| /* |
| * 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.connectors.jdbc; |
| |
| import java.sql.SQLException; |
| |
| import org.apache.geode.annotations.Experimental; |
| import org.apache.geode.cache.CacheLoader; |
| import org.apache.geode.cache.CacheLoaderException; |
| import org.apache.geode.cache.LoaderHelper; |
| import org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback; |
| import org.apache.geode.connectors.jdbc.internal.SqlHandler; |
| import org.apache.geode.internal.cache.InternalCache; |
| |
| /** |
| * This class provides loading from a data source using JDBC. |
| * |
| * @since Geode 1.4 |
| */ |
| @Experimental |
| public class JdbcLoader<K, V> extends AbstractJdbcCallback implements CacheLoader<K, V> { |
| |
| @SuppressWarnings("unused") |
| public JdbcLoader() { |
| super(); |
| } |
| |
| // Constructor for test purposes only |
| JdbcLoader(SqlHandler sqlHandler, InternalCache cache) { |
| super(sqlHandler, cache); |
| } |
| |
| /** |
| * @return this method always returns a PdxInstance. It does not matter what the V generic |
| * parameter is set to. |
| */ |
| @Override |
| public V load(LoaderHelper<K, V> helper) throws CacheLoaderException { |
| checkInitialized(helper.getRegion()); |
| try { |
| // The following cast to V is to keep the compiler happy |
| // but is erased at runtime and no actual cast happens. |
| return (V) getSqlHandler().read(helper.getRegion(), helper.getKey()); |
| } catch (SQLException e) { |
| throw JdbcConnectorException.createException(e); |
| } |
| } |
| } |