Package com.yahoo.search.searchchain.testutil

Class DocumentSourceSearcher

  • All Implemented Interfaces:
    com.yahoo.component.Component, java.lang.Comparable<com.yahoo.component.Component>
    public class DocumentSourceSearcher
extends Searcher

    Implements a document source. You pass in a query and a Result set. When this Searcher is called with that query it will return that result set.

    This supports multi-phase search.

    To avoid having to add type information for the fields, a quck hack is used to support testing of attribute prefetching. Any field in the configured hits which has a name starting by attribute will be returned when attribute prefetch filling is requested.

    Author:
    bratseth

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String DEFAULT_SUMMARY_CLASS  

      • Fields inherited from class com.yahoo.component.AbstractComponent

        isDeconstructable

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean addResult​(Query query, Result fullResult)
      Adds a result which can be searched for and filled.
      void addSummaryClass​(java.lang.String name, java.util.Set<java.lang.String> fields)  
      void addSummaryClassByCopy​(java.lang.String name, java.util.Collection<java.lang.String> fields)  
      void fill​(Result result, java.lang.String summaryClass, Execution execution)
      Fill hit properties with data using the given summary class.
      int getQueryCount()
      Returns the number of queries made to this searcher since the last reset.
      void resetQueryCount()  
      Result search​(Query query, Execution execution)
      Override this to implement your searcher.

      • Methods inherited from class com.yahoo.component.chain.ChainedComponent

        getAnnotatedDependencies, getDefaultAnnotatedDependencies, getDependencies, initDependencies

      • Methods inherited from class com.yahoo.component.AbstractComponent

        clone, compareTo, deconstruct, getClassName, getId, getIdString, hasInitializedId, initId, isDeconstructable, setIsDeconstructable

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • DEFAULT_SUMMARY_CLASS

        public static final java.lang.String DEFAULT_SUMMARY_CLASS
        See Also:
        Constant Field Values

    • Constructor Detail

      • DocumentSourceSearcher

        public DocumentSourceSearcher()

    • Method Detail

      • addResult

        public boolean addResult​(Query query,
                         Result fullResult)
        Adds a result which can be searched for and filled. Summary fields starting by "a" are attributes, others are not.
        Returns:
        true when replacing an existing <query, result> pair.

      • addSummaryClass

        public void addSummaryClass​(java.lang.String name,
                            java.util.Set<java.lang.String> fields)

      • addSummaryClassByCopy

        public void addSummaryClassByCopy​(java.lang.String name,
                                  java.util.Collection<java.lang.String> fields)

      • search

        public Result search​(Query query,
                     Execution execution)
        Description copied from class: Searcher
        Override this to implement your searcher.

        Searcher implementation subclasses will, depending on their type of logic, do one of the following:

        • Query processors: Access the query, then call execution.search and return the result
        • Result processors: Call execution.search to get the result, access it and return
        • Sources (which produces results): Create a result, add the desired hits and return it.
        • Federators (which forwards the search to multiple subchains): Call search on the desired subchains in parallel and get the results. Combine the results to one and return it.
        • Workflows: Call execution.search as many times as desired, using different queries. Eventually return a result.

        Hits come in two kinds - concrete hits are actual content of the kind requested by the user, meta hits are hits which provides information about the collection of hits, on the query, the service and so on.

        The query specifies a window into a larger result list that must be returned from the searcher through hits and offset; Searchers which returns list of hits in the top level in the result must return at least hits number of hits (or if impossible; all that are available), starting at the given offset. In addition, searchers are allowed to return any number of meta hits (although this number is expected to be low). For hits contained in nested hit groups, the concept of a window defined by hits and offset is not well defined and does not apply.

        Error handling in searchers:

        • Unexpected events: Throw any RuntimeException. This query will fail with the exception message, and the error will be logged
        • Expected events: Create (new Result(Query, ErrorMessage) or add result.setErrorIfNoOtherErrors(ErrorMessage) an error message to the Result.
        • Recoverable user errors: Add a FeedbackHit explaining the condition and how to correct it.
        Specified by:
        search in class Searcher
        Parameters:
        query - the query
        Returns:
        the result of making this query

      • fill

        public void fill​(Result result,
                 java.lang.String summaryClass,
                 Execution execution)
        Description copied from class: Searcher
        Fill hit properties with data using the given summary class. Calling this on already filled results has no cost.

        This needs to be overridden by federating searchers to contact search sources again by propagating the fill call down through the search chain, and by source searchers which talks to fill capable backends to request the data to be filled. Other searchers do not need to override this.

        Overrides:
        fill in class Searcher
        Parameters:
        result - the result to fill
        summaryClass - the name of the collection of fields to fetch the values of, or null to use the default

      • getQueryCount

        public int getQueryCount()
        Returns the number of queries made to this searcher since the last reset. For testing - not reliable if multiple threads makes queries simultaneously

      • resetQueryCount

        public void resetQueryCount()