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/*
* Firmament is a Hypixel Skyblock mod for modern Minecraft versions
* Copyright (C) 2023 Linnea Gräf
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
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 or registering.
*/
open class FirmamentEventBus<T : FirmamentEvent> {
data class Handler<T>(val invocation: (T) -> Unit, val receivesCancelled: Boolean)
private val toHandle: MutableList<Handler<T>> = CopyOnWriteArrayList()
fun subscribe(handle: (T) -> Unit) {
subscribe(handle, false)
}
fun subscribe(handle: (T) -> Unit, receivesCancelled: Boolean) {
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) {
Firmament.logger.error("Caught exception during processing event $event", e)
}
}
}
return event
}
}
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