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A fast and easy to use dense and sparse matrix linear algebra library written in Java.
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/*
 * Copyright (c) 2020, Peter Abeles. All Rights Reserved.
 *
 * This file is part of Efficient Java Matrix Library (EJML).
 *
 * 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 pabeles.concurrency;

import org.jetbrains.annotations.Nullable;

import java.util.Objects;
import java.util.concurrent.ForkJoinTask;

/**
 * @author Peter Abeles
 */
@SuppressWarnings("NullAway.Init")
public abstract class IntOperatorTask extends ForkJoinTask {

    final int value;
    final int max;
    final IntProducerNumber consumer;

    boolean master = true;
    Number result;
    Class primitiveType;

    @Nullable IntOperatorTask next = null;

    protected IntOperatorTask( int value, int max,
                               Class primitiveType,
                               IntProducerNumber consumer ) {
        this.value = value;
        this.max = max;
        this.primitiveType = primitiveType;
        this.consumer = consumer;
    }

    @Override
    public Number getRawResult() {return result;}

    @Override
    protected void setRawResult( Number value ) {
        this.result = value;
    }

    @Override
    protected boolean exec() {
        IntOperatorTask root = null;
        IntOperatorTask previous = null;

        // spawn children until there's no more to spawn
        if (master) {
            // process all but the last value
            int value = this.value;
            while (value + 1 < max) {
                IntOperatorTask child = newInstance(value, max, primitiveType, consumer);
                child.master = false;
                if (root == null) {
                    root = child;
                    previous = child;
                } else {
                    Objects.requireNonNull(previous).next = child;
                    previous = child;
                }
                child.fork();
                value += 1;
            }
            // process the last value in this thread
            result = consumer.accept(value);
        } else {
            result = consumer.accept(value);
        }


        while (root != null) {
            // perform the operation on the current result and the result from this thread
            root.join();
            operator(root.result);
            IntOperatorTask next = root.next;
            root.next = null; // free memory.
            root = next;
        }

        return true;
    }

    protected abstract IntOperatorTask newInstance( int value, int max,
                                                    Class primitiveType,
                                                    IntProducerNumber consumer );

    protected abstract void operator( Number next );

    public static class Sum extends IntOperatorTask {

        public Sum( int value, int max, Class primitiveType, IntProducerNumber consumer ) {
            super(value, max, primitiveType, consumer);
        }

        @Override
        protected IntOperatorTask newInstance( int value, int max, Class primitiveType, IntProducerNumber consumer ) {
            return new Sum(value, max, primitiveType, consumer);
        }

        @Override
        protected void operator( Number next ) {
            if (primitiveType == byte.class) {
                result = result.byteValue() + next.byteValue();
            } else if (primitiveType == short.class) {
                result = result.shortValue() + next.shortValue();
            } else if (primitiveType == int.class) {
                result = result.intValue() + next.intValue();
            } else if (primitiveType == long.class) {
                result = result.longValue() + next.longValue();
            } else if (primitiveType == float.class) {
                result = result.floatValue() + next.floatValue();
            } else if (primitiveType == double.class) {
                result = result.doubleValue() + next.doubleValue();
            } else {
                throw new RuntimeException("Unknown primitive type " + primitiveType);
            }
        }
    }

    public static class Max extends IntOperatorTask {

        public Max( int value, int max, Class primitiveType, IntProducerNumber consumer ) {
            super(value, max, primitiveType, consumer);
        }

        @Override
        protected IntOperatorTask newInstance( int value, int max, Class primitiveType, IntProducerNumber consumer ) {
            return new Max(value, max, primitiveType, consumer);
        }

        @Override
        protected void operator( Number next ) {
            if (primitiveType == byte.class) {
                result = Math.max(result.byteValue(), next.byteValue());
            } else if (primitiveType == short.class) {
                result = Math.max(result.shortValue(), next.shortValue());
            } else if (primitiveType == int.class) {
                result = Math.max(result.intValue(), next.intValue());
            } else if (primitiveType == long.class) {
                result = Math.max(result.longValue(), next.longValue());
            } else if (primitiveType == float.class) {
                result = Math.max(result.floatValue(), next.floatValue());
            } else if (primitiveType == double.class) {
                result = Math.max(result.doubleValue(), next.doubleValue());
            } else {
                throw new RuntimeException("Unknown primitive type " + primitiveType);
            }
        }
    }

    public static class Min extends IntOperatorTask {

        public Min( int value, int max, Class primitiveType, IntProducerNumber consumer ) {
            super(value, max, primitiveType, consumer);
        }

        @Override
        protected IntOperatorTask newInstance( int value, int max, Class primitiveType, IntProducerNumber consumer ) {
            return new Min(value, max, primitiveType, consumer);
        }

        @Override
        protected void operator( Number next ) {
            if (primitiveType == byte.class) {
                result = Math.min(result.byteValue(), next.byteValue());
            } else if (primitiveType == short.class) {
                result = Math.min(result.shortValue(), next.shortValue());
            } else if (primitiveType == int.class) {
                result = Math.min(result.intValue(), next.intValue());
            } else if (primitiveType == long.class) {
                result = Math.min(result.longValue(), next.longValue());
            } else if (primitiveType == float.class) {
                result = Math.min(result.floatValue(), next.floatValue());
            } else if (primitiveType == double.class) {
                result = Math.min(result.doubleValue(), next.doubleValue());
            } else {
                throw new RuntimeException("Unknown primitive type " + primitiveType);
            }
        }
    }
}