Github user ejwhite922 commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/144#discussion_r105437184
--- Diff: extras/indexingExample/src/main/java/ProspectorExample.java ---
@@ -0,0 +1,193 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+import java.util.List;
+
+import org.apache.hadoop.util.ToolRunner;
+import org.apache.log4j.ConsoleAppender;
+import org.apache.log4j.Level;
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+import org.apache.log4j.PatternLayout;
+import org.apache.rya.accumulo.AccumuloRdfConfiguration;
+import org.apache.rya.accumulo.utils.ConnectorFactory;
+import org.apache.rya.api.persist.RdfEvalStatsDAO.CARDINALITY_OF;
+import org.apache.rya.prospector.mr.Prospector;
+import org.apache.rya.prospector.service.ProspectorServiceEvalStatsDAO;
+import org.apache.rya.sail.config.RyaSailFactory;
+import org.openrdf.model.Statement;
+import org.openrdf.model.URI;
+import org.openrdf.model.ValueFactory;
+import org.openrdf.model.impl.ValueFactoryImpl;
+import org.openrdf.sail.Sail;
+import org.openrdf.sail.SailConnection;
+
+import com.beust.jcommander.internal.Lists;
+
+/**
+ * Demonstrates how you can use the {@link Prospector} to count values
that appear within an instance of Rya and
+ * then use the {@link ProspectorServiceEvalStatsDAO} to fetch those
counts.
+ */
+public class ProspectorExample {
+ private static final Logger log =
Logger.getLogger(RyaClientExample.class);
+
+ private static final ValueFactory VALUE_FACTORY = new
ValueFactoryImpl();
+
+ private static final URI ALICE = VALUE_FACTORY.createURI("urn:alice");
+ private static final URI BOB = VALUE_FACTORY.createURI("urn:bob");
+ private static final URI CHARLIE =
VALUE_FACTORY.createURI("urn:charlie");
+
+ private static final URI WORKS_AT =
VALUE_FACTORY.createURI("urn:worksAt");
+ private static final URI ADMIRES =
VALUE_FACTORY.createURI("urn:admires");
+ private static final URI LIVES_WITH =
VALUE_FACTORY.createURI("urn:livesWith");
+
+ private static final URI BURGER_JOINT =
VALUE_FACTORY.createURI("urn:burgerJoint");
+ private static final URI DONUT_SHOP=
VALUE_FACTORY.createURI("urn:donutShop");
+
+ public static void main(final String[] args) throws Exception {
+ setupLogging();
+
+ // Configure Rya to use a mock instance.
+ final AccumuloRdfConfiguration config = new
AccumuloRdfConfiguration();
+ config.useMockInstance(true);
+ config.setTablePrefix("rya_");
+ config.setUsername("user");
+ config.setPassword("pass");
+ config.setInstanceName("accumulo");
+
+ // Load some data into Rya.
+ final List<Statement> statements = Lists.newArrayList(
+ VALUE_FACTORY.createStatement(ALICE, WORKS_AT,
BURGER_JOINT),
+ VALUE_FACTORY.createStatement(ALICE, ADMIRES, BOB),
+ VALUE_FACTORY.createStatement(BOB, WORKS_AT, DONUT_SHOP),
+ VALUE_FACTORY.createStatement(CHARLIE, WORKS_AT,
DONUT_SHOP),
+ VALUE_FACTORY.createStatement(CHARLIE, LIVES_WITH, BOB),
+ VALUE_FACTORY.createStatement(BOB, LIVES_WITH, CHARLIE),
+ VALUE_FACTORY.createStatement(BOB, LIVES_WITH, ALICE));
+
+ final Sail sail = RyaSailFactory.getInstance(config);
+ final SailConnection conn = sail.getConnection();
+ log.info("Loading the following statements into a Mock instance of
Accumulo Rya:");
+ conn.begin();
+ for(final Statement statement : statements) {
+ log.info(" " + statement.toString());
+ conn.addStatement(statement.getSubject(),
statement.getPredicate(), statement.getObject());
+ }
+ conn.commit();
+ conn.close();
+
+ // Create the table that the Prospector's results will be written
to.
+ ConnectorFactory.connect(config)
+ .tableOperations()
+ .create("rya_prospects");
+
+ // Run the Prospector using the configuration file that is in the
resources directory.
+ log.info("");
+ log.info("Running the Map Reduce job that computes the Prospector
results.");
+ ToolRunner.run(new Prospector(), new String[]{
"src/main/resources/stats_cluster_config.xml" });
+
+ // Print the table that was created by the Prospector.
+ log.info("");
+ log.info("The following cardinalities were written to the
Prospector table:");
+ final ProspectorServiceEvalStatsDAO dao =
ProspectorServiceEvalStatsDAO.make(config);
+
+ // Do each of the Subjects.
+ double cardinality = dao.getCardinality(config,
CARDINALITY_OF.SUBJECT, Lists.newArrayList(ALICE));
--- End diff --
A lot of code duplication here. Could be changed to
```
private static void displayCardinality(final ProspectorServiceEvalStatsDAO
dao, final AccumuloRdfConfiguration config, final CARDINALITY_OF cardinalityOf,
final List<URI> uris) {
final double cardinality = dao.getCardinality(config, cardinalityOf,
uris);
log.info(" " + cardinalityOf.toString() + ": " +
Joiner.on("/").join(uris) + ", cardinality: " + cardinality);
}
...
...
final ImmutableMap<CARDINALITY_OF, List<List<URI>>> map =
ImmutableMap.<CARDINALITY_OF, List<List<URI>>>builder()
.put(CARDINALITY_OF.SUBJECT,
Lists.newArrayList(
Lists.newArrayList(ALICE),
Lists.newArrayList(BOB),
Lists.newArrayList(CHARLIE)
)
)
.put(CARDINALITY_OF.OBJECT,
Lists.newArrayList(
Lists.newArrayList(WORKS_WITH),
Lists.newArrayList(ADMIRES),
Lists.newArrayList(LIVES_WITH)
)
)
...
.build();
for (final Entry<CARDINALITY_OF, List<List<URI>>> entry : map.entrySet()) {
final CARDINALITY_OF cardinalityOf = entry.getKey();
for (final List<URI> uris : entry.getValue()) {
displayCardinality(dao, config, cardinalityOf, uris);
}
}
```
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