| /* |
| * 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.iotdb.db.utils.sort; |
| |
| import org.apache.iotdb.db.conf.IoTDBDescriptor; |
| import org.apache.iotdb.tsfile.common.conf.TSFileDescriptor; |
| |
| public class SortBufferManager { |
| private static final int DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES = |
| TSFileDescriptor.getInstance().getConfig().getMaxTsBlockSizeInBytes(); |
| |
| public static final long SORT_BUFFER_SIZE = |
| IoTDBDescriptor.getInstance().getConfig().getSortBufferSize(); |
| |
| private long bufferUsed; |
| |
| private static final long BUFFER_SIZE_FOR_ONE_BRANCH = DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES; |
| |
| private final long bufferAvailableForAllBranch; |
| private long readerBuffer = 0; |
| private long branchNum = 0; |
| |
| public SortBufferManager() { |
| this.bufferAvailableForAllBranch = SORT_BUFFER_SIZE - DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES; |
| // the initial value is the buffer for output. |
| this.bufferUsed = DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES; |
| } |
| |
| public void allocateOneSortBranch() { |
| boolean success = allocate(BUFFER_SIZE_FOR_ONE_BRANCH); |
| if (!success) { |
| throw new IllegalArgumentException("Not enough memory for sorting"); |
| } |
| branchNum++; |
| } |
| |
| private boolean check(long size) { |
| return bufferUsed + size < SORT_BUFFER_SIZE; |
| } |
| |
| public boolean allocate(long size) { |
| if (check(size)) { |
| bufferUsed += size; |
| return true; |
| } |
| return false; |
| } |
| |
| public void releaseOneSortBranch() { |
| branchNum--; |
| if (branchNum != 0) { |
| readerBuffer = bufferAvailableForAllBranch / branchNum; |
| } |
| } |
| |
| public long getReaderBufferAvailable() { |
| if (readerBuffer != 0) { |
| return readerBuffer; |
| } |
| readerBuffer = bufferAvailableForAllBranch / branchNum; |
| return readerBuffer; |
| } |
| } |