<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace core_cache;

/**
 * Cache store interface.
 *
 * This interface defines the static methods that must be implemented by every cache store plugin.
 * To ensure plugins implement this class the abstract store class implements this interface.
 *
 * @package    core_cache
 * @category   cache
 * @copyright  2012 Sam Hemelryk
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
interface store_interface {
    /**
     * Static method to check if the store requirements are met.
     *
     * @return bool True if the stores software/hardware requirements have been met and it can be used. False otherwise.
     */
    public static function are_requirements_met();

    /**
     * Static method to check if a store is usable with the given mode.
     *
     * @param int $mode One of store::MODE_*
     */
    public static function is_supported_mode($mode);

    /**
     * Returns the supported features as a binary flag.
     *
     * @param array $configuration The configuration of a store to consider specifically.
     * @return int The supported features.
     */
    public static function get_supported_features(array $configuration = []);

    /**
     * Returns the supported modes as a binary flag.
     *
     * @param array $configuration The configuration of a store to consider specifically.
     * @return int The supported modes.
     */
    public static function get_supported_modes(array $configuration = []);

    /**
     * Generates an instance of the cache store that can be used for testing.
     *
     * Returns an instance of the cache store, or false if one cannot be created.
     *
     * @param definition $definition
     * @return store_interface|false
     */
    public static function initialise_test_instance(definition $definition);

    /**
     * Generates the appropriate configuration required for unit testing.
     *
     * @return array Array of unit test configuration data to be used by initialise().
     */
    public static function unit_test_configuration();
}

// Alias this class to the old name.
// This file will be autoloaded by the legacyclasses autoload system.
// In future all uses of this class will be corrected and the legacy references will be removed.
class_alias(store_interface::class, \cache_store_interface::class);