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Fibers, Channels and Actors for the JVM

There is a newer version: 0.8.0

/*
 * Quasar: lightweight threads and actors for the JVM.
 * Copyright (C) 2013, Parallel Universe Software Co. All rights reserved.
 * 
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *  
 *   or (per the licensee's choosing)
 *  
 * under the terms of the GNU Lesser General Public License version 3.0
 * as published by the Free Software Foundation.
 */
package co.paralleluniverse.actors;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;

/**
 *
 * @author pron
 */
public class ActorSpec, Message, V> implements ActorBuilder {
    public static > ActorSpec of(Class type, Object... params) {
        return new ActorSpec<>(type, params);
    }
    final Constructor ctor;
    final Object[] params;

    public ActorSpec(Class type, Object[] params) {
        this(matchingConstructor(type, params), params);
    }

    public ActorSpec(Constructor ctor, Object[] params) {
        this.ctor = ctor;
        this.params = Arrays.copyOf(params, params.length);
        ctor.setAccessible(true);
    }

    private static  Constructor matchingConstructor(Class type, Object[] params) {
        final Constructor ctor = ReflectionUtil.getMatchingConstructor(type, ReflectionUtil.getTypes(params));
        if (ctor == null)
            throw new IllegalArgumentException("No constructor for type " + type.getName() + " was found to match parameters " + Arrays.toString(params));
        return ctor;
    }

    @Override
    public T build() {
        try {
            T instance = ctor.newInstance(params);
            instance.setSpec(this);
            return instance;
        } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public String toString() {
        final String ps = Arrays.toString(params);
        return "ActorSpec{" + ctor.getName() + '(' + ps.substring(1, ps.length() - 1) + ")}";
    }
}