Example of usage:
<?php
// require init.php for autoload classes
require('vendor/autoload.php');
use Hybrid\Cache;
// Use other name for no conflicts with Memcache Class
use Hybrid\Storages\Memcache as MemcacheStorage;
// add a MediaStorage to the Cache class:
Cache::addStorageMedia( new MemcacheStorage('localhost') );
// create a cache instance, with an identifier (can be a lot of values):
$cache = Cache::create(__FILE__, 'list top users');
// check if cache exists and is aviable
$data = $cache->getCacheOr(true, function ($cache) {
// make your heavy processing.... (saving the result in a variable)
return $result;
});
// Or...
if ($data = $cache->getCache(true)) {
// dump cached data
echo $data;
// stop the script (or the method, ect)
exit(0);
} else {
// set the cache status as "saving" (to avoid duplicating entries)
$cache->setStatusSaving();
}
// make your heavy processing.... (saving the result in a variable)
// dump the result
echo $result;
// cache the result
$cache->save($result);Currently, Hybrid Cache includes drivers for caching on Disk, Memcache and Redis, but you can extend it creating your own key/value storage connector, implementing the Hybrid\StorageMedia interface.
Storage instances can be assigned for reading and writing, and you can have multiple different storage systems.
Consider you have the following scenario using Redis:
10.1.30.1 Redis master
10.1.30.2 Redis replican
10.1.30.3 Redis replican
10.1.30.4 Redis replican
10.1.30.5 Redis replican
You can set it up like this:
<?php
use Hybrid\Storages\Redis as RedisStorage;
// Define Redis server for write only (master)
Cache::addStorageMedia( new RedisStorage('10.1.30.1'), Cache::FOR_WRITE );
// Define the rest of servers for read only
Cache::addStorageMedia( new RedisStorage('10.1.30.2'), Cache::FOR_READ );
Cache::addStorageMedia( new RedisStorage('10.1.30.3'), Cache::FOR_READ );
Cache::addStorageMedia( new RedisStorage('10.1.30.4'), Cache::FOR_READ );
Cache::addStorageMedia( new RedisStorage('10.1.30.5'), Cache::FOR_READ );By default, HybridCache uses a hash-based mechanism to balance load on multiple storage media. In this case, each server will receive the same amount of petitions. In a replication scenario a random petition distribution is more effective and HybridCache can try using another server on the list if the first one doesn't return anything.
To change the balancing method you should change the balanceMethod property of the instance:
<?php
$cache = Cache::create('key');
$cache->balanceMethod = Cache::B_RANDOM;However, if you wish to apply the change globally for all new instances of the HybridCache class, you can define a constant:
<?php
define('CACHE_BALANCE_METHOD',Cache::B_RANDOM);Note that the random method is extremely inefficient when there are several master servers.
Horizontal scalability can be achieved with any storage media and sometimes it's better than replication.
In this case you define a number of storage media and the balancing is done using a hash generated by the key-value pair. All backend use the same algorithm, so they will all fetch the cache on the corresponding storage medium. It is very important to define the storages in the same order in all the backend servers, since the algorithm is based on the order and amount of them.
By default HybridCache uses a hash balance method, but if you want to be sure, you can set it explicitly:
<?php
define('CACHE_BALANCE_METHOD',Cache::B_HASH);To define a scalation array:
<?php
use Hybrid\Storages\Memcache as MemcacheStorage;
Cache::addStorageMedia( new MemcacheStorage('10.1.30.1') );
Cache::addStorageMedia( new MemcacheStorage('10.1.30.2') );
Cache::addStorageMedia( new MemcacheStorage('10.1.30.3') );
Cache::addStorageMedia( new MemcacheStorage('10.1.30.4') );
Cache::addStorageMedia( new MemcacheStorage('10.1.30.5') );Important: HybridCache doesn't support HA (High Availability) methods in this scenario yet. We expect to implement failover mechanisms on future versions.
In future versions we're planning to implement groups of arrays that can combine the efficency of scalability with the fault tolerance of replication.
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