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Listin g 18-4. Coalesced Temperature Notifications
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[[NSNotificationQueue defaultQueue] enqueueNotification:n postingStyle:NSPostWhenIdle coalesceMask:(NSNotificationCoalescingOnName|NSNotificationCoalescingOnSender) forModes:nil]; Now temperature change events are pushed onto the queue, only to be delivered to their observers when the run loop is idle. If a second or third temperature change notification from the same Thermometer object is posted before the first is delivered, the earlier ones are discarded. Eventually, only the last posted notification is sent to the observers. The forModes: parameter lets you specify the run loop modes that the notification will be delivered in. Normally this is nil or NSDefaultRunLoopMode. Use this if you want notifications to be delivered in a particular mode, like only when the run loop is processing events for a modal dialog. See the Run Loops section of the 15 for more about run loop modes. You can pass the NSNotificationNoCoalescing constant if you want to specify a run loop mode, but no coalescing.
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If you should later change your mind about a notification, it can be removed form the queue if it hasn t yet been delivered. Send the notification queue a -dequeueNotificationsMatching:coalesceMask: message with the notification you want to remove and the constant NSNotificationNoCoalescing. If instead you pass a combination of the coalescing masks described in the Coalescing Notifications section, any other notifications that would be coalesced with that notification will also be removed.
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Distributed Notifications
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Distributed notifications have the ability to send notifications to objects in other processes. They are very similar to regular notifications, with three important differences: The notifications are sent to all processes. Notifications can only include property-list values. Notifications are posted and received asynchronously.
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CHAPTER 18 PROVIDER/SUBSCRIBER PATTERN
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The first feature is what makes distributed notifications so powerful. A single -postNotification message is all that s required to communicate between objects in separate processes, making distributed notifications by far the easiest inter-process communications service available. While the objects can be in different processes, they don t have to be; distributed notifications will be delivered to any local observers as well. The program in Listing 18-5 can be entertaining. It registers to receive all distributed notifications and logs them. Build it as a command-line tool, run it, and then go about using your system. Or use it to test sending notifications from your application. Kill the process to stop it.
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Listin g 18-5. Distributed Notifications Monitor
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#import <Foundation/Foundation.h> #import <AppKit/NSWorkspace.h> @interface DistributedNotificationListener : NSObject - (void)dumpNotification:(NSNotification*)notification; @end @implementation DistributedNotificationListener - (void)dumpNotification:(NSNotification*)notification { NSString* message = [notification name]; id object = [notification object]; NSDictionary* info = [notification userInfo]; if (info!=nil) { NSLog(@"%@ from %@ with %@",message,object,info); } else { if (object!=nil) NSLog(@"%@ from %@",message,object); else NSLog(@"%@",message); } } @end int main (int argc, const char * argv[]) { DistributedNotificationListener *listener; NSDistributedNotificationCenter *center;
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CHAPTER 18 PROVIDER/SUBSCRIBER PATTERN
listener = [DistributedNotificationListener new]; center = [NSDistributedNotificationCenter defaultCenter]; [center addObserver:listener selector:@selector(dumpNotification:) name:nil object:nil]; [[NSRunLoop currentRunLoop] run]; // This never returns: kill the process to stop the program return 0; } To use distributed notifications, you need to be aware of some of its limitations and complications, described in the next few sections.
Distributed Notifications Center
To post or observe distributed notifications, your objects must interact with the singleton NSDistributedNotificationCenter created for each process. You obtain it with [NSDistributed NotificationCenter defaultCenter]. The framework may define other distributed notification centers in the future, but for now there s only one. You cannot create your own distributed notification centers. If you need a more sophisticated inter-process communications path, consider distributed objects, described in 13. Distributed notification centers exchange messages using Mach (kernel) ports. The security model of Mac OS X organizes Mach ports into a hierarchy of bootstrap namespaces. Posted notifications will be broadcast to all of the processes in your account s local and parent namespaces, but not to sister namespaces created by other users.
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