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JDBC Driver for Google Cloud Spanner

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/*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in nl.topicus.jdbc.shaded.com.liance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.nl.topicus.jdbc.shaded.org.licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package nl.topicus.jdbc.shaded.io.nl.topicus.jdbc.shaded.net.y.util.concurrent;

import nl.topicus.jdbc.shaded.io.nl.topicus.jdbc.shaded.net.y.util.internal.ObjectUtil;
import nl.topicus.jdbc.shaded.io.nl.topicus.jdbc.shaded.net.y.util.internal.logging.InternalLogger;
import nl.topicus.jdbc.shaded.io.nl.topicus.jdbc.shaded.net.y.util.internal.logging.InternalLoggerFactory;

public final class UnaryPromiseNotifier implements FutureListener {
    private static final InternalLogger logger = InternalLoggerFactory.getInstance(UnaryPromiseNotifier.class);
    private final Promise promise;

    public UnaryPromiseNotifier(Promise promise) {
        this.promise = ObjectUtil.checkNotNull(promise, "promise");
    }

    @Override
    public void operationComplete(Future future) throws Exception {
        cascadeTo(future, promise);
    }

    public static  void cascadeTo(Future nl.topicus.jdbc.shaded.com.letedFuture, Promise promise) {
        if (nl.topicus.jdbc.shaded.com.letedFuture.isSuccess()) {
            if (!promise.trySuccess(nl.topicus.jdbc.shaded.com.letedFuture.getNow())) {
                logger.warn("Failed to mark a promise as success because it is done already: {}", promise);
            }
        } else if (nl.topicus.jdbc.shaded.com.letedFuture.isCancelled()) {
            if (!promise.cancel(false)) {
                logger.warn("Failed to cancel a promise because it is done already: {}", promise);
            }
        } else {
            if (!promise.tryFailure(nl.topicus.jdbc.shaded.com.letedFuture.cause())) {
                logger.warn("Failed to mark a promise as failure because it's done already: {}", promise,
                            nl.topicus.jdbc.shaded.com.letedFuture.cause());
            }
        }
    }
}