| /** |
| * 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.hadoop.hbase.regionserver.wal; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.PushbackInputStream; |
| |
| import javax.annotation.Nonnull; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.Cell; |
| import org.apache.hadoop.hbase.codec.Codec; |
| |
| /** |
| * This class is a copy paste version of org.apache.hadoop.hbase.codec.BaseDecoder class. |
| * This class is meant to be used in {@link IndexedWALEditCodec} when runtime version of |
| * HBase is older than 1.1.3. This is needed to handle binary incompatibility introduced by |
| * HBASE-14501. See PHOENIX-2629 and PHOENIX-2636 for details. |
| */ |
| public abstract class BinaryCompatibleBaseDecoder implements Codec.Decoder { |
| protected static final Log LOG = LogFactory.getLog(BinaryCompatibleBaseDecoder.class); |
| |
| protected final InputStream in; |
| private Cell current = null; |
| |
| protected static class PBIS extends PushbackInputStream { |
| public PBIS(InputStream in, int size) { |
| super(in, size); |
| } |
| |
| public void resetBuf(int size) { |
| this.buf = new byte[size]; |
| this.pos = size; |
| } |
| } |
| |
| public BinaryCompatibleBaseDecoder(final InputStream in) { |
| this.in = new PBIS(in, 1); |
| } |
| |
| @Override |
| public boolean advance() throws IOException { |
| int firstByte = in.read(); |
| if (firstByte == -1) { |
| return false; |
| } else { |
| ((PBIS)in).unread(firstByte); |
| } |
| |
| try { |
| this.current = parseCell(); |
| } catch (IOException ioEx) { |
| ((PBIS)in).resetBuf(1); // reset the buffer in case the underlying stream is read from upper layers |
| rethrowEofException(ioEx); |
| } |
| return true; |
| } |
| |
| private void rethrowEofException(IOException ioEx) throws IOException { |
| boolean isEof = false; |
| try { |
| isEof = this.in.available() == 0; |
| } catch (Throwable t) { |
| LOG.trace("Error getting available for error message - ignoring", t); |
| } |
| if (!isEof) throw ioEx; |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("Partial cell read caused by EOF", ioEx); |
| } |
| EOFException eofEx = new EOFException("Partial cell read"); |
| eofEx.initCause(ioEx); |
| throw eofEx; |
| } |
| |
| protected InputStream getInputStream() { |
| return in; |
| } |
| |
| /** |
| * Extract a Cell. |
| * @return a parsed Cell or throws an Exception. EOFException or a generic IOException maybe |
| * thrown if EOF is reached prematurely. Does not return null. |
| * @throws IOException |
| */ |
| @Nonnull |
| protected abstract Cell parseCell() throws IOException; |
| |
| @Override |
| public Cell current() { |
| return this.current; |
| } |
| } |