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package com.oracle.truffle.js.test.threading;

import static org.junit.Assert.assertEquals;

import java.util.concurrent.atomic.AtomicInteger;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.HostAccess;
import org.junit.Test;

public class SharedJavaObjects {

    
Polyglot language bindings can be used to share Java objects between JS Contexts.
/**
     * Polyglot language bindings can be used to share Java objects between JS Contexts.
     */
    @Test(timeout = 30000)
    public void valueInTwoThreads() throws InterruptedException {
        final Context cx1 = TestUtil.newContextBuilder().allowHostAccess(HostAccess.ALL).build();
        final Context cx2 = TestUtil.newContextBuilder().allowHostAccess(HostAccess.ALL).build();
        final AtomicInteger counter = new AtomicInteger(200);

        try {
            cx1.getBindings("js").putMember("counter", counter);
            cx2.getBindings("js").putMember("counter", counter);

            Thread thread = new Thread(new Runnable() {

                @Override
                public void run() {
                    int dec = 100;
                    while (dec-- != 0) {
                        cx1.eval("js", "counter.decrementAndGet()");
                    }
                }
            });
            thread.start();
            int dec = 100;
            while (dec-- != 0) {
                cx2.eval("js", "counter.decrementAndGet()");
            }
            thread.join();
            assertEquals(counter.get(), 0);
        } finally {
            cx1.close();
            cx2.close();
        }
    }

}