| /* |
| * 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.mnemonic; |
| |
| import org.apache.mnemonic.resgc.ReclaimContext; |
| |
| public abstract class RetrievableAllocator<A extends RetrievableAllocator<A>> extends CommonAllocator<A> |
| implements AddressTranslator, HandlerStore, Transaction { |
| |
| /** |
| * create a durable chunk that is managed by its holder. |
| * |
| * @param size |
| * specify the size of memory chunk |
| * |
| * @return a durable chunk contains a memory chunk |
| */ |
| public DurableChunk<A> createChunk(long size) { |
| return createChunk(size, true); |
| } |
| |
| /** |
| * create a durable chunk that is managed by its holder. |
| * |
| * @param size |
| * specify the size of memory chunk |
| * |
| * @param autoreclaim |
| * specify whether or not to reclaim this chunk automatically |
| * |
| * @return a durable chunk contains a memory chunk |
| */ |
| public DurableChunk<A> createChunk(long size, boolean autoreclaim) { |
| return createChunk(size, autoreclaim, null); |
| } |
| |
| /** |
| * create a durable chunk that is managed by its holder. |
| * |
| * @param size |
| * specify the size of memory chunk |
| * |
| * @param autoreclaim |
| * specify whether or not to reclaim this chunk automatically |
| * |
| * @param rctx |
| * specify a reclaim context |
| * |
| * @return a durable chunk contains a memory chunk |
| */ |
| @Override |
| public abstract DurableChunk<A> createChunk(long size, boolean autoreclaim, ReclaimContext rctx); |
| |
| /** |
| * create a durable buffer that is managed by its holder. |
| * |
| * @param size |
| * specify the size of memory buffer |
| * |
| * @return a durable buffer contains a memory buffer |
| */ |
| public DurableBuffer<A> createBuffer(long size) { |
| return createBuffer(size, true); |
| } |
| |
| /** |
| * create a durable buffer that is managed by its holder. |
| * |
| * @param size |
| * specify the size of memory buffer |
| * |
| * @param autoreclaim |
| * specify whether or not to reclaim this buffer automatically |
| * |
| * @return a durable buffer contains a memory buffer |
| */ |
| public DurableBuffer<A> createBuffer(long size, boolean autoreclaim) { |
| return createBuffer(size, autoreclaim, null); |
| } |
| |
| /** |
| * create a durable buffer that is managed by its holder. |
| * |
| * @param size |
| * specify the size of memory buffer |
| * |
| * @param autoreclaim |
| * specify whether or not to reclaim this buffer automatically |
| * |
| * @param rctx |
| * specify a reclaim context |
| * |
| * @return a durable buffer contains a memory buffer |
| */ |
| @Override |
| public abstract DurableBuffer<A> createBuffer(long size, boolean autoreclaim, ReclaimContext rctx); |
| |
| /** |
| * retrieve a memory buffer from its backed memory allocator. |
| * |
| * @param phandler |
| * specify the handler of memory buffer to retrieve |
| * |
| * @return a durable buffer contains the retrieved memory buffer |
| */ |
| public DurableBuffer<A> retrieveBuffer(long phandler) { |
| return retrieveBuffer(phandler, true); |
| } |
| |
| /** |
| * retrieve a memory chunk from its backed memory allocator. |
| * |
| * @param phandler |
| * specify the handler of memory chunk to retrieve |
| * |
| * @return a durable chunk contains the retrieved memory chunk |
| */ |
| public DurableChunk<A> retrieveChunk(long phandler) { |
| return retrieveChunk(phandler, true); |
| } |
| |
| /** |
| * retrieve a memory buffer from its backed memory allocator. |
| * |
| * @param phandler |
| * specify the handler of memory buffer to retrieve |
| * |
| * @param autoreclaim |
| * specify whether this retrieved memory buffer can be reclaimed |
| * automatically or not |
| * |
| * @return a durable buffer contains the retrieved memory buffer |
