SOLR dataimport data import source code analysis (1)

SOLR's request processing interface is solrrequesthandler. java. The handlerequest method is used to process requests from HTTP.

/*************************************** ********************************
* Module: solrrequesthandler. Java
* Author: Administrator
* Purpose: defines the interface solrrequesthandler
**************************************** *******************************/

Import java. util .*;

/** @ Pdoid 92641501-9fac-4850-bf72-43e262d42eff */
Public interface solrrequesthandler {
/** @ Param ARGs
* @ Pdoid 0d916c92-cb61-408c-844d-a756cc1e9a41 */
Void Init (namedlist ARGs );
/** @ Param req
* @ Param RSP
* @ Pdoid 35c91800-4167-49d1-aefe-c961fb7082d1 */
Void handlerequest (solrqueryrequest req, solrqueryresponse RSP );

}

The common implementation class is requesthandlerbase. java.

/*************************************** ********************************

* Module: requesthandlerbase. Java
* Author: Administrator
* Purpose: defines the class requesthandlerbase
**************************************** *******************************/

Import java. util .*;

/** @ Pdoid 9e2891cc-6977-4d7e-86f8-d406a3493599 */
Public abstract class requesthandlerbase implements solrrequesthandler {
/** @ Param ARGs
* @ Pdoid 48f0c55d-b3a3-4736-8e47-1c866398eeef */
Public void Init (namedlist ARGs ){

}

/** @ Param req
* @ Param RSP
* @ Exception
* @ Pdoid 3eec0a97-ed48-4f4e-b78b-142247478b69 */
Public abstract void handlerequestbody (solrqueryrequest req, solrqueryresponse RSP) throws exception;
/** @ Param req
* @ Param RSP
* @ Pdoid 7b97a1ac-509c-4a03-aaed-a2bbd320dbcc */
Public void handlerequest (solrqueryrequest req, solrqueryresponse RSP ){

}

}

This is an abstract class. The abstract method handlerequestbody is implemented by sub-classes. The real processing logic is implemented by the sub-class handlerequestbody method.

Handlerequest calls the handlerequestbody method of the subclass. This is a typical template method design mode.

The implementation class for data import is dataimporthandler. java. The sample code is as follows:

/*************************************** ********************************

* Module: dataimporthandler. Java
* Author: Administrator
* Purpose: defines the class dataimporthandler
**************************************** *******************************/

Import java. util .*;

/** @ Pdoid 1277dd7d-601d-45c7-a2ef-1836f46db6f3 */
Public class dataimporthandler extends requesthandlerbase {
/** @ Pdoid 6e53bcab-98f0-4ce1-97a0-1c15e9be51ac */
Private dataimporter importer;

/** @ Param req
* @ Param RSP
* @ Exception
* @ Pdoid 15ebeea5-1faf-4d9d-89bb-3c4be63bf15a */
Public void handlerequestbody (solrqueryrequest req, solrqueryresponse RSP) throws exception {
Importer. runcmd (requestparams, SW );

}

}

The dataimporthandler class holds the reference of dataimporter and calls the related methods of the dataimporter class for further processing.

The brief class diagram is as follows: