63 lines
2.6 KiB
Java
63 lines
2.6 KiB
Java
/*
|
|
* Copyright 2020 The Netty Project
|
|
*
|
|
* The Netty Project 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:
|
|
*
|
|
* https://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 io.netty.buffer.api;
|
|
|
|
/**
|
|
* Methods for accessing and controlling the internals of an allocator.
|
|
* This interface is intended to be used by implementors of the {@link BufferAllocator}, {@link Buffer} and
|
|
* {@link MemoryManager} interfaces.
|
|
*/
|
|
public interface AllocatorControl {
|
|
/**
|
|
* Allocate a buffer that is not tethered to any particular {@link Buffer} object,
|
|
* and return the recoverable memory object from it.
|
|
* <p>
|
|
* This allows a buffer to implement {@link Buffer#ensureWritable(int)} by having new memory allocated to it,
|
|
* without that memory being attached to some other lifetime.
|
|
*
|
|
* @param originator The buffer that originated the request for an untethered memory allocated.
|
|
* @param size The size of the requested memory allocation, in bytes.
|
|
* @return A {@link UntetheredMemory} object that is the requested allocation.
|
|
*/
|
|
UntetheredMemory allocateUntethered(Buffer originator, int size);
|
|
|
|
/**
|
|
* Return memory to the allocator, after it has been untethered from it's lifetime.
|
|
* This either happens if the memory has leaked and been re-captured, or if it is no longer in use by a buffer
|
|
* through {@link Buffer#ensureWritable(int)}.
|
|
*
|
|
* @param memory The untethered memory to return to the allocator.
|
|
*/
|
|
void recoverMemory(Object memory);
|
|
|
|
/**
|
|
* Memory that isn't attached to any particular buffer.
|
|
*/
|
|
interface UntetheredMemory {
|
|
/**
|
|
* Produce the recoverable memory object associated with this piece of untethered memory.
|
|
* @implNote This method should only be called once, since it might be expensive.
|
|
*/
|
|
<Memory> Memory memory();
|
|
|
|
/**
|
|
* Produce the drop instance associated with this piece of untethered memory.
|
|
* @implNote This method should only be called once, since it might be expensive, or interact with Cleaners.
|
|
*/
|
|
<BufferType extends Buffer> Drop<BufferType> drop();
|
|
}
|
|
}
|