add some framework to broadcast and manage notification messages

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1301 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/media/NotificationProcessor.cpp

@@ -0,0 +1,67 @@
+#include <OS.h>
+#include <Message.h>
+#include "NotificationProcessor.h"
+#include "Queue.h"
+
+#define NOTIFICATION_THREAD_PRIORITY 19
+
+NotificationProcessor::NotificationProcessor()
+ :	fNotificationQueue(new Queue),
+	fNotificationThreadId(-1)
+{
+	fNotificationThreadId = spawn_thread(NotificationProcessor::worker_thread, "notification broadcast", NOTIFICATION_THREAD_PRIORITY, this);
+	resume_thread(fNotificationThreadId);
+}
+
+NotificationProcessor::~NotificationProcessor()
+{
+	// properly terminate the queue and wait until the worker thread has finished
+	status_t dummy;
+	fNotificationQueue->Terminate();
+	wait_for_thread(fNotificationThreadId, &dummy);
+	delete fNotificationQueue;
+}
+
+void
+NotificationProcessor::RequestNotifications(BMessage *msg)
+{
+}
+
+void
+NotificationProcessor::CancelNotifications(BMessage *msg)
+{
+}
+
+void
+NotificationProcessor::SendNotifications(BMessage *msg)
+{
+	// queue a copy of the message to be processed later
+	fNotificationQueue->AddItem(new BMessage(*msg));
+}
+	
+void
+NotificationProcessor::CleanupTeam(team_id team)
+{
+}
+
+void
+NotificationProcessor::BroadcastMessages(BMessage *msg)
+{
+}
+
+void
+NotificationProcessor::WorkerThread()
+{
+	BMessage *msg;
+	while (NULL != (msg = static_cast<BMessage *>(fNotificationQueue->RemoveItem()))) {
+		BroadcastMessages(msg);
+		delete msg;
+	}
+}
+
+int32
+NotificationProcessor::worker_thread(void *arg)
+{
+	static_cast<NotificationProcessor *>(arg)->WorkerThread();
+	return 0;
+}