added cache decorator classes

app/Impl/Repo/Article/AbstractArticleDecorator.php

@@ -0,0 +1,42 @@
+<?php namespace Impl\Repo\Article;
+
+abstract class AbstractArticleDecorator implements ArticleInterface {
+
+    protected $nextArticle;
+
+    public function __construct(ArticleInterface $article)
+    {
+        $this->nextArticle = $article;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    abstract public function byId($id);
+
+    /**
+     * {@inheritdoc}
+     */
+    abstract public function byPage($page=1, $limit=10, $all=false);
+
+    /**
+     * {@inheritdoc}
+     */
+    abstract public function bySlug($slug);
+
+   /**
+     * {@inheritdoc}
+     */
+    abstract public function byTag($tag, $page=1, $limit=10);
+
+    /**
+     * {@inheritdoc}
+     */
+    abstract public function create(array $data);
+
+    /**
+     * {@inheritdoc}
+     */
+    abstract public function update(array $data);
+
+}

app/Impl/Repo/Article/CacheDecorator.php

@@ -0,0 +1,128 @@
+<?php namespace Impl\Repo\Article;
+
+use Impl\Service\Cache\CacheInterface;
+
+class CacheDecorator extends AbstractArticleDecorator {
+
+    protected $nextArticle;
+    protected $cache;
+
+    public function __construct(ArticleInterface $article, CacheInterface $cache)
+    {
+        $this->nextArticle = $article;
+        $this->cache = $cache;
+    }
+
+    /**
+     * Attempt to retrieve from cache
+     * by ID
+     * {@inheritdoc}
+     */
+    public function byId($id)
+    {
+        $key = md5('id.'.$id);
+
+        if( $this->cache->has($key) )
+        {
+            return $this->cache->get($key);
+        }
+
+        $article = $this->nextArticle->byId($id);
+
+        $this->cache->put($key, $article);
+
+        return $article;
+    }
+
+    /**
+     * Attempt to retrieve from cache
+     * {@inheritdoc}
+     */
+    public function byPage($page=1, $limit=10, $all=false)
+    {
+        $allkey = ($all) ? '.all' : '';
+        $key = md5('page.'.$page.'.'.$limit.$allkey);
+
+        if( $this->cache->has($key) )
+        {
+            return $this->cache->get($key);
+        }
+
+        $articles = $this->nextArticle->byPage($page, $limit);
+
+        $cached = $this->cache->putPaginated(
+            $page,
+            $limit,
+            $this->nextArticle->totalArticles($all),
+            $articles->all(),
+            $key
+        );
+
+        return $cached;
+    }
+
+    /**
+     * Attempt to retrieve from cache
+     * {@inheritdoc}
+     */
+    public function bySlug($slug)
+    {
+        $key = md5('slug.'.$slug);
+
+        if( $this->cache->has($key) )
+        {
+            return $this->cache->get($key);
+        }
+
+        $article = $this->nextArticle->bySlug($slug);
+
+        $this->cache->put($key, $article);
+
+        return $article;
+    }
+
+    /**
+     * Attempt to retrieve from cache
+     * {@inheritdoc}
+     */
+    public function byTag($tag, $page=1, $limit=10)
+    {
+        $key = md5('tag.'.$tag.'.'.$page.'.'.$limit);
+
+        if( $this->cache->has($key) )
+        {
+            return $this->cache->get($key);
+        }
+
+        $articles = $this->nextArticle->byId($tag, $page, $limit);
+
+        $cached = $this->cache->put(
+            $page,
+            $limit,
+            $this->nextArticle->totalByTag($tag),
+            $articles->all(),
+            $key
+        );
+
+        return $cached;
+    }
+
+    /**
+     * Pass creation of article thru
+     * {@inheritdoc}
+     */
+    public function create(array $data)
+    {
+        return $this->nextArticle->byId($data);
+    }
+
+    /**
+     * Pass update of article thru
+     * {@inheritdoc}
+     */
+    public function update(array $data)
+    {
+        return $this->nextArticle->update($data);
+    }
+
+}