db/update/Service: migrate from DeferredMonitor to DeferEvent

src/db/update/Service.cxx

@@ -40,7 +40,7 @@
 UpdateService::UpdateService(EventLoop &_loop, SimpleDatabase &_db,
 			     CompositeStorage &_storage,
 			     DatabaseListener &_listener)
-	:DeferredMonitor(_loop),
+	:defer(_loop, BIND_THIS_METHOD(RunDeferred)),
 	 db(_db), storage(_storage),
 	 listener(_listener),
 	 update_thread(BIND_THIS_METHOD(Task))
@@ -136,7 +136,7 @@ UpdateService::Task()
 	else
 		LogDebug(update_domain, "finished");
 
-	DeferredMonitor::Schedule();
+	defer.Schedule();
 }
 
 void
@@ -237,7 +237,7 @@ UpdateService::Enqueue(const char *path, bool discard)
  * Called in the main thread after the database update is finished.
  */
 void
-UpdateService::RunDeferred()
+UpdateService::RunDeferred() noexcept
 {
 	assert(next.IsDefined());
 	assert(walk != nullptr);

src/db/update/Service.hxx

@@ -22,7 +22,7 @@
 
 #include "check.h"
 #include "Queue.hxx"
-#include "event/DeferredMonitor.hxx"
+#include "event/DeferEvent.hxx"
 #include "thread/Thread.hxx"
 #include "Compiler.h"
 
@@ -34,7 +34,9 @@ class CompositeStorage;
 /**
  * This class manages the update queue and runs the update thread.
  */
-class UpdateService final : DeferredMonitor {
+class UpdateService final {
+	DeferEvent defer;
+
 	SimpleDatabase &db;
 	CompositeStorage &storage;
 
@@ -61,6 +63,10 @@ public:
 
 	~UpdateService();
 
+	EventLoop &GetEventLoop() noexcept {
+		return defer.GetEventLoop();
+	}
+
 	/**
 	 * Returns a non-zero job id when we are currently updating
 	 * the database.
@@ -93,8 +99,8 @@ public:
 	void CancelMount(const char *uri);
 
 private:
-	/* virtual methods from class DeferredMonitor */
-	virtual void RunDeferred() override;
+	/* DeferEvent callback */
+	void RunDeferred() noexcept;
 
 	/* the update thread */
 	void Task();