#JLTEventBus
JLTEventBus is based on Guava EventBus.
##Events
Events are classes or protocols. Unlike NSNotification where the notification is identified as a string, events are identified by their type.
@interface UserDidChange : NSObject
@property (nonatomic) User *currentUser;
@property (nonatomic) User *previousUser;
@end
##Register For Events
[[JLTEventBus defaultBus] registerEventHandler:eventHandler]
This registers all the methods in eventHandler named -on<Event>: as callbacks on the default bus.
###Register Sample
In this sample, a class is created which handles the UserDidChange event. When an instance of the class is created, the instance registers itself as an event handler on the default bus. When the instance is released, it unregisters itself as a handler.
@interface UserMonitor : NSObject
- (void)onUserDidChange:(UserDidChange *)event;
@end
@implementation UserMonitor
- (void)onUserDidChange:(UserDidChange *)event
{
NSLog(@"The user changed from %@ to %@", event.previousUser, event.currentUser);
}
- (id)init
{
self = [super init];
if (self) {
[[JLTEventBus defaultBus] registerEventHandler:self];
}
return self;
}
- (void)dealloc
{
[[JLTEventBus defaultBus] unregisterEventHandler:self];
}
@end
##Posting Events
[[JLTEventBus defaultBus] postEvent:[Event new]]
This sends an instance of the event object to each handler that's been registered on the default bus.
###Post Sample
In this sample, the -setUser:(User *)user method posts a UserDidChange event.
- (void)setUser:(User *)user
{
if (_user != user) {
User *previousUser = _user;
_user = user;
UserDidChange *event = [UserDidChange new];
event.currentUser = user;
event.previousUser = previousUser;
[[JLTEventBus defaultBus] postEvent:event];
}
}
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