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113 lines
3.7 KiB
Java
113 lines
3.7 KiB
Java
/*
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* Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.util.zip;
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import java.util.function.LongConsumer;
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import java.util.function.LongSupplier;
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import java.lang.ref.Cleaner.Cleanable;
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import jdk.internal.ref.CleanerFactory;
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/**
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* A reference to the native zlib's z_stream structure. It also
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* serves as the "cleaner" to clean up the native resource when
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* the deflater or infalter is ended, closed or cleaned.
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*/
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class ZStreamRef implements Runnable {
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private LongConsumer end;
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private long address;
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private final Cleanable cleanable;
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private ZStreamRef (Object owner, LongSupplier addr, LongConsumer end) {
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this.cleanable = CleanerFactory.cleaner().register(owner, this);
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this.end = end;
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this.address = addr.getAsLong();
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}
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long address() {
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return address;
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}
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void clean() {
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cleanable.clean();
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}
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public synchronized void run() {
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long addr = address;
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address = 0;
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if (addr != 0) {
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end.accept(addr);
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}
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}
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private ZStreamRef (LongSupplier addr, LongConsumer end) {
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this.cleanable = null;
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this.end = end;
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this.address = addr.getAsLong();
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}
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/*
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* If {@code Inflater/Deflater} has been subclassed and the {@code end} method
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* is overridden, uses {@code finalizer} mechanism for resource cleanup. So
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* {@code end} method can be called when the {@code Inflater/Deflater} is
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* unreachable. This mechanism will be removed when the {@code finalize} method
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* is removed from {@code Inflater/Deflater}.
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*/
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static ZStreamRef get(Object owner, LongSupplier addr, LongConsumer end) {
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Class<?> clz = owner.getClass();
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while (clz != Deflater.class && clz != Inflater.class) {
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try {
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clz.getDeclaredMethod("end");
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return new FinalizableZStreamRef(owner, addr, end);
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} catch (NoSuchMethodException nsme) {}
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clz = clz.getSuperclass();
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}
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return new ZStreamRef(owner, addr, end);
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}
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private static class FinalizableZStreamRef extends ZStreamRef {
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final Object owner;
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FinalizableZStreamRef (Object owner, LongSupplier addr, LongConsumer end) {
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super(addr, end);
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this.owner = owner;
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}
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@Override
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void clean() {
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run();
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}
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@Override
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@SuppressWarnings("deprecation")
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protected void finalize() {
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if (owner instanceof Inflater)
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((Inflater)owner).end();
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else
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((Deflater)owner).end();
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}
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}
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}
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