indexes/src/main/java/org/apache/geode_examples/indexes/Example.java

/*
 * 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.
 */
package org.apache.geode_examples.indexes;

import org.apache.geode.cache.Region;
import org.apache.geode.cache.client.ClientCache;
import org.apache.geode.cache.client.ClientCacheFactory;
import org.apache.geode.cache.client.ClientRegionFactory;
import org.apache.geode.cache.client.ClientRegionShortcut;
import org.apache.geode.cache.query.FunctionDomainException;
import org.apache.geode.cache.query.NameResolutionException;
import org.apache.geode.cache.query.QueryInvocationTargetException;
import org.apache.geode.cache.query.QueryService;
import org.apache.geode.cache.query.SelectResults;
import org.apache.geode.cache.query.TypeMismatchException;

public class Example {
  static String REGIONNAME = "example-region";
  static String NON_INDEXED_QUERY = "SELECT DISTINCT * FROM /" + REGIONNAME;
  static String TOP_LEVEL_INDEX_QUERY =
      "SELECT DISTINCT * FROM /" + REGIONNAME + " p WHERE p.name LIKE $1";
  static String NESTED_INDEX_QUERY =
      "SELECT DISTINCT * FROM /" + REGIONNAME + " p WHERE p.flight.airlineCode=$1";

  public static void main(String[] args) {
    // connect to the locator using default port 10334
    ClientCache cache = new ClientCacheFactory().addPoolLocator("127.0.0.1", 10334)
        .set("log-level", "WARN").create();

    Example example = new Example();

    // create a local region that matches the server region
    ClientRegionFactory<String, Passenger> clientRegionFactory =
        cache.createClientRegionFactory(ClientRegionShortcut.PROXY);
    Region<String, Passenger> region = clientRegionFactory.create("example-region");
    QueryService queryService = cache.getQueryService();

    RegionPopulator populator = new RegionPopulator();
    populator.populateRegion(region);

    System.out.println("Total number of passengers: "
        + example.countResults(queryService, NON_INDEXED_QUERY, new Object[] {}));
    for (String lastName : populator.lastNames) {
      System.out.println("Flights for " + lastName + ": " + example.countResults(queryService,
          TOP_LEVEL_INDEX_QUERY, new Object[] {"%" + lastName}));
    }
    for (String airline : populator.airlines) {
      System.out.println("Flights for " + airline + ": "
          + example.countResults(queryService, NESTED_INDEX_QUERY, new Object[] {airline}));
    }

    cache.close();
  }

  int countResults(QueryService queryService, String queryString, Object[] params) {
    try {
      int count = 0;
      SelectResults<Passenger> results =
          (SelectResults<Passenger>) queryService.newQuery(queryString).execute(params);
      for (Passenger passenger : results) {
        ++count;
      }
      return count;
    } catch (FunctionDomainException | TypeMismatchException | NameResolutionException
        | QueryInvocationTargetException e) {
      e.printStackTrace();
      return -1;
    }
  }
}