add forwarding emitter for agregating multiple emitters

diff --git a/lib/hooks/forwardingemitter.php b/lib/hooks/forwardingemitter.php
new file mode 100644 (file)
index 0000000..518641a
--- /dev/null
+++ b/lib/hooks/forwardingemitter.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OC\Hooks;
+
+/**
+ * Class ForwardingEmitter
+ *
+ * allows forwarding all listen calls to other emitters
+ *
+ * @package OC\Hooks
+ */
+abstract class ForwardingEmitter extends BasicEmitter {
+       /**
+        * @var \OC\Hooks\Emitter[] array
+        */
+       private $forwardEmitters = array();
+
+       /**
+        * @param string $scope
+        * @param string $method
+        * @param callable $callback
+        */
+       public function listen($scope, $method, $callback) {
+               parent::listen($scope, $method, $callback);
+               foreach ($this->forwardEmitters as $emitter) {
+                       $emitter->listen($scope, $method, $callback);
+               }
+       }
+
+       /**
+        * @param \OC\Hooks\Emitter $emitter
+        */
+       protected function forward($emitter) {
+               $this->forwardEmitters[] = $emitter;
+       }
+}

diff --git a/tests/lib/hooks/forwardingemitter.php b/tests/lib/hooks/forwardingemitter.php
new file mode 100644 (file)
index 0000000..0686ebe
--- /dev/null
+++ b/tests/lib/hooks/forwardingemitter.php
@@ -0,0 +1,62 @@
+<?php
+/**
+ * Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace Test\Hooks;
+use OC\Hooks\PublicEmitter;
+
+class DummyForwardingEmitter extends \OC\Hooks\ForwardingEmitter {
+       public function emitEvent($scope, $method, $arguments = array()) {
+               $this->emit($scope, $method, $arguments);
+       }
+
+       /**
+        * @param \OC\Hooks\Emitter $emitter
+        */
+       public function forward($emitter) {
+               parent::forward($emitter);
+       }
+}
+
+/**
+ * Class ForwardingEmitter
+ *
+ * allows forwarding all listen calls to other emitters
+ *
+ * @package OC\Hooks
+ */
+class ForwardingEmitter extends BasicEmitter {
+       public function testSingleForward() {
+               $baseEmitter = new PublicEmitter();
+               $forwardingEmitter = new DummyForwardingEmitter();
+               $forwardingEmitter->forward($baseEmitter);
+               $hookCalled = false;
+               $forwardingEmitter->listen('Test', 'test', function () use (&$hookCalled) {
+                       $hookCalled = true;
+               });
+               $baseEmitter->emit('Test', 'test');
+               $this->assertTrue($hookCalled);
+       }
+
+       public function testMultipleForwards() {
+               $baseEmitter1 = new PublicEmitter();
+               $baseEmitter2 = new PublicEmitter();
+               $forwardingEmitter = new DummyForwardingEmitter();
+               $forwardingEmitter->forward($baseEmitter1);
+               $forwardingEmitter->forward($baseEmitter2);
+               $hookCalled = 0;
+               $forwardingEmitter->listen('Test', 'test1', function () use (&$hookCalled) {
+                       $hookCalled++;
+               });
+               $forwardingEmitter->listen('Test', 'test2', function () use (&$hookCalled) {
+                       $hookCalled++;
+               });
+               $baseEmitter1->emit('Test', 'test1');
+               $baseEmitter1->emit('Test', 'test2');
+               $this->assertEquals(2, $hookCalled);
+       }
+}