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Filename : Pool.php
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<?php

/*
 * This file is part of the Stash package.
 *
 * (c) Robert Hafner <tedivm@tedivm.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Platform360\Stash;

use Platform360\Psr\Cache\CacheItemInterface;
use Psr\Log\LoggerInterface;
use Platform360\Stash\Exception\InvalidArgumentException;
use Platform360\Stash\Driver\Ephemeral;
use Platform360\Stash\Interfaces\DriverInterface;
use Platform360\Stash\Interfaces\ItemInterface;
use Platform360\Stash\Interfaces\PoolInterface;
/**
 *
 *
 * @package Stash
 * @author  Robert Hafner <tedivm@tedivm.com>
 */
class Pool implements PoolInterface
{
    /**
     * The cacheDriver being used by the system. While this class handles all of the higher functions, it's the cache
     * driver here that handles all of the storage/retrieval functionality. This value is set by the constructor.
     *
     * @var \Stash\Interfaces\DriverInterface
     */
    protected $driver;
    /**
     * Is this Pool disabled.
     *
     * @var bool
     */
    protected $isDisabled = \false;
    /**
     * Default "Item" class to use for making new items.
     *
     * @var string
     */
    protected $itemClass = 'Platform360\\Stash\\Item';
    /**
     * If set various then errors and exceptions will get passed to the PSR Compliant logging library. This
     * can be set using the setLogger() function in this class.
     *
     * @var \Psr\Log\LoggerInterface
     */
    protected $logger;
    /**
     * Current namespace, if any.
     *
     * @var string
     */
    protected $namespace;
    /**
     * The default cache invalidation method for items created by this pool object.
     *
     * @var int
     */
    protected $invalidationMethod = Invalidation::PRECOMPUTE;
    /**
     * Argument 1 for the default cache invalidation method
     *
     * @var mixed
     */
    protected $invalidationArg1 = null;
    /**
     * Argument 2 for the default cache invalidation method
     *
     * @var mixed
     */
    protected $invalidationArg2 = null;
    /**
     * The constructor takes a Driver class which is used for persistent
     * storage. If no driver is provided then the Ephemeral driver is used by
     * default.
     *
     * @param DriverInterface $driver
     */
    public function __construct(?DriverInterface $driver = null)
    {
        if (isset($driver)) {
            $this->setDriver($driver);
        } else {
            $this->driver = new Ephemeral();
        }
    }
    /**
     * {@inheritdoc}
     */
    public function setItemClass(string $class) : bool
    {
        if (!\class_exists($class)) {
            throw new InvalidArgumentException('Item class ' . $class . ' does not exist');
        }
        $interfaces = \class_implements($class, \true);
        if (!\in_array('Platform360\\Stash\\Interfaces\\ItemInterface', $interfaces)) {
            throw new \InvalidArgumentException('Item class ' . $class . ' must inherit from \\Stash\\Interfaces\\ItemInterface');
        }
        $this->itemClass = $class;
        return \true;
    }
    /**
     * {@inheritdoc}
     */
    public function getItem(string $key) : CacheItemInterface
    {
        $keyString = \trim($key, '/');
        $key = \explode('/', $keyString);
        $namespace = empty($this->namespace) ? 'stash_default' : $this->namespace;
        \array_unshift($key, $namespace);
        foreach ($key as $node) {
            if (!isset($node[1]) && \strlen($node) < 1) {
                throw new InvalidArgumentException('Invalid or Empty Node passed to getItem constructor.');
            }
        }
        /** @var ItemInterface $item */
        $item = new $this->itemClass();
        $item->setPool($this);
        $item->setKey($key, $namespace);
        $item->setInvalidationMethod($this->invalidationMethod, $this->invalidationArg1, $this->invalidationArg2);
        if ($this->isDisabled) {
            $item->disable();
        }
        if (isset($this->logger)) {
            $item->setLogger($this->logger);
        }
        return $item;
    }
    /**
     * {@inheritdoc}
     */
    public function getItems(array $keys = array()) : iterable
    {
        // temporarily cheating here by wrapping around single calls.
