| /* |
| * 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.spark.shuffle.writer; |
| |
| import java.util.List; |
| |
| import com.google.common.collect.Lists; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class WriterBuffer { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(WriterBuffer.class); |
| private long copyTime = 0; |
| private byte[] buffer; |
| private int bufferSize; |
| private int nextOffset = 0; |
| private List<WrappedBuffer> buffers = Lists.newArrayList(); |
| private int dataLength = 0; |
| private int memoryUsed = 0; |
| private long recordCount = 0; |
| |
| public WriterBuffer(int bufferSize) { |
| this.bufferSize = bufferSize; |
| } |
| |
| public void addRecord(byte[] recordBuffer, int length) { |
| if (askForMemory(length)) { |
| // buffer has data already, add buffer to list |
| if (nextOffset > 0) { |
| buffers.add(new WrappedBuffer(buffer, nextOffset)); |
| nextOffset = 0; |
| } |
| int newBufferSize = Math.max(length, bufferSize); |
| buffer = new byte[newBufferSize]; |
| memoryUsed += newBufferSize; |
| } |
| |
| try { |
| System.arraycopy(recordBuffer, 0, buffer, nextOffset, length); |
| } catch (Exception e) { |
| LOG.error( |
| "Unexpected exception for System.arraycopy, length[" |
| + length |
| + "], nextOffset[" |
| + nextOffset |
| + "], bufferSize[" |
| + bufferSize |
| + "]"); |
| throw e; |
| } |
| |
| nextOffset += length; |
| dataLength += length; |
| recordCount++; |
| } |
| |
| public boolean askForMemory(long length) { |
| return buffer == null || nextOffset + length > bufferSize; |
| } |
| |
| public byte[] getData() { |
| byte[] data = new byte[dataLength]; |
| int offset = 0; |
| long start = System.currentTimeMillis(); |
| for (WrappedBuffer wrappedBuffer : buffers) { |
| System.arraycopy(wrappedBuffer.getBuffer(), 0, data, offset, wrappedBuffer.getSize()); |
| offset += wrappedBuffer.getSize(); |
| } |
| // nextOffset is the length of current buffer used |
| System.arraycopy(buffer, 0, data, offset, nextOffset); |
| copyTime += System.currentTimeMillis() - start; |
| return data; |
| } |
| |
| public int getDataLength() { |
| return dataLength; |
| } |
| |
| public long getCopyTime() { |
| return copyTime; |
| } |
| |
| public int getMemoryUsed() { |
| return memoryUsed; |
| } |
| |
| public long getRecordCount() { |
| return recordCount; |
| } |
| |
| private static final class WrappedBuffer { |
| |
| byte[] buffer; |
| int size; |
| |
| WrappedBuffer(byte[] buffer, int size) { |
| this.buffer = buffer; |
| this.size = size; |
| } |
| |
| public byte[] getBuffer() { |
| return buffer; |
| } |
| |
| public int getSize() { |
| return size; |
| } |
| } |
| } |