PolyglotEngineWithRuby.java

/*
 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package com.oracle.truffle.tck.impl;

import static org.junit.Assert.assertEquals;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.vm.PolyglotEngine;
import com.oracle.truffle.api.vm.PolyglotEngine.Value;
import com.oracle.truffle.tck.impl.TruffleLanguageRunner.RubyRunner;

/**
 * Tests with code snippets referencing Ruby. They are used from {@link PolyglotEngine} & co.
 * classes, but executed only when implementation of Ruby is around.
 */
@RunWith(RubyRunner.class)
public class PolyglotEngineWithRuby {

    private PolyglotEngine engine;

    @Before
    public void initEngine() {
        engine = PolyglotEngine.newBuilder().build();
    }

    @After
    public void disposeEngine() {
        engine.dispose();
    }

    @Test
    public void testCallRubyFunctionFromJava() {
        callRubyFunctionFromJava();
    }

    // @formatter:off

    // BEGIN: com.oracle.truffle.tck.impl.PolyglotEngineWithRuby#callRubyFunctionFromJava
    @FunctionalInterface
    interface Multiplier {
        int multiply(int a, int b);
    }

    public void callRubyFunctionFromJava() {
        Source src = Source.newBuilder(
            "proc { |a, b|\n" +
            "  a * b" +
            "}").mimeType("application/x-ruby").name("mul.rb").build();

        // Evaluate Ruby function definition
        Value rbFunction = engine.eval(src);

        // Create Java access to Ruby function
        Multiplier mul = rbFunction.as(Multiplier.class);

        assertEquals(42, mul.multiply(6, 7));
        assertEquals(144, mul.multiply(12, 12));
        assertEquals(256, mul.multiply(32, 8));
    }
    // END: com.oracle.truffle.tck.impl.PolyglotEngineWithRuby#callRubyFunctionFromJava

    // @formatter:on

}