Package com.yahoo.search.pagetemplates

Class PageTemplateSearcher

  • All Implemented Interfaces:
    com.yahoo.component.Component, java.lang.Comparable<com.yahoo.component.Component>
    public class PageTemplateSearcher
extends Searcher
    Enables page optimization templates. This searcher should be placed before federation points in the search chain.

    Input query properties:

    • page.idList - a List<String> of id strings of the page templates this should choose between
    • page.id - a space-separated string of ids of the page templates this should choose between. This property is ignored if page.idList is set
    • page.resolver the id of the resolver to use to resolve choices. This is either the component id of a deployed resolver component, or one of the strings native.deterministic (which always pics the last choice) or native.random
    Output query properties:
    • page.ListOfPageTemplateA List<PageTemplate> containing a list of the page templates used for this query

    The set of page templates chosen for the query specifies a list of sources to be queried (the page template sources). In addition, the query may contain

    • a set of sources set explicitly in the Request, a query property or a searcher (the query model sources)
    • a set of sources specified in the IntentModel (the intent model sources)
    This searcher combines these sources into a single set in query.model by the following rules:
    • If the query model sources is set (not empty), it is not changed
    • If the page template sources contains the ANY source AND there is an intent model the query model sources is set to the union of the page template sources and the intent model sources
    • If the page template sources contains the ANY source AND there is no intent model, the query model sources is left empty (causing all sources to be queried)
    • Otherwise, the query model sources is set to the page template sources
    Author:
    bratseth

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static com.yahoo.processing.request.CompoundName pageIdListName
      The name of the query property containing a list of candidate pages to consider
      static com.yahoo.processing.request.CompoundName pageIdName
      The name of the query property containing the page id to use
      static com.yahoo.processing.request.CompoundName pagePageTemplateListName
      The name of the query property containing the resolved candidate page template list
      static com.yahoo.processing.request.CompoundName pageResolverName
      The name of the query property containing the resolver id to use

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

        isDeconstructable

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      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

      • pagePageTemplateListName

        public static final com.yahoo.processing.request.CompoundName pagePageTemplateListName
        The name of the query property containing the resolved candidate page template list

      • pageIdListName

        public static final com.yahoo.processing.request.CompoundName pageIdListName
        The name of the query property containing a list of candidate pages to consider

      • pageIdName

        public static final com.yahoo.processing.request.CompoundName pageIdName
        The name of the query property containing the page id to use

      • pageResolverName

        public static final com.yahoo.processing.request.CompoundName pageResolverName
        The name of the query property containing the resolver id to use

    • Constructor Detail

      • PageTemplateSearcher

        @Inject
public PageTemplateSearcher​(PageTemplatesConfig pageTemplatesConfig,
                            com.yahoo.component.provider.ComponentRegistry<Resolver> resolverRegistry)
        Creates this from a configuration. This will be called by the container.

      • PageTemplateSearcher

        public PageTemplateSearcher​(PageTemplateRegistry templateRegistry,
                            Resolver... resolvers)
        Creates this from an existing page template registry, using only built-in resolvers
        Parameters:
        templateRegistry - the page template registry. This will be frozen by this call.
        resolvers - the resolvers to use, in addition to the default resolvers

    • Method Detail

      • 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