org.apache.uima.collection.base_cpm

Interface BaseCPM

public interface BaseCPM

The Base CPM interface is a lower-level interface to the Collection Processing Manager. It is recommended that developers use the CollectionProcessingEngine and CpeDescription interfaces instead.

The CPM is configured with a list of CasProcessors by calling its addCasProcessor(CasProcessor) method. A single BaseCollectionReader must be provided, via the setCollectionReader(BaseCollectionReader) method. Collection processing is then initiated by calling the process() method.

Listeners can register with the CPM by calling the addStatusCallbackListener(BaseStatusCallbackListener) method. These listeners receive status callbacks during the processing. At any time, performance and progress reports are available from the getPerformanceReport() and getProgress() methods.

A CPM implementation may choose to implement parallelization of the processing, but this is not a requirement of the architecture.

Note that a CPM only supports processing one collection at a time. Attempting to reconfigure a CPM or start a new processing job while a previous processing job is occurring will result in a UIMA_IllegalStateException. Processing multiple collections simultaneously is done by instantiating and configuring multiple instances of the CPM.

Field Summary

Fields

Modifier and Type	Field and Description
static String	DOCUMENT_TEXT_FEATURE Only used for alternate CasData forms of the CAS (not used in this UIMA SDK release).
static String	DOCUMENT_TEXT_TYPE Only used for alternate CasData forms of the CAS (not used in this UIMA SDK release).

Method Summary

Modifier and Type	Method and Description
void	addCasProcessor(CasProcessor aCasProcessor) Adds a CasProcessor to this CPM's list of consumers.
void	addCasProcessor(CasProcessor aCasProcessor, int aIndex) Adds a CasProcessor to this CPM's list of consumers.
void	addStatusCallbackListener(BaseStatusCallbackListener aListener) Registers a listsner to receive status callbacks.
void	disableCasProcessor(String aCasProcessorName) Disables a CasProcessor in this CPM's list of CasProcessors.
CasProcessor[]	getCasProcessors() Gets the CasProcessorss assigned to this CPM, in the order in which they will be called by the CPM.
BaseCollectionReader	getCollectionReader() Gets the Collection Reader for this CPM.
ProcessTrace	getPerformanceReport() Gets a performance report for the processing that is currently occurring or has just completed.
Progress[]	getProgress() Gets a progress report for the processing that is currently occurring or has just completed.
boolean	isPaused() Determines whether this CPM's processing is currently paused.
boolean	isPauseOnException() Gets whether this CPM will automatically pause processing if an exception occurs.
boolean	isProcessing() Determines whether this CPM is currently processing.
boolean	isSerialProcessingRequired() Gets whether this CPM is required to process the collection's elements serially (as opposed to performing parallelization).
void	pause() Pauses processing.
void	process() Initiates processing of a collection.
void	removeCasProcessor(CasProcessor aCasProcessor) Removes a CasProcessor to this CPM's list of consumers.
void	removeStatusCallbackListener(BaseStatusCallbackListener aListener) Unregisters a status callback listener.
void	resume() Resumes processing that has been paused.
void	resume(boolean aRetryFailed) Resumes processing that has been paused.
void	setCollectionReader(BaseCollectionReader aCollectionReader) Sets the Collection Reader for this CPM.
void	setPauseOnException(boolean aPause) Sets whether this CPM will automatically pause processing if an exception occurs.
void	setSerialProcessingRequired(boolean aRequired) Sets whether this CPM is required to process the collection's elements serially (as opposed to performing parallelization).
void	stop() Stops processing.

Field Detail

DOCUMENT_TEXT_TYPE

static final String DOCUMENT_TEXT_TYPE

Only used for alternate CasData forms of the CAS (not used in this UIMA SDK release). Name of CasData CAS type that holds document text. When creating CasData forms of the CAS, a feature structure of this type must be created by the collection reader.

See Also:

Constant Field Values

DOCUMENT_TEXT_FEATURE

static final String DOCUMENT_TEXT_FEATURE

Only used for alternate CasData forms of the CAS (not used in this UIMA SDK release). Name of CAS feature (on DOCUMENT_TEXT_TYPE feature structure) that holds document text. When creating CasDta forms of the CAS, this feature must be set by the collection reader.

See Also:

Constant Field Values

Method Detail

getCollectionReader

BaseCollectionReader getCollectionReader()

Gets the Collection Reader for this CPM.

Returns:

the collection reader

setCollectionReader

void setCollectionReader(BaseCollectionReader aCollectionReader)

Sets the Collection Reader for this CPM.

