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## 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 `CasProcessor`s 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
`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
`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 `CasProcessors`s assigned to this CPM, in the order in which they will be caleld 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 perfoming 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 perfoming 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 stucture 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 `CasProcessors`s assigned to this CPM, in the order in which they will be caleld by the CPM.

  Returns:
    an array of `CasProcessor`s

### 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:
    `UIMA_IllegalStateException` - if this CPM is currently processing
    `ResourceConfigurationException`

### 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:
    `UIMA_IllegalStateException` - if this CPM is currently processing
    `IndexOutOfBoundsException` - if aIndex is out of range
    `ResourceConfigurationException`

### removeCasProcessor

    void removeCasProcessor(CasProcessor aCasProcessor)

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

  Parameters:
    `aCasProcessor` - the `CasProcessor` to remove
  Throws:
    `UIMA_IllegalStateException` - if this CPM is currently processing

### disableCasProcessor

    void disableCasProcessor(String aCasProcessorName)

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

  Parameters:
    `aCasProcessorName` - the name of the `CasProcessor` to disable
  Throws:
    `UIMA_IllegalStateException` - if this CPM is currently processing
    `IOException` - if an I/O failure occurs

### isSerialProcessingRequired

    boolean isSerialProcessingRequired()

  Gets whether this CPM is required to process the collection's elements serially (as opposed to perfoming 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 perfoming 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
  Throws:
    `UIMA_IllegalStateException` - if this CPM is currently processing

### 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
  Throws:
    `UIMA_IllegalStateException` - if this CPM is currently processing

### 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
    `UIMA_IllegalStateException` - if this CPM is currently processing

### 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.

  Throws:
    `UIMA_IllegalStateException` - if no processing is currently occuring

### 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.
  Throws:
    `UIMA_IllegalStateException` - if processing is not currently paused

### resume

    void resume()

  Resumes processing that has been paused.

  Throws:
    `UIMA_IllegalStateException` - if processing is not currently paused

### stop

    void stop()

  Stops processing.

  Throws:
    `UIMA_IllegalStateException` - if no processing is currently occuring

### 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)

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