| /* |
| * 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.rocketmq.tieredstore.provider.inputstream; |
| |
| import org.apache.rocketmq.tieredstore.provider.TieredFileSegment; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| |
| public class TieredFileSegmentInputStream extends InputStream { |
| |
| private final TieredFileSegment.FileSegmentType fileType; |
| protected final List<ByteBuffer> uploadBufferList; |
| protected final int contentLength; |
| |
| /** |
| * readPosition is the now position in the stream |
| */ |
| protected int readPosition = 0; |
| |
| /** |
| * curReadBufferIndex is the index of the buffer in uploadBufferList which is being read |
| */ |
| protected int curReadBufferIndex = 0; |
| /** |
| * readPosInCurBuffer is the position in the buffer which is being read |
| */ |
| protected int readPosInCurBuffer = 0; |
| |
| /** |
| * curBuffer is the buffer which is being read, it is the same as uploadBufferList.get(curReadBufferIndex) |
| */ |
| protected ByteBuffer curBuffer; |
| |
| private int markReadPosition = -1; |
| |
| private int markCurReadBufferIndex = -1; |
| |
| private int markReadPosInCurBuffer = -1; |
| |
| public TieredFileSegmentInputStream(TieredFileSegment.FileSegmentType fileType, List<ByteBuffer> uploadBufferList, |
| int contentLength) { |
| this.fileType = fileType; |
| this.contentLength = contentLength; |
| this.uploadBufferList = uploadBufferList; |
| if (uploadBufferList.size() > 0) { |
| this.curBuffer = uploadBufferList.get(curReadBufferIndex); |
| } |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return true; |
| } |
| |
| @Override |
| public synchronized void mark(int ignore) { |
| this.markReadPosition = readPosition; |
| this.markCurReadBufferIndex = curReadBufferIndex; |
| this.markReadPosInCurBuffer = readPosInCurBuffer; |
| } |
| |
| @Override |
| public synchronized void reset() throws IOException { |
| if (this.markReadPosition == -1) { |
| throw new IOException("mark not set"); |
| } |
| this.readPosition = markReadPosition; |
| this.curReadBufferIndex = markCurReadBufferIndex; |
| this.readPosInCurBuffer = markReadPosInCurBuffer; |
| if (this.curReadBufferIndex < uploadBufferList.size()) { |
| this.curBuffer = uploadBufferList.get(curReadBufferIndex); |
| } |
| } |
| |
| @Override |
| public int available() { |
| return contentLength - readPosition; |
| } |
| |
| public List<ByteBuffer> getUploadBufferList() { |
| return uploadBufferList; |
| } |
| |
| public ByteBuffer getCodaBuffer() { |
| return null; |
| } |
| |
| @Override |
| public int read() { |
| if (available() <= 0) { |
| return -1; |
| } |
| readPosition++; |
| if (readPosInCurBuffer >= curBuffer.remaining()) { |
| curReadBufferIndex++; |
| if (curReadBufferIndex >= uploadBufferList.size()) { |
| return -1; |
| } |
| curBuffer = uploadBufferList.get(curReadBufferIndex); |
| readPosInCurBuffer = 0; |
| } |
| return curBuffer.get(readPosInCurBuffer++) & 0xff; |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) { |
| if (b == null) { |
| throw new NullPointerException(); |
| } else if (off < 0 || len < 0 || len > b.length - off) { |
| throw new IndexOutOfBoundsException("off < 0 || len < 0 || len > b.length - off"); |
| } |
| if (readPosition >= contentLength) { |
| return -1; |
| } |
| |
| int available = available(); |
| if (len > available) { |
| len = available; |
| } |
| if (len <= 0) { |
| return 0; |
| } |
| int needRead = len; |
| int pos = readPosition; |
| int bufIndex = curReadBufferIndex; |
| int posInCurBuffer = readPosInCurBuffer; |
| ByteBuffer curBuf = curBuffer; |
| while (needRead > 0 && bufIndex < uploadBufferList.size()) { |
| curBuf = uploadBufferList.get(bufIndex); |
| int remaining = curBuf.remaining() - posInCurBuffer; |
| int readLen = remaining < needRead ? remaining : needRead; |
| // read from curBuf |
| curBuf.position(posInCurBuffer); |
| curBuf.get(b, off, readLen); |
| curBuf.position(0); |
| // update flags |
| off += readLen; |
| needRead -= readLen; |
| pos += readLen; |
| posInCurBuffer += readLen; |
| if (posInCurBuffer == curBuffer.remaining()) { |
| // read from next buf |
| bufIndex++; |
| posInCurBuffer = 0; |
| } |
| } |
| readPosition = pos; |
| curReadBufferIndex = bufIndex; |
| readPosInCurBuffer = posInCurBuffer; |
| curBuffer = curBuf; |
| return len; |
| } |
| } |
| |