co.codewizards.cloudstore.local.transport

Class TempChunkFileManager

java.lang.Object

co.codewizards.cloudstore.local.transport.TempChunkFileManager

public class TempChunkFileManager
extends Object

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TempChunkFileManager()

Method Summary

Modifier and Type	Method and Description
File	createTempChunkFile(File destFile, long offset) Create the temporary file for the given destFile and offset.
protected File	createTempChunkFile(File destFile, long offset, boolean createNewFile)
TempChunkFileDto	createTempChunkFileDto(long offset, File tempChunkFile, String sha1)
protected void	deleteOrFail(File file)
void	deleteTempChunkFiles(Collection<TempChunkFileWithDtoFile> tempChunkFileWithDtoFiles)
void	deleteTempChunkFilesWithoutDtoFile(Collection<TempChunkFileWithDtoFile> tempChunkFileWithDtoFiles)
void	deleteTempDirIfEmpty(File destFile) Deletes the temporary directory for the given destFile, if this directory is empty.
static TempChunkFileManager	getInstance()
Map<Long,TempChunkFileWithDtoFile>	getOffset2TempChunkFileWithDtoFile(File destFile)
File	getTempChunkFileDtoFile(File tempChunkFile)
File	getTempDir(File destFile)
void	moveChunks(File oldDestFile, File newDestFile) If source file was moved, the chunks need to be moved, too.
protected void	moveOrFail(File oldFile, File newFile)
void	writeFileDataToTempChunkFile(File destFile, long offset, byte[] fileData)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TempChunkFileManager

protected TempChunkFileManager()

Method Detail

getInstance

public static TempChunkFileManager getInstance()

writeFileDataToTempChunkFile

public void writeFileDataToTempChunkFile(File destFile,
                                         long offset,
                                         byte[] fileData)

deleteOrFail

protected void deleteOrFail(File file)
                     throws IOException

Throws:

IOException

deleteTempChunkFilesWithoutDtoFile

public void deleteTempChunkFilesWithoutDtoFile(Collection<TempChunkFileWithDtoFile> tempChunkFileWithDtoFiles)

getOffset2TempChunkFileWithDtoFile

public Map<Long,TempChunkFileWithDtoFile> getOffset2TempChunkFileWithDtoFile(File destFile)

getTempChunkFileDtoFile

public File getTempChunkFileDtoFile(File tempChunkFile)

createTempChunkFile

public File createTempChunkFile(File destFile,
                                long offset)

Create the temporary file for the given destFile and offset.

The returned file is created, if it does not yet exist; but it is not overwritten, if it already exists.

The temporary directory in which the temporary file is located is created, if necessary. In order to prevent collisions with code trying to delete the empty temporary directory, this method and the corresponding deleteTempDirIfEmpty(File) are both synchronized.

Parameters:

destFile - the destination file for which to resolve and create the temporary file. Must not be null.

offset - the offset (inside the final destination file and the source file) of the block to be temporarily stored in the temporary file created by this method. The temporary file will hold solely this block (thus the offset in the temporary file is 0).

Returns:

the temporary file. Never null. The file is already created in the file system (empty), if it did not yet exist.

createTempChunkFile

protected File createTempChunkFile(File destFile,
                                   long offset,
                                   boolean createNewFile)

moveChunks

public void moveChunks(File oldDestFile,
                       File newDestFile)

If source file was moved, the chunks need to be moved, too.

moveOrFail

protected void moveOrFail(File oldFile,
                          File newFile)
                   throws IOException

Throws:

IOException

deleteTempDirIfEmpty

public void deleteTempDirIfEmpty(File destFile)

Deletes the temporary directory for the given destFile, if this directory is empty.

This method is synchronized to prevent it from colliding with createTempChunkFile(File, long) which first creates the temporary directory and then the file in it. Without synchronisation, the newly created directory might be deleted by this method, before the temporary file in it is created.

Parameters:

destFile - the destination file for which to resolve and delete the temporary directory. Must not be null.

getTempDir

public File getTempDir(File destFile)

createTempChunkFileDto

public TempChunkFileDto createTempChunkFileDto(long offset,
                                               File tempChunkFile,
                                               String sha1)

Parameters:

offset - the offset in the (real) destination file (not in tempChunkFile! there the offset is always 0).

tempChunkFile - the tempChunkFile containing the chunk's data. Must not be null.

sha1 - the sha1 of the single chunk (in tempChunkFile). Must not be null.

Returns:

the Dto. Never null.

deleteTempChunkFiles

public void deleteTempChunkFiles(Collection<TempChunkFileWithDtoFile> tempChunkFileWithDtoFiles)