make the cache adapter as config options and use them when calling the cache lib

application/config/config.sample.php

@@ -384,14 +384,36 @@ $config['error_views_path'] = '';
 
 /*
 |--------------------------------------------------------------------------
-| Cache Directory Path
+| Cache Configuration
 |--------------------------------------------------------------------------
 |
-| Leave this BLANK unless you would like to set something other than the default
-| application/cache/ directory.  Use a full server path with trailing slash.
+| CodeIgniter supports multiple cache adapters to improve application performance
+| by storing frequently accessed data.
+|
+| 'cache_path'
+|     Directory path for file-based caching. Leave BLANK to use the default
+|     application/cache/ directory. Use absolute paths with trailing slash.
+|     Must be writable by the web server (typically www-data or apache user).
+|     Example: /var/cache/wavelog/ or /tmp/wavelog_cache/
+|
+| 'cache_adapter'
+|     The primary cache adapter to use. Options include:
+|     - 'file'      : File-based caching (default, works everywhere)
+|     - 'redis'     : Redis in-memory cache (requires Redis server & extension)
+|     - 'memcached' : Memcached (requires Memcached server & extension)
+|     - 'apc'       : APC/APCu in-memory cache (requires APCu extension)
+|     - 'wincache'  : Windows Cache (requires WinCache extension)
+|
+| 'cache_backup'
+|     Fallback adapter if primary adapter fails or is unavailable.
+|     Recommended: 'file' as a safe fallback option
+|
+| Note: Redis configuration is stored separately in application/config/redis.php
 |
 */
 $config['cache_path'] = '';
+$config['cache_adapter'] = 'file';
+$config['cache_backup'] = 'file';
 
 /*
 |--------------------------------------------------------------------------

application/controllers/Api.php

@@ -1255,7 +1255,7 @@ class API extends CI_Controller {
 		}
 
 		// Load cache driver
-		$this->load->driver('cache', ['adapter' => 'file']);
+		$this->load->driver('cache', ['adapter' => $this->config->item('cache_adapter'), 'backup' => $this->config->item('cache_backup')]);
 
 		// Create cache key
 		$cache_key = "wp_stats_{$station_id}";

application/controllers/Contestcalendar.php

@@ -126,7 +126,7 @@ class Contestcalendar extends CI_Controller {
 
 	private function getRssData() {
 
-		$this->load->driver('cache', array('adapter' => 'file', 'backup' => 'file'));
+		$this->load->driver('cache', ['adapter' => $this->config->item('cache_adapter'), 'backup' => $this->config->item('cache_backup')]);
 
 		if (!$rssRawData = $this->cache->get('RssRawContestCal')) {
 

application/controllers/Dxcalendar.php

@@ -13,7 +13,7 @@ class Dxcalendar extends CI_Controller {
 
 		$data['page_title'] = __("DX Calendar");
 
-		$this->load->driver('cache', array('adapter' => 'file', 'backup' => 'file'));
+		$this->load->driver('cache', ['adapter' => $this->config->item('cache_adapter'), 'backup' => $this->config->item('cache_backup')]);
 		$rssUrl = 'http://www.ng3k.com/adxo.xml';
 		if (!$rssRawData = $this->cache->get('RssRawDxCal')) {
 			$rssRawData = file_get_contents($rssUrl, true);

application/controllers/Sattimers.php

@@ -18,7 +18,7 @@ class Sattimers extends CI_Controller {
 
 		$url = 'https://www.df2et.de/tevel/api2.php?grid='.strtoupper($this->stations->find_gridsquare());
 
-		$this->load->driver('cache', array('adapter' => 'file', 'backup' => 'file'));
+		$this->load->driver('cache', ['adapter' => $this->config->item('cache_adapter'), 'backup' => $this->config->item('cache_backup')]);
 		if (!$RawData = $this->cache->get('SatTimers'.strtoupper($this->stations->find_gridsquare()))) {
 			$RawData = file_get_contents($url, true);
 			$this->cache->save('SatTimers'.strtoupper($this->stations->find_gridsquare()), $RawData, (60*1));

application/libraries/Rate_limit.php

@@ -15,7 +15,7 @@ class Rate_limit {
 
     public function __construct() {
         $this->CI =& get_instance();
-        $this->CI->load->driver('cache', ['adapter' => 'file']);
+        $this->CI->load->driver('cache', ['adapter' => $this->CI->config->item('cache_adapter'), 'backup' => $this->CI->config->item('cache_backup')]);
 
         // Load rate limit config - if not set or empty, rate limiting is disabled
         $this->rate_limits = $this->CI->config->item('api_rate_limits');

application/models/Dxcluster_model.php

@@ -53,7 +53,7 @@ class Dxcluster_model extends CI_Model {
 
 		// Only load cache driver if caching is enabled
 		if ($cache_band_enabled || $cache_worked_enabled) {
-			$this->load->driver('cache', array('adapter' => 'file', 'backup' => 'file'));
+			$this->load->driver('cache', ['adapter' => $this->config->item('cache_adapter'), 'backup' => $this->config->item('cache_backup')]);
 
 			// Garbage collection: 1% chance to clean expired cache files
 			// Only needed when worked cache is enabled (creates many per-callsign files)

application/models/Logbook_model.php

@@ -2716,7 +2716,7 @@ class Logbook_model extends CI_Model {
 		// Load cache driver for file caching
 		$cache_enabled = $this->config->item('enable_dxcluster_file_cache_worked') === true;
 		if ($cache_enabled && !isset($this->cache)) {
-			$this->load->driver('cache', array('adapter' => 'file', 'backup' => 'file'));
+			$this->load->driver('cache', ['adapter' => $this->config->item('cache_adapter'), 'backup' => $this->config->item('cache_backup')]);
 		}
 
 		// Cache TTL in seconds (15 minutes = 900 seconds)

src/Dxcc/Dxcc.php

@@ -323,7 +323,7 @@ class Dxcc {
     */
     function read_data($date = NULL) {
 		$CI = &get_instance();
-		$CI->load->driver('cache', ['adapter' => 'file']);
+		$CI->load->driver('cache', ['adapter' => $CI->config->item('cache_adapter'), 'backup' => $CI->config->item('cache_backup')]);
 
 		// DXCC Exceptions
 		$cache_key = 'dxcc_exceptions_' . ($date ?? 'all');