| /* |
| * 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.cassandra.schema; |
| |
| import javax.inject.Provider; |
| |
| import org.apache.commons.lang3.StringUtils; |
| |
| import org.apache.cassandra.exceptions.ConfigurationException; |
| import org.apache.cassandra.utils.FBUtilities; |
| |
| /** |
| * Provides the instance of SchemaUpdateHandler factory pointed by {@link #SUH_FACTORY_CLASS_PROPERTY} system property. |
| * If the property is not defined, the default factory {@link DefaultSchemaUpdateHandler} instance is returned. |
| */ |
| public class SchemaUpdateHandlerFactoryProvider implements Provider<SchemaUpdateHandlerFactory> |
| { |
| public static final String SUH_FACTORY_CLASS_PROPERTY = "cassandra.schema.update_handler_factory.class"; |
| |
| public final static SchemaUpdateHandlerFactoryProvider instance = new SchemaUpdateHandlerFactoryProvider(); |
| |
| @Override |
| public SchemaUpdateHandlerFactory get() |
| { |
| String suhFactoryClassName = StringUtils.trimToNull(System.getProperty(SUH_FACTORY_CLASS_PROPERTY)); |
| if (suhFactoryClassName == null) |
| { |
| return DefaultSchemaUpdateHandlerFactory.instance; |
| } |
| else |
| { |
| Class<SchemaUpdateHandlerFactory> suhFactoryClass = FBUtilities.classForName(suhFactoryClassName, "schema update handler factory"); |
| try |
| { |
| return suhFactoryClass.newInstance(); |
| } |
| catch (InstantiationException | IllegalAccessException ex) |