BMediaRoster: Add B_MEDIA_SERVER_STARTED and B_MEDIA_SERVER_QUIT

* This is done by watching to registrar notifications
  and providing a minimal service to contact the
  media roster in private API. The roster use this
  service to automatically reconnect to the media_server.

headers/os/media/MediaDefs.h

@@ -47,8 +47,10 @@ enum {
 	B_MEDIA_NEW_PARAMETER_VALUE,	/* N "node", "parameter", "when", */
 									/* "value" */
 	B_MEDIA_NODE_STOPPED,			/* N "node", "when" */
-	B_MEDIA_FLAVORS_CHANGED			/* "be:addon_id", "be:new_count", */
+	B_MEDIA_FLAVORS_CHANGED,		/* "be:addon_id", "be:new_count", */
 									/* "be:gone_count" */
+	B_MEDIA_SERVER_STARTED,
+	B_MEDIA_SERVER_QUIT
 };
 
 

headers/private/media/DataExchange.h

@@ -16,7 +16,11 @@ namespace media {
 namespace dataexchange {
 
 
-void InitDataExchange();
+void InitServerDataExchange();
+void InitRosterDataExchange(const BMessenger& rosterMessenger);
+
+// BMessage based data exchange with the current BMediaRoster
+status_t SendToRoster(BMessage* msg);
 
 // BMessage based data exchange with the media_server
 status_t SendToServer(BMessage* msg);

headers/private/media/MediaRosterEx.h

@@ -88,6 +88,8 @@ public:
 
 		BTimeSource*		MakeTimeSourceObject(media_node_id timesource_id);
 
+		status_t			BuildConnections();
+
 private:
 	friend class BMediaRoster;
 };

headers/private/media/ServerInterface.h

@@ -32,6 +32,12 @@ enum {
 	MEDIA_ADD_ON_SERVER_PLAY_MEDIA = '_TRU'
 };
 
+enum {
+	// local media services status notification service
+	MEDIA_ROSTER_REQUEST_NOTIFICATIONS = 2000,
+	MEDIA_ROSTER_CANCEL_NOTIFICATIONS
+};
+
 // Raw port based communication
 enum {
 	GENERAL_PURPOSE_WAKEUP = 0,	// when no action but wait termination needed

src/kits/media/DataExchange.cpp

@@ -25,6 +25,7 @@ namespace dataexchange {
 
 
 static BMessenger sMediaServerMessenger;
+static BMessenger sMediaRosterMessenger;
 static port_id sMediaServerPort;
 static port_id sMediaAddonServerPort;
 
@@ -58,7 +59,7 @@ find_media_addon_server_port()
 
 
 void
-InitDataExchange()
+InitServerDataExchange()
 {
 	sMediaServerMessenger = BMessenger(B_MEDIA_SERVER_SIGNATURE);
 	find_media_server_port();
@@ -66,6 +67,27 @@ InitDataExchange()
 }
 
 
+void
+InitRosterDataExchange(const BMessenger& rosterMessenger)
+{
+	sMediaRosterMessenger = rosterMessenger;
+}
+
+
+//! BMessage based data exchange with the local BMediaRoster
+status_t
+SendToRoster(BMessage* msg)
+{
+	status_t status = sMediaRosterMessenger.SendMessage(msg,
+		static_cast<BHandler*>(NULL), TIMEOUT);
+	if (status != B_OK) {
+		ERROR("SendToRoster: SendMessage failed: %s\n", strerror(status));
+		DEBUG_ONLY(msg->PrintToStream());
+	}
+	return status;
+}
+
+
 //! BMessage based data exchange with the media_server
 status_t
 SendToServer(BMessage* msg)

src/kits/media/MediaRoster.cpp

@@ -59,14 +59,15 @@ char __dont_remove_copyright_from_binary[] = "Copyright (c) 2002-2006 Marcus "
 
 #include <AppMisc.h>
 
-#include <debug.h>
 #include <DataExchange.h>
+#include <debug.h>
 #include <DormantNodeManager.h>
-#include <MediaRosterEx.h>
 #include <MediaMisc.h>
+#include <MediaRosterEx.h>
 #include <Notifications.h>
 #include <ServerInterface.h>
 #include <SharedBufferList.h>
+#include <TList.h>
 
 #include "TimeSourceObjectManager.h"
 
@@ -75,6 +76,14 @@ namespace BPrivate {
 namespace media {
 
 
+struct RosterNotification {
+	BMessenger	messenger;
+	int32		what;
+};
+
+static bool sServerIsUp = false;
+static List<RosterNotification> sNotificationList;
+
 // This class is provided to ensure the BMediaRoster is quit.
 class MediaRosterUndertaker {
 public:
@@ -101,11 +110,25 @@ BMediaRosterEx::BMediaRosterEx(status_t* _error)
 	:
 	BMediaRoster()
 {
-	InitDataExchange();
-
 	gDormantNodeManager = new DormantNodeManager;
 	gTimeSourceObjectManager = new TimeSourceObjectManager;
 
