feature #18176 [Cache] Restrict flushes to namespace scopes (nicolas-…

…grekas)

This PR was merged into the 3.1-dev branch.

Discussion
----------

[Cache] Restrict flushes to namespace scopes

| Q             | A
| ------------- | ---
| Branch        | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | no
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Instead of flushing all cache namespaces all the time, we can flush only the keys in the namespace.

Commits
-------

8744443 [Cache] Restrict flushes to namespace scopes

src/Symfony/Component/Cache/Adapter/ApcuAdapter.php

@@ -50,7 +50,9 @@ protected function doHave($id)
      */
     protected function doClear($namespace)
     {
-        return apcu_clear_cache();
+        return isset($namespace[0]) && class_exists('APCuIterator', false)
+            ? apcu_delete(new \APCuIterator(sprintf('/^%s/', preg_quote($namespace, '/')), APC_ITER_KEY))
+            : apcu_clear_cache();
     }
 
     /**

src/Symfony/Component/Cache/Adapter/DoctrineAdapter.php

@@ -22,8 +22,9 @@ class DoctrineAdapter extends AbstractAdapter
 
     public function __construct(CacheProvider $provider, $defaultLifetime = 0, $namespace = '')
     {
-        parent::__construct($namespace, $defaultLifetime);
+        parent::__construct('', $defaultLifetime);
         $this->provider = $provider;
+        $provider->setNamespace($namespace);
     }
 
     /**
@@ -47,7 +48,11 @@ protected function doHave($id)
      */
     protected function doClear($namespace)
     {
-        return $this->provider->flushAll();
+        $namespace = $this->provider->getNamespace();
+
+        return isset($namespace[0])
+            ? $this->provider->deleteAll()
+            : $this->provider->flushAll();
     }
 
     /**