SLSharedCodeSeparatedEnvTest.java

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package com.oracle.truffle.sl.test;

import com.oracle.truffle.api.instrumentation.EventBinding;
import com.oracle.truffle.api.instrumentation.TruffleInstrument;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.vm.PolyglotEngine;
import com.oracle.truffle.api.vm.PolyglotRuntime;
import com.oracle.truffle.sl.SLLanguage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.concurrent.Executor;
import org.junit.After;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import org.junit.Before;
import org.junit.Test;

public class SLSharedCodeSeparatedEnvTest implements Executor {

    private ByteArrayOutputStream osRuntime;
    private ByteArrayOutputStream os1;
    private ByteArrayOutputStream os2;
    private PolyglotEngine e1;
    private PolyglotEngine e2;
    private int executes;

    @Before
    public void initializeEngines() {
        osRuntime = new ByteArrayOutputStream();
        PolyglotRuntime runtime = PolyglotRuntime.newBuilder().setOut(osRuntime).setErr(osRuntime).build();

        os1 = new ByteArrayOutputStream();
        os2 = new ByteArrayOutputStream();

        // @formatter:off
        e1 = PolyglotEngine.newBuilder().
            runtime(runtime).
            setOut(os1).
            globalSymbol("extra", 1).
            build();
        e2 = PolyglotEngine.newBuilder().
            runtime(runtime).
            setOut(os2).
            globalSymbol("extra", 2).
            executor(this).
            build();

    }

    @Test
    public void shareCodeUseDifferentOutputStreams() throws Exception {
        int instances = SLLanguage.counter;
        Source sayHello = Source.newBuilder(
            "function main() {\n" +
            "  println(\"Ahoj\" + import(\"extra\"));" +
            "}"
        ).mimeType("application/x-sl").name("sayHello.sl").build();
        // @formatter:on

        executes = 0;
        e1.eval(sayHello);
        assertEquals("Ahoj1\n", os1.toString("UTF-8"));
        assertEquals("", os2.toString("UTF-8"));

        e2.eval(sayHello);
        assertEquals("Ahoj1\n", os1.toString("UTF-8"));
        assertEquals("Ahoj2\n", os2.toString("UTF-8"));

        assertEquals("Executor used once", 1, executes);
        assertEquals("One SLLanguage instance created", instances + 1, SLLanguage.counter);
    }

    @Test
    public void instrumentsSeeOutputOfBoth() throws Exception {
        PolyglotRuntime.Instrument outInstr = e2.getRuntime().getInstruments().get("captureOutput");
        outInstr.setEnabled(true);
        ByteArrayOutputStream outConsumer = outInstr.lookup(ByteArrayOutputStream.class);
        assertNotNull("Stream capturing is ready", outConsumer);

        Source sayHello = Source.newBuilder(
                        "function main() {\n" +
                                        "  println(\"Ahoj\" + import(\"extra\"));" +
                                        "}").mimeType("application/x-sl").name("sayHello.sl").build();
        // @formatter:on

        e1.eval(sayHello);
        assertEquals("Ahoj1\n", os1.toString("UTF-8"));
        assertEquals("", os2.toString("UTF-8"));

        e2.eval(sayHello);
        assertEquals("Ahoj1\n", os1.toString("UTF-8"));
        assertEquals("Ahoj2\n", os2.toString("UTF-8"));

        outInstr.setEnabled(false);

        assertEquals("Output of instrument goes to osRuntime",
                        "initializingOutputCapture\n" + "Ahoj1\n" + "Ahoj2\n" + "endOfOutputCapture\n",
                        osRuntime.toString("UTF-8"));

        assertEquals("Output of both engines and instruments is capturable",
                        "initializingOutputCapture\n" +
                                        "Ahoj1\n" +
                                        "Ahoj2\n" +
                                        "endOfOutputCapture\n",
                        outConsumer.toString("UTF-8"));
    }

    @After
    public void cleanUpEngines() {
        e1.dispose();
        e2.dispose();
    }

    @Override
    public void execute(Runnable command) {
        executes++;
        command.run();
    }

    @TruffleInstrument.Registration(id = "captureOutput")
    public static class CaptureOutput extends TruffleInstrument {
        private EventBinding<ByteArrayOutputStream> binding;

        @Override
        protected void onCreate(final TruffleInstrument.Env env) {
            final ByteArrayOutputStream capture = new ByteArrayOutputStream() {
                @Override
                public void write(byte[] b) throws IOException {
                    super.write(b);
                }

                @Override
                public synchronized void write(byte[] b, int off, int len) {
                    super.write(b, off, len);
                }

                @Override
                public synchronized void write(int b) {
                    super.write(b);
                }
            };
            binding = env.getInstrumenter().attachOutConsumer(capture);
            env.registerService(capture);
            try {
                env.out().write("initializingOutputCapture\n".getBytes("UTF-8"));
            } catch (IOException ex) {
                throw new IllegalStateException(ex);
            }
        }

        @Override
        protected void onDispose(Env env) {
            try {
                env.out().write("endOfOutputCapture\n".getBytes("UTF-8"));
            } catch (IOException ex) {
                throw new IllegalStateException(ex);
            }
            binding.dispose();
        }
    }
}