1 files changed, 39 insertions, 0 deletions
diff --git a/brillo/dbus/dbus_service_watcher.cc b/brillo/dbus/dbus_service_watcher.cc
new file mode 100644
index 0000000..ede2e6e
--- /dev/null
+++ b/brillo/dbus/dbus_service_watcher.cc
@@ -0,0 +1,39 @@
+// Copyright 2015 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <brillo/dbus/dbus_service_watcher.h>
+
+#include <base/bind.h>
+
+namespace brillo {
+namespace dbus_utils {
+
+DBusServiceWatcher::DBusServiceWatcher(
+    scoped_refptr<dbus::Bus> bus,
+    const std::string& connection_name,
+    const base::Closure& on_connection_vanish)
+    : bus_{bus},
+      connection_name_{connection_name},
+      on_connection_vanish_{on_connection_vanish} {
+  monitoring_callback_ = base::Bind(
+      &DBusServiceWatcher::OnServiceOwnerChange, weak_factory_.GetWeakPtr());
+  // Register to listen, and then request the current owner;
+  bus_->ListenForServiceOwnerChange(connection_name_, monitoring_callback_);
+  bus_->GetServiceOwner(connection_name_, monitoring_callback_);
+}
+
+DBusServiceWatcher::~DBusServiceWatcher() {
+  bus_->UnlistenForServiceOwnerChange(
+      connection_name_, monitoring_callback_);
+}
+
+void DBusServiceWatcher::OnServiceOwnerChange(
+    const std::string& service_owner) {
+  if (service_owner.empty()) {
+    on_connection_vanish_.Run();
+  }
+}
+
+}  // namespace dbus_utils
+}  // namespace brillo