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<?php
namespace Apptus\Util\Cache;

/**
 * An implementation of the StateCache interface using arrays.
 *
 * This class will keep state during a request (and even forget state
 * as it should if it is a long request) but as it is using ordinary
 * PHP arrays, no state will be kept between requests. Thus, every
 * request begins with an empty cache.
 */
class ArrayStateCache implements StateCache {
    private $times = array ();
    private $cache = array ();

    public function clear() {
        $this->times = array ();
        $this->cache = array ();
    }

    private function expireKey($key) {
        if (isset($this->times[$key]) && microtime(true) > $this->times[$key]) {
            unset($this->times[$key]);
            unset($this->cache[$key]);
        }
    }

    private function insert($key, $value, $expire) {
        if ($expire !== 0) {
            $this->times[$key] = microtime(true) + $expire;
        }
        $this->cache[$key] = $value;
    }

    public function add($key, $value, $expire) {
        $key = (string) $key;
        $value = (string) $value;
        $this->expireKey($key);
        if (isset($this->cache[$key])) return false;
        $this->insert($key, $value, $expire);
        return true;
    }

    public function delete($key) {
        $key = (string) $key;
        $this->expireKey($key);
        if (!isset($this->cache[$key])) return false;
        unset($this->times[$key]);
        unset($this->cache[$key]);
        return true;
    }

    public function get($key) {
        $key = (string) $key;
        $this->expireKey($key);
        if (isset($this->cache[$key])) return $this->cache[$key];
        return false;
    }

    public function getMulti($keys) {
        $result = array ();
        foreach ($keys as $key) {
            $key = (string) $key;
            $r = $this->get($key);
            if ($r !== false) {
                $result[$key] = $r;
            }
        }
        return $result;
    }

    public function replace($key, $value, $expire) {
        $key = (string) $key;
        $value = (string) $value;
        $this->expireKey($key);
        if (isset($this->cache[$key])) {
            $this->insert($key, $value, $expire);
            return true;
        }
        return false;
    }

    public function set($key, $value, $expire) {
        $key = (string) $key;
        $value = (string) $value;
        $this->insert($key, $value, $expire);
        return true;
    }

    public function setMulti($items, $expire) {
        foreach ($items as $key => $value) {
            $key = (string) $key;
            $value = (string) $value;
            $this->insert($key, $value, $expire);
        }
        return true;
    }
}
Apptus ESales Connector PHP API documentation generated by ApiGen