 6379,
    'options' => [
        'profile' => '3.0',
    ],
];

$client = new Client('redis', $redis_parameters);
// ..

Refer to official page for more details on PRedis connection.

Parameters

When use create method to a generate a list, you can provide to it a parameters array. The allowed keys are:

• uuid - uuid of list
• element-uuid - uuid for the list elements
• headers - headers array for the list
• chunk-size - the chunks size in which the array will be splitted (integer) **
• ttl - time to live of the list (in seconds) **

** = NOT AVALIABLE WITH PDO DRIVER

uuid

You can assign an uuid to your list (instead, a uuid will be generated):

use InMemoryList\Application\Client;

$array = [
    ...
]

$client = new Client();
$client->create($array, [
    'uuid' => 'simple-array'
]);

// And now you can retrive the list:
$simpleArray = $client->getRepository()->findListByUuid('simple-array');

//..

headers

You can set a headers array to your list:

use InMemoryList\Application\Client;

$array = [
    ...
]

$headers = [
    'expires' => 'Sat, 26 Jul 1997 05:00:00 GMT',
    'hash' => 'ec457d0a974c48d5685a7efa03d137dc8bbde7e3'
];

$client = new Client();
$collection = $client->create($array, [
    'uuid' => 'simple-array',
    'headers' => $headers
]);

// get headers
var_dump($client->getRepository()->getHeaders('simple-array'));

// ...

element-uuid

You can assign an uuid to list elemens (instead, a uuid will be generated). Consider this array:

$simpleArray = [
    [
        "userId" => 1,
        "id" => 1,
        "title" => "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
        "body" =>  "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
    ],
    ...
]

Maybe you would use id key as uuid in your list:

use InMemoryList\Application\Client;

$client = new Client();
$collection = $client->create($simpleArray, [
    'uuid' => 'simple-array',
    'element-uuid' => 'id'
]);

// now to retrieve a single element, you can simply do:
$itemWithId1 = $collection[1];

chunk-size

You can specify the number of elements of each chunk in which the original array will be splitted. The default value is 1000.

use InMemoryList\Application\Client;

$client = new Client();
$collection = $client->create($array, [
    'uuid' => 'simple-array',
    'element-uuid' => 'id',
    'chunk-size' => 1500
]);

// ..

PLEASE NOTE THAT chunk-size IS NOT AVALIABLE WITH PDO DRIVER

ttl

You can specify a ttl (in seconds) for your lists:

use InMemoryList\Application\Client;

$client = new Client();
$collection = $client->create($array, [
    'uuid' => 'simple-array',
    'element-uuid' => 'id',
    'ttl' => 3600
]);

// ..

PLEASE NOTE THAT ttl IS NOT AVALIABLE WITH PDO DRIVER

Delete an element

To delete an element in you list do this:

// ..
$client->getRepository()->deleteElement(
    $listUuid, 
    $elementUuid,
);

Push an element

To push an element in you list, use pushElement function. You must provide the list uuid, the element uuid and element data (data must be consistent - see Validation). Look at this example:

// ..
$client->pushElement(
    'fake-list-uuid',
    5001,
    [
        'id' => 5001,
        'name' => 'Name 5001',
        'email' => 'Email 5001',
    ]
);

Update an element

To update an element in you list, use updateElement function. You must provide the list uuid, the element uuid and element data (data must be consistent - see Validation). Look at this example:

// ..
$client->getRepository()->updateElement(
    'list-to-update', 
    4325, 
    [
        'id' => 4325,
        'title' => 'New Title',
        // ..
    ]
);

Ttl

You can update ttl of a persisted list with updateTtl method, and retrive the ttl with getTtl function:

// ...
$client->getRepository()->updateTtl(
    'your-list-uuid',
    3600 // ttl in seconds
);

// get Ttl of the list
$client->getRepository()->getTtl('your-list-uuid'); // 3600

PLEASE NOTE THAT ttl IS NOT AVALIABLE WITH PDO DRIVER

Validation (Data consistency)

Please note that your data must be consistent:

// simple string list
$stringArray = [
    'Lorem Ipsum',
    'Ipse Dixit',
    'Dolor facium',
];

$collection = $client->create($stringArray, [
    'uuid' => 'string-array',
    'ttl' => 3600
]);

// array list, you must provide elements with consistent structure
$listArray[] = [
    'id' => 1,
    'title' => 'Lorem Ipsum',
];
$listArray[] = [
    'id' => 2,
    'title' => 'Ipse Dixit',
];
$listArray[] = [
    'id' => 3,
    'title' => 'Dolor facium',
];

