| /* |
| * 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.drill.exec.vector; |
| |
| import io.netty.buffer.DrillBuf; |
| |
| import java.util.Set; |
| |
| import org.apache.drill.exec.memory.BufferAllocator; |
| import org.apache.drill.exec.memory.AllocationManager.BufferLedger; |
| import org.apache.drill.exec.record.MaterializedField; |
| |
| |
| public abstract class BaseDataValueVector extends BaseValueVector { |
| |
| protected final static byte[] emptyByteArray = new byte[0]; // Nullable vectors use this |
| |
| protected DrillBuf data; |
| |
| public BaseDataValueVector(MaterializedField field, BufferAllocator allocator) { |
| super(field, allocator); |
| data = allocator.getEmpty(); |
| } |
| |
| /** |
| * Core of vector allocation. Given a new size (which must be a power of two), allocate |
| * the new buffer, copy the current values, and leave the unused parts garbage-filled. |
| * |
| * @param newAllocationSize new buffer size as a power of two |
| * @return the new buffer |
| */ |
| |
| public abstract DrillBuf reallocRaw(int newAllocationSize); |
| |
| @Override |
| public void clear() { |
| if (data != null) { |
| data.release(); |
| } |
| data = allocator.getEmpty(); |
| super.clear(); |
| } |
| |
| @Override |
| public void close() { |
| clear(); |
| if (data != null) { |
| data.release(); |
| data = null; |
| } |
| super.close(); |
| } |
| |
| @Override |
| public DrillBuf[] getBuffers(boolean clear) { |
| DrillBuf[] out; |
| if (getBufferSize() == 0) { |
| out = new DrillBuf[0]; |
| } else { |
| out = new DrillBuf[]{data}; |
| data.readerIndex(0); |
| if (clear) { |
| data.retain(1); |
| } |
| } |
| if (clear) { |
| clear(); |
| } |
| return out; |
| } |
| |
| @Override |
| public int getBufferSize() { |
| if (getAccessor().getValueCount() == 0) { |
| return 0; |
| } |
| return data.writerIndex(); |
| } |
| |
| @Override |
| public int getAllocatedSize() { |
| return data.capacity(); |
| } |
| |
| public DrillBuf getBuffer() { return data; } |
| |
| /** |
| * This method has a similar effect of allocateNew() without actually clearing and reallocating |
| * the value vector. The purpose is to move the value vector to a "mutate" state |
| */ |
| public void reset() {} |
| |
| @Override |
| public void exchange(ValueVector other) { |
| |
| // Exchange the data buffers |
| |
| BaseDataValueVector target = (BaseDataValueVector) other; |
| DrillBuf temp = data; |
| data = target.data; |
| target.data = temp; |
| getReader().reset(); |
| getMutator().exchange(target.getMutator()); |
| // No state in an Accessor to reset |
| } |
| |
| @Override |
| public void collectLedgers(Set<BufferLedger> ledgers) { |
| BufferLedger ledger = data.getLedger(); |
| if (ledger != null) { |
| ledgers.add(ledger); |
| } |
| } |
| } |