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

    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

    All Methods Instance Methods Abstract Methods
    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 `CasProcessors`s 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 `CasProcessors`s assigned to this CPM, in the order in which they will be called 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:
        `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)

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