TrustEngineExample.java Source code

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Here is the source code for TrustEngineExample.java

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/*
 * #%L
 * trusthings-client-simple
 * %%
 * Copyright (C) 2014 INNOVA S.p.A
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;

import com.google.common.io.CharStreams;
import com.inn.trusthings.integration.TrustFilterByExclusion;
import com.inn.trusthings.integration.TrustScorer;
import com.inn.trusthings.module.Factory;
import com.inn.trusthings.service.interfaces.TrustManager;

public class TrustEngineExample {

    public void runExample() {

        try {
            //create trust manager
            TrustManager trustManager = Factory.createInstance(TrustManager.class);
            //load (from json file) and set trust criteria 
            InputStream is = TrustEngineExample.class.getResourceAsStream("/criteria/criteria1.json");
            String criteria = CharStreams.toString(new InputStreamReader(is));
            trustManager.setGlobalTrustCriteria(criteria);
            is.close();

            //add some descriptions (trust profiles)
            URI service_a = URI.create("http://localhost/services/CITY_TRAFFIC_SERVICE_A");
            URI service_b = URI.create("http://localhost/services/CITY_TRAFFIC_SERVICE_B");
            URI service_d = URI.create("http://localhost/services/CITY_TRAFFIC_SERVICE_D");
            InputStream r1is = TrustEngineExample.class
                    .getResourceAsStream("/modelrepo/city_traffic_service_A.ttl");
            trustManager.addResourceDescription(service_a, r1is);
            r1is.close();
            InputStream r2is = TrustEngineExample.class
                    .getResourceAsStream("/modelrepo/city_traffic_service_B.ttl");
            trustManager.addResourceDescription(service_b, r2is);
            r2is.close();
            InputStream r3is = TrustEngineExample.class
                    .getResourceAsStream("/modelrepo/city_traffic_service_D.ttl");
            trustManager.addResourceDescription(service_d, r3is);
            r3is.close();
            /*
             * SCORING
             */
            //create trust scorer and pass trustManager
            TrustScorer s = new TrustScorer(trustManager);
            //obtain and print trust indexes for resources
            System.out.println(service_a.toASCIIString() + " has trust index value:" + s.apply(service_a));
            System.out.println(service_b.toASCIIString() + " has trust index value:" + s.apply(service_b));
            System.out.println(service_b.toASCIIString() + " has trust index value:" + s.apply(service_d));

            /*
             * FILTERING
             */
            //create trust filer to filter out those not trusted
            TrustFilterByExclusion f = new TrustFilterByExclusion(trustManager);
            //obtain trust indexes for resources
            System.out.println(service_a.toASCIIString() + " is trusted = " + f.apply(service_a));
            System.out.println(service_b.toASCIIString() + " is trusted = " + f.apply(service_b));
            System.out.println(service_b.toASCIIString() + " is trusted = " + f.apply(service_d));

        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void main(String[] args) {
        new TrustEngineExample().runExample();
    }

}