| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.cassandra.io.util; |
| |
| import net.nicoulaj.compilecommand.annotations.Inline; |
| import org.apache.cassandra.utils.concurrent.Ref; |
| import org.apache.cassandra.utils.concurrent.RefCounted; |
| import org.apache.cassandra.utils.concurrent.SharedCloseable; |
| import org.apache.cassandra.utils.memory.MemoryUtil; |
| |
| public class SafeMemory extends Memory implements SharedCloseable |
| { |
| private final Ref<?> ref; |
| public SafeMemory(long size) |
| { |
| super(size); |
| ref = new Ref<>(null, new MemoryTidy(peer, size)); |
| } |
| |
| private SafeMemory(SafeMemory copyOf) |
| { |
| super(copyOf); |
| ref = copyOf.ref.ref(); |
| /** see {@link Memory#Memory(long)} re: null pointers*/ |
| if (peer == 0 && size != 0) |
| { |
| ref.ensureReleased(); |
| throw new IllegalStateException("Cannot create a sharedCopy of a SafeMemory object that has already been closed"); |
| } |
| } |
| |
| public SafeMemory sharedCopy() |
| { |
| return new SafeMemory(this); |
| } |
| |
| public void free() |
| { |
| ref.release(); |
| peer = 0; |
| } |
| |
| public void close() |
| { |
| ref.ensureReleased(); |
| peer = 0; |
| } |
| |
| public Throwable close(Throwable accumulate) |
| { |
| return ref.ensureReleased(accumulate); |
| } |
| |
| public SafeMemory copy(long newSize) |
| { |
| SafeMemory copy = new SafeMemory(newSize); |
| copy.put(0, this, 0, Math.min(size(), newSize)); |
| return copy; |
| } |
| |
| private static final class MemoryTidy implements RefCounted.Tidy |
| { |
| final long peer; |
| final long size; |
| private MemoryTidy(long peer, long size) |
| { |
| this.peer = peer; |
| this.size = size; |
| } |
| |
| public void tidy() |
| { |
| /** see {@link Memory#Memory(long)} re: null pointers*/ |
| if (peer != 0) |
| MemoryUtil.free(peer); |
| } |
| |
| public String name() |
| { |
| return Memory.toString(peer, size); |
| } |
| } |
| |
| @Inline |
| protected void checkBounds(long start, long end) |
| { |
| assert peer != 0 || size == 0 : ref.printDebugInfo(); |
| super.checkBounds(start, end); |
| } |
| |
| public void addTo(Ref.IdentityCollection identities) |
| { |
| identities.add(ref); |
| } |
| } |