chrome: dbus: support asynchronous method replies

dbus/test_service.cc

Index: dbus/test_service.cc
diff --git a/dbus/test_service.cc b/dbus/test_service.cc
index b0207b0e7e9afb14ae4cd1033766855f12b3cdff..ea8e3601b0f12a1f414f7f972bcb0441794f8dd9 100644
--- a/dbus/test_service.cc
+++ b/dbus/test_service.cc
@@ -13,8 +13,8 @@
 
 namespace dbus {
 
-// Echo, SlowEcho, BrokenMethod.
-const int TestService::kNumMethodsToExport = 3;
+// Echo, SlowEcho, AsyncEcho, BrokenMethod.
+const int TestService::kNumMethodsToExport = 4;
 
 TestService::Options::Options() {
 }
@@ -148,6 +148,15 @@ void TestService::Run(MessageLoop* message_loop) {
 
   exported_object_->ExportMethod(
       "org.chromium.TestInterface",
+      "AsyncEcho",
+      base::Bind(&TestService::AsyncEcho,
+                 base::Unretained(this)),
+      base::Bind(&TestService::OnExported,
+                 base::Unretained(this)));
+  ++num_methods;
+
+  exported_object_->ExportMethod(
+      "org.chromium.TestInterface",
       "BrokenMethod",
       base::Bind(&TestService::BrokenMethod,
                  base::Unretained(this)),
@@ -163,25 +172,44 @@ void TestService::Run(MessageLoop* message_loop) {
   message_loop->Run();
 }
 
-Response* TestService::Echo(MethodCall* method_call) {
+void TestService::Echo(MethodCall* method_call,
+                       dbus::ExportedObject::ResponseSender response_sender) {
   MessageReader reader(method_call);
   std::string text_message;
-  if (!reader.PopString(&text_message))
-    return NULL;
+  if (!reader.PopString(&text_message)) {
+    response_sender.Run(NULL);
+    return;
+  }
 
   Response* response = Response::FromMethodCall(method_call);
   MessageWriter writer(response);
   writer.AppendString(text_message);
-  return response;
+  response_sender.Run(response);
 }
 
-Response* TestService::SlowEcho(MethodCall* method_call) {
+void TestService::SlowEcho(
+    MethodCall* method_call,
+    dbus::ExportedObject::ResponseSender response_sender) {
   base::PlatformThread::Sleep(TestTimeouts::tiny_timeout_ms());
-  return Echo(method_call);
+  Echo(method_call, response_sender);
+}
+
+void TestService::AsyncEcho(
+    MethodCall* method_call,
+    dbus::ExportedObject::ResponseSender response_sender) {
+  // Schedule a call to Echo() to send an asynchronous response after we return.
+  message_loop()->PostDelayedTask(FROM_HERE,
+                                  base::Bind(&TestService::Echo,
+                                             base::Unretained(this),
+                                             method_call,
+                                             response_sender),
+                                  TestTimeouts::tiny_timeout_ms());
 }
 
-Response* TestService::BrokenMethod(MethodCall* method_call) {
-  return NULL;
+void TestService::BrokenMethod(
+    MethodCall* method_call,
+    dbus::ExportedObject::ResponseSender response_sender) {
+  response_sender.Run(NULL);
 }
 
 }  // namespace dbus