| /* |
| * 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.datasketches.memory; |
| |
| import java.nio.ByteOrder; |
| |
| /** |
| * Implementation of {@link WritableBuffer} for direct memory, native byte order. |
| * |
| * @author Roman Leventov |
| * @author Lee Rhodes |
| */ |
| final class DirectWritableBufferImpl extends WritableBufferImpl { |
| private static final int id = BUFFER | NATIVE | DIRECT; |
| private final long nativeBaseOffset; //used to compute cumBaseOffset |
| private final StepBoolean valid; //a reference only |
| private MemoryRequestServer memReqSvr = null; //cannot be final; |
| private final byte typeId; |
| |
| DirectWritableBufferImpl( |
| final long nativeBaseOffset, |
| final long regionOffset, |
| final long capacityBytes, |
| final int typeId, |
| final StepBoolean valid, |
| final MemoryRequestServer memReqSvr, |
| final BaseWritableMemoryImpl originMemory) { |
| super(null, nativeBaseOffset, regionOffset, capacityBytes, originMemory); |
| this.nativeBaseOffset = nativeBaseOffset; |
| this.valid = valid; |
| assert memReqSvr != null; |
| this.memReqSvr = memReqSvr; //should not be null |
| this.typeId = (byte) (id | (typeId & 0x7)); |
| } |
| |
| @Override |
| BaseWritableBufferImpl toWritableRegion(final long offsetBytes, final long capacityBytes, |
| final boolean readOnly, final ByteOrder byteOrder) { |
| final int type = typeId | REGION | (readOnly ? READONLY : 0); |
| return isNativeByteOrder(byteOrder) |
| ? new DirectWritableBufferImpl( |
| nativeBaseOffset, getRegionOffset(offsetBytes), capacityBytes, |
| type, valid, memReqSvr, originMemory) |
| : new DirectNonNativeWritableBufferImpl( |
| nativeBaseOffset, getRegionOffset(offsetBytes), capacityBytes, |
| type, valid, memReqSvr, originMemory); |
| } |
| |
| @Override |
| BaseWritableBufferImpl toDuplicate(final boolean readOnly, final ByteOrder byteOrder) { |
| final int type = typeId | DUPLICATE | (readOnly ? READONLY : 0); |
| return isNativeByteOrder(byteOrder) |
| ? new DirectWritableBufferImpl( |
| nativeBaseOffset, getRegionOffset(), getCapacity(), |
| type, valid, memReqSvr, originMemory) |
| : new DirectNonNativeWritableBufferImpl( |
| nativeBaseOffset, getRegionOffset(), getCapacity(), |
| type, valid, memReqSvr, originMemory); |
| } |
| |
| @Override |
| public MemoryRequestServer getMemoryRequestServer() { |
| assertValid(); |
| return memReqSvr; //cannot be null |
| } |
| |
| @Override |
| long getNativeBaseOffset() { |
| return nativeBaseOffset; |
| } |
| |
| @Override |
| int getTypeId() { |
| return typeId & 0xff; |
| } |
| |
| @Override |
| public boolean isValid() { |
| return valid.get(); |
| } |
| |
| } |