Initial

system/Cache/Exceptions/CacheException.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Cache\Exceptions;
+
+use CodeIgniter\Exceptions\DebugTraceableTrait;
+use CodeIgniter\Exceptions\ExceptionInterface;
+use RuntimeException;
+
+/**
+ * CacheException
+ */
+class CacheException extends RuntimeException implements ExceptionInterface
+{
+    use DebugTraceableTrait;
+
+    /**
+     * Thrown when handler has no permission to write cache.
+     *
+     * @return CacheException
+     */
+    public static function forUnableToWrite(string $path)
+    {
+        return new static(lang('Cache.unableToWrite', [$path]));
+    }
+
+    /**
+     * Thrown when an unrecognized handler is used.
+     *
+     * @return CacheException
+     */
+    public static function forInvalidHandlers()
+    {
+        return new static(lang('Cache.invalidHandlers'));
+    }
+
+    /**
+     * Thrown when no backup handler is setup in config.
+     *
+     * @return CacheException
+     */
+    public static function forNoBackup()
+    {
+        return new static(lang('Cache.noBackup'));
+    }
+
+    /**
+     * Thrown when specified handler was not found.
+     *
+     * @return CacheException
+     */
+    public static function forHandlerNotFound()
+    {
+        return new static(lang('Cache.handlerNotFound'));
+    }
+}

system/Cache/Exceptions/ExceptionInterface.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Cache\Exceptions;
+
+/**
+ * Provides a domain-level interface for broad capture
+ * of all framework-related exceptions.
+ *
+ * catch (\CodeIgniter\Cache\Exceptions\ExceptionInterface) { ... }
+ *
+ * @deprecated 4.1.2
+ */
+interface ExceptionInterface
+{
+}