first commit

vendor/doctrine/cache/lib/Doctrine/Common/Cache/ChainCache.php

@@ -0,0 +1,187 @@
+<?php
+
+namespace Doctrine\Common\Cache;
+
+use Traversable;
+use function array_values;
+use function count;
+use function iterator_to_array;
+
+/**
+ * Cache provider that allows to easily chain multiple cache providers
+ */
+class ChainCache extends CacheProvider
+{
+    /** @var CacheProvider[] */
+    private $cacheProviders = [];
+
+    /**
+     * @param CacheProvider[] $cacheProviders
+     */
+    public function __construct($cacheProviders = [])
+    {
+        $this->cacheProviders = $cacheProviders instanceof Traversable
+            ? iterator_to_array($cacheProviders, false)
+            : array_values($cacheProviders);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function setNamespace($namespace)
+    {
+        parent::setNamespace($namespace);
+
+        foreach ($this->cacheProviders as $cacheProvider) {
+            $cacheProvider->setNamespace($namespace);
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function doFetch($id)
+    {
+        foreach ($this->cacheProviders as $key => $cacheProvider) {
+            if ($cacheProvider->doContains($id)) {
+                $value = $cacheProvider->doFetch($id);
+
+                // We populate all the previous cache layers (that are assumed to be faster)
+                for ($subKey = $key - 1; $subKey >= 0; $subKey--) {
+                    $this->cacheProviders[$subKey]->doSave($id, $value);
+                }
+
+                return $value;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doFetchMultiple(array $keys)
+    {
+        /** @var CacheProvider[] $traversedProviders */
+        $traversedProviders = [];
+        $keysCount          = count($keys);
+        $fetchedValues      = [];
+
+        foreach ($this->cacheProviders as $key => $cacheProvider) {
+            $fetchedValues = $cacheProvider->doFetchMultiple($keys);
+
+            // We populate all the previous cache layers (that are assumed to be faster)
+            if (count($fetchedValues) === $keysCount) {
+                foreach ($traversedProviders as $previousCacheProvider) {
+                    $previousCacheProvider->doSaveMultiple($fetchedValues);
+                }
+
+                return $fetchedValues;
+            }
+
+            $traversedProviders[] = $cacheProvider;
+        }
+
+        return $fetchedValues;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function doContains($id)
+    {
+        foreach ($this->cacheProviders as $cacheProvider) {
+            if ($cacheProvider->doContains($id)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function doSave($id, $data, $lifeTime = 0)
+    {
+        $stored = true;
+
+        foreach ($this->cacheProviders as $cacheProvider) {
+            $stored = $cacheProvider->doSave($id, $data, $lifeTime) && $stored;
+        }
+
+        return $stored;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doSaveMultiple(array $keysAndValues, $lifetime = 0)
+    {
+        $stored = true;
+
+        foreach ($this->cacheProviders as $cacheProvider) {
+            $stored = $cacheProvider->doSaveMultiple($keysAndValues, $lifetime) && $stored;
+        }
+
+        return $stored;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function doDelete($id)
+    {
+        $deleted = true;
+
+        foreach ($this->cacheProviders as $cacheProvider) {
+            $deleted = $cacheProvider->doDelete($id) && $deleted;
+        }
+
+        return $deleted;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doDeleteMultiple(array $keys)
+    {
+        $deleted = true;
+
+        foreach ($this->cacheProviders as $cacheProvider) {
+            $deleted = $cacheProvider->doDeleteMultiple($keys) && $deleted;
+        }
+
+        return $deleted;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function doFlush()
+    {
+        $flushed = true;
+
+        foreach ($this->cacheProviders as $cacheProvider) {
+            $flushed = $cacheProvider->doFlush() && $flushed;
+        }
+
+        return $flushed;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function doGetStats()
+    {
+        // We return all the stats from all adapters
+        $stats = [];
+
+        foreach ($this->cacheProviders as $cacheProvider) {
+            $stats[] = $cacheProvider->doGetStats();
+        }
+
+        return $stats;
+    }
+}