AGSpogiCache.java

package com.franz.agbase.examples;

import com.franz.agbase.*;

public class AGSpogiCache {

    /**
     * Demonstrates how to use the SPOGI Cache to speed up queries.
     * 
     * @param args unused
     * @throws AllegroGraphException 
     */
    public static void main(String[] args) throws AllegroGraphException {
        
        // Connect to server, which must already be running.
        AllegroGraphConnection ags = new AllegroGraphConnection();
        try {
            ags.enable();
        } catch (Exception e) {
            throw new AllegroGraphException("Server connection problem", e);
        }
        
        // Create fresh triple-store for this example.
        AllegroGraph ts = ags.renew("sparqlengine", AGPaths.TRIPLE_STORES);
        
        // Show default SPOGI Cache settings
        System.out.println("Default SPOGI Cache Size: " + ts.getSPOGICacheSize());
        System.out.println("Default SPOGI Cache Enabled: " + ts.isSPOGICacheEnabled());
        
        // Enable the SPOGI Cache
        ts.setSPOGICacheSize(1000000);
        ts.setSPOGICacheEnabled(true);
        
        // Show new settings
        System.out.println("SPOGI Cache Size: " + ts.getSPOGICacheSize());
        System.out.println("SPOGI Cache Enabled: " + ts.isSPOGICacheEnabled());
        
        // Load the Kennedy data set
        AGLoadNtriples.loadNTriplesWithTiming(ts, AGPaths.dataSources("kennedy.ntriples"));

        // Index the store
        AGIndexAllTriples.indexAllTriplesWithTiming(ts);
        
        // A query written with no particular consideration for efficiency. 
        String query =
            "PREFIX ex: <http://example.org/kennedy/> " +
            "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> " +
            "SELECT ?father ?mother ?child ?univ " + 
            "WHERE {" +
                "?father rdf:type ex:person . " +
                "?mother rdf:type ex:person . " +
                "?mother ex:spouse ?father . " +
                "?child rdf:type ex:person . " +
                "?father ex:has-child ?child . " +
                "?mother ex:has-child ?child . " +
                "?father ex:alma-mater ?univ . " +
                "?child ex:alma-mater ?univ . " +
            "}";
        
        // Query the store (and populate the SPOGI cache)
        SPARQLQuery sq = new SPARQLQuery();
        sq.setTripleStore(ts);
        sq.setQuery(query);
        sq.setPlanner(SPARQLQuery.PLANNER.IDENTITY);
        long start = System.currentTimeMillis();
        AGSparqlSelect.doSparqlSelect(sq);
        System.out.println("done in " + AGUtils.elapsedTime(start));
        
        // Query the store again
        start = System.currentTimeMillis();
        AGSparqlSelect.doSparqlSelect(sq);
        System.out.println("done in " + AGUtils.elapsedTime(start));

        // Close the triple store and disconnect from the server.
        ts.closeTripleStore();
        ags.disable();
    }

}

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