I am not sure on what you are trying to achieve.

 

Drools is a Rule Engine and not a XML parser; the nearest I could find to what you are reporting ("I know XML Streaming is possible in Drools") is the following. 

 

http://netzooid.com/blog/2007/03/16/sxc-simple-xml-compiler-jaxb-runtime-streaming-xpath-implementation-and-more/

 

Can you enlighten me with your knowledge of XML Streaming in Drools?

---

From: Gupta, Ankit (Ankit) [mailto:gupta11@avaya.com]
Sent: 29 January 2009 10:04
To: Anstis, Michael (M.)
Subject: RE: [rules-users] Parsing XML using Drools

Hi Mike,

            Thanks for prompt reply ,

Actually right now I am streaming the xml

<BenchmarkResultsFor>

   <Benchmark>DataProcessing</Benchmark>

   <Workload>1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16</Workload>

   <Memory>4, 4, 4, 8, 8, 12, 12, 16, 24, 24, 24, 24, 24, 24, 24, 24</Memory>

</BenchmarkResultsFor>

 

here we are using apache math api for interpolation

 

public MemoryBenchmarkResult(String name, double[] x, double[] y) {

this.hostFunction = name;

// Create the interpolation function

SplineInterpolator i1 = new SplineInterpolator();

this.workload = x;

this.memory = y;

this.interpolator = i1.interpolate(this.workload, this.memory);

}

 

here we are passing the values of X Axis (Workload) and we get the values of Y Axis (Memory ). Reading or Streaming of this XML are doing using SAX .

This thing I want to do with Drools ...... as I know XML Streaming is possible in Drools  .

 

 

Regards

Ankit

 

 

 

---

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Anstis, Michael (M.)
Sent: Thursday, January 29, 2009 2:48 PM
To: Rules Users List
Subject: RE: [rules-users] Parsing XML using Drools

It is not clear how you want to use the XML?

 

If the XML represents Facts then you could use a worker Fact and "FROM" to deserialise them and make them available to WM. For example:-

 

rule "get some XML facts"

    when

        $w : Worker()

        Cheese( ) from $w.getCheesesFromXML();

    then

        //Do something with cheese

    end

 

Obviously the XML need not be true serialised objects (in a JAXB sense) but simply the properties that "getCheeseFromXML" rehydrates.

 

Drools is not exposing any of the XML libraries; they are merely used by your code. The above would be (partially) equivalent to:-

 

Worker w = new Worker();

List<Cheese> cheeses = w.getCheesesFromXML();

for(Cheese c : cheeses) {

    wm.insert(c);

}

 

rule "Cheese pre-loaded"

    when

        Cheese( )

    then

        //Do something with cheese

    end

 

Partially equivalent as you could retract Cheese( ) in the second way which would affect truth maintenance whereas the first way would (I believe) not.

 

With kind regards,

 

Mike

---

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Gupta, Ankit (Ankit)
Sent: 29 January 2009 07:22
To: rules-users@lists.jboss.org
Subject: [rules-users] Parsing XML using Drools

Hi All,

          How can we read and parse a XML file using drools ?

 

Does Drools support the SAX or DOM parsing .

 

 

Regards

 

Ankit

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