Examples of org.apache.solr.request.SolrRequestHandler

org.apache.solr.request.SolrRequestHandler
Implementations of SolrRequestHandler are called to handle query requests. Different SolrRequestHandlers are registered with the SolrCore. One way to register a SolrRequestHandler with the core is thorugh the solrconfig.xml file.
Example solrconfig.xml entry to register a SolrRequestHandler implementation to handle all queries with a query type of "test":
<requestHandler name="test" class="solr.tst.TestRequestHandler" />
A single instance of any registered SolrRequestHandler is created via the default constructor and is reused for all relevant queries. @version $Id: SolrRequestHandler.java 898152 2010-01-12 02:19:56Z ryan $


    // Testing backwards-compatible behavior.
    // Returns 1 collation as a single string.
    // All words are "correct" per the dictionary, but this collation would
    // return no results if tried.
    SolrRequestHandler handler = core.getRequestHandler("spellCheckCompRH");
    SolrQueryResponse rsp = new SolrQueryResponse();
    rsp.add("responseHeader", new SimpleOrderedMap());
    SolrQueryRequest req = new LocalSolrQueryRequest(core, params);
    handler.handleRequest(req, rsp);
    req.close();
    NamedList values = rsp.getValues();
    NamedList spellCheck = (NamedList) values.get("spellcheck");
    NamedList suggestions = (NamedList) spellCheck.get("suggestions");
    String singleCollation = (String) suggestions.get("collation");
    assertEquals("lowerfilt:(+faith +homer +loaves)", singleCollation);


    // Testing backwards-compatible response format but will only return a
    // collation that would return results.
    params.remove(SpellCheckComponent.SPELLCHECK_BUILD);
    params.add(SpellCheckComponent.SPELLCHECK_MAX_COLLATION_TRIES, "5");
    params.add(SpellCheckComponent.SPELLCHECK_MAX_COLLATIONS, "1");
    handler = core.getRequestHandler("spellCheckCompRH");
    rsp = new SolrQueryResponse();
    rsp.add("responseHeader", new SimpleOrderedMap());
    req = new LocalSolrQueryRequest(core, params);
    handler.handleRequest(req, rsp);
    req.close();
    values = rsp.getValues();
    spellCheck = (NamedList) values.get("spellcheck");
    suggestions = (NamedList) spellCheck.get("suggestions");
    singleCollation = (String) suggestions.get("collation");
    assertEquals("lowerfilt:(+faith +hope +loaves)", singleCollation);


    // Testing returning multiple collations if more than one valid
    // combination exists.
    params.remove(SpellCheckComponent.SPELLCHECK_MAX_COLLATION_TRIES);
    params.remove(SpellCheckComponent.SPELLCHECK_MAX_COLLATIONS);
    params.add(SpellCheckComponent.SPELLCHECK_MAX_COLLATION_TRIES, "10");
    params.add(SpellCheckComponent.SPELLCHECK_MAX_COLLATIONS, "2");
    handler = core.getRequestHandler("spellCheckCompRH");
    rsp = new SolrQueryResponse();
    rsp.add("responseHeader", new SimpleOrderedMap());
    req = new LocalSolrQueryRequest(core, params);
    handler.handleRequest(req, rsp);
    req.close();
    values = rsp.getValues();
    spellCheck = (NamedList) values.get("spellcheck");
    suggestions = (NamedList) spellCheck.get("suggestions");
    List<String> collations = suggestions.getAll("collation");
    assertTrue(collations.size() == 2);
    for (String multipleCollation : collations) {
      assertTrue(multipleCollation.equals("lowerfilt:(+faith +hope +love)")
          || multipleCollation.equals("lowerfilt:(+faith +hope +loaves)"));
    }


    // Testing return multiple collations with expanded collation response
    // format.
    params.add(SpellCheckComponent.SPELLCHECK_COLLATE_EXTENDED_RESULTS, "true");
    handler = core.getRequestHandler("spellCheckCompRH");
    rsp = new SolrQueryResponse();
    rsp.add("responseHeader", new SimpleOrderedMap());
    req = new LocalSolrQueryRequest(core, params);
    handler.handleRequest(req, rsp);
    req.close();
    values = rsp.getValues();
    spellCheck = (NamedList) values.get("spellcheck");
    suggestions = (NamedList) spellCheck.get("suggestions");
    List<NamedList> expandedCollationList = suggestions.getAll("collation");

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    /**
     * Wait for the first request before initializing the wrapped handler 
     */
    public void handleRequest(SolrQueryRequest req, SolrQueryResponse rsp)  {
      SolrRequestHandler handler = _handler;
      if (handler == null) {
        handler = getWrappedHandler();
      }
      handler.handleRequest( req, rsp );
    }

