| /* |
| * 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.jdbc; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| 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.ClientRegionShortcut; |
| import org.apache.geode.pdx.ReflectionBasedAutoSerializer; |
| |
| public class Example { |
| private final Region<Long, Parent> region; |
| |
| public Example(Region<Long, Parent> region) { |
| this.region = region; |
| } |
| |
| public static void main(String[] args) { |
| // connect to the locator using default port 10334 |
| ClientCache cache = |
| new ClientCacheFactory().addPoolLocator("127.0.0.1", 10334) |
| .setPdxSerializer( |
| new ReflectionBasedAutoSerializer("org.apache.geode_examples.jdbc.Parent")) |
| .create(); |
| |
| // create a local region that connects to the server region |
| Region<Long, Parent> region = |
| cache.<Long, Parent>createClientRegionFactory(ClientRegionShortcut.PROXY).create("Parent"); |
| System.out.println("Region=" + region.getFullPath()); |
| |
| Example example = new Example(region); |
| |
| // Put entry in Parent region to verify it propagates to the external RDBMS table |
| Long key = Long.valueOf(1); |
| Parent value = new Parent(key, "Parent_1", Double.valueOf(123456789.0)); |
| region.put(key, value); |
| System.out.println("Region.put() added an entry into Parent region. The key is " + key |
| + ", and the value is " + value + "."); |
| System.out.println( |
| "If JDBC Connector is configured, the value will be persisted to external data source."); |
| // Get an entry from Parent region that will trigger the cache loader to |
| // retrieve the entry from the external table |
| System.out.println( |
| "Calling Region.get(). If JDBC Connector is configured, it will retrieve data from external data source and return a non-null value."); |
| key = Long.valueOf(2); |
| Parent parent = (Parent) region.get(key); |
| System.out.println("The returned value of Region.get(" + key + ") is " + parent + "."); |
| |
| // Print the current entries in the region |
| System.out.println("All entries currently in Parent region"); |
| example.printValues(example.getKeys()); |
| |
| cache.close(); |
| } |
| |
| Set<Long> getKeys() { |
| return new HashSet<>(region.keySetOnServer()); |
| } |
| |
| void printValues(Set<Long> values) { |
| values.forEach(key -> System.out.println(String.format("%d:%s", key, region.get(key)))); |
| } |
| |
| } |