Make Zend\Loader soft dependency

src/Listener/DefaultListenerAggregate.php

@@ -43,10 +43,17 @@ public function attach(EventManagerInterface $events)
         $locatorRegistrationListener = new LocatorRegistrationListener($options);
 
         // High priority, we assume module autoloading (for FooNamespace\Module classes) should be available before anything else
-        $this->listeners[] = $events->attach(new ModuleLoaderListener($options));
+        if ($options->getUseZendLoader()) {
+            // Register listener only if Zend\Loader is used, otherwise depend
+            // on other means of module autoloading. Eg Composer
+            $this->listeners[] = $events->attach(new ModuleLoaderListener($options));
+        }
         $this->listeners[] = $events->attach(ModuleEvent::EVENT_LOAD_MODULE_RESOLVE, new ModuleResolverListener);
-        // High priority, because most other loadModule listeners will assume the module's classes are available via autoloading
-        $this->listeners[] = $events->attach(ModuleEvent::EVENT_LOAD_MODULE, new AutoloaderListener($options), 9000);
+        if ($options->getUseZendLoader()) {
+            // Only listen for AutoloaderProvider feature if Zend\Loader is used.
+            // High priority, because most other loadModule listeners will assume the module's classes are available via autoloading
+            $this->listeners[] = $events->attach(ModuleEvent::EVENT_LOAD_MODULE, new AutoloaderListener($options), 9000);
+        }
 
         if ($options->getCheckDependencies()) {
             $this->listeners[] = $events->attach(ModuleEvent::EVENT_LOAD_MODULE, new ModuleDependencyCheckerListener, 8000);

src/Listener/ListenerOptions.php

@@ -67,6 +67,11 @@ class ListenerOptions extends AbstractOptions
      */
     protected $moduleMapCacheKey;
 
+    /**
+     * @var bool
+     */
+    protected $useZendLoader = true;
+
     /**
      * Get an array of paths where modules reside
      *
@@ -381,6 +386,27 @@ public function setCheckDependencies($checkDependencies)
         return $this;
     }
 
+    public function getUseZendLoader()
+    {
+        return $this->useZendLoader;
+    }
+
+    /**
+     * Set if the module manager should use Zend\Loader
+     *
+     * Setting this option to false will disable ModuleAutoloader, requiring
+     * other means of autoloading to be used. Eg Composer.
+     * AutoloaderProvider feature will be disabled as well
+     *
+     * @param  bool $flag
+     * @return ListenerOptions
+     */
+    public function setUseZendLoader($flag)
+    {
+        $this->useZendLoader = (bool) $flag;
+        return $this;
+    }
+
     /**
      * Normalize a path for insertion in the stack
      *

test/Listener/DefaultListenerAggregateTest.php

@@ -112,4 +112,47 @@ public function testDefaultListenerAggregateCanDetachItself()
         $listenerAggregate->detach($moduleManager->getEventManager());
         $this->assertEquals(1, count($moduleManager->getEventManager()->getEvents()));
     }
+
+    public function testDefaultListenerAggregateSkipsAutoloadingListenersIfZendLoaderIsNotUsed()
+    {
+        $moduleManager = new ModuleManager(['ListenerTestModule']);
+        $moduleManager->getEventManager()->attachAggregate(
+            new DefaultListenerAggregate(new ListenerOptions([
+                'use_zend_loader' => false,
+            ]))
+        );
+
+        $events = $moduleManager->getEventManager()->getEvents();
+        $expectedEvents = [
+            'loadModules' => [
+                'config-pre' => 'Zend\ModuleManager\Listener\ConfigListener',
+                'config-post' => 'Zend\ModuleManager\Listener\ConfigListener',
+                'Zend\ModuleManager\Listener\LocatorRegistrationListener',
+                'Zend\ModuleManager\ModuleManager',
+            ],
+            'loadModule.resolve' => [
+                'Zend\ModuleManager\Listener\ModuleResolverListener',
+            ],
+            'loadModule' => [
+                'Zend\ModuleManager\Listener\ModuleDependencyCheckerListener',
+                'Zend\ModuleManager\Listener\InitTrigger',
+                'Zend\ModuleManager\Listener\OnBootstrapListener',
+                'Zend\ModuleManager\Listener\ConfigListener',
+                'Zend\ModuleManager\Listener\LocatorRegistrationListener',
+            ],
+        ];
+        foreach ($expectedEvents as $event => $expectedListeners) {
+            $this->assertContains($event, $events);
+            $listeners = $moduleManager->getEventManager()->getListeners($event);
+            $this->assertSame(count($expectedListeners), count($listeners));
+            foreach ($listeners as $listener) {
+                $callback = $listener->getCallback();
+                if (is_array($callback)) {
+                    $callback = $callback[0];
+                }
+                $listenerClass = get_class($callback);
+                $this->assertContains($listenerClass, $expectedListeners);
+            }
+        }
+    }
 }