Register @Listen annotated classes in Http and Ssh modules

Current implementation of Web UI plugins allows auto register them using
@Listen annotation. Unfortunately listeners can only be bind in
system module.

This patch enables binding listeners in Http and Ssh modules.

Change-Id: I7569d0e743bd9e1c9bb8aded09a5740bb88c1cca
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>

gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpAutoRegisterModuleGenerator.java

@@ -14,14 +14,20 @@
 
 package com.google.gerrit.httpd.plugins;
 
+import static com.google.gerrit.server.plugins.AutoRegisterUtil.calculateBindAnnotation;
+
+import com.google.common.collect.LinkedListMultimap;
 import com.google.common.collect.Maps;
+import com.google.common.collect.Multimap;
 import com.google.gerrit.extensions.annotations.Export;
 import com.google.gerrit.server.plugins.InvalidPluginException;
 import com.google.gerrit.server.plugins.ModuleGenerator;
 import com.google.inject.Module;
 import com.google.inject.Scopes;
+import com.google.inject.TypeLiteral;
 import com.google.inject.servlet.ServletModule;
 
+import java.lang.annotation.Annotation;
 import java.util.Map;
 
 import javax.servlet.http.HttpServlet;
@@ -29,6 +35,7 @@ import javax.servlet.http.HttpServlet;
 class HttpAutoRegisterModuleGenerator extends ServletModule
     implements ModuleGenerator {
   private final Map<String, Class<HttpServlet>> serve = Maps.newHashMap();
+  private final Multimap<TypeLiteral<?>, Class<?>> listeners = LinkedListMultimap.create();
 
   @Override
   protected void configureServlets() {
@@ -36,6 +43,16 @@ class HttpAutoRegisterModuleGenerator extends ServletModule
       bind(e.getValue()).in(Scopes.SINGLETON);
       serve(e.getKey()).with(e.getValue());
     }
+    for (Map.Entry<TypeLiteral<?>, Class<?>> e : listeners.entries()) {
+      @SuppressWarnings("unchecked")
+      TypeLiteral<Object> type = (TypeLiteral<Object>) e.getKey();
+
+      @SuppressWarnings("unchecked")
+      Class<Object> impl = (Class<Object>) e.getValue();
+
+      Annotation n = calculateBindAnnotation(impl);
+      bind(type).annotatedWith(n).to(impl);
+    }
   }
 
   @Override
@@ -62,6 +79,11 @@ class HttpAutoRegisterModuleGenerator extends ServletModule
     }
   }
 
+  @Override
+  public void listen(TypeLiteral<?> tl, Class<?> clazz) {
+    listeners.put(tl, clazz);
+  }
+
   @Override
   public Module create() throws InvalidPluginException {
     return this;