+	*_error = BuildConnections();
+
+	InitRosterDataExchange(BMessenger(this, this));
+
+	if (be_roster->StartWatching(BMessenger(this, this),
+		B_REQUEST_LAUNCHED | B_REQUEST_QUIT) != B_OK)
+			*_error = B_ERROR;
+
+	sServerIsUp = BMediaRoster::IsRunning();
+}
+
+
+status_t
+BMediaRosterEx::BuildConnections()
+{
+	InitServerDataExchange();
 	// register this application with the media server
 	server_register_app_request request;
 	server_register_app_reply reply;
@@ -115,9 +138,9 @@ BMediaRosterEx::BMediaRosterEx(status_t* _error)
 	status_t status = QueryServer(SERVER_REGISTER_APP, &request,
 		sizeof(request), &reply, sizeof(reply));
 	if (status != B_OK)
-		*_error = B_MEDIA_SYSTEM_FAILURE;
-	else
-		*_error = B_OK;
+		return B_MEDIA_SYSTEM_FAILURE;
+
+	return B_OK;
 }
 
 
@@ -1902,6 +1925,10 @@ BMediaRoster::StartWatching(const BMessenger & where, int32 notificationType)
 		ERROR("BMediaRoster::StartWatching: notificationType invalid!\n");
 		return B_BAD_VALUE;
 	}
+
+	// NOTE: we support only explicitly B_MEDIA_SERVER_STARTED/QUIT
+	// notifications. This should be cleared in documentation.
+
 	return BPrivate::media::notifications::Register(where, media_node::null,
 		notificationType);
 }
@@ -3308,6 +3335,119 @@ BMediaRoster::MessageReceived(BMessage* message)
 			return;
 		}
 
+		case MEDIA_ROSTER_REQUEST_NOTIFICATIONS:
+		{
+			RosterNotification notification;
+			if (message->FindInt32(NOTIFICATION_PARAM_WHAT, &notification.what)
+				!= B_OK) {
+				TRACE("BMediaRoster MEDIA_ROSTER_REQUEST_NOTIFICATIONS can't"
+					"find what parameter");
+				return;
+			}
+			if (message->FindMessenger(NOTIFICATION_PARAM_MESSENGER,
+				&notification.messenger) != B_OK) {
+				TRACE("BMediaRoster MEDIA_ROSTER_REQUEST_NOTIFICATIONS can't"
+					"find messenger");
+				return;
+			}
+			sNotificationList.Insert(notification);
+			return;
+		}
+
+		case MEDIA_ROSTER_CANCEL_NOTIFICATIONS:
+		{
+			RosterNotification notification;
+			if (message->FindInt32(NOTIFICATION_PARAM_WHAT, &notification.what)
+				!= B_OK) {
+				TRACE("BMediaRoster MEDIA_ROSTER_CANCEL_NOTIFICATIONS can't"
+					"find what parameter");
+				return;
+			}
+			if (message->FindMessenger(NOTIFICATION_PARAM_MESSENGER,
+				&notification.messenger) != B_OK) {
+				TRACE("BMediaRoster MEDIA_ROSTER_CANCEL_NOTIFICATIONS can't"
+					"find messenger");
+				return;
+			}
+			for (int32 i = 0; i < sNotificationList.CountItems(); i++) {
+				RosterNotification* current;
+				if (sNotificationList.Get(i, &current) != true)
+					return;
+				if (current->what == notification.what
+					&& current->messenger == notification.messenger) {
+					sNotificationList.Remove(i);
+					return;
+				}
+			}
+			return;
+		}
+
+		case B_SOME_APP_LAUNCHED:
+		{
+			BString mimeSig;
+			if (message->FindString("be:signature", &mimeSig) != B_OK)
+				return;
+			if (mimeSig != B_MEDIA_ADDON_SERVER_SIGNATURE
+					&& mimeSig != B_MEDIA_SERVER_SIGNATURE)
+				return;
+
+			TRACE("BMediaRoster::MessageReceived media services are going up.");
+
+			// Send the notification to our subscribers
+			if (BMediaRoster::IsRunning()) {
+				sServerIsUp = true;
+				// Restore our friendship with the media servers
+				if (MediaRosterEx(this)->BuildConnections() != B_OK) {
+					TRACE("BMediaRoster::MessageReceived can't reconnect"
+						"to media_server.");
+				}
+
+				for (int32 i = 0; i < sNotificationList.CountItems(); i++) {
+					RosterNotification* current;
+					if (sNotificationList.Get(i, &current) != true)
+						return;
+					if (current->what == B_MEDIA_SERVER_STARTED) {
+						if (current->messenger.SendMessage(
+							B_MEDIA_SERVER_STARTED) != B_OK) {
+							if(!current->messenger.IsValid())
+								sNotificationList.Remove(i);
+						}
+					}
+				}
+			}
+			return;
+		}
+
+		case B_SOME_APP_QUIT:
+		{
+			BString mimeSig;
+			if (message->FindString("be:signature", &mimeSig) != B_OK)
+				return;
+			if (mimeSig != B_MEDIA_ADDON_SERVER_SIGNATURE
+					&& mimeSig != B_MEDIA_SERVER_SIGNATURE)
+				return;
+
+			TRACE("BMediaRoster::MessageReceived media services are down.");
+
+			// Send the notification to our subscribers
+			if (!BMediaRoster::IsRunning() && sServerIsUp == true) {
+				sServerIsUp = false;
+				for (int32 i = 0; i < sNotificationList.CountItems(); i++) {
+					RosterNotification* current;
+					if (sNotificationList.Get(i, &current) != true)
+						return;
+					if (current->what == B_MEDIA_SERVER_QUIT) {
+						if (current->messenger.SendMessage(
+							B_MEDIA_SERVER_QUIT) != B_OK) {
+							if(!current->messenger.IsValid())
+								sNotificationList.Remove(i);
+						}
+					}
+				}
+			}
+			return;
+		}
+
 		case NODE_FINAL_RELEASE:
 		{
 			// this function is called by a BMediaNode to delete
@@ -3338,7 +3478,14 @@ BMediaRoster::MessageReceived(BMessage* message)
 bool
 BMediaRoster::QuitRequested()
 {
-	UNIMPLEMENTED();
+	CALLED();
+
+	if (be_roster->StopWatching(BMessenger(this, this)) != B_OK)
+			TRACE("Can't unregister roster notifications");
+
+	if (sNotificationList.CountItems() != 0)
+		sNotificationList.MakeEmpty();
+
 	return true;
 }
 

