com.github.twitch4j.common.util.EventManagerUtils Maven / Gradle / Ivy
package com.github.twitch4j.common.util;
import com.github.philippheuer.events4j.api.service.IEventHandler;
import com.github.philippheuer.events4j.core.EventManager;
import lombok.extern.slf4j.Slf4j;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
@Slf4j
public class EventManagerUtils {
/**
* Validates the provided EventManager or initializes a new one
*
* @param eventManager EventManager
* @param defaultEventHandler The default eventHandler class
* @return EventManager
*/
public static EventManager validateOrInitializeEventManager(@Nullable EventManager eventManager, @NotNull Class defaultEventHandler) {
EventManager em = eventManager != null ? eventManager : initializeEventManager(defaultEventHandler);
validateEventManager(em);
return em;
}
/**
* Initializes a new EventManager instance.
*
* @param defaultEventHandler The default eventHandler class
* @return EventManager
*/
public static EventManager initializeEventManager(@NotNull Class defaultEventHandler) {
EventManager eventManager = new EventManager();
// Try to register just defaultEventHandler
try {
eventManager.registerEventHandler((IEventHandler) defaultEventHandler.getDeclaredConstructor().newInstance());
eventManager.setDefaultEventHandler(defaultEventHandler);
} catch (Exception e) {
log.warn("Failed to register the requested default event handler: " + defaultEventHandler, e);
}
// Fallback
if (eventManager.getDefaultEventHandler() == null) {
eventManager.autoDiscovery();
if (!eventManager.getEventHandlers().isEmpty()) {
Class clazz = eventManager.getEventHandlers().get(0).getClass();
eventManager.setDefaultEventHandler(clazz);
log.info("Registered fallback default event handler: {}", clazz.getTypeName());
}
}
return eventManager;
}
/**
* Checks if the provided EventManager is usable by Twitch4J
*
* @param eventManager The eventManager instance
*/
public static void validateEventManager(@NotNull EventManager eventManager) {
if (eventManager.getEventHandlers().size() == 0) {
throw new RuntimeException("Fatal: No EventHandlers have been registered in the EventManager, please run the autodiscovery to add EventHandlers that are present in your classpath. -> eventHandler.autoDiscovery();");
}
if (eventManager.getDefaultEventHandler() == null) {
throw new RuntimeException("Fatal: Twitch4J will not be functional unless you set a defaultEventHandler that can be used for internal events (eventManager.setDefaultEventHandler)!");
}
}
}