Parameters:

aCollectionReader - the collection reader

getCasProcessors

CasProcessor[] getCasProcessors()

Gets the CasProcessorss assigned to this CPM, in the order in which they will be called by the CPM.

Returns:

an array of CasProcessors

addCasProcessor

void addCasProcessor(CasProcessor aCasProcessor)
              throws ResourceConfigurationException

Adds a CasProcessor to this CPM's list of consumers. The new CasProcessor will be added to the end of the list of CAS Processors.

Parameters:

aCasProcessor - a CasProcessor to add

Throws:

ResourceConfigurationException - if this CPM is currently processing

addCasProcessor

void addCasProcessor(CasProcessor aCasProcessor,
                     int aIndex)
              throws ResourceConfigurationException

Adds a CasProcessor to this CPM's list of consumers. The new CasProcessor will be added at the specified index.

Parameters:

aCasProcessor - the CasProcessor to add

aIndex - the index at which to add the CasProcessor

Throws:

ResourceConfigurationException - if this CPM is currently processing

removeCasProcessor

void removeCasProcessor(CasProcessor aCasProcessor)

Removes a CasProcessor to this CPM's list of consumers.

Parameters:

aCasProcessor - the CasProcessor to remove

disableCasProcessor

void disableCasProcessor(String aCasProcessorName)

Disables a CasProcessor in this CPM's list of CasProcessors.

Parameters:

aCasProcessorName - the name of the CasProcessor to disable

isSerialProcessingRequired

boolean isSerialProcessingRequired()

Gets whether this CPM is required to process the collection's elements serially (as opposed to performing parallelization). Note that a value of false does not guarantee that parallelization is performed; this is left up to the CPM implementation.

Returns:

true if and only if serial processing is required

setSerialProcessingRequired

void setSerialProcessingRequired(boolean aRequired)

Sets whether this CPM is required to process the collection's elements serially (as opposed to performing parallelization). If this method is not called, the default is false. Note that a value of false does not guarantee that parallelization is performed; this is left up to the CPM implementation.

Parameters:

aRequired - true if and only if serial processing is required

isPauseOnException

boolean isPauseOnException()

Gets whether this CPM will automatically pause processing if an exception occurs. If processing is paused it can be resumed by calling the resume(boolean) method.

Returns:

true if and only if this CPM will pause on exception

setPauseOnException

void setPauseOnException(boolean aPause)

Sets whether this CPM will automatically pause processing if an exception occurs. If processing is paused it can be resumed by calling the resume(boolean) method.

Parameters:

aPause - true if and only if this CPM should pause on exception

addStatusCallbackListener

void addStatusCallbackListener(BaseStatusCallbackListener aListener)

Registers a listsner to receive status callbacks.

Parameters:

aListener - the listener to add

removeStatusCallbackListener

void removeStatusCallbackListener(BaseStatusCallbackListener aListener)

Unregisters a status callback listener.

Parameters:

aListener - the listener to remove

process

void process()
      throws ResourceInitializationException

Initiates processing of a collection. This method starts the processing in another thread and returns immediately. Status of the processing can be obtained by registering a listener with the addStatusCallbackListener(BaseStatusCallbackListener) method.

A CPM can only process one collection at a time. If this method is called while a previous processing request has not yet completed, a UIMA_IllegalStateException will result. To find out whether a CPM is free to begin another processing request, call the isProcessing() method.

Throws:

ResourceInitializationException - if an error occurs during initialization

isProcessing

boolean isProcessing()

Determines whether this CPM is currently processing. This means that a processing request has been submitted and has not yet completed or been stop()ped. If processing is paused, this method will still return true.

Returns:

true if and only if this CPM is currently processing.

pause

void pause()

Pauses processing. Processing can later be resumed by calling the resume(boolean) method.

isPaused

boolean isPaused()

Determines whether this CPM's processing is currently paused.

Returns:

true if and only if this CPM's processing is currently paused.

resume

void resume(boolean aRetryFailed)

Resumes processing that has been paused.

Parameters:

aRetryFailed - if processing was paused because an exception occurred (see setPauseOnException(boolean)), setting a value of true for this parameter will cause the failed entity to be retried. A value of false (the default) will cause processing to continue with the next entity after the failure.

resume

void resume()

Resumes processing that has been paused.

stop

void stop()

Stops processing.

getPerformanceReport

ProcessTrace getPerformanceReport()

Gets a performance report for the processing that is currently occurring or has just completed.

Returns:

an object containing performance statistics

getProgress

Progress[] getProgress()

Gets a progress report for the processing that is currently occurring or has just completed.

Returns:

an array of Progress objects, each of which represents the progress in a different set of units (for example number of entities or bytes)