| /* |
| * 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 java.lang.reflect.Field; |
| import java.nio.Buffer; |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| |
| /** |
| * This class used to present a region of DurableChunk as a buffer. |
| */ |
| public class ChunkBuffer<A extends RetrievableAllocator<A>> { |
| |
| protected DurableChunk<A> m_dchunk = null; |
| protected ByteBuffer m_buffer = null; |
| protected long m_offset; |
| protected int m_size; |
| |
| public ChunkBuffer(DurableChunk<A> dchunk, long offset, int size) { |
| Field address, capacity; |
| m_dchunk = dchunk; |
| if (null != dchunk && size > 0 && offset >= 0 |
| && offset + size <= dchunk.getSize()) { |
| ByteBuffer bb = ByteBuffer.allocateDirect(0).order(ByteOrder.nativeOrder()); |
| try { |
| address = Buffer.class.getDeclaredField("address"); |
| address.setAccessible(true); |
| capacity = Buffer.class.getDeclaredField("capacity"); |
| capacity.setAccessible(true); |
| address.setLong(bb, dchunk.get() + offset); |
| capacity.setInt(bb, size); |
| bb.limit(size); |
| m_buffer = bb; |
| m_offset = offset; |
| m_size = size; |
| } catch (NoSuchFieldException e) { |
| throw new ConfigurationException("Buffer fields not found."); |
| } catch (IllegalAccessException e) { |
| throw new ConfigurationException("Buffer fields cannot be accessed."); |
| } |
| } else { |
| throw new OutOfBoundsException("The ChunkBuffer is out of bounds of its backed DurableChunk."); |
| } |
| } |
| |
| public ByteBuffer get() { |
| return m_buffer; |
| } |
| |
| public DurableChunk<A> getChunk() { |
| return m_dchunk; |
| } |
| |
| public void syncToNonVolatileMemory() { |
| if (m_dchunk.getAllocator() instanceof NonVolatileMemAllocator) { |
| NonVolatileMemAllocator alloc = (NonVolatileMemAllocator) m_dchunk.getAllocator(); |
| alloc.syncToNonVolatileMemory(m_dchunk.get() + m_offset, m_size, false); |
| } else { |
| throw new UnsupportedOperationException("The ChunkBuffer does not backed by a non-volatile allocator"); |
| } |
| } |
| |
| public void syncToNonVolatileMemory(long offset, int length) { |
| if (offset < 0 || length < 0 || offset + length > this.m_size) { |
| throw new OutOfBoundsException("The requested offset and length are out of bounds for this buffer: length = " |
| + length + " , offset = " + offset); |
| } |
| if (m_dchunk.getAllocator() instanceof NonVolatileMemAllocator) { |
| NonVolatileMemAllocator alloc = (NonVolatileMemAllocator) m_dchunk.getAllocator(); |
| alloc.syncToNonVolatileMemory(m_dchunk.get() + m_offset + offset, length, false); |
| } else { |
| throw new UnsupportedOperationException("The ChunkBuffer does not backed by a non-volatile allocator"); |
| } |
| } |
| |
| public void syncToVolatileMemory() { |
| m_dchunk.getAllocator().syncToVolatileMemory(m_dchunk.get() + m_offset, m_size, false); |
| } |
| |
| public void syncToVolatileMemory(long offset, int length) { |
| if (offset < 0 || length < 0 || offset + length > this.m_size) { |
| throw new OutOfBoundsException("The requested offset and length are out of bounds for this buffer: length = " |
| + length + " , offset = " + offset); |
| } |
| m_dchunk.getAllocator().syncToVolatileMemory(m_dchunk.get() + m_offset + offset, length, false); |
| } |
| |
| public void syncToLocal() { |
| if (m_dchunk.getAllocator() instanceof NonVolatileMemAllocator) { |
| NonVolatileMemAllocator alloc = (NonVolatileMemAllocator) m_dchunk.getAllocator(); |
| alloc.syncToLocal(m_dchunk.get() + m_offset, m_size, false); |
| } else { |
| throw new UnsupportedOperationException("The ChunkBuffer does not backed by a non-volatile allocator"); |
| } |
| } |
| |
| public void syncToLocal(long offset, int length) { |
| if (offset < 0 || length < 0 || offset + length > this.m_size) { |
| throw new OutOfBoundsException("The requested offset and length are out of bounds for this buffer: length = " |
| + length + " , offset = " + offset); |
| } |
| if (m_dchunk.getAllocator() instanceof NonVolatileMemAllocator) { |
| NonVolatileMemAllocator alloc = (NonVolatileMemAllocator) m_dchunk.getAllocator(); |
| alloc.syncToLocal(m_dchunk.get() + m_offset + offset, length, false); |
| } else { |
| throw new UnsupportedOperationException("The ChunkBuffer does not backed by a non-volatile allocator"); |
| } |
| } |
| |
| } |
| |