org.apache.lucene.monitor

## Class Monitor

- java.lang.Object
- - org.apache.lucene.monitor.Monitor

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public class Monitor
      extends Object
      implements Closeable

  A Monitor contains a set of `Query` objects with associated IDs, and efficiently matches them against sets of `Document` objects.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `Monitor.QueryCacheStats` Statistics for the query cache and query index

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Presearcher` | `presearcher`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Monitor(Analyzer analyzer)` Create a non-persistent Monitor instance with the default term-filtering Presearcher
    `Monitor(Analyzer analyzer, MonitorConfiguration config)` Create a new Monitor instance with a specific configuration
    `Monitor(Analyzer analyzer, Presearcher presearcher)` Create a new non-persistent Monitor instance
    `Monitor(Analyzer analyzer, Presearcher presearcher, MonitorConfiguration configuration)` Create a new Monitor instance

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addQueryIndexUpdateListener(MonitorUpdateListener listener)` Register a `MonitorUpdateListener` that will be notified whenever changes are made to the Monitor's queryindex
    `void` | `clear()` Delete all queries from the monitor
    `void` | `close()`
    `<T extends QueryMatch> PresearcherMatches<T>` | `debug(Document[] docs, MatcherFactory<T> factory)` Match a DocumentBatch against the queries stored in the Monitor, also returning information about which queries were selected by the presearcher, and why.
    `<T extends QueryMatch> PresearcherMatches<T>` | `debug(Document doc, MatcherFactory<T> factory)` Match a single `Document` against the queries stored in the Monitor, also returning information about which queries were selected by the presearcher, and why.
    `void` | `deleteById(List<String> queryIds)` Delete queries from the monitor by ID
    `void` | `deleteById(String... queryIds)` Delete queries from the monitor by ID
    `int` | `getDisjunctCount()`
    `MonitorQuery` | `getQuery(String queryId)` Get the MonitorQuery for a given query id
    `Monitor.QueryCacheStats` | `getQueryCacheStats()`
    `int` | `getQueryCount()`
    `Set<String>` | `getQueryIds()`
    `<T extends QueryMatch> MultiMatchingQueries<T>` | `match(Document[] docs, MatcherFactory<T> factory)` Match an array of `Document`s against the queryindex, calling a `CandidateMatcher` produced by the supplied `MatcherFactory` for each possible matching query.
    `<T extends QueryMatch> MatchingQueries<T>` | `match(Document doc, MatcherFactory<T> factory)` Match a single `Document` against the queryindex, calling a `CandidateMatcher` produced by the supplied `MatcherFactory` for each possible matching query.
    `void` | `purgeCache()` Remove unused queries from the query cache.
    `void` | `register(Iterable<MonitorQuery> queries)` Add new queries to the monitor
    `void` | `register(MonitorQuery... queries)` Add new queries to the monitor

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

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

- - ### Field Detail

    - #### presearcher

          protected final Presearcher presearcher

  - ### Constructor Detail

    - #### Monitor

          public Monitor(Analyzer analyzer)
                  throws IOException

      Create a non-persistent Monitor instance with the default term-filtering Presearcher
      Parameters:
        `analyzer` - to analyze `Document`s at match time
      Throws:
        `IOException`

    - #### Monitor

          public Monitor(Analyzer analyzer,
                         Presearcher presearcher)
                  throws IOException

      Create a new non-persistent Monitor instance
      Parameters:
        `analyzer` - to analyze `Document`s at match time
        `presearcher` - the presearcher to use
      Throws:
        `IOException`

    - #### Monitor

          public Monitor(Analyzer analyzer,
                         MonitorConfiguration config)
                  throws IOException

      Create a new Monitor instance with a specific configuration
      Parameters:
        `analyzer` - to analyze `Document`s at match time
        `config` - the configuration
      Throws:
        `IOException`

    - #### Monitor

          public Monitor(Analyzer analyzer,
                         Presearcher presearcher,
                         MonitorConfiguration configuration)
                  throws IOException

      Create a new Monitor instance
      Parameters:
        `analyzer` - to analyze `Document`s at match time
        `presearcher` - the presearcher to use
        `configuration` - the configuration
      Throws:
        `IOException`

  - ### Method Detail

    - #### addQueryIndexUpdateListener

          public void addQueryIndexUpdateListener(MonitorUpdateListener listener)

      Register a `MonitorUpdateListener` that will be notified whenever changes are made to the Monitor's queryindex
      Parameters:
        `listener` - listener to register

    - #### getQueryCacheStats

          public Monitor.QueryCacheStats getQueryCacheStats()

      Returns:
        Statistics for the internal query index and cache

    - #### purgeCache

          public void purgeCache()
                          throws IOException

      Remove unused queries from the query cache.

