| /* |
| * 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.enums.TSDataType; |
| import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics; |
| import org.apache.iotdb.tsfile.utils.Binary; |
| import org.apache.iotdb.tsfile.utils.PublicBAOS; |
| import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils; |
| import org.apache.iotdb.tsfile.write.schema.IMeasurementSchema; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.Channels; |
| import java.nio.channels.WritableByteChannel; |
| |
| /** |
| * This writer is used to write time-value into a page. It consists of a time encoder, a value |
| * encoder and respective OutputStream. |
| */ |
| public class PageWriter { |
| |
| private static final Logger logger = LoggerFactory.getLogger(PageWriter.class); |
| |
| private ICompressor compressor; |
| |
| // time |
| private Encoder timeEncoder; |
| private PublicBAOS timeOut; |
| // value |
| private Encoder valueEncoder; |
| private PublicBAOS valueOut; |
| |
| /** |
| * statistic of current page. It will be reset after calling {@code |
| * writePageHeaderAndDataIntoBuff()} |
| */ |
| private Statistics<? extends Serializable> statistics; |
| |
| public PageWriter() { |
| this(null, null); |
| } |
| |
| public PageWriter(IMeasurementSchema measurementSchema) { |
| this(measurementSchema.getTimeEncoder(), measurementSchema.getValueEncoder()); |
| this.statistics = Statistics.getStatsByType(measurementSchema.getType()); |
| this.compressor = ICompressor.getCompressor(measurementSchema.getCompressor()); |
| } |
| |
| private PageWriter(Encoder timeEncoder, Encoder valueEncoder) { |
| this.timeOut = new PublicBAOS(); |
| this.valueOut = new PublicBAOS(); |
| this.timeEncoder = timeEncoder; |
| this.valueEncoder = valueEncoder; |
| } |
| |
| /** write a time value pair into encoder */ |
| public void write(long time, boolean value) { |
| timeEncoder.encode(time, timeOut); |
| valueEncoder.encode(value, valueOut); |
| statistics.update(time, value); |
| } |
| |
| /** write a time value pair into encoder */ |
| public void write(long time, short value) { |
| timeEncoder.encode(time, timeOut); |
| valueEncoder.encode(value, valueOut); |
| statistics.update(time, value); |
| } |
| |
| /** write a time value pair into encoder */ |
| public void write(long time, int value) { |
| timeEncoder.encode(time, timeOut); |
| valueEncoder.encode(value, valueOut); |
| statistics.update(time, value); |
| } |
| |
| /** write a time value pair into encoder */ |
| public void write(long time, long value) { |
| timeEncoder.encode(time, timeOut); |
| valueEncoder.encode(value, valueOut); |
| statistics.update(time, value); |
| } |
| |
| /** write a time value pair into encoder */ |
| public void write(long time, float value) { |
| timeEncoder.encode(time, timeOut); |
| valueEncoder.encode(value, valueOut); |
| statistics.update(time, value); |
| } |
| |
| /** write a time value pair into encoder */ |
| public void write(long time, double value) { |
| timeEncoder.encode(time, timeOut); |
| valueEncoder.encode(value, valueOut); |
| statistics.update(time, value); |
| } |
| |
| /** write a time value pair into encoder */ |
| public void write(long time, Binary value) { |
| timeEncoder.encode(time, timeOut); |
| valueEncoder.encode(value, valueOut); |
| statistics.update(time, value); |
| } |
| |
| /** write time series into encoder */ |
| public void write(long[] timestamps, boolean[] values, int batchSize) { |
| for (int i = 0; i < batchSize; i++) { |
| timeEncoder.encode(timestamps[i], timeOut); |
| valueEncoder.encode(values[i], valueOut); |
| } |
| statistics.update(timestamps, values, batchSize); |
| } |
| |
| /** write time series into encoder */ |
| public void write(long[] timestamps, int[] values, int batchSize) { |
| for (int i = 0; i < batchSize; i++) { |
| timeEncoder.encode(timestamps[i], timeOut); |
| valueEncoder.encode(values[i], valueOut); |
| } |
| statistics.update(timestamps, values, batchSize); |
| } |
| |
| /** write time series into encoder */ |
| public void write(long[] timestamps, long[] values, int batchSize) { |
| for (int i = 0; i < batchSize; i++) { |
| timeEncoder.encode(timestamps[i], timeOut); |
| valueEncoder.encode(values[i], valueOut); |
| } |
| statistics.update(timestamps, values, batchSize); |
| } |
| |
| /** write time series into encoder */ |
| public void write(long[] timestamps, float[] values, int batchSize) { |
| for (int i = 0; i < batchSize; i++) { |
| timeEncoder.encode(timestamps[i], timeOut); |
| valueEncoder.encode(values[i], valueOut); |
| } |
| statistics.update(timestamps, values, batchSize); |
| } |
| |
| /** write time series into encoder */ |
| public void write(long[] timestamps, double[] values, int batchSize) { |
| for (int i = 0; i < batchSize; i++) { |
| timeEncoder.encode(timestamps[i], timeOut); |
| valueEncoder.encode(values[i], valueOut); |
| } |
| statistics.update(timestamps, values, batchSize); |
| } |
| |
| /** write time series into encoder */ |
| public void write(long[] timestamps, Binary[] values, int batchSize) { |
| for (int i = 0; i < batchSize; i++) { |
| timeEncoder.encode(timestamps[i], timeOut); |
| valueEncoder.encode(values[i], valueOut); |
| } |
| statistics.update(timestamps, values, batchSize); |
| } |
| |
| /** flush all data remained in encoders. */ |
| private void prepareEndWriteOnePage() throws IOException { |
| timeEncoder.flush(timeOut); |
| valueEncoder.flush(valueOut); |
| } |
| |
| /** |
| * 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() + valueOut.size() + 4); |
| ReadWriteForEncodingUtils.writeUnsignedVarInt(timeOut.size(), buffer); |
| buffer.put(timeOut.getBuf(), 0, timeOut.size()); |
| buffer.put(valueOut.getBuf(), 0, valueOut.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 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("start to flush a 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() |
| + valueOut.size() |
| + timeEncoder.getMaxByteSize() |
| + valueEncoder.getMaxByteSize(); |
| } |
| |
| /** reset this page */ |
| public void reset(IMeasurementSchema measurementSchema) { |
| timeOut.reset(); |
| valueOut.reset(); |
| statistics = Statistics.getStatsByType(measurementSchema.getType()); |
| } |
| |
| public void setTimeEncoder(Encoder encoder) { |
| this.timeEncoder = encoder; |
| } |
| |
| public void setValueEncoder(Encoder encoder) { |
| this.valueEncoder = encoder; |
| } |
| |
| public void initStatistics(TSDataType dataType) { |
| statistics = Statistics.getStatsByType(dataType); |
| } |
| |
| public long getPointNumber() { |
| return statistics.getCount(); |
| } |
| |
| public Statistics<? extends Serializable> getStatistics() { |
| return statistics; |
| } |
| } |