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    public synchronized SolrRequestHandler getWrappedHandler()
    {
      if( _handler == null ) {
        try {
          SolrRequestHandler handler = core.createRequestHandler(_className);
          handler.init( _args );


          if( handler instanceof SolrCoreAware ) {
            ((SolrCoreAware)handler).inform( core );
          }
          _handler = handler;

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  public void testXInclude() throws Exception {
    //Figure out whether this JVM supports XInclude anyway, if it doesn't then don't run this test????
    // TODO: figure out a better way to handle this.
    if (supports == true){
      SolrCore core = h.getCore();
      SolrRequestHandler solrRequestHandler = core.getRequestHandler("dismaxOldStyleDefaults");
      assertNotNull("Solr Req Handler is null", solrRequestHandler);
    } else {
      log.info("Didn't run testXInclude, because this XML DocumentBuilderFactory doesn't support it");
    }

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      throw new SolrException(SolrException.ErrorCode.SERVICE_UNAVAILABLE, "Service disabled", true);
    }
    
    // Get the RequestHandler
    String qt = required.get( CommonParams.QT );
    SolrRequestHandler handler = core.getRequestHandler( qt );
    if( handler == null ) {
      throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, 
          "Unknown RequestHandler: "+qt );
    }

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    params.add(CommonParams.Q, "*:*");


    params.add(ClusteringParams.USE_SEARCH_RESULTS, "true");




    SolrRequestHandler handler = core.getRequestHandler("standard");
    SolrQueryResponse rsp;
    rsp = new SolrQueryResponse();
    rsp.add("responseHeader", new SimpleOrderedMap());
    SolrQueryRequest req = new LocalSolrQueryRequest(core, params);
    handler.handleRequest(req, rsp);
    NamedList values = rsp.getValues();
    Object clusters = values.get("clusters");
    //System.out.println("Clusters: " + clusters);
    assertTrue("clusters is null and it shouldn't be", clusters != null);
    req.close();


    params = new ModifiableSolrParams();
    params.add(ClusteringComponent.COMPONENT_NAME, "true");
    params.add(ClusteringParams.ENGINE_NAME, "mock");
    params.add(ClusteringParams.USE_COLLECTION, "true");
    params.add(QueryComponent.COMPONENT_NAME, "false");


    handler = core.getRequestHandler("docClustering");


    rsp = new SolrQueryResponse();
    rsp.add("responseHeader", new SimpleOrderedMap());
    req = new LocalSolrQueryRequest(core, params);
    handler.handleRequest(req, rsp);
    values = rsp.getValues();
    clusters = values.get("clusters");
    //System.out.println("Clusters: " + clusters);
    assertTrue("clusters is null and it shouldn't be", clusters != null);
    req.close();

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  }


  @Test
  public void testInitCount() {
    SolrCore core = h.getCore();
    SolrRequestHandler handler = core.getRequestHandler( "mock" );
    assertEquals("Incorrect init count",
                 1, handler.getStatistics().get("initCount"));
  }

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  }


  @Test
  public void testLazyLoading() {
    SolrCore core = h.getCore();
    SolrRequestHandler handler = core.getRequestHandler( "lazy" );
    assertFalse( handler instanceof StandardRequestHandler ); 
    
    assertU(adoc("id", "42",
                 "name", "Zapp Brannigan"));
    assertU(adoc("id", "43",

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  @Test
  public void testPathNormalization()
  {
    SolrCore core = h.getCore();
    SolrRequestHandler h1 = core.getRequestHandler("/update/csv" );
    assertNotNull( h1 );


    SolrRequestHandler h2 = core.getRequestHandler("/update/csv/" );
    assertNotNull( h2 );
    
    assertEquals( h1, h2 ); // the same object
    
    assertNull( core.getRequestHandler("/update/csv/asdgadsgas" ) ); // prefix

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    ModifiableSolrParams params = new ModifiableSolrParams();
    params.add(CommonParams.Q, "id:0");
    params.add(CommonParams.QT, "tvrh");
    params.add(TermVectorParams.TF, "true");
    params.add(TermVectorComponent.COMPONENT_NAME, "true");
    SolrRequestHandler handler = core.getRequestHandler("tvrh");
    SolrQueryResponse rsp;
    rsp = new SolrQueryResponse();
    rsp.add("responseHeader", new SimpleOrderedMap());
    handler.handleRequest(new LocalSolrQueryRequest(core, params), rsp);
    NamedList values = rsp.getValues();
    NamedList termVectors = (NamedList) values.get(TermVectorComponent.TERM_VECTORS);
    assertTrue("termVectors is null and it shouldn't be", termVectors != null);
    System.out.println("TVs:" + termVectors);
    NamedList doc = (NamedList) termVectors.getVal(0);

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org.apache.solr.core.RequestHandlersTest

org.apache.solr.core.SolrCore

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org.apache.solr.handler.clustering.ClusteringComponentTest

org.apache.solr.handler.component.SpellCheckComponentTest

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