122 lines
2.9 KiB
V
122 lines
2.9 KiB
V
module eventbus
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pub type EventHandlerFn = fn (receiver voidptr, args voidptr, sender voidptr)
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pub struct Publisher {
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mut:
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registry &Registry
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}
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pub struct Subscriber {
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mut:
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registry &Registry
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}
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struct Registry {
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mut:
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events []EventHandler
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}
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struct EventHandler {
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name string
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handler EventHandlerFn
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receiver voidptr = voidptr(0)
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once bool
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}
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pub struct EventBus {
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pub mut:
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registry &Registry
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publisher &Publisher
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subscriber &Subscriber
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}
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pub fn new() &EventBus {
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registry := &Registry{
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events: []
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}
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return &EventBus{registry, &Publisher{registry}, &Subscriber{registry}}
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}
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// EventBus Methods
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pub fn (eb &EventBus) publish(name string, sender voidptr, args voidptr) {
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mut publisher := eb.publisher
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publisher.publish(name, sender, args)
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}
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pub fn (eb &EventBus) clear_all() {
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mut publisher := eb.publisher
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publisher.clear_all()
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}
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pub fn (eb &EventBus) has_subscriber(name string) bool {
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return eb.registry.check_subscriber(name)
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}
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// Publisher Methods
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fn (mut pb Publisher) publish(name string, sender voidptr, args voidptr) {
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for event in pb.registry.events {
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if event.name == name {
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event.handler(event.receiver, args, sender)
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}
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}
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pb.registry.events = pb.registry.events.filter(!(it.name == name && it.once))
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}
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fn (mut p Publisher) clear_all() {
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p.registry.events.clear()
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}
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// Subscriber Methods
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pub fn (mut s Subscriber) subscribe(name string, handler EventHandlerFn) {
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s.registry.events << EventHandler{
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name: name
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handler: handler
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}
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}
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pub fn (mut s Subscriber) subscribe_method(name string, handler EventHandlerFn, receiver voidptr) {
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s.registry.events << EventHandler{
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name: name
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handler: handler
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receiver: receiver
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}
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}
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// unsubscribe_method unsubscribe a receiver for only one method
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pub fn (mut s Subscriber) unsubscribe_method(name string, receiver voidptr) {
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s.registry.events = s.registry.events.filter(!(it.name == name && it.receiver == receiver))
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}
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// unsubscribe_receiver unsubscribes a receiver from all events
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pub fn (mut s Subscriber) unsubscribe_receiver(receiver voidptr) {
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s.registry.events = s.registry.events.filter(it.receiver != receiver)
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}
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pub fn (mut s Subscriber) subscribe_once(name string, handler EventHandlerFn) {
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s.registry.events << EventHandler{
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name: name
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handler: handler
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once: true
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}
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}
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pub fn (s &Subscriber) is_subscribed(name string) bool {
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return s.registry.check_subscriber(name)
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}
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// is_subscribed_method checks whether a receiver was already subscribed for any events
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pub fn (s &Subscriber) is_subscribed_method(name string, receiver voidptr) bool {
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return s.registry.events.any(it.name == name && it.receiver == receiver)
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}
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pub fn (mut s Subscriber) unsubscribe(name string, handler EventHandlerFn) {
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// v := voidptr(handler)
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s.registry.events = s.registry.events.filter(!(it.name == name && it.handler == handler))
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}
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// Registry Methods
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fn (r &Registry) check_subscriber(name string) bool {
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return r.events.any(it.name == name)
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}
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