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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.io.util;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.*;
import java.text.DecimalFormat;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.cassandra.config.Config;
import sun.nio.ch.DirectBuffer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.concurrent.ScheduledExecutors;
import org.apache.cassandra.io.FSError;
import org.apache.cassandra.io.FSErrorHandler;
import org.apache.cassandra.io.FSReadError;
import org.apache.cassandra.io.FSWriteError;
import org.apache.cassandra.io.sstable.CorruptSSTableException;
import org.apache.cassandra.utils.JVMStabilityInspector;
import static org.apache.cassandra.utils.Throwables.maybeFail;
import static org.apache.cassandra.utils.Throwables.merge;
public final class FileUtils
{
private static final Logger logger = LoggerFactory.getLogger(FileUtils.class);
private static final double KB = 1024d;
private static final double MB = 1024*1024d;
private static final double GB = 1024*1024*1024d;
private static final double TB = 1024*1024*1024*1024d;
private static final DecimalFormat df = new DecimalFormat("#.##");
private static final boolean canCleanDirectBuffers;
private static final AtomicReference fsErrorHandler = new AtomicReference<>();
static
{
boolean canClean = false;
try
{
ByteBuffer buf = ByteBuffer.allocateDirect(1);
((DirectBuffer) buf).cleaner().clean();
canClean = true;
}
catch (Throwable t)
{
JVMStabilityInspector.inspectThrowable(t);
logger.info("Cannot initialize un-mmaper. (Are you using a non-Oracle JVM?) Compacted data files will not be removed promptly. Consider using an Oracle JVM or using standard disk access mode");
}
canCleanDirectBuffers = canClean;
}
public static void createHardLink(String from, String to)
{
createHardLink(new File(from), new File(to));
}
public static void createHardLink(File from, File to)
{
if (to.exists())
throw new RuntimeException("Tried to create duplicate hard link to " + to);
if (!from.exists())
throw new RuntimeException("Tried to hard link to file that does not exist " + from);
try
{
Files.createLink(to.toPath(), from.toPath());
}
catch (IOException e)
{
throw new FSWriteError(e, to);
}
}
public static File createTempFile(String prefix, String suffix, File directory)
{
try
{
return File.createTempFile(prefix, suffix, directory);
}
catch (IOException e)
{
throw new FSWriteError(e, directory);
}
}
public static File createTempFile(String prefix, String suffix)
{
return createTempFile(prefix, suffix, new File(System.getProperty("java.io.tmpdir")));
}
public static Throwable deleteWithConfirm(String filePath, boolean expect, Throwable accumulate)
{
return deleteWithConfirm(new File(filePath), expect, accumulate);
}
public static Throwable deleteWithConfirm(File file, boolean expect, Throwable accumulate)
{
boolean exists = file.exists();
assert exists || !expect : "attempted to delete non-existing file " + file.getName();
try
{
if (exists)
Files.delete(file.toPath());
}
catch (Throwable t)
{
try
{
throw new FSWriteError(t, file);
}
catch (Throwable t2)
{
accumulate = merge(accumulate, t2);
}
}
return accumulate;
}
public static void deleteWithConfirm(String file)
{
deleteWithConfirm(new File(file));
}
public static void deleteWithConfirm(File file)
{
maybeFail(deleteWithConfirm(file, true, null));
}
public static void renameWithOutConfirm(String from, String to)
{
try
{
atomicMoveWithFallback(new File(from).toPath(), new File(to).toPath());
}
catch (IOException e)
{
if (logger.isTraceEnabled())
logger.trace("Could not move file "+from+" to "+to, e);
}
}
public static void renameWithConfirm(String from, String to)
{
renameWithConfirm(new File(from), new File(to));
}
public static void renameWithConfirm(File from, File to)
{
assert from.exists() : from + " should exist";
if (logger.isTraceEnabled())
logger.trace((String.format("Renaming %s to %s", from.getPath(), to.getPath())));
// this is not FSWE because usually when we see it it's because we didn't close the file before renaming it,
// and Windows is picky about that.