        $items = array();
        foreach ($keys as $key) {
            $item = $this->getItem($key);
            $items[$item->getKey()] = $item;
        }
        return new \ArrayIterator($items);
    }
    /**
     * {@inheritdoc}
     */
    public function hasItem(string $key) : bool
    {
        return $this->getItem($key)->isHit();
    }
    /**
     * {@inheritdoc}
     */
    public function save(CacheItemInterface $item) : bool
    {
        return $item->save();
    }
    /**
     * {@inheritdoc}
     */
    public function saveDeferred(CacheItemInterface $item) : bool
    {
        return $this->save($item);
    }
    /**
     * {@inheritdoc}
     */
    public function commit() : bool
    {
        return \true;
    }
    /**
     * {@inheritdoc}
     */
    public function deleteItems(array $keys) : bool
    {
        // temporarily cheating here by wrapping around single calls.
        $results = \true;
        foreach ($keys as $key) {
            $results = $this->deleteItem($key) && $results;
        }
        return $results;
    }
    /**
     * {@inheritdoc}
     */
    public function deleteItem(string $key) : bool
    {
        return $this->getItem($key)->clear();
    }
    /**
     * {@inheritdoc}
     */
    public function clear() : bool
    {
        if ($this->isDisabled) {
            return \false;
        }
        try {
            $driver = $this->getDriver();
            if (isset($this->namespace)) {
                $normalizedNamespace = \strtolower($this->namespace);
                $results = $driver->clear(array('cache', $normalizedNamespace)) && $driver->clear(array('sp', $normalizedNamespace));
            } else {
                $results = $driver->clear();
            }
        } catch (\Exception $e) {
            $this->isDisabled = \true;
            $this->logException('Flushing Cache Pool caused exception.', $e);
            return \false;
        }
        return $results;
    }
    /**
     * {@inheritdoc}
     */
    public function purge() : bool
    {
        if ($this->isDisabled) {
            return \false;
        }
        try {
            $results = $this->getDriver()->purge();
        } catch (\Exception $e) {
            $this->isDisabled = \true;
            $this->logException('Purging Cache Pool caused exception.', $e);
            return \false;
        }
        return $results;
    }
    /**
     * {@inheritdoc}
     */
    public function setDriver(DriverInterface $driver) : void
    {
        $this->driver = $driver;
    }
    /**
     * {@inheritdoc}
     */
    public function getDriver() : DriverInterface
    {
        return $this->driver;
    }
    /**
     * {@inheritdoc}
     */
    public function setNamespace(?string $namespace = null) : bool
    {
        if (\is_null($namespace)) {
            $this->namespace = null;
            return \true;
        }
        if (!\ctype_alnum($namespace)) {
            throw new \InvalidArgumentException('Namespace must be alphanumeric.');
        }
        $this->namespace = $namespace;
        return \true;
    }
    /**
     * {@inheritdoc}
     */
    public function getNamespace() : bool|string
    {
        return isset($this->namespace) ? $this->namespace : \false;
    }
    /**
     * {@inheritdoc}
     */
    public function setLogger(LoggerInterface $logger) : bool
    {
        $this->logger = $logger;
        return \true;
    }
    /**
     * {@inheritdoc}
     */
    public function setInvalidationMethod(int $invalidation = Invalidation::PRECOMPUTE, mixed $arg = null, mixed $arg2 = null) : bool
    {
        $this->invalidationMethod = $invalidation;
        $this->invalidationArg1 = $arg;
        $this->invalidationArg2 = $arg2;
        return \true;
    }
    /**
     * Logs an exception with the Logger class, if it exists.
     *
     * @param  string     $message
     * @param  \Exception $exception
     * @return bool
     */
    protected function logException(string $message, \Exception $exception) : bool
    {
        if (!isset($this->logger)) {
            return \false;
        }
        $this->logger->critical($message, array('exception' => $exception));
        return \true;
    }
}