| /** |
| * 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.distributedlog; |
| |
| import static org.apache.distributedlog.LogRecord.MAX_LOGRECORDSET_SIZE; |
| import static org.apache.distributedlog.LogRecord.MAX_LOGRECORD_SIZE; |
| import static org.apache.distributedlog.LogRecordSet.COMPRESSED_SIZE_OFFSET; |
| import static org.apache.distributedlog.LogRecordSet.COUNT_OFFSET; |
| import static org.apache.distributedlog.LogRecordSet.DECOMPRESSED_SIZE_OFFSET; |
| import static org.apache.distributedlog.LogRecordSet.HEADER_LEN; |
| import static org.apache.distributedlog.LogRecordSet.METADATA_COMPRESSION_MASK; |
| import static org.apache.distributedlog.LogRecordSet.METADATA_OFFSET; |
| import static org.apache.distributedlog.LogRecordSet.METADATA_VERSION_MASK; |
| import static org.apache.distributedlog.LogRecordSet.VERSION; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.PooledByteBufAllocator; |
| import io.netty.util.ReferenceCountUtil; |
| import java.nio.ByteBuffer; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.concurrent.CompletableFuture; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.distributedlog.exceptions.LogRecordTooLongException; |
| import org.apache.distributedlog.exceptions.WriteException; |
| import org.apache.distributedlog.io.Buffer; |
| import org.apache.distributedlog.io.CompressionCodec; |
| import org.apache.distributedlog.io.CompressionCodec.Type; |
| import org.apache.distributedlog.io.CompressionUtils; |
| |
| /** |
| * {@link Buffer} based log record set writer. |
| */ |
| @Slf4j |
| class EnvelopedRecordSetWriter implements LogRecordSet.Writer { |
| |
| private final ByteBuf buffer; |
| private final List<CompletableFuture<DLSN>> promiseList; |
| private final CompressionCodec.Type codec; |
| private final int metadata; |
| private final int codecCode; |
| private int count = 0; |
| private ByteBuf recordSetBuffer = null; |
| |
| EnvelopedRecordSetWriter(int initialBufferSize, |
| CompressionCodec.Type codec) { |
| this.buffer = PooledByteBufAllocator.DEFAULT.buffer( |
| Math.max(initialBufferSize, HEADER_LEN), |
| MAX_LOGRECORDSET_SIZE); |
| this.promiseList = new LinkedList<CompletableFuture<DLSN>>(); |
| this.codec = codec; |
| this.codecCode = codec.code(); |
| this.metadata = (VERSION & METADATA_VERSION_MASK) | (codecCode & METADATA_COMPRESSION_MASK); |
| this.buffer.writeInt(metadata); |
| this.buffer.writeInt(0); // count |
| this.buffer.writeInt(0); // original len |
| this.buffer.writeInt(0); // actual len |
| } |
| |
| synchronized List<CompletableFuture<DLSN>> getPromiseList() { |
| return promiseList; |
| } |
| |
| @Override |
| public synchronized void writeRecord(ByteBuffer record, |
| CompletableFuture<DLSN> transmitPromise) |
| throws LogRecordTooLongException, WriteException { |
| int logRecordSize = record.remaining(); |
| if (logRecordSize > MAX_LOGRECORD_SIZE) { |
| throw new LogRecordTooLongException( |
| "Log Record of size " + logRecordSize + " written when only " |
| + MAX_LOGRECORD_SIZE + " is allowed"); |
| } |
| buffer.writeInt(logRecordSize); |
| buffer.writeBytes(record); |
| ++count; |
| promiseList.add(transmitPromise); |
| } |
| |
| private synchronized void satisfyPromises(long lssn, long entryId, long startSlotId) { |
| long nextSlotId = startSlotId; |
| for (CompletableFuture<DLSN> promise : promiseList) { |
| promise.complete(new DLSN(lssn, entryId, nextSlotId)); |
| nextSlotId++; |
| } |
| promiseList.clear(); |
| } |
| |
| private synchronized void cancelPromises(Throwable reason) { |
| for (CompletableFuture<DLSN> promise : promiseList) { |
| promise.completeExceptionally(reason); |
| } |
| promiseList.clear(); |
| } |
| |
| @Override |
| public int getNumBytes() { |
| return buffer.readableBytes(); |
| } |
| |
| @Override |
| public synchronized int getNumRecords() { |
| return count; |
| } |
| |
| @Override |
| public synchronized ByteBuf getBuffer() { |
| if (null == recordSetBuffer) { |
| recordSetBuffer = createBuffer(); |
| } |
| return recordSetBuffer.retainedSlice(); |
| } |
| |
| ByteBuf createBuffer() { |
| int dataOffset = HEADER_LEN; |
| int dataLen = buffer.readableBytes() - HEADER_LEN; |
| |
| if (Type.NONE.code() == codecCode) { |
| // update count |
| buffer.setInt(COUNT_OFFSET, count); |
| // update data len |
| buffer.setInt(DECOMPRESSED_SIZE_OFFSET, dataLen); |
| buffer.setInt(COMPRESSED_SIZE_OFFSET, dataLen); |
| return buffer.retain(); |
| } |
| |
| // compression |
| |
| CompressionCodec compressor = |
| CompressionUtils.getCompressionCodec(codec); |
| ByteBuf uncompressedBuf = buffer.slice(dataOffset, dataLen); |
| ByteBuf compressedBuf = compressor.compress(uncompressedBuf, HEADER_LEN); |
| compressedBuf.setInt(METADATA_OFFSET, metadata); |
| // update count |
| compressedBuf.setInt(COUNT_OFFSET, count); |
| // update data len |
| compressedBuf.setInt(DECOMPRESSED_SIZE_OFFSET, dataLen); |
| compressedBuf.setInt(COMPRESSED_SIZE_OFFSET, compressedBuf.readableBytes() - HEADER_LEN); |
| |
| return compressedBuf; |
| } |
| |
| @Override |
| public synchronized void completeTransmit(long lssn, long entryId, long startSlotId) { |
| satisfyPromises(lssn, entryId, startSlotId); |
| buffer.release(); |
| ReferenceCountUtil.release(recordSetBuffer); |
| } |
| |
| @Override |
| public synchronized void abortTransmit(Throwable reason) { |
| cancelPromises(reason); |
| buffer.release(); |
| ReferenceCountUtil.release(recordSetBuffer); |
| } |
| } |