AsyncExecutorTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package com.oracle.truffle.api.test.vm;

import static org.junit.Assert.assertTrue;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.junit.Assert;
import org.junit.Test;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.vm.PolyglotEngine;
import com.oracle.truffle.api.vm.PolyglotEngine.Value;

public class AsyncExecutorTest {

    @Test
    public void testSynchronousLanguageAccess() {
        PolyglotEngine engine = PolyglotEngine.newBuilder().build();
        Source s = Source.newBuilder("").mimeType("application/x-test-async").name("").build();
        List<Value> values = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            values.add(engine.eval(s));
        }
        for (int i = 0; i < 100; i++) {
            Assert.assertEquals(i, (int) values.get(i).as(Integer.class));
        }
    }

    @Test
    public void testFailingAsyncLanguageAccess() {
        ExecutorService service = Executors.newFixedThreadPool(10);
        PolyglotEngine engine = PolyglotEngine.newBuilder().executor(service).build();
        Source s = Source.newBuilder("").mimeType("application/x-test-async").name("").build();
        List<Value> values = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            values.add(engine.eval(s));
        }
        boolean atLeastOneIsOK = false;
        boolean atLeastOneIsBad = false;
        for (int i = 0; i < 100; i++) {
            // fails because the execution is depending on a side-effect.
            // this way you can crash arbitrary languages.
            try {
                final int result = values.get(i).as(Integer.class);
                Assert.assertTrue("We obtained a result", result >= 0);
                atLeastOneIsOK = true;
            } catch (IllegalStateException ex) {
                assertTrue(ex.getMessage(), ex.getMessage().contains("Currently executing in Thread"));
                atLeastOneIsBad = true;
            }
        }
        assertTrue("1st execution has to be OK", atLeastOneIsOK);
        assertTrue("Executions in other threads have to be rejected", atLeastOneIsBad);
    }

    private static class AsyncContext {

        private int value;

        public int operationWithSideEffects() {
            return value++;
        }

    }

    @TruffleLanguage.Registration(name = "Async", mimeType = "application/x-test-async", version = "1.0")
    public static class AsyncLanguage extends TruffleLanguage<AsyncContext> {

        public AsyncLanguage() {
        }

        @Override
        protected AsyncContext createContext(Env env) {
            return new AsyncContext();
        }

        @Override
        protected CallTarget parse(ParsingRequest request) {
            return Truffle.getRuntime().createCallTarget(new RootNode(AsyncLanguage.this) {

                @Override
                public Object execute(VirtualFrame frame) {
                    return getContextReference().get().operationWithSideEffects();
                }
            });
        }

        @Override
        protected Object findExportedSymbol(AsyncContext context, String globalName, boolean onlyExplicit) {
            return null;
        }

        @Override
        protected Object getLanguageGlobal(AsyncContext context) {
            return null;
        }

        @Override
        protected boolean isObjectOfLanguage(Object object) {
            return false;
        }

    }

}