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This packages contains the building blocks required to create the drasyl overlay network.

There is a newer version: 0.10.0

/*
 * Copyright (c) 2020-2021 Heiko Bornholdt and Kevin Röbert
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
 * OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.drasyl.util;

import io.netty.util.concurrent.Future;

import java.util.concurrent.CompletableFuture;

import static java.util.Objects.requireNonNull;
import static java.util.concurrent.CompletableFuture.completedFuture;
import static java.util.concurrent.CompletableFuture.failedFuture;

/**
 * Utility class for future-related operations.
 */
public final class FutureUtil {
    private FutureUtil() {
        // util class
    }

    /**
     * Translates the Netty {@link Future} to a {@link CompletableFuture}.
     *
     * @param future The future to be translated
     * @param     The result type of the future
     * @return The translated {@link CompletableFuture}
     */
    public static  CompletableFuture toFuture(final Future future) {
        requireNonNull(future);

        if (future.isDone() || future.isCancelled()) {
            if (future.isSuccess()) {
                return completedFuture(future.getNow());
            }
            else {
                return failedFuture(future.cause());
            }
        }

        final CompletableFuture completableFuture = new CompletableFuture<>();
        future.addListener(f -> {
            if (f.isSuccess()) {
                @SuppressWarnings("unchecked") final T now = (T) f.getNow();
                completableFuture.complete(now);
            }
            else {
                completableFuture.completeExceptionally(f.cause());
            }
        });

        return completableFuture;
    }
}