jdk-24/test/jdk/java/util/concurrent/Executors/PrivilegedCallables.java

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/*
 * @test
 * @bug 6552961 6558429
 * @summary Test privilegedCallable, privilegedCallableUsingCurrentClassLoader
 * @run main PrivilegedCallables
 * @author Martin Buchholz
 */

import static java.util.concurrent.Executors.privilegedCallable;
import static java.util.concurrent.Executors.privilegedCallableUsingCurrentClassLoader;
import static java.util.concurrent.Executors.privilegedThreadFactory;

import java.util.Random;
import java.util.concurrent.Callable;

public class PrivilegedCallables {
    Callable<Integer> real;

    final Callable<Integer> realCaller = new Callable<>() {
        public Integer call() throws Exception {
            return real.call(); }};

    final Random rnd = new Random();

    @SuppressWarnings("serial")
    final Throwable[] throwables = {
        new Exception() {},
        new RuntimeException() {},
        new Error() {}
    };
    Throwable randomThrowable() {
        return throwables[rnd.nextInt(throwables.length)];
    }
    void throwThrowable(Throwable t) throws Exception {
        if (t instanceof Error) throw (Error) t;
        if (t instanceof RuntimeException) throw (RuntimeException) t;
        throw (Exception) t;
    }

    void test(String[] args) {
        try { test(privilegedCallable(realCaller)); }
        catch (Throwable t) { unexpected(t); }

        try { test(privilegedCallableUsingCurrentClassLoader(realCaller)); }
        catch (Throwable t) { unexpected(t); }

        try { privilegedThreadFactory(); }
        catch (Throwable t) { unexpected(t); }
    }

    void test(final Callable<Integer> c) throws Throwable {
        for (int i = 0; i < 20; i++)
            if (rnd.nextBoolean()) {
                final Throwable t = randomThrowable();
                real = new Callable<>() {
                    public Integer call() throws Exception {
                        throwThrowable(t);
                        return null; }};
                try {
                    c.call();
                    fail("Expected exception not thrown");
                } catch (Throwable tt) { check(t == tt); }
            } else {
                final int n = rnd.nextInt();
                real = new Callable<>() {
                    public Integer call() { return n; }};
                equal(c.call(), n);
            }
    }

    //--------------------- Infrastructure ---------------------------
    volatile int passed = 0, failed = 0;
    void pass() {passed++;}
    void fail() {failed++; Thread.dumpStack();}
    void fail(String msg) {System.err.println(msg); fail();}
    void unexpected(Throwable t) {failed++; t.printStackTrace();}
    void check(boolean cond) {if (cond) pass(); else fail();}
    void equal(Object x, Object y) {
        if (x == null ? y == null : x.equals(y)) pass();
        else fail(x + " not equal to " + y);}
    public static void main(String[] args) throws Throwable {
        new PrivilegedCallables().instanceMain(args);}
    void instanceMain(String[] args) throws Throwable {
        try {test(args);} catch (Throwable t) {unexpected(t);}
        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
        if (failed > 0) throw new AssertionError("Some tests failed");}
    abstract class F {abstract void f() throws Throwable;}
    void THROWS(Class<? extends Throwable> k, F... fs) {
        for (F f : fs)
            try {f.f(); fail("Expected " + k.getName() + " not thrown");}
            catch (Throwable t) {
                if (k.isAssignableFrom(t.getClass())) pass();
                else unexpected(t);}}
}