try
{
atomicMoveWithFallback(from.toPath(), to.toPath());
}
catch (IOException e)
{
throw new RuntimeException(String.format("Failed to rename %s to %s", from.getPath(), to.getPath()), e);
}
}
/**
* Move a file atomically, if it fails, it falls back to a non-atomic operation
* @param from
* @param to
* @throws IOException
*/
private static void atomicMoveWithFallback(Path from, Path to) throws IOException
{
try
{
Files.move(from, to, StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE);
}
catch (AtomicMoveNotSupportedException e)
{
logger.trace("Could not do an atomic move", e);
Files.move(from, to, StandardCopyOption.REPLACE_EXISTING);
}
}
public static void truncate(String path, long size)
{
try(FileChannel channel = FileChannel.open(Paths.get(path), StandardOpenOption.READ, StandardOpenOption.WRITE))
{
channel.truncate(size);
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
public static void closeQuietly(Closeable c)
{
try
{
if (c != null)
c.close();
}
catch (Exception e)
{
logger.warn("Failed closing {}", c, e);
}
}
public static void close(Closeable... cs) throws IOException
{
close(Arrays.asList(cs));
}
public static void close(Iterable cs) throws IOException
{
IOException e = null;
for (Closeable c : cs)
{
try
{
if (c != null)
c.close();
}
catch (IOException ex)
{
e = ex;
logger.warn("Failed closing stream {}", c, ex);
}
}
if (e != null)
throw e;
}
public static String getCanonicalPath(String filename)
{
try
{
return new File(filename).getCanonicalPath();
}
catch (IOException e)
{
throw new FSReadError(e, filename);
}
}
public static String getCanonicalPath(File file)
{
try
{
return file.getCanonicalPath();
}
catch (IOException e)
{
throw new FSReadError(e, file);
}
}
public static boolean isCleanerAvailable()
{
return canCleanDirectBuffers;
}
public static void clean(ByteBuffer buffer)
{
if (isCleanerAvailable() && buffer.isDirect())
((DirectBuffer)buffer).cleaner().clean();
}
public static void createDirectory(String directory)
{
createDirectory(new File(directory));
}
public static void createDirectory(File directory)
{
if (!directory.exists())
{
if (!directory.mkdirs())
throw new FSWriteError(new IOException("Failed to mkdirs " + directory), directory);
}
}
public static boolean delete(String file)
{
File f = new File(file);
return f.delete();
}
public static void delete(File... files)
{
for ( File file : files )
{
file.delete();
}
}
public static void deleteAsync(final String file)
{
Runnable runnable = new Runnable()
{
public void run()
{
deleteWithConfirm(new File(file));
}
};
ScheduledExecutors.nonPeriodicTasks.execute(runnable);
}
public static String stringifyFileSize(double value)
{
double d;
if ( value >= TB )
{
d = value / TB;
String val = df.format(d);
return val + " TB";
}
else if ( value >= GB )
{
d = value / GB;
String val = df.format(d);
return val + " GB";
}
else if ( value >= MB )
{
d = value / MB;
String val = df.format(d);
return val + " MB";
}
else if ( value >= KB )
{
d = value / KB;
String val = df.format(d);
return val + " KB";
}
else
{
String val = df.format(value);
return val + " bytes";
}
}
/**
* Deletes all files and subdirectories under "dir".
* @param dir Directory to be deleted
* @throws FSWriteError if any part of the tree cannot be deleted
*/
public static void deleteRecursive(File dir)
{
if (dir.isDirectory())
{
String[] children = dir.list();
for (String child : children)
deleteRecursive(new File(dir, child));
}
// The directory is now empty so now it can be smoked
deleteWithConfirm(dir);
}
/**
* Schedules deletion of all file and subdirectories under "dir" on JVM shutdown.
* @param dir Directory to be deleted
*/
public static void deleteRecursiveOnExit(File dir)
{
if (dir.isDirectory())
{
String[] children = dir.list();
for (String child : children)
deleteRecursiveOnExit(new File(dir, child));
}
logger.trace("Scheduling deferred deletion of file: " + dir);
dir.deleteOnExit();
}
public static void skipBytesFully(DataInput in, int bytes) throws IOException
{
int n = 0;
while (n < bytes)
{
int skipped = in.skipBytes(bytes - n);
if (skipped == 0)
throw new EOFException("EOF after " + n + " bytes out of " + bytes);
n += skipped;
}
}
public static void handleCorruptSSTable(CorruptSSTableException e)
{
FSErrorHandler handler = fsErrorHandler.get();
if (handler != null)
handler.handleCorruptSSTable(e);
}
public static void handleFSError(FSError e)
{
FSErrorHandler handler = fsErrorHandler.get();
if (handler != null)
handler.handleFSError(e);
}
/**
* Get the size of a directory in bytes
* @param directory The directory for which we need size.
* @return The size of the directory
*/
public static long folderSize(File directory)
{
long length = 0;
for (File file : directory.listFiles())
{
if (file.isFile())
length += file.length();
else
length += folderSize(file);
}
return length;
}
public static void copyTo(DataInput in, OutputStream out, int length) throws IOException
{
byte[] buffer = new byte[64 * 1024];
int copiedBytes = 0;
while (copiedBytes + buffer.length < length)
{
in.readFully(buffer);
out.write(buffer);
copiedBytes += buffer.length;
}
if (copiedBytes < length)
{
int left = length - copiedBytes;
in.readFully(buffer, 0, left);
out.write(buffer, 0, left);
}
}
public static boolean isSubDirectory(File parent, File child) throws IOException
{
parent = parent.getCanonicalFile();
child = child.getCanonicalFile();
File toCheck = child;
while (toCheck != null)
{
if (parent.equals(toCheck))
return true;
toCheck = toCheck.getParentFile();
}
return false;
}
public static void setFSErrorHandler(FSErrorHandler handler)
{
fsErrorHandler.getAndSet(handler);
}
}