$collection = $client->create($listArray, [
    'uuid' => 'simple-array',
    'element-uuid' => 'id',
    'ttl' => 3600
]);

// entity list, the objects must have the same properties 
$entityArray[] = new User(1, 'Mauro');
$entityArray[] = new User(2, 'Cristina');
$entityArray[] = new User(3, 'Lilli');

$collection = $client->create($entityArray, [
    'uuid' => 'entity-array',
    'element-uuid' => 'id',
    'ttl' => 3600
]);

Instead, a ListElementNotConsistentException will be thrown. Example:

// ListElementNotConsistentException will be thrown
$listArray[] = [
    'id' => 1,
    'title' => 'Lorem Ipsum',
];
$listArray[] = [
    'id' => 2,
    'non-consistent-key' => 'Ipse Dixit',
];
$listArray[] = [
    'id' => 3,
    'title' => 'Dolor facium',
];

$collection = $client->create($listArray, [
    'uuid' => 'simple-array',
    'element-uuid' => 'id',
    'ttl' => 3600
]);

Sorting and Quering

You can perform queries on your list. This library uses Array Query, please refer to it for the official documentation.

use ArrayQuery\QueryBuilder;

// ..

$list = $client->getRepository()->findListByUuid('simple-array');

$qb = QueryBuilder::create($list);
$qb
    ->addCriterion('id', '3', '>')
    ->sortedBy('id', 'DESC');
  
// get results    
foreach ($qb->getResults() as $element){
    // ...
}

Commands

If you have an application which uses Symfony Console, you have some commands avaliable:

• iml:cache:flush to flush the cache
• iml:cache:index [<from>] [<to>] to get full index of items stored in cache
• iml:cache:schema:create Create database schema (only for PDO driver)
• iml:cache:schema:destroy Destroys database schema (only for PDO driver)
• iml:cache:statistics to get cache statistics

You can register the commands in your app, consider this example:

#!/usr/bin/env php

<?php
// Example of a Silex Application 'bin/console' file
// we use \Knp\Provider\ConsoleServiceProvider as ConsoleServiceProvider, use what you want

set_time_limit(0);

require __DIR__.'/../vendor/autoload.php';

$app = new Silex\Application();
$app->register(new \Knp\Provider\ConsoleServiceProvider(), array(
    'console.name'              => '...',
    'console.version'           => '...',
    'console.project_directory' => __DIR__.'/..'
));

$console = $app['console'];

// add commands here
...
$console->add(new \InMemoryList\Command\CreateSchemaCommand(...));
$console->add(new \InMemoryList\Command\DestroySchemaCommand(...));
$console->add(new \InMemoryList\Command\FlushCommand(...));
$console->add(new \InMemoryList\Command\IndexCommand(...));
$console->add(new \InMemoryList\Command\StatisticsCommand(...));
$console->run();

You have to provide to commands your driver and connection parameters array. Example:

$console->add(new \InMemoryList\Command\FlushCommand('redis', [
    'host' => '127.0.0.1',
    'port' => 6379,
]));

Testing

In order to run all the tests, you have two options:

1. Install all the drivers on your machine

The first way it to install all the drivers on your machine:

• APCU - (install via PECL)
• MEMCACHED - (install via PECL)
• REDIS - (official install guide)

Once installed all the drivers, create a file called config/parameters.yml and paste in the content of config/parameters.dist.yml. Finally, change your configuration if needed:

redis_parameters:
  scheme: 'tcp'
  host: '127.0.0.1'
  port: '6379'
  options:
    profile: '3.2'

memcached_parameters:
  host: 'localhost'
  port: '11211'

pdo_parameters:
  driver: 'mysql'
  host: '127.0.0.1'
  username: 'root'
  password: ~
  database: 'in-memory-list'
  port: '3306'
  options: ~  

2. Run the project with Docker

You can run the project with Docker.

STEP1: Make the build

docker-compose build

STEP2: Raise the app

docker-compose up -d

STEP3: Enter in the docker container

docker exec -it inmemorylist_app_1 bash

STEP4: Create the schema and run the tests in the container

php bin/console iml:cache:schema:create

vendor/bin/phpunit

Built With

• PRedis - Flexible and feature-complete Redis client for PHP and HHVM
• ramsey/uuid - A PHP 5.4+ library for generating RFC 4122 version 1, 3, 4, and 5 universally unique identifiers (UUID).
• Symfony Console - Symfony Console Component

Support

If you found an issue or had an idea please refer to this section.

Authors

• Mauro Cassani - github

License

This project is licensed under the MIT License - see the LICENSE.md file for details