/*
 * Copyright (c) 2014 Brocade Communications Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.yangtools.util.concurrent;

import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.Uninterruptibles;
import java.util.concurrent.CountDownLatch;

/**
 * Some common test utilities.
 *
 * @author Thomas Pantelis
 */
final class CommonTestUtils {
    private CommonTestUtils() {
        throw new UnsupportedOperationException();
    }

    @FunctionalInterface
    public interface Invoker {
        ListenableFuture<?> invokeExecutor(ListeningExecutorService executor, CountDownLatch blockingLatch);
    }

    public static final Invoker SUBMIT_CALLABLE = (executor, blockingLatch) -> executor.submit(() -> {
        if (blockingLatch != null) {
            Uninterruptibles.awaitUninterruptibly(blockingLatch);
        }
        return null;
    });

    public static final Invoker SUBMIT_RUNNABLE = (executor, blockingLatch) -> executor.submit(() -> {
        if (blockingLatch != null) {
            Uninterruptibles.awaitUninterruptibly(blockingLatch);
        }
    });

    public static final Invoker SUBMIT_RUNNABLE_WITH_RESULT = (executor, blockingLatch) -> executor.submit(() -> {
        if (blockingLatch != null) {
            Uninterruptibles.awaitUninterruptibly(blockingLatch);
        }
    }, "foo");
}