| /* |
| * 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.tsfile.write.page; |
| |
| import org.apache.iotdb.tsfile.compress.ICompressor; |
| import org.apache.iotdb.tsfile.encoding.encoder.Encoder; |
| import org.apache.iotdb.tsfile.file.metadata.enums.CompressionType; |
| import org.apache.iotdb.tsfile.file.metadata.statistics.TimeStatistics; |
| import org.apache.iotdb.tsfile.utils.PublicBAOS; |
| import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.Channels; |
| import java.nio.channels.WritableByteChannel; |
| |
| /** |
| * This writer is used to write time into a page. It consists of a time encoder and respective |
| * OutputStream. |
| */ |
| public class TimePageWriter { |
| |
| private static final Logger logger = LoggerFactory.getLogger(TimePageWriter.class); |
| |
| private final ICompressor compressor; |
| |
| // time |
| private Encoder timeEncoder; |
| private final PublicBAOS timeOut; |
| |
| /** |
| * statistic of current page. It will be reset after calling {@code |
| * writePageHeaderAndDataIntoBuff()} |
| */ |
| private TimeStatistics statistics; |
| |
| public TimePageWriter(Encoder timeEncoder, ICompressor compressor) { |
| this.timeOut = new PublicBAOS(); |
| this.timeEncoder = timeEncoder; |
| this.statistics = new TimeStatistics(); |
| this.compressor = compressor; |
| } |
| |
| /** write a time into encoder */ |
| public void write(long time) { |
| timeEncoder.encode(time, timeOut); |
| statistics.update(time); |
| } |
| |
| /** write time series into encoder */ |
| public void write(long[] timestamps, int batchSize, int arrayOffset) { |
| for (int i = arrayOffset; i < batchSize + arrayOffset; i++) { |
| timeEncoder.encode(timestamps[i], timeOut); |
| } |
| if (batchSize != 0) { |
| statistics.update(timestamps, batchSize, arrayOffset); |
| } |
| } |
| |
| /** flush all data remained in encoders. */ |
| private void prepareEndWriteOnePage() throws IOException { |
| timeEncoder.flush(timeOut); |
| } |
| |
| /** |
| * getUncompressedBytes return data what it has been written in form of <code> |
| * size of time list, time list, value list</code> |
| * |
| * @return a new readable ByteBuffer whose position is 0. |
| */ |
| public ByteBuffer getUncompressedBytes() throws IOException { |
| prepareEndWriteOnePage(); |
| ByteBuffer buffer = ByteBuffer.allocate(timeOut.size()); |
| buffer.put(timeOut.getBuf(), 0, timeOut.size()); |
| buffer.flip(); |
| return buffer; |
| } |
| |
| /** write the page header and data into the PageWriter's output stream. */ |
| public int writePageHeaderAndDataIntoBuff(PublicBAOS pageBuffer, boolean first) |
| throws IOException { |
| if (statistics.getCount() == 0) { |
| return 0; |
| } |
| |
| ByteBuffer pageData = getUncompressedBytes(); |
| int uncompressedSize = pageData.remaining(); |
| int compressedSize; |
| byte[] compressedBytes = null; |
| |
| if (compressor.getType().equals(CompressionType.UNCOMPRESSED)) { |
| compressedSize = uncompressedSize; |
| } else if (compressor.getType().equals(CompressionType.GZIP)) { |
| compressedBytes = |
| compressor.compress(pageData.array(), pageData.position(), uncompressedSize); |
| compressedSize = compressedBytes.length; |
| } else { |
| compressedBytes = new byte[compressor.getMaxBytesForCompression(uncompressedSize)]; |
| // data is never a directByteBuffer now, so we can use data.array() |
| compressedSize = |
| compressor.compress( |
| pageData.array(), pageData.position(), uncompressedSize, compressedBytes); |
| } |
| |
| // write the page header to IOWriter |
| int sizeWithoutStatistic = 0; |
| if (first) { |
| sizeWithoutStatistic += |
| ReadWriteForEncodingUtils.writeUnsignedVarInt(uncompressedSize, pageBuffer); |
| sizeWithoutStatistic += |
| ReadWriteForEncodingUtils.writeUnsignedVarInt(compressedSize, pageBuffer); |
| } else { |
| ReadWriteForEncodingUtils.writeUnsignedVarInt(uncompressedSize, pageBuffer); |
| ReadWriteForEncodingUtils.writeUnsignedVarInt(compressedSize, pageBuffer); |
| statistics.serialize(pageBuffer); |
| } |
| |
| // write page content to temp PBAOS |
| logger.trace( |
| "start to flush a time page data into buffer, buffer position {} ", pageBuffer.size()); |
| if (compressor.getType().equals(CompressionType.UNCOMPRESSED)) { |
| try (WritableByteChannel channel = Channels.newChannel(pageBuffer)) { |
| channel.write(pageData); |
| } |
| } else { |
| pageBuffer.write(compressedBytes, 0, compressedSize); |
| } |
| logger.trace( |
| "finish flushing a time page data into buffer, buffer position {} ", pageBuffer.size()); |
| return sizeWithoutStatistic; |
| } |
| |
| /** |
| * calculate max possible memory size it occupies, including time outputStream and value |
| * outputStream, because size outputStream is never used until flushing. |
| * |
| * @return allocated size in time, value and outputStream |
| */ |
| public long estimateMaxMemSize() { |
| return timeOut.size() + timeEncoder.getMaxByteSize(); |
| } |
| |
| /** reset this page */ |
| public void reset() { |
| timeOut.reset(); |
| statistics = new TimeStatistics(); |
| } |
| |
| public void setTimeEncoder(Encoder encoder) { |
| this.timeEncoder = encoder; |
| } |
| |
| public void initStatistics() { |
| statistics = new TimeStatistics(); |
| } |
| |
| public long getPointNumber() { |
| return statistics.getCount(); |
| } |
| |
| public TimeStatistics getStatistics() { |
| return statistics; |
| } |
| } |