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Efficient non-blocking network and file I/O, for building Node.js-like client/server applications with high performance requirements. It is similar to Event Loop in Node.js. Although Eventloop runs in a single thread, multiple event loops can be launched at the same time allowing for efficient CPU usage.

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package io.datakernel.async.callback;

import io.datakernel.eventloop.Eventloop;
import org.jetbrains.annotations.Nullable;

/**
 * Represents a universal Callback interface
 */
@FunctionalInterface
public interface Callback {
	/**
	 * Performs action upon of completion of Completable computation
	 */
	void accept(T result, @Nullable Throwable e);

	static  Callback toAnotherEventloop(Eventloop anotherEventloop, Callback cb) {
		return (result, e) -> anotherEventloop.execute(() -> cb.accept(result, e));
	}
}