com.vaadin.collaborationengine.EventUtil Maven / Gradle / Ivy
/*
* Copyright (C) 2021 Vaadin Ltd
*
* This program is available under Commercial Vaadin Runtime License 1.0
* (CVRLv1).
*
* For the full License, see http://vaadin.com/license/cvrl-1
*/
package com.vaadin.collaborationengine;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
/**
* @author Vaadin Ltd
* @since 1.0
*/
class EventUtil {
private EventUtil() {
// Only static helpers
}
/**
* Runs the given action for each listener in a list and collects any
* runtime exceptions. If any listener throws an exception, then the
* exception is rethrown after iteration completes. If multiple exceptions
* are thrown, then subsequent exceptions are set as suppressed exceptions
* of the first exception which is thrown at the end.
*
* Listeners for which an exception is thrown can optionally be removed from
* the list of listeners.
*
* @param
* the listener type
* @param listeners
* the list of listeners, or null to gracefully not
* invoke any listeners
* @param action
* the action to used to invoke the listener, not
* null
* @param removeFailingListeners
* true to remove failing listeners from the list,
* false to not modify the list of listeners
*
* @since 1.0
*/
static void fireEvents(List listeners, Consumer action,
boolean removeFailingListeners) {
assert action != null;
if (listeners == null) {
return;
}
RuntimeException firstException = null;
for (T listener : new ArrayList<>(listeners)) {
try {
action.accept(listener);
} catch (RuntimeException e) {
if (removeFailingListeners) {
listeners.remove(listener);
}
if (firstException == null) {
firstException = e;
} else {
firstException.addSuppressed(e);
}
}
}
if (firstException != null) {
throw firstException;
}
}
}