| */ |
| public DurableBuffer<A> retrieveBuffer(long phandler, boolean autoreclaim) { |
| return retrieveBuffer(phandler, autoreclaim, null); |
| } |
| |
| /** |
| * retrieve a memory chunk from its backed memory allocator. |
| * |
| * @param phandler |
| * specify the handler of memory chunk to retrieve |
| * |
| * @param autoreclaim |
| * specify whether this retrieved memory chunk can be reclaimed |
| * automatically or not |
| * |
| * @return a durable chunk contains the retrieved memory chunk |
| */ |
| public DurableChunk<A> retrieveChunk(long phandler, boolean autoreclaim) { |
| return retrieveChunk(phandler, autoreclaim, null); |
| } |
| |
| /** |
| * retrieve a memory buffer from its backed memory allocator. |
| * |
| * @param phandler |
| * specify the handler of memory buffer to retrieve |
| * |
| * @param autoreclaim |
| * specify whether this retrieved memory buffer can be reclaimed |
| * automatically or not |
| * |
| * @param rctx |
| * specify a reclaim context |
| * |
| * @return a durable buffer contains the retrieved memory buffer |
| */ |
| public abstract DurableBuffer<A> retrieveBuffer(long phandler, boolean autoreclaim, ReclaimContext rctx); |
| |
| /** |
| * retrieve a memory chunk from its backed memory allocator. |
| * |
| * @param phandler |
| * specify the handler of memory chunk to retrieve |
| * |
| * @param autoreclaim |
| * specify whether this retrieved memory chunk can be reclaimed |
| * automatically or not |
| * |
| * @param rctx |
| * specify a reclaim context |
| * |
| * @return a durable chunk contains the retrieved memory chunk |
| */ |
| public abstract DurableChunk<A> retrieveChunk(long phandler, boolean autoreclaim, ReclaimContext rctx); |
| |
| /** |
| * re-size a specified chunk on its backed memory pool. |
| * |
| * @param mholder |
| * the holder of memory chunk. |
| * |
| * @param size |
| * specify a new size of memory chunk |
| * |
| * @return the resized durable memory chunk handler |
| */ |
| @Override |
| public abstract DurableChunk<A> resizeChunk(MemChunkHolder<A> mholder, long size); |
| |
| /** |
| * resize a specified buffer on its backed memory pool. |
| * |
| * @param mholder |
| * the holder of memory buffer. it can be null. |
| * |
| * @param size |
| * specify a new size of memory chunk |
| * |
| * @return the resized durable memory buffer handler |
| * |
| */ |
| @Override |
| public abstract DurableBuffer<A> resizeBuffer(MemBufferHolder<A> mholder, long size); |
| |
| /** |
| * get the address from a memory buffer holder. |
| * |
| * @param mbuf |
| * specify the memory buffer holder |
| * |
| * @return an address that could be used to retrieve its memory buffer |
| */ |
| public abstract long getBufferAddress(MemBufferHolder<A> mbuf); |
| |
| /** |
| * get the address from a memory chunk holder. |
| * |
| * @param mchunk |
| * specify the memory chunk holder |
| * |
| * @return an address that could be used to retrieve its memory chunk |
| */ |
| public abstract long getChunkAddress(MemChunkHolder<A> mchunk); |
| |
| /** |
| * get the handler from a memory buffer holder. |
| * |
| * @param mbuf |
| * specify the memory buffer holder |
| * |
| * @return a handler that could be used to retrieve its memory buffer |
| */ |
| public long getBufferHandler(MemBufferHolder<A> mbuf) { |
| return getPortableAddress(getBufferAddress(mbuf)); |
| } |
| |
| /** |
| * get the handler from a memory chunk holder. |
| * |
| * @param mchunk |
| * specify the memory chunk holder |
| * |
| * @return a handler that could be used to retrieve its memory chunk |
| */ |
| public long getChunkHandler(MemChunkHolder<A> mchunk) { |
| return getPortableAddress(getChunkAddress(mchunk)); |
| } |
| |
| } |