Collaboration diagram for com.vertica.sdk.FileManager:

Public Member Functions
abstract void	closeReader (long readerID) throws UdfException, DestroyInvocation

abstract void	closeWriter (long writerID) throws UdfException, DestroyInvocation

abstract int	deleteIt (String fileName, boolean isRecursively) throws UdfException, DestroyInvocation

abstract void	finalize ()

abstract boolean	initDFSFile (DFSFile file) throws UdfException, DestroyInvocation

abstract List< DFSFile >	listFiles (String fileName) throws UdfException, DestroyInvocation

abstract long	openForRead (String fileName, DFSFile.DFSRootParentType parentType, String parentName) throws UdfException, DestroyInvocation

abstract long	openForWrite (String fileName, DFSFile.DFSScope dfsScope, DFSFile.DFSDistribution dfsDistrib) throws UdfException, DestroyInvocation

abstract int	read (long readerID, ByteBuffer buffer, int size) throws UdfException, DestroyInvocation

abstract long	seek (long readerID, long offset, int origin) throws UdfException, DestroyInvocation

abstract int	write (long writerID, ByteBuffer buffer) throws UdfException, DestroyInvocation

Detailed Description

File Manager is a session level co-ordinator, which will be used by DFSFile, DFSFileReader and DFSFileWriter to interact with Catalog and Storage system of Vertica.

Member Function Documentation

abstract void com.vertica.sdk.FileManager.closeReader ( long readerID ) throws UdfException, DestroyInvocation

pure virtual

Closes the file opened for reading, identified by 'readerID'

Parameters

readerID id of the reader to close

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract void com.vertica.sdk.FileManager.closeWriter ( long writerID ) throws UdfException, DestroyInvocation

pure virtual

Closes the file opened for writing, identified by 'writerID'

Parameters

writerID id of the writer to close

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract int com.vertica.sdk.FileManager.deleteIt	(	String	fileName,
		boolean	isRecursively
	)		throws UdfException, DestroyInvocation

pure virtual

Deletes a DFSFile, identified by full path 'fileName'.

Parameters

fileName	the file or directory to delete
isRecursively	whether to delete recursively

Returns: 0 if successful, throw exceptions if there are errors

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract void com.vertica.sdk.FileManager.finalize ( )

pure virtual

Finalizes a plan/query/statement. Should only invoke on the initiator node of a query. Complete file replication and commit metadata into the catalog. returns nothing, throws exceptions if there are errors.

abstract boolean com.vertica.sdk.FileManager.initDFSFile ( DFSFile file ) throws UdfException, DestroyInvocation

pure virtual

Initialize a DFSFile upon constructing.

Parameters

file	the DFS file to initialize

Returns: true if file exists in the DFS, false otherwise

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract List<DFSFile> com.vertica.sdk.FileManager.listFiles ( String fileName ) throws UdfException, DestroyInvocation

pure virtual

Lists file under the path specified by 'fileName'

Parameters

fileName name of file/directory to list

Returns: a list of DFSFile found under the path.

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract long com.vertica.sdk.FileManager.openForRead	(	String	fileName,
		DFSFile.DFSRootParentType	parentType,
		String	parentName
	)		throws UdfException, DestroyInvocation

pure virtual

Opens a file for reading

Parameters

fileName	the filename
parentType	type of the parent
parentName	name of the parent

Returns: A unique identifier for the file opened. Return value is less than 0 if there are errors

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract long com.vertica.sdk.FileManager.openForWrite	(	String	fileName,
		DFSFile.DFSScope	dfsScope,
		DFSFile.DFSDistribution	dfsDistrib
	)		throws UdfException, DestroyInvocation

pure virtual

Opens a file for writing

Parameters

fileName	name of file
dfsScope	scope
dfsDistrib	distribution

Returns: A unique identifier for the file opened. Return value is less tan 0 if there are errors

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract int com.vertica.sdk.FileManager.read	(	long	readerID,
		ByteBuffer	buffer,
		int	size
	)		throws UdfException, DestroyInvocation

pure virtual

Reads 'size' of bytes into buffer from the file identified by 'readerID'.

Parameters

readerID	id of the file reader
buffer	ByteBuffer to read into
size	number of bytes to read

Returns: number of bytes actually read, 0 if no bytes were read, indicates the EOF.

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract long com.vertica.sdk.FileManager.seek	(	long	readerID,
		long	offset,
		int	origin
	)		throws UdfException, DestroyInvocation

pure virtual

Reposition the read file offset

Parameters

readerID	id of the file reader
offset	offset to seek to
origin	origin from which to seek

Returns: the new file offset.

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

abstract int com.vertica.sdk.FileManager.write	(	long	writerID,
		ByteBuffer	buffer
	)		throws UdfException, DestroyInvocation

pure virtual

Writes bytes into the file identified by 'writerID' from the buffer.

Bytes are retrieved from buffer starting from the current position till it's limit. Current position will be advanced depending on how many bytes are written.

Parameters

writerID	id of the writer
buffer	ByteBuffer from which to write

Returns: number of bytes actually written, less than 0 if there are any errors.

Exceptions

UdfException	UDF problem
DestroyInvocation	vertica canceling – do not catch or handle

Public Member Functions

Detailed Description

Member Function Documentation