more refactoring on the framework.

laravel/cache/drivers/driver.php

@@ -0,0 +1,79 @@
+<?php namespace Laravel\Cache\Drivers;
+
+use Closure;
+
+abstract class Driver {
+
+	/**
+	 * Determine if an item exists in the cache.
+	 *
+	 * @param  string  $key
+	 * @return bool
+	 */
+	abstract public function has($key);
+
+	/**
+	 * Get an item from the cache.
+	 *
+	 * A default value may also be specified, and will be returned in the requested
+	 * item does not exist in the cache.
+	 *
+	 * @param  string  $key
+	 * @param  mixed   $default
+	 * @param  string  $driver
+	 * @return mixed
+	 */
+	public function get($key, $default = null)
+	{
+		if ( ! is_null($item = $this->retrieve($key))) return $item;
+
+		return ($default instanceof Closure) ? call_user_func($default) : $default;
+	}
+
+	/**
+	 * Retrieve an item from the cache driver.
+	 *
+	 * @param  string  $key
+	 * @return mixed
+	 */
+	abstract protected function retrieve($key);
+
+	/**
+	 * Write an item to the cache for a given number of minutes.
+	 *
+	 * @param  string  $key
+	 * @param  mixed   $value
+	 * @param  int     $minutes
+	 * @return void
+	 */
+	abstract public function put($key, $value, $minutes);
+
+	/**
+	 * Get an item from the cache. If the item doesn't exist in the cache, store
+	 * the default value in the cache and return it.
+	 *
+	 * @param  string  $key
+	 * @param  mixed   $default
+	 * @param  int     $minutes
+	 * @return mixed
+	 */
+	public function remember($key, $value, $minutes)
+	{
+		if ( ! is_null($item = $this->get($key, null))) return $item;
+
+		$default = ($default instanceof Closure) ? call_user_func($default) : $default;
+
+		$this->put($key, $default, $minutes);
+
+		return $default;
+	}
+
+	/**
+	 * Delete an item from the cache.
+	 *
+	 * @param  string  $key
+	 * @return void
+	 */
+	abstract public function forget($key);
+
+}