com.insightml.utils.jobs.Threaded.java Source code

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Here is the source code for com.insightml.utils.jobs.Threaded.java

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/*
 * Copyright (C) 2016 Stefan Hen
 *
 * 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 com.insightml.utils.jobs;

import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.Callable;

import org.apache.commons.math3.util.Pair;

import com.insightml.utils.types.AbstractClass;
import com.insightml.utils.types.collections.ArrayIterator;

public abstract class Threaded<I, O> extends AbstractClass {

    public final List<Pair<I, O>> run(final I[] input, final int directThreshold) {
        return run(new ArrayIterator<>(input), directThreshold);
    }

    public final List<Pair<I, O>> run(final Iterable<? extends I> queue, final int directThreshold) {
        final List<Callable<Pair<I, O>>> tasks = new LinkedList<>();
        int i = -1;
        for (final I it : queue) {
            final int j = ++i;
            tasks.add(new Callable<Pair<I, O>>() {
                @Override
                public Pair<I, O> call() {
                    try {
                        return new Pair<>(it, exec(j, it));
                    } catch (final Exception e) {
                        e.printStackTrace();
                        throw new IllegalStateException(e);
                    }
                }
            });
        }
        return new LinkedList<>(JobPool.invokeAll(tasks, directThreshold));
    }

    protected abstract O exec(int i, I input) throws Exception;

}