ReadTask (Lucene 3.6.2 API)
Keywords: org.apache.lucene.benchmark.byTask.tasks.ReadTask class

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## org.apache.lucene.benchmark.byTask.tasks
Class ReadTask

    java.lang.Object
      org.apache.lucene.benchmark.byTask.tasks.PerfTask
          org.apache.lucene.benchmark.byTask.tasks.ReadTask

All Implemented Interfaces:
  Cloneable

Direct Known Subclasses:
  SearchTask, SearchTravTask, SearchWithSortTask, WarmTask

    public abstract class ReadTask

extends PerfTask

Read index (abstract) task. Sub classes implement withSearch(), withWarm(), withTraverse() and withRetrieve() methods to configure the actual action.

Note: All ReadTasks reuse the reader if it is already open. Otherwise a reader is opened at start and closed at the end.

The `search.num.hits` config parameter sets the top number of hits to collect during searching. If `print.hits.field` is set, then each hit is printed along with the value of that field.

Other side effects: none.

Field Summary

Fields inherited from class org.apache.lucene.benchmark.byTask.tasks.PerfTask
`logStep, NEW_LINE, params, stopNow`

Constructor Summary
`ReadTask(PerfRunData runData)`

Method Summary
`protected org.apache.lucene.search.Collector` | `createCollector()`
`int` | `doLogic()` Perform the task once (ignoring repetitions specification) Return number of work items done by this task.
`protected BenchmarkHighlighter` | `getBenchmarkHighlighter(org.apache.lucene.search.Query q)` Return an appropriate highlighter to be used with highlighting tasks
`protected Collection<String>` | `getFieldsToHighlight(org.apache.lucene.document.Document document)` Define the fields to highlight.
`abstract QueryMaker` | `getQueryMaker()` Return query maker used for this task.
`protected org.apache.lucene.search.Sort` | `getSort()`
`int` | `numHits()` Specify the number of hits to retrieve.
`int` | `numToHighlight()` Set to the number of documents to highlight.
`protected org.apache.lucene.document.Document` | `retrieveDoc(org.apache.lucene.index.IndexReader ir, int id)`
`void` | `setup()` Task setup work that should not be measured for that specific task.
`int` | `traversalSize()` Specify the number of hits to traverse.
`boolean` | `withCollector()`
`boolean` | `withMaxScore()` Whether maxScores should be computed (only useful with field sort)
`abstract boolean` | `withRetrieve()` Return true if, with search & results traversing, docs should be retrieved.
`boolean` | `withScore()` Whether scores should be computed (only useful with field sort)
`abstract boolean` | `withSearch()` Return true if search should be performed.
`abstract boolean` | `withTraverse()` Return true if, with search, results should be traversed.
`abstract boolean` | `withWarm()` Return true if warming should be performed.

Methods inherited from class org.apache.lucene.benchmark.byTask.tasks.PerfTask
`clone, close, getBackgroundDeltaPriority, getDepth, getLogMessage, getName, getParams, getRunData, getRunInBackground, isDisableCounting, runAndMaybeStats, setDepth, setDisableCounting, setName, setParams, setRunInBackground, shouldNeverLogAtStart, shouldNotRecordStats, stopNow, supportsParams, tearDown, toString`

Methods inherited from class java.lang.Object
`equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### ReadTask

    public ReadTask(PerfRunData runData)

Method Detail

### 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`

### createCollector

    protected org.apache.lucene.search.Collector createCollector()
                                                          throws Exception

  Throws:
    `Exception`

### retrieveDoc

    protected org.apache.lucene.document.Document retrieveDoc(org.apache.lucene.index.IndexReader ir,
                                                              int id)
                                                       throws IOException

  Throws:
    `IOException`

### getQueryMaker

    public abstract QueryMaker getQueryMaker()

  Return query maker used for this task.

### withSearch

    public abstract boolean withSearch()

  Return true if search should be performed.

### withCollector

    public boolean withCollector()

### withWarm

    public abstract boolean withWarm()

  Return true if warming should be performed.

### withTraverse

    public abstract boolean withTraverse()

  Return true if, with search, results should be traversed.

### withScore

    public boolean withScore()

  Whether scores should be computed (only useful with field sort)

### withMaxScore

    public boolean withMaxScore()

  Whether maxScores should be computed (only useful with field sort)

### traversalSize

    public int traversalSize()

  Specify the number of hits to traverse. Tasks should override this if they want to restrict the number of hits that are traversed when `withTraverse()` is true. Must be greater than 0.

  Read task calculates the traversal as: Math.min(hits.length(), traversalSize())

  Returns:
    Integer.MAX_VALUE

### setup

    public void setup()
               throws Exception

  Description copied from class: `PerfTask`
  Task setup work that should not be measured for that specific task. By default it does nothing, but tasks can implement this, moving work from `PerfTask.doLogic()` to this method. Only the work done in `PerfTask.doLogic()` is measured for this task. Notice that higher level (sequence) tasks containing this task would then measure larger time than the sum of their contained tasks.

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

### numHits

    public int numHits()

  Specify the number of hits to retrieve. Tasks should override this if they want to restrict the number of hits that are collected during searching. Must be greater than 0.

  Returns:
    10 by default, or search.num.hits config if set.

### withRetrieve

    public abstract boolean withRetrieve()

  Return true if, with search & results traversing, docs should be retrieved.

### numToHighlight

    public int numToHighlight()

  Set to the number of documents to highlight.

  Returns:
    The number of the results to highlight. O means no docs will be highlighted.

### getBenchmarkHighlighter

    protected BenchmarkHighlighter getBenchmarkHighlighter(org.apache.lucene.search.Query q)

  Return an appropriate highlighter to be used with highlighting tasks

### getSort

    protected org.apache.lucene.search.Sort getSort()

### getFieldsToHighlight

    protected Collection<String> getFieldsToHighlight(org.apache.lucene.document.Document document)

  Define the fields to highlight. Base implementation returns all fields

  Parameters:
    `document` - The Document
  Returns:
    A Collection of Field names (Strings)

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