subjective-php / psr-cache-helper

src/InMemoryCache.php

<?php

namespace SubjectivePHP\Psr\SimpleCache;

use ArrayObject;
use DateInterval;
use DateTime;
use Psr\SimpleCache\CacheInterface;

/**
 * A PSR-16 implementation which stores data in an array.
 */
final class InMemoryCache implements CacheInterface
{
    use KeyValidatorTrait;
    use TTLValidatorTrait;

    /**
     * @var ArrayObject
     */
    private $cache;

    /**
     * Construct a new instance of InMemoryCache.
     *
     * @param ArrayObject $cache Initial cache container.
     */
    public function __construct(ArrayObject $cache = null)
    {
        $this->cache = $cache ?? new ArrayObject();
    }

    /**
     * Fetches a value from the cache.
     *
     * @param string $key     The unique key of this item in the cache.
     * @param mixed  $default Default value to return if the key does not exist.
     *
     * @return mixed The value of the item from the cache, or $default in case of cache miss.
     *
     * @throws InvalidArgumentException Thrown if the $key string is not a legal value.
     */
    public function get($key, $default = null)//@codingStandardsIgnoreLine Interface does not define type-hints or return
    {
        $this->validateKey($key);
        $cache = $this->cache[$key] ?? null;
        if ($cache === null) {
            return $default;
        }

        if ($cache['expires'] >= time()) {
            return $cache['data'];
        }

        unset($this->cache[$key]);
        return $default;
    }

    /**
     * Obtains multiple cache items by their unique keys.
     *
     * @param iterable $keys    A list of keys that can obtained in a single operation.
     * @param mixed    $default Default value to return for keys that do not exist.
     *
     * @return array List of key => value pairs. Cache keys that do not exist or are stale will have $default as value.
     *
     * @throws InvalidArgumentException Thrown if the $key string is not a legal value.
     */
    public function getMultiple($keys, $default = null)//@codingStandardsIgnoreLine Interface does not define type-hints or return
    {
        $result = [];
        foreach ($keys as $key) {
            $result[$key] = $this->get($key, $default);
        }

        return $result;
    }

    /**
     * Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
     *
     * @param string                    $key   The key of the item to store.
     * @param mixed                     $value The value of the item to store, must be serializable.
     * @param null|integer|DateInterval $ttl   Optional. The TTL value of this item. If no value is sent and
     *                                         the driver supports TTL then the library may set a default value
     *                                         for it or let the driver take care of that.
     *
     * @return boolean True on success and false on failure.
     *
     * @throws InvalidArgumentException Thrown if the $key string is not a legal value.
     */
    public function set($key, $value, $ttl = null)//@codingStandardsIgnoreLine Interface does not define type-hints or return
    {
        $this->validateKey($key);
        $this->validateTTL($ttl);
        $this->cache[$key] = ['data' => $value, 'expires' => $this->getExpiration($ttl)];
        return true;
    }

    /**
     * Persists a set of key => value pairs in the cache, with an optional TTL.
     *
     * @param iterable                  $values A list of key => value pairs for a multiple-set operation.
     * @param null|integer|DateInterval $ttl    Optional. The TTL value of this item. If no value is sent and
     *                                          the driver supports TTL then the library may set a default value
     *                                          for it or let the driver take care of that.
     *
     * @return boolean True on success and false on failure.
     *
     * @throws InvalidArgumentException Thrown if $values is neither an array nor a Traversable,
     *                                  or if any of the $values are not a legal value.
     */
    public function setMultiple($values, $ttl = null)//@codingStandardsIgnoreLine Interface does not define type-hints or return
    {
        $keys = array_keys($values);

$values of type iterable is incompatible with the type array expected by parameter $array of array_keys().

        $this->validateKeys($keys);
        $this->getExpiration($ttl);

        foreach ($values as $key => $value) {
            $this->set($key, $value, $ttl);
        }

        return true;
    }

    /**
     * Delete an item from the cache by its unique key.
     *
     * @param string $key The unique cache key of the item to delete.
     *
     * @return boolean True if the item was successfully removed. False if there was an error.
     *
     * @throws InvalidArgumentException Thrown if the $key string is not a legal value.
     */
    public function delete($key)//@codingStandardsIgnoreLine Interface does not define type-hints or return
    {
        $this->validateKey($key);
        unset($this->cache[$key]);
        return true;
    }

    /**
     * Deletes multiple cache items in a single operation.
     *
     * @param iterable $keys A list of string-based keys to be deleted.
     *
     * @return boolean True if the items were successfully removed. False if there was an error.
     *
     * @throws InvalidArgumentException Thrown if $keys is neither an array nor a Traversable,
     *                                  or if any of the $keys are not a legal value.
     */
    public function deleteMultiple($keys)//@codingStandardsIgnoreLine Interface does not define type-hints
    {
        $this->validateKeys($keys);

$keys of type iterable is incompatible with the type array expected by parameter $keys of SubjectivePHP\Psr\SimpleCache\InMemoryCache::validateKeys().

        foreach ($keys as $key) {
            unset($this->cache[$key]);
        }

        return true;
    }

    /**
     * Wipes clean the entire cache's keys.
     *
     * @return boolean True on success and false on failure.
     */
    public function clear()//@codingStandardsIgnoreLine Interface does not define type-hints or return
    {
        $this->cache->exchangeArray([]);
        return true;
    }

    /**
     * Determines whether an item is present in the cache.
     *
     * NOTE: It is recommended that has() is only to be used for cache warming type purposes
     * and not to be used within your live applications operations for get/set, as this method
     * is subject to a race condition where your has() will return true and immediately after,
     * another script can remove it making the state of your app out of date.
     *
     * @param string $key The cache item key.
     *
     * @return boolean
     *
     * @throws InvalidArgumentException Thrown if the $key string is not a legal value.
     */
    public function has($key) //@codingStandardsIgnoreLine  Interface does not define type-hints
    {
        $this->validateKey($key);
        return $this->get($key, false) !== false;
    }

    /**
     * Converts the given time to live value to a DataTime instance;
     *
     * @param mixed $ttl The time-to-live value to validate.
     *
     * @return integer
     */
    private function getExpiration($ttl) : int
    {
        if ($ttl === null) {
            return PHP_INT_MAX;
        }

        if (is_int($ttl)) {
            return time() + $ttl;
        }

        return (new DateTime())->add($ttl)->getTimestamp();
    }
}