Fixing functions coverage.

cmatosbc · Dec 15, 2024 · d545c02 · d545c02
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diff --git a/.phpcs-cache b/.phpcs-cache
@@ -1 +1 @@
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diff --git a/README.md b/README.md
@@ -218,6 +218,89 @@ Tags support parameter interpolation just like cache keys, allowing you to creat
 4. Use cache invalidation when data is modified
 5. Consider using cache tags for group invalidation
 
+## Function Caching
+
+In addition to method caching, Mnemosyne supports caching standalone functions using the `CacheManager`. This is useful when you need to cache results of functions outside of classes.
+
+#### Basic Function Caching
+
+```php
+use Mnemosyne\Cache;
+use Mnemosyne\CacheManager;
+
+// Set up the cache implementation
+CacheManager::setCache($cache);
+
+// Create a cached version of your function
+$expensiveCalculation = function(int $n) {
+    return CacheManager::wrap(
+        fn() => fibonacci($n),  // Original function call
+        ['n' => $n],           // Parameters for key interpolation
+        new Cache(
+            key: 'fib:{n}',    // Cache key template
+            ttl: 3600          // Time-to-live in seconds
+        )
+    );
+};
+
+// Use the cached function
+$result = $expensiveCalculation(10);
+```
+
+#### Function Caching with Tags
+
+```php
+// Cache function results with tags for group invalidation
+$getCityWeather = function(string $city) {
+    return CacheManager::wrap(
+        fn() => fetchWeatherData($city),
+        ['city' => $city],
+        new Cache(
+            key: 'weather:{city}',
+            ttl: 1800,
+            tags: ['weather', "city-{city}"]
+        )
+    );
+};
+
+// Cache multiple cities
+$nyWeather = $getCityWeather('new-york');
+$laWeather = $getCityWeather('los-angeles');
+
+// Later, invalidate all weather caches
+$cache->delete('tag:weather');
+```
+
+#### Caching Complex Functions
+
+```php
+// Example with multiple parameters and complex key generation
+$searchUsers = function(string $query, int $page, int $limit) {
+    return CacheManager::wrap(
+        fn() => performUserSearch($query, $page, $limit),
+        [
+            'q' => $query,
+            'page' => $page,
+            'limit' => $limit
+        ],
+        new Cache(
+            key: 'search:users:{q}:p{page}:l{limit}',
+            ttl: 1800,
+            serialize: true  // Enable serialization for complex results
+        )
+    );
+};
+
+// Use the cached search function
+$results = $searchUsers('john', 1, 20);
+```
+
+This approach to function caching provides:
+- Easy integration with existing functions
+- Support for all Cache attribute features (TTL, tags, serialization)
+- Flexible cache key generation
+- Clear separation of caching logic from business logic
+
 ## Testing
 
 The library includes comprehensive PHPUnit tests. Run them with:
@@ -232,4 +315,4 @@ This project is licensed under the GNU General Public License v3.0 or later - se
 
