如何在自定义Solr筛选器中向文档添加新字段

问题描述

我正在Solr中编写一个自定义过滤器，以将令牌发布到Apache Stanbol进行增强，并将响应编入同一文档中不同字段的索引.

I am writing a custom filter in Solr to post a token to Apache Stanbol for enhancement and index the response to a different field in the same document.

在下面的测试代码中，我得到了Stanbol响应并将其作为新文档添加到Solr.我的要求是将stanbolResponse作为字段值添加到被索引的同一文档中.我认为如果可以从过滤器中的TokenStream检索文档ID，则可以完成此操作.

In my test code below I have got the Stanbol response and have added it as a new document to Solr. My requirement is to add the stanbolResponse as a field value to the same document being indexed.I think this can be done if I can retrieve the document Id from the TokenStream in the filter.

任何人都可以通过示例代码/示例或有关如何实现此目标的链接来帮助我吗?

Can anyone please help me with a sample code/example or a link on how to achieve this?

public boolean incrementToken() throws IOException {
    if (!input.incrementToken()) {
      return false;
    }

    int length = charTermAttr.length();
    char[] buffer = charTermAttr.buffer();
    String content = new String(buffer);
    Client client = Client.create();
    WebResource webResource = client.resource(stanbol_endpoint + "enhancer");
    ClientResponse response = webResource
        .type(MediaType.TEXT_PLAIN)
        .accept(new MediaType("application", "rdf+xml"))
        .entity(content2,MediaType.TEXT_PLAIN)
        .post(ClientResponse.class);

    int status = response.getStatus();
    if (status != 200 && status != 201 && status != 202) {
        throw new RuntimeException("Failed : HTTP error code : "
             + response.getStatus());
    }

    String output = response.getEntity(String.class);
    charTermAttr.setEmpty();
    char[] newBuffer = output.toCharArray();
    charTermAttr.copyBuffer(newBuffer, 0, newBuffer.length);

    SolrInputDocument doc1 = new SolrInputDocument();
    doc1.addField( "id", "id1", 1.0f );
    doc1.addField("stanbolResponse", output);
    try {
        server.add(doc1);
        server.commit();
    } catch (SolrServerException e) {
        System.out.println("error while indexing response to solr");
        e.printStackTrace();
    }
    return true;
}

推荐答案

通过编写自定义UpdateRequestProcessor并配置/update请求处理程序以在update.chain中使用我的自定义处理器，成功解决了该用例.

This usecase was successfuly covered by writing a custom UpdateRequestProcessor and configuring the /update request handler to use my custom processor in the update.chain.

在建立索引之前，我能够处理文档并将其添加到文档中.下面是我如何使用自定义处理器配置/update请求处理程序.

I was able to process and add new fields to the document prior to indexing.Below is how I configured my /update request handler with my custom processor.

stanbol流程的RequestProcessor:

RequestProcessor for stanbol process:

<updateRequestProcessorChain name="stanbolInterceptor">
    <processor class="com.solr.stanbol.processor.StanbolContentProcessorFactory"/>
    <processor class="solr.RunUpdateProcessorFactory" />
</updateRequestProcessorChain>

使用上面的链配置请求处理程序以进行update.chain:

configure the request-handler with above chain for update.chain:

<requestHandler name="/update" class="solr.UpdateRequestHandler">
       <lst name="defaults">
         <str name="update.chain">stanbolInterceptor</str>
       </lst>
</requestHandler>

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