/*
* 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.flume.channel.file;
import java.io.EOFException;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Represents a single data file on disk. Has methods to write,
* read sequentially (replay), and read randomly (channel takes).
*/
@Deprecated
class LogFileV2 extends LogFile {
protected static final Logger LOGGER =
LoggerFactory.getLogger(LogFileV2.class);
private static final long OFFSET_CHECKPOINT = 2 * Serialization.SIZE_OF_INT;
private LogFileV2() {}
static class MetaDataWriter extends LogFile.MetaDataWriter {
protected MetaDataWriter(File file, int logFileID) throws IOException {
super(file, logFileID);
boolean error = true;
try {
RandomAccessFile writeFileHandle = getFileHandle();
int version = writeFileHandle.readInt();
if (version != getVersion()) {
throw new IOException("The version of log file: "
+ file.getCanonicalPath() + " is different from expected "
+ " version: expected = " + getVersion() + ", found = " + version);
}
int fid = writeFileHandle.readInt();
if (fid != logFileID) {
throw new IOException("The file id of log file: "
+ file.getCanonicalPath() + " is different from expected "
+ " id: expected = " + logFileID + ", found = " + fid);
}
setLastCheckpointOffset(writeFileHandle.readLong());
setLastCheckpointWriteOrderID(writeFileHandle.readLong());
LOGGER.info("File: " + file.getCanonicalPath() + " was last checkpointed "
+ "at position: " + getLastCheckpointOffset()
+ ", logWriteOrderID: " + getLastCheckpointWriteOrderID());
error = false;
} finally {
if(error) {
close();
}
}
}
@Override
int getVersion() {
return Serialization.VERSION_2;
}
@Override
void markCheckpoint(long currentPosition, long logWriteOrderID)
throws IOException {
RandomAccessFile writeFileHandle = getFileHandle();
writeFileHandle.seek(OFFSET_CHECKPOINT);
writeFileHandle.writeLong(currentPosition);
writeFileHandle.writeLong(logWriteOrderID);
writeFileHandle.getChannel().force(true);
LOGGER.info("Noted checkpoint for file: " + getFile() + ", id: "
+ getLogFileID() + ", checkpoint position: " + currentPosition
+ ", logWriteOrderID: " + logWriteOrderID);
}
}
static class Writer extends LogFile.Writer {
Writer(File file, int logFileID, long maxFileSize,
long usableSpaceRefreshInterval)
throws IOException {
super(file, logFileID, maxFileSize, null, usableSpaceRefreshInterval,
true, 0);
RandomAccessFile writeFileHandle = getFileHandle();
writeFileHandle.writeInt(getVersion());
writeFileHandle.writeInt(logFileID);
// checkpoint marker
writeFileHandle.writeLong(0L);
// timestamp placeholder
writeFileHandle.writeLong(0L);
getFileChannel().force(true);
}
@Override
int getVersion() {
return Serialization.VERSION_2;
}
}
static class RandomReader extends LogFile.RandomReader {
RandomReader(File file)
throws IOException {
super(file, null, true);
}
@Override
int getVersion() {
return Serialization.VERSION_2;
}
@Override
protected TransactionEventRecord doGet(RandomAccessFile fileHandle)
throws IOException {
return TransactionEventRecord.fromDataInputV2(fileHandle);
}
}
static class SequentialReader extends LogFile.SequentialReader {
SequentialReader(File file)
throws EOFException, IOException {
super(file, null);
RandomAccessFile fileHandle = getFileHandle();
int version = fileHandle.readInt();
if(version != getVersion()) {
throw new IOException("Version is " + Integer.toHexString(version) +
" expected " + Integer.toHexString(getVersion())
+ " file: " + file.getCanonicalPath());
}
setLogFileID(fileHandle.readInt());
setLastCheckpointPosition(fileHandle.readLong());
setLastCheckpointWriteOrderID(fileHandle.readLong());
}
@Override
public int getVersion() {
return Serialization.VERSION_2;
}
@Override
LogRecord doNext(int offset) throws IOException {
TransactionEventRecord event =
TransactionEventRecord.fromDataInputV2(getFileHandle());
return new LogRecord(getLogFileID(), offset, event);
}
}
}