 ## Contributing
 
-Contributions are welcome! Please feel free to submit a Pull Request.
+Contributions are welcome! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change.
diff --git a/src/Cache.php b/src/Cache.php
@@ -17,6 +17,13 @@
  * {
  *     return $this->cacheCall('doGetUser', func_get_args());
  * }
+ *
+ * // Function caching example
+ * #[Cache(key: 'factorial:{n}')]
+ * function factorial(int $n): int {
+ *     if ($n <= 1) return 1;
+ *     return $n * factorial($n - 1);
+ * }
  * ```
  *
  * @author Carlos Matos <carlos@example.com>

diff --git a/src/CacheManager.php b/src/CacheManager.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Mnemosyne;
+
+use Psr\SimpleCache\CacheInterface;
+
+/**
+ * Manages caching for functions.
+ *
+ * This class provides caching functionality for functions using a wrapper approach.
+ * It uses a PSR-16 compatible cache implementation and handles cache key generation,
+ * storage, and retrieval.
+ */
+class CacheManager
+{
+    private static ?CacheInterface $cache = null;
+
+    /**
+     * Set the cache implementation to use.
+     */
+    public static function setCache(CacheInterface $cache): void
+    {
+        self::$cache = $cache;
+    }
+
+    /**
+     * Get the current cache implementation.
+     */
+    public static function getCache(): ?CacheInterface
+    {
+        return self::$cache;
+    }
+
+    /**
+     * Wrap a function call with caching behavior.
+     *
+     * @param callable $function The function to cache
+     * @param array $params Named parameters for key interpolation
+     * @param Cache $attribute The cache attribute instance
+     * @return mixed The cached or computed result
+     */
+    public static function wrap(callable $function, array $params, Cache $attribute): mixed
+    {
+        if (!self::$cache) {
+            throw new \RuntimeException('Cache implementation not set. Call CacheManager::setCache() first.');
+        }
+
+        $key = self::resolveCacheKey($attribute->key, $params);
+
+        // Check if value is already cached
+        if (self::$cache->has($key)) {
+            return self::$cache->get($key);
+        }
+
+        // Call the original function
+        $result = $function();
+
+        // Cache the result
+        self::$cache->set($key, $result, $attribute->ttl);
+
+        // Handle tags if present
+        if (!empty($attribute->tags)) {
+            foreach ($attribute->tags as $tag) {
+                $tagKey = "tag:$tag";
+                $keys = self::$cache->get($tagKey, []);
+                $keys[] = $key;
+                self::$cache->set($tagKey, array_unique($keys));
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Resolve a cache key template using parameters.
+     */
+    private static function resolveCacheKey(?string $template, array $params): string
+    {
+        if ($template === null) {
+            // Generate automatic key based on parameters
+            return md5(serialize($params));
+        }
+
+        return preg_replace_callback(
+            '/{([^}]+)}/',
+            fn($m) => $params[$m[1]] ?? '',
+            $template
+        );
+    }
+}
diff --git a/tests/CacheFunctionTest.php b/tests/CacheFunctionTest.php
@@ -0,0 +1,109 @@
+<?php
+
+namespace Mnemosyne\Tests;
+
+use Mnemosyne\Cache;
+use Mnemosyne\CacheManager;
+use Mnemosyne\Tests\Fixtures\MockCache;
+use PHPUnit\Framework\TestCase;
+
+class CacheFunctionTest extends TestCase
+{
+    private MockCache $cache;
+    private static int $fibonacciCalls = 0;
+    private static int $greetCalls = 0;
+
+    protected function setUp(): void
+    {
+        $this->cache = new MockCache();
+        CacheManager::setCache($this->cache);
+        self::$fibonacciCalls = 0;
+        self::$greetCalls = 0;
+    }
+
+    private function fibonacci(int $n): int 
+    {
+        self::$fibonacciCalls++;
+        return $n <= 1 ? $n : $this->fibonacci($n - 1) + $this->fibonacci($n - 2);
+    }
+
+    private function greet(string $name): string 
+    {
+        self::$greetCalls++;
+        return "Hello, $name!";
+    }
+
+    public function testFibonacciCaching(): void
+    {
+        echo "\nTest: Fibonacci Function Caching\n";
+        echo "------------------------------\n";
+
+        $cachedFib = function(int $n) {
+            return CacheManager::wrap(
+                fn() => $this->fibonacci($n),
+                ['n' => $n],
+                new Cache(key: 'fibonacci:{n}', ttl: 3600)
+            );
+        };
+
+        // First call should compute and cache
+        echo "First call (should miss cache and compute):\n";
+        $result1 = $cachedFib(10);
+        $initialCalls = self::$fibonacciCalls;
+        echo "Result: $result1\n";
+        echo "Function calls: " . self::$fibonacciCalls . "\n";
+        echo "Cache operations: " . count($this->cache->operations) . "\n";
+
+        // Second call should use cache
+        echo "\nSecond call (should hit cache):\n";
+        $result2 = $cachedFib(10);
+        echo "Result: $result2\n";
+        echo "Additional function calls: " . (self::$fibonacciCalls - $initialCalls) . "\n";
+        echo "Total cache operations: " . count($this->cache->operations) . "\n";
+
+        $this->assertEquals($result1, $result2);
+        $this->assertEquals(55, $result1); // Known fibonacci(10) result
+        $this->assertEquals($initialCalls, self::$fibonacciCalls, 'Function should not be called again when cached');
+    }
+
+    public function testGreetingWithTags(): void
+    {
+        echo "\nTest: Greeting Function with Tags\n";
+        echo "-------------------------------\n";
+
+        $cachedGreet = function(string $name) {
+            return CacheManager::wrap(
+                fn() => $this->greet($name),
+                ['name' => $name],
+                new Cache(key: 'greet:{name}', tags: ['greetings'])
+            );
+        };
+
+        // First call
+        echo "First call with name 'John':\n";
+        $result1 = $cachedGreet('John');
+        $initialCalls = self::$greetCalls;
+        echo "Result: $result1\n";
+        echo "Function calls: " . self::$greetCalls . "\n";
+        echo "Cache operations: " . count($this->cache->operations) . "\n";
+
+        // Second call
+        echo "\nSecond call with same name:\n";
+        $result2 = $cachedGreet('John');
+        echo "Result: $result2\n";
+        echo "Additional function calls: " . (self::$greetCalls - $initialCalls) . "\n";
+        echo "Total cache operations: " . count($this->cache->operations) . "\n";
+
+        $this->assertEquals('Hello, John!', $result1);
+        $this->assertEquals($initialCalls, self::$greetCalls, 'Function should not be called again when cached');
+
+        // Verify tag was stored
+        $this->assertTrue(
+            $this->cache->has('tag:greetings'),
+            'Tag should be stored in cache'
+        );
+
+        echo "\nTag verification:\n";
+        echo "Tag 'greetings' exists in cache: " . ($this->cache->has('tag:greetings') ? 'yes' : 'no') . "\n";
+    }
+}
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