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Implementation of blocking (IO-Bound) cancellable java.util.concurrent.CompletionStage and related extensions to java.util.concurrent.ExecutorService-s

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/**
 * Copyright 2015-2019 Valery Silaev (http://vsilaev.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.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 net.tascalate.concurrent;

import java.util.Collections;
import java.util.List;
import java.util.Optional;

public class MultitargetException extends Exception {
    final private static long serialVersionUID = 1L;

    final private List exceptions;

    public MultitargetException(final List exceptions) {
        this.exceptions = exceptions;
    }

    public List getExceptions() {
        return Collections.unmodifiableList(exceptions);
    }
    
    Optional getFirstException() {
        return exceptions.stream().filter(ex -> ex != null).findFirst();
    }

    public static MultitargetException of(final Throwable exception) {
        return new MultitargetException(Collections.singletonList(exception));
    }
}