| /* |
| * Copyright (c) 2013, 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. |
| */ |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /* @test |
| * @bug 8027351 8148940 |
| * @summary Basic test of the finalize method |
| */ |
| |
| public class FinalizeOverride { |
| // finalizedCount is incremented when the finalize method is invoked |
| private static AtomicInteger finalizedCount = new AtomicInteger(); |
| |
| // finalizedSum and privateFinalizedInvoke are used to verify |
| // the right overrided finalize method is invoked |
| private static AtomicInteger finalizedSum = new AtomicInteger(); |
| private static volatile boolean privateFinalizeInvoked = false; |
| |
| public static void main(String[] argvs) throws IOException { |
| patchPrivateFinalize(); |
| |
| test(new Base(10), 10); |
| test(new Subclass(20), 0); |
| test(new SubSubclass(30), 30); |
| test(new PublicFinalize(40), 40*100+40); |
| test(new PrivateFinalize(50), 50); |
| test(new NoOverride(60), 60); |
| } |
| |
| static void test(Object o, int expected) { |
| int count = finalizedCount.get(); |
| int sum = finalizedSum.get(); |
| privateFinalizeInvoked = false; |
| |
| // force GC and finalization |
| o = null; |
| while (finalizedCount.get() != (count+1)) { |
| System.gc(); |
| System.runFinalization(); |
| // Running System.gc() and System.runFinalization() in a |
| // tight loop can trigger frequent safepointing that slows |
| // down the VM and, as a result, the test. (With the |
| // HotSpot VM, the effect of frequent safepointing is |
| // especially noticeable if the test is run with the |
| // -Xcomp flag.) Sleeping for a second after every |
| // garbage collection and finalization cycle gives the VM |
| // time to make progress. |
| try { |
| Thread.sleep(1000); |
| } catch (InterruptedException e) { |
| System.out.println("Main thread interrupted, continuing execution."); |
| } |
| } |
| |
| if (privateFinalizeInvoked) { |
| throw new RuntimeException("private finalize method invoked"); |
| } |
| if (finalizedCount.get() != (count+1)) { |
| throw new RuntimeException("Unexpected count=" + finalizedCount + |
| " expected=" + (count+1)); |
| } |
| if (finalizedSum.get() != (sum+expected)) { |
| throw new RuntimeException("Unexpected sum=" + finalizedSum + |
| " prev=" + sum + " value=" + expected); |
| } |
| } |
| |
| static void patchPrivateFinalize() throws IOException { |
| // patch the private f_nal_ze method name to "finalize" |
| String testClasses = System.getProperty("test.classes", "."); |
| Path p = Paths.get(testClasses, "FinalizeOverride$PrivateFinalize.class"); |
| byte[] bytes = Files.readAllBytes(p); |
| int len = "f_nal_ze".length(); |
| for (int i=0; i < bytes.length-len; i++) { |
| if (bytes[i] == 'f' && |
| bytes[i+1] == '_' && |
| bytes[i+2] == 'n' && |
| bytes[i+3] == 'a' && |
| bytes[i+4] == 'l' && |
| bytes[i+5] == '_' && |
| bytes[i+6] == 'z' && |
| bytes[i+7] == 'e') |
| { |
| // s%_%i% |
| bytes[i+1] = 'i'; |
| bytes[i+5] = 'i'; |
| break; |
| } |
| } |
| Files.write(p, bytes); |
| } |
| |
| static class Base { |
| protected int value; |
| Base(int v) { |
| this.value = v; |
| } |
| int called() { |
| finalizedSum.addAndGet(value); |
| return value; |
| } |
| protected void finalize() { |
| System.out.println("Base.finalize() sum += " + called()); |
| finalizedCount.incrementAndGet(); |
| } |
| } |
| static class PublicFinalize extends Base { |
| PublicFinalize(int v) { |
| super(v); |
| } |
| public void finalize() { |
| finalizedSum.addAndGet(value * 100); |
| System.out.println("PublicFinalize.finalize() sum += " + called() + |
| "+"+value+"*100"); |
| finalizedCount.incrementAndGet(); |
| } |
| } |
| static class Subclass extends Base { |
| Subclass(int v) { |
| super(v); |
| } |
| protected void finalize() { |
| // no value added to sum |
| System.out.println("Subclass.finalize() sum += 0"); |
| finalizedCount.incrementAndGet(); |
| } |
| } |
| static class SubSubclass extends Subclass { |
| SubSubclass(int v) { |
| super(v); |
| } |
| protected final void finalize() { |
| finalizedSum.addAndGet(value); |
| System.out.println("SubSubclass.finalize() sum +=" +value); |
| finalizedCount.incrementAndGet(); |
| } |
| } |
| static class PrivateFinalize extends Base { |
| PrivateFinalize(int v) { |
| super(v); |
| } |
| private void f_nal_ze() { |
| // finalization catches any exception |
| System.out.println("Error: private finalize invoked!!"); |
| privateFinalizeInvoked = true; |
| finalizedCount.incrementAndGet(); |
| } |
| } |
| static class NoOverride extends PrivateFinalize { |
| NoOverride(int v) { |
| super(v); |
| } |
| } |
| } |