91 lines
3.0 KiB
Java
91 lines
3.0 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.bytebuffer;
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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 java.lang.ref.Cleaner;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import static io.netty.buffer.api.internal.Statics.bbslice;
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import static io.netty.buffer.api.internal.Statics.convert;
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public class ByteBufferMemoryManager implements MemoryManager {
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private final boolean direct;
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public ByteBufferMemoryManager(boolean direct) {
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this.direct = direct;
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}
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@Override
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public boolean isNative() {
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return direct;
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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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int capacity = Math.toIntExact(size);
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ByteBuffer buffer = direct? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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buffer.order(ByteOrder.nativeOrder());
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return new NioBuffer(buffer, buffer, 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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NioBuffer buf = (NioBuffer) readOnlyConstParent;
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return new NioBuffer(buf);
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}
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@Override
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public Drop<Buffer> drop() {
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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 ((NioBuffer) buf).recoverable();
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}
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@Override
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public int capacityOfRecoverableMemory(Object memory) {
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//noinspection OverlyStrongTypeCast
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return ((ByteBuffer) memory).capacity();
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}
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@Override
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public void discardRecoverableMemory(Object recoverableMemory) {
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// ByteBuffers have their memory released by the GC, so there is nothing for us to do.
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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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ByteBuffer memory = (ByteBuffer) recoverableMemory;
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return new NioBuffer(memory, memory, 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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var buffer = (ByteBuffer) memory;
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return bbslice(buffer, offset, length);
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}
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}
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