src/kits/media/Notifications.cpp

@@ -58,6 +58,15 @@ Register(const BMessenger& notifyHandler, const media_node& node,
 	int32 notification)
 {
 	CALLED();
+
+	if (notification == B_MEDIA_SERVER_STARTED
+		|| notification == B_MEDIA_SERVER_QUIT) {
+		BMessage msg(MEDIA_ROSTER_REQUEST_NOTIFICATIONS);
+		msg.AddInt32(NOTIFICATION_PARAM_WHAT, notification);
+		msg.AddMessenger(NOTIFICATION_PARAM_MESSENGER, notifyHandler);
+		return BPrivate::media::dataexchange::SendToRoster(&msg);
+	}
+
 	BMessage msg(MEDIA_SERVER_REQUEST_NOTIFICATIONS);
 	msg.AddInt32(NOTIFICATION_PARAM_WHAT, notification);
 	msg.AddInt32(NOTIFICATION_PARAM_TEAM, BPrivate::current_team());
@@ -73,6 +82,15 @@ Unregister(const BMessenger& notifyHandler, const media_node& node,
 	int32 notification)
 {
 	CALLED();
+
+	if (notification == B_MEDIA_SERVER_STARTED
+		|| notification == B_MEDIA_SERVER_QUIT) {
+		BMessage msg(MEDIA_ROSTER_CANCEL_NOTIFICATIONS);
+		msg.AddInt32(NOTIFICATION_PARAM_WHAT, notification);
+		msg.AddMessenger(NOTIFICATION_PARAM_MESSENGER, notifyHandler);
+		return BPrivate::media::dataexchange::SendToRoster(&msg);
+	}
+
 	BMessage msg(MEDIA_SERVER_CANCEL_NOTIFICATIONS);
 	msg.AddInt32(NOTIFICATION_PARAM_WHAT, notification);
 	msg.AddInt32(NOTIFICATION_PARAM_TEAM, BPrivate::current_team());
@@ -295,6 +313,11 @@ IsValidNotificationRequest(bool node_specific, int32 notification)
 		case B_MEDIA_FLAVORS_CHANGED:
 			return true;
 
+		// invalid if we watch for a specific node
+		case B_MEDIA_SERVER_STARTED:
+		case B_MEDIA_SERVER_QUIT:
+			return !node_specific;
+
 		// only valid for node specific watching
 		case B_MEDIA_PARAMETER_CHANGED:
 		case B_MEDIA_FORMAT_CHANGED: