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/*
* SPDX-FileCopyrightText: 2023 Linnea Gräf <nea@nea.moe>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
package moe.nea.firmament.events
import java.util.concurrent.CopyOnWriteArrayList
import moe.nea.firmament.Firmament
/**
* A pubsub event bus.
*
* [subscribe] to events [publish]ed on this event bus.
* Subscriptions may not necessarily be delivered in the order of registering.
*/
open class FirmamentEventBus<T : FirmamentEvent> {
data class Handler<T>(
val invocation: (T) -> Unit, val receivesCancelled: Boolean,
var knownErrors: MutableSet<Class<*>> = mutableSetOf(),
)
private val toHandle: MutableList<Handler<T>> = CopyOnWriteArrayList()
fun subscribe(handle: (T) -> Unit) {
subscribe(false, handle)
}
fun subscribe(receivesCancelled: Boolean, handle: (T) -> Unit) {
toHandle.add(Handler(handle, receivesCancelled))
}
fun publish(event: T): T {
for (function in toHandle) {
if (function.receivesCancelled || event !is FirmamentEvent.Cancellable || !event.cancelled) {
try {
function.invocation(event)
} catch (e: Exception) {
val klass = e.javaClass
if (!function.knownErrors.contains(klass) || Firmament.DEBUG) {
function.knownErrors.add(klass)
Firmament.logger.error("Caught exception during processing event $event by $function", e)
}
}
}
}
return event
}
}
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