/*

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * 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.

 *

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 */

/*

 * @test LFGarbageCollectedTest

 * @bug 8046703

 * @summary Test verifies that lambda forms are garbage collected

 * @author kshefov

 * @library /lib/testlibrary/jsr292 /lib/testlibrary

 * @build TestMethods

 * @build LambdaFormTestCase

 * @build LFGarbageCollectedTest

 */

import java.lang.invoke.MethodHandle;

import java.lang.ref.PhantomReference;

import java.lang.ref.ReferenceQueue;

import java.lang.reflect.InvocationTargetException;

import java.util.EnumSet;

import java.util.Map;

/**

 * Lambda forms garbage collection test class.

 */

public final class LFGarbageCollectedTest extends LambdaFormTestCase {

    /**

     * Constructor for a lambda forms garbage collection test case.

     *

     * @param testMethod A method from {@code j.l.i.MethodHandles} class that

     * returns a {@code j.l.i.MethodHandle} instance.

     */

    public LFGarbageCollectedTest(TestMethods testMethod) {

        super(testMethod);

    }

    @Override

    public void doTest() {

        try {

            MethodHandle adapter;

            try {

            } catch (NoSuchMethodException ex) {

                throw new Error("Unexpected exception: ", ex);

            }

            if (lambdaForm == null) {

                throw new Error("Unexpected error: Lambda form of the method handle is null");

            }

            lambdaForm = null;

            adapter = null;

        } catch (IllegalAccessException | IllegalArgumentException |

                InvocationTargetException ex) {

            throw new Error("Unexpected exception: ", ex);

        }

    }

    /**

     * Main routine for lambda forms garbage collection test.

     *

     * @param args Accepts no arguments.

     */

    public static void main(String[] args) {

        // The "identity", "constant", "arrayElementGetter" and "arrayElementSetter"

        // methods should be removed from this test,

        // because their lambda forms are stored in a static field and are not GC'ed.

        // There can be only a finite number of such LFs for each method,

        // so no memory leak happens.

        EnumSet<TestMethods> testMethods = EnumSet.complementOf(EnumSet.of(

                TestMethods.IDENTITY,

                TestMethods.CONSTANT,

                TestMethods.ARRAY_ELEMENT_GETTER,

        LambdaFormTestCase.runTests(LFGarbageCollectedTest::new, testMethods);

    }

}