org.dspace.checker

Class CheckerCommand

java.lang.Object

org.dspace.checker.CheckerCommand

public final class CheckerCommand
extends Object

Main class for the checksum checker tool, which calculates checksums for each bitstream whose ID is in the most_recent_checksum table, and compares it against the last calculated checksum for that bitstream.

Author:

Jim Downing, Grace Carpenter, Nathan Sarr TODO the accessor methods are currently unused - are they useful? TODO check for any existing resource problems

Constructor Summary

Constructors

Constructor and Description
CheckerCommand(Context context) Default constructor uses DSpace plugin manager to construct dependencies.

Method Summary

Modifier and Type	Method and Description
protected MostRecentChecksum	checkBitstream(Bitstream bitstream) Check a specified bitstream.
protected ChecksumResult	compareChecksums(String checksumA, String checksumB) Compares two checksums.
protected ChecksumResult	getChecksumResultByCode(ChecksumResultCode checksumResultCode)
ChecksumResultsCollector	getCollector() Get the collector that holds/logs the results for this process run.
BitstreamDispatcher	getDispatcher() Get dispatcher being used by this run of the checker.
Date	getProcessStartDate() Get time at which checker process began.
boolean	isReportVerbose() Determine if any errors are reported
void	process() Uses the options set up on this checker to determine a mode of execution, and then accepts bitstream ids from the dispatcher and checks their bitstreams against the db records.
protected void	processBitstream(MostRecentChecksum info) Process general case bitstream.
protected void	processDeletedBitstream(MostRecentChecksum info) Process bitstream that was marked 'deleted' in bitstream table.
protected void	processNullInfoBitstream(MostRecentChecksum info) Process bitstream whose ID was not found in most_recent_checksum or bitstream table.
void	setCollector(ChecksumResultsCollector collector) Set the collector that holds/logs the results for this process run.
void	setDispatcher(BitstreamDispatcher dispatcher) Set the dispatcher to be used by this run of the checker.
void	setProcessStartDate(Date startDate) Set time at which checker process began.
void	setReportVerbose(boolean reportVerbose) Set report errors only

Methods inherited from class java.lang.Object

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

Constructor Detail

CheckerCommand

public CheckerCommand(Context context)

Default constructor uses DSpace plugin manager to construct dependencies.

Parameters:

context - Context

Method Detail

process

public void process()
             throws SQLException

Uses the options set up on this checker to determine a mode of execution, and then accepts bitstream ids from the dispatcher and checks their bitstreams against the db records.

N.B. a valid BitstreamDispatcher must be provided using setBitstreamDispatcher before calling this method

Throws:

SQLException - if database error

checkBitstream

protected MostRecentChecksum checkBitstream(Bitstream bitstream)
                                     throws SQLException

Check a specified bitstream.

Parameters:

bitstream - the bitstream

Returns:

the information about the bitstream and its checksum data

Throws:

SQLException - if database error

compareChecksums

protected ChecksumResult compareChecksums(String checksumA,
                                          String checksumB)
                                   throws SQLException

Compares two checksums.

Parameters:

checksumA - the first checksum

checksumB - the second checksum

Returns:

a result code (constants defined in Util)

Throws:

SQLException - if database error

processDeletedBitstream

protected void processDeletedBitstream(MostRecentChecksum info)
                                throws SQLException

Process bitstream that was marked 'deleted' in bitstream table. A deleted bitstream should only be checked once afterwards it should be marked 'to_be_processed=false'. Note that to_be_processed must be manually updated in db to allow for future processing.

Parameters:

info - a deleted bitstream.

Throws:

SQLException - if database error

processNullInfoBitstream

protected void processNullInfoBitstream(MostRecentChecksum info)
                                 throws SQLException

Process bitstream whose ID was not found in most_recent_checksum or bitstream table. No updates can be done. The missing bitstream is output to the log file.

Parameters:

info - A not found BitStreamInfo TODO is this method required?

Throws:

SQLException - if database error

processBitstream

protected void processBitstream(MostRecentChecksum info)
                         throws SQLException

Process general case bitstream.

Note: bitstream will have timestamp indicating it was "checked", even if actual checksumming never took place.

TODO Why does bitstream have a timestamp indicating it's checked if checksumming doesn't occur?

Parameters:

info - BitstreamInfo to handle

Throws:

SQLException - if database error

getChecksumResultByCode

protected ChecksumResult getChecksumResultByCode(ChecksumResultCode checksumResultCode)
                                          throws SQLException

Throws:

SQLException

getDispatcher

public BitstreamDispatcher getDispatcher()

Get dispatcher being used by this run of the checker.

Returns:

the dispatcher being used by this run.

setDispatcher

public void setDispatcher(BitstreamDispatcher dispatcher)

Set the dispatcher to be used by this run of the checker.

Parameters:

dispatcher - Dispatcher to use.

getCollector

public ChecksumResultsCollector getCollector()

Get the collector that holds/logs the results for this process run.

Returns:

The ChecksumResultsCollector being used.

setCollector

public void setCollector(ChecksumResultsCollector collector)

Set the collector that holds/logs the results for this process run.

Parameters:

collector - the collector to be used for this run

getProcessStartDate

public Date getProcessStartDate()

Get time at which checker process began.

Returns:

start time

setProcessStartDate

public void setProcessStartDate(Date startDate)

Set time at which checker process began.

Parameters:

startDate - start time

isReportVerbose

public boolean isReportVerbose()

Determine if any errors are reported

Returns:

true if only errors reported

setReportVerbose

public void setReportVerbose(boolean reportVerbose)

Set report errors only

Parameters:

reportVerbose - true to report only errors in the logs.