103 lines
3.4 KiB
Java
103 lines
3.4 KiB
Java
/*
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* Copyright 2021 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer.api.unsafe;
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import io.netty.buffer.api.AllocatorControl;
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import io.netty.buffer.api.Buffer;
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import io.netty.buffer.api.Drop;
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import io.netty.buffer.api.MemoryManager;
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import io.netty.buffer.api.internal.Statics;
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import io.netty.util.internal.PlatformDependent;
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import java.lang.ref.Cleaner;
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import static io.netty.buffer.api.internal.Statics.convert;
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public class UnsafeMemoryManager implements MemoryManager {
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private final boolean offheap;
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public UnsafeMemoryManager(boolean offheap) {
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this.offheap = offheap;
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}
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@Override
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public boolean isNative() {
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return offheap;
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}
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@Override
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public Buffer allocateShared(AllocatorControl allocatorControl, long size, Drop<Buffer> drop, Cleaner cleaner) {
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final Object base;
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final long address;
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final UnsafeMemory memory;
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final int size32 = Math.toIntExact(size);
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if (cleaner == null) {
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cleaner = Statics.CLEANER;
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}
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if (offheap) {
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base = null;
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address = PlatformDependent.allocateMemory(size);
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PlatformDependent.setMemory(address, size, (byte) 0);
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memory = new UnsafeMemory(base, address, size32);
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drop = new CleanerDrop(memory, drop, cleaner);
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} else {
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base = new byte[size32];
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address = PlatformDependent.byteArrayBaseOffset();
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memory = new UnsafeMemory(base, address, size32);
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}
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return new UnsafeBuffer(memory, 0, size32, allocatorControl, convert(drop));
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}
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@Override
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public Buffer allocateConstChild(Buffer readOnlyConstParent) {
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assert readOnlyConstParent.readOnly();
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UnsafeBuffer buf = (UnsafeBuffer) readOnlyConstParent;
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return new UnsafeBuffer(buf);
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}
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@Override
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public Drop<Buffer> drop() {
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// We cannot reliably drop unsafe memory. We have to rely on the cleaner to do that.
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return Statics.NO_OP_DROP;
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}
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@Override
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public Object unwrapRecoverableMemory(Buffer buf) {
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return ((UnsafeBuffer) buf).recover();
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}
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@Override
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public int capacityOfRecoverableMemory(Object memory) {
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return ((UnsafeMemory) memory).size;
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}
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@Override
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public void discardRecoverableMemory(Object recoverableMemory) {
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// We cannot reliably drop unsafe memory. We have to rely on the cleaner to do that.
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}
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@Override
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public Buffer recoverMemory(AllocatorControl allocatorControl, Object recoverableMemory, Drop<Buffer> drop) {
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UnsafeMemory memory = (UnsafeMemory) recoverableMemory;
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return new UnsafeBuffer(memory, 0, memory.size, allocatorControl, convert(drop));
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}
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@Override
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public Object sliceMemory(Object memory, int offset, int length) {
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return ((UnsafeMemory) memory).slice(offset, length);
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}
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}
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