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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.util;

import java.util.concurrent.*;
import java.util.function.Consumer;

/**
 * Utility class with {@link CompletableFuture} and {@link CompletionStage} useful methods.
 *
 * @author Pedro Ruivo
 * @since 5.2
 */
public enum CompletableFutures {
    INSTANCE;

    private static final CompletableFuture NULL = CompletableFuture.completedFuture(null);
    private static final Consumer VOID_CONSUMER = o -> {
    };

    /**
     * Same as {@link #join(CompletableFuture)} but it receives a {@link CompletionStage} as parameter.
     *
     * @see #join(CompletableFuture)
     */
    public static  T join(CompletionStage cs) {
        return join(cs.toCompletableFuture());
    }

    /**
     * Waits for the {@link CompletableFuture} to complete.
     * 
     * Any non {@link RuntimeException} thrown is converted to a {@link RuntimeException}.
     *
     * @param cf  The {@link CompletableFuture}
     * @param  The value type.
     * @return The value of the completed {@link CompletableFuture}.
     */
    public static  T join(CompletableFuture cf) {
        try {
            return cf.join();
        } catch (CompletionException e) {
            if (e.getCause() instanceof RuntimeException) {
                throw (RuntimeException) e.getCause();
            }
            throw new RuntimeException(e.getCause());
        }
    }

    /**
     * A {@code null} completed {@link CompletableFuture}.
     *
     * @param  The value type.
     * @return The {@link  CompletableFuture}.
     */
    public static  CompletableFuture completedNull() {
        //noinspection unchecked
        return (CompletableFuture) NULL;
    }

    /**
     * Consumes any value and return a {@link Void}.
     *
     * @param  The value type.
     * @return The {@link  Consumer}.
     */
    public static  Consumer voidConsumer() {
        //noinspection unchecked
        return (Consumer) VOID_CONSUMER;
    }

}