      This is normally called from a background thread at a rate set by configurePurgeFrequency().

      Throws:
        `IOException` - on IO errors

    - #### close

          public void close()
                     throws IOException

      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Throws:
        `IOException`

    - #### register

          public void register(Iterable<MonitorQuery> queries)
                        throws IOException

      Add new queries to the monitor
      Parameters:
        `queries` - the MonitorQueries to add
      Throws:
        `IOException`

    - #### register

          public void register(MonitorQuery... queries)
                        throws IOException

      Add new queries to the monitor
      Parameters:
        `queries` - the MonitorQueries to add
      Throws:
        `IOException` - on IO errors

    - #### deleteById

          public void deleteById(List<String> queryIds)
                          throws IOException

      Delete queries from the monitor by ID
      Parameters:
        `queryIds` - the IDs to delete
      Throws:
        `IOException` - on IO errors

    - #### deleteById

          public void deleteById(String... queryIds)
                          throws IOException

      Delete queries from the monitor by ID
      Parameters:
        `queryIds` - the IDs to delete
      Throws:
        `IOException` - on IO errors

    - #### clear

          public void clear()
                     throws IOException

      Delete all queries from the monitor
      Throws:
        `IOException` - on IO errors

    - #### match

          public <T extends QueryMatch> MultiMatchingQueries<T> match(Document[] docs,
                                                                      MatcherFactory<T> factory)
                                                               throws IOException

      Match an array of `Document`s against the queryindex, calling a `CandidateMatcher` produced by the supplied `MatcherFactory` for each possible matching query.
      Type Parameters:
        `T` - the type of `QueryMatch` to return
      Parameters:
        `docs` - the DocumentBatch to match
        `factory` - a `MatcherFactory` to use to create a `CandidateMatcher` for the match run
      Returns:
        a `MatchingQueries` object summarizing the match run.
      Throws:
        `IOException` - on IO errors

    - #### match

          public <T extends QueryMatch> MatchingQueries<T> match(Document doc,
                                                                 MatcherFactory<T> factory)
                                                          throws IOException

      Match a single `Document` against the queryindex, calling a `CandidateMatcher` produced by the supplied `MatcherFactory` for each possible matching query.
      Type Parameters:
        `T` - the type of `QueryMatch` to return
      Parameters:
        `doc` - the InputDocument to match
        `factory` - a `MatcherFactory` to use to create a `CandidateMatcher` for the match run
      Returns:
        a `MatchingQueries` object summarizing the match run.
      Throws:
        `IOException` - on IO errors

    - #### getQuery

          public MonitorQuery getQuery(String queryId)
                                throws IOException

      Get the MonitorQuery for a given query id
      Parameters:
        `queryId` - the id of the query to get
      Returns:
        the MonitorQuery stored for this id, or null if not found
      Throws:
        `IOException` - on IO errors
        `IllegalStateException` - if queries are not stored in the queryindex

    - #### getDisjunctCount

          public int getDisjunctCount()

      Returns:
        the number of queries (after decomposition) stored in this Monitor

    - #### getQueryCount

          public int getQueryCount()
                            throws IOException

      Returns:
        the number of queries stored in this Monitor
      Throws:
        `IOException` - on IO errors

    - #### getQueryIds

          public Set<String> getQueryIds()
                                  throws IOException

      Returns:
        the set of query ids of the queries stored in this Monitor
      Throws:
        `IOException` - on IO errors

    - #### debug

          public <T extends QueryMatch> PresearcherMatches<T> debug(Document[] docs,
                                                                    MatcherFactory<T> factory)
                                                             throws IOException

      Match a DocumentBatch against the queries stored in the Monitor, also returning information about which queries were selected by the presearcher, and why.
      Type Parameters:
        `T` - the type of QueryMatch produced by the CandidateMatcher
      Parameters:
        `docs` - a DocumentBatch to match against the index
        `factory` - a `MatcherFactory` to use to create a `CandidateMatcher` for the match run
      Returns:
        a `PresearcherMatches` object containing debug information
      Throws:
        `IOException` - on IO errors

    - #### debug

          public <T extends QueryMatch> PresearcherMatches<T> debug(Document doc,
                                                                    MatcherFactory<T> factory)
                                                             throws IOException

      Match a single `Document` against the queries stored in the Monitor, also returning information about which queries were selected by the presearcher, and why.
      Type Parameters:
        `T` - the type of QueryMatch produced by the CandidateMatcher
      Parameters:
        `doc` - an InputDocument to match against the index
        `factory` - a `MatcherFactory` to use to create a `CandidateMatcher` for the match run
      Returns:
        a `PresearcherMatches` object containing debug information
      Throws:
        `IOException` - on IO errors

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