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Java example source code file (CallSiteTest.java)

This example Java source code file (CallSiteTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

assertionerror, callsite, callsitetest, class, indy_mcs, indy_vcs, methodhandle, methodtype, mh_bsm_vcs, mt_bsm, mutablecallsite, reflectiveoperationexception, string, throwable

The CallSiteTest.java Java example source code

/*
 * Copyright (c) 2011, 2012, 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.
 *
 * 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

/**
 * @test
 * @summary smoke tests for CallSite
 *
 * @build indify.Indify
 * @compile CallSiteTest.java
 * @run main/othervm/timeout=3600 -XX:+IgnoreUnrecognizedVMOptions -XX:-VerifyDependencies
 *      indify.Indify
 *      --expand-properties --classpath ${test.classes}
 *      --java test.java.lang.invoke.CallSiteTest
 */

package test.java.lang.invoke;

import java.io.*;

import java.lang.invoke.*;
import static java.lang.invoke.MethodHandles.*;
import static java.lang.invoke.MethodType.*;

public class CallSiteTest {
    private final static Class<?> CLASS = CallSiteTest.class;

    private static CallSite mcs;
    private static CallSite vcs;
    private static MethodHandle mh_foo;
    private static MethodHandle mh_bar;

    static {
        try {
            mh_foo = lookup().findStatic(CLASS, "foo", methodType(int.class, int.class, int.class));
            mh_bar = lookup().findStatic(CLASS, "bar", methodType(int.class, int.class, int.class));
            mcs = new MutableCallSite(mh_foo);
            vcs = new VolatileCallSite(mh_foo);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String... av) throws Throwable {
        testMutableCallSite();
        testVolatileCallSite();
    }

    private final static int N = Integer.MAX_VALUE / 100;
    private final static int RESULT1 = 762786192;
    private final static int RESULT2 = -21474836;

    private static void assertEquals(int expected, int actual) {
        if (expected != actual)
            throw new AssertionError("expected: " + expected + ", actual: " + actual);
    }

    private static void testMutableCallSite() throws Throwable {
        // warm-up
        for (int i = 0; i < 20000; i++) {
            mcs.setTarget(mh_foo);
        }
        // run
        for (int n = 0; n < 2; n++) {
            mcs.setTarget(mh_foo);
            for (int i = 0; i < 5; i++) {
                assertEquals(RESULT1, runMutableCallSite());
            }
            mcs.setTarget(mh_bar);
            for (int i = 0; i < 5; i++) {
                assertEquals(RESULT2, runMutableCallSite());
            }
        }
    }
    private static void testVolatileCallSite() throws Throwable {
        // warm-up
        for (int i = 0; i < 20000; i++) {
            vcs.setTarget(mh_foo);
        }
        // run
        for (int n = 0; n < 2; n++) {
            vcs.setTarget(mh_foo);
            for (int i = 0; i < 5; i++) {
                assertEquals(RESULT1, runVolatileCallSite());
            }
            vcs.setTarget(mh_bar);
            for (int i = 0; i < 5; i++) {
                assertEquals(RESULT2, runVolatileCallSite());
            }
        }
    }

    private static int runMutableCallSite() throws Throwable {
        int sum = 0;
        for (int i = 0; i < N; i++) {
            sum += (int) INDY_mcs().invokeExact(i, i+1);
        }
        return sum;
    }
    private static int runVolatileCallSite() throws Throwable {
        int sum = 0;
        for (int i = 0; i < N; i++) {
            sum += (int) INDY_vcs().invokeExact(i, i+1);
        }
        return sum;
    }

    static int foo(int a, int b) { return a + b; }
    static int bar(int a, int b) { return a - b; }

    private static MethodType MT_bsm() {
        shouldNotCallThis();
        return methodType(CallSite.class, Lookup.class, String.class, MethodType.class);
    }

    private static CallSite bsm_mcs(Lookup caller, String name, MethodType type) throws ReflectiveOperationException {
        return mcs;
    }
    private static MethodHandle MH_bsm_mcs() throws ReflectiveOperationException {
        shouldNotCallThis();
        return lookup().findStatic(lookup().lookupClass(), "bsm_mcs", MT_bsm());
    }
    private static MethodHandle INDY_mcs() throws Throwable {
        shouldNotCallThis();
        return ((CallSite) MH_bsm_mcs().invoke(lookup(), "foo", methodType(int.class, int.class, int.class))).dynamicInvoker();
    }

    private static CallSite bsm_vcs(Lookup caller, String name, MethodType type) throws ReflectiveOperationException {
        return vcs;
    }
    private static MethodHandle MH_bsm_vcs() throws ReflectiveOperationException {
        shouldNotCallThis();
        return lookup().findStatic(lookup().lookupClass(), "bsm_vcs", MT_bsm());
    }
    private static MethodHandle INDY_vcs() throws Throwable {
        shouldNotCallThis();
        return ((CallSite) MH_bsm_vcs().invoke(lookup(), "foo", methodType(int.class, int.class, int.class))).dynamicInvoker();
    }

    private static void shouldNotCallThis() {
        // if this gets called, the transformation has not taken place
        throw new AssertionError("this code should be statically transformed away by Indify");
    }
}

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