org.apache.lucene.benchmark.byTask.tasks

## Class WriteLineDocTask

- java.lang.Object
- - org.apache.lucene.benchmark.byTask.tasks.PerfTask
  - - org.apache.lucene.benchmark.byTask.tasks.WriteLineDocTask

- All Implemented Interfaces:
    Cloneable
  Direct Known Subclasses:
    WriteEnwikiLineDocTask

      public class WriteLineDocTask
      extends PerfTask

  A task which writes documents, one line per document. Each line is in the following format: title <TAB> date <TAB> body. The output of this task can be consumed by `LineDocSource` and is intended to save the IO overhead of opening a file per document to be indexed.

  The format of the output is set according to the output file extension. Compression is recommended when the output file is expected to be large. See info on file extensions in `StreamUtils.Type`

  Supports the following parameters:

  - line.file.out - the name of the file to write the output to. That parameter is mandatory. NOTE: the file is re-created.
  - line.fields - which fields should be written in each line. (optional, default: `DEFAULT_FIELDS`).
  - sufficient.fields - list of field names, separated by comma, which, if all of them are missing, the document will be skipped. For example, to require that at least one of f1,f2 is not empty, specify: "f1,f2" in this field. To specify that no field is required, i.e. that even empty docs should be emitted, specify ",". (optional, default: `DEFAULT_SUFFICIENT_FIELDS`).
  NOTE: this class is not thread-safe and if used by multiple threads the output is unspecified (as all will write to the same output file in a non-synchronized way).

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String[]` | `DEFAULT_FIELDS` Fields to be written by default
    `static String` | `DEFAULT_SUFFICIENT_FIELDS` Default fields which at least one of them is required to not skip the doc.
    `static String` | `FIELDS_HEADER_INDICATOR`
    `protected String` | `fname`
    `static char` | `SEP`

    - ### Fields inherited from class org.apache.lucene.benchmark.byTask.tasks.PerfTask

      `logStep, NEW_LINE, params, stopNow`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `WriteLineDocTask(PerfRunData runData)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()`
    `int` | `doLogic()` Perform the task once (ignoring repetitions specification) Return number of work items done by this task.
    `protected String` | `getLogMessage(int recsCount)`
    `protected PrintWriter` | `lineFileOut(Document doc)` Selects output line file by written doc.
    `void` | `setParams(String params)` Set the params (docSize only)
    `boolean` | `supportsParams()` Sub classes that support parameters must override this method to return true.
    `protected void` | `writeHeader(PrintWriter out)` Write header to the lines file - indicating how to read the file later.

    - ### Methods inherited from class org.apache.lucene.benchmark.byTask.tasks.PerfTask

      `clone, getAlgLineNum, getBackgroundDeltaPriority, getDepth, getName, getParams, getRunData, getRunInBackground, isDisableCounting, runAndMaybeStats, setAlgLineNum, setDepth, setDisableCounting, setName, setRunInBackground, setup, shouldNeverLogAtStart, shouldNotRecordStats, stopNow, tearDown, toString`

    - ### Methods inherited from class java.lang.Object

      `equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### FIELDS_HEADER_INDICATOR

          public static final String FIELDS_HEADER_INDICATOR

      See Also:
        Constant Field Values

    - #### SEP

          public static final char SEP

      See Also:
        Constant Field Values

    - #### DEFAULT_FIELDS

          public static final String[] DEFAULT_FIELDS

      Fields to be written by default

    - #### DEFAULT_SUFFICIENT_FIELDS

          public static final String DEFAULT_SUFFICIENT_FIELDS

      Default fields which at least one of them is required to not skip the doc.
      See Also:
        Constant Field Values

    - #### fname

          protected final String fname

  - ### Constructor Detail

    - #### WriteLineDocTask

          public WriteLineDocTask(PerfRunData runData)
                           throws Exception

      Throws:
        `Exception`

  - ### Method Detail

    - #### writeHeader

          protected void writeHeader(PrintWriter out)

      Write header to the lines file - indicating how to read the file later.

    - #### getLogMessage

          protected String getLogMessage(int recsCount)

      Overrides:
        `getLogMessage` in class `PerfTask`

    - #### doLogic

          public int doLogic()
                      throws Exception

      Description copied from class: `PerfTask`
      Perform the task once (ignoring repetitions specification) Return number of work items done by this task. For indexing that can be number of docs added. For warming that can be number of scanned items, etc.
      Specified by:
        `doLogic` in class `PerfTask`
      Returns:
        number of work items done by this task.
      Throws:
        `Exception`

    - #### lineFileOut

          protected PrintWriter lineFileOut(Document doc)

      Selects output line file by written doc. Default: original output line file.

    - #### close

          public void close()
                     throws Exception

      Overrides:
        `close` in class `PerfTask`
      Throws:
        `Exception`

    - #### setParams

          public void setParams(String params)

      Set the params (docSize only)
      Overrides:
        `setParams` in class `PerfTask`
      Parameters:
        `params` - docSize, or 0 for no limit.

    - #### supportsParams

          public boolean supportsParams()

      Description copied from class: `PerfTask`
      Sub classes that support parameters must override this method to return true.
      Overrides:
        `supportsParams` in class `PerfTask`
      Returns:
        true iff this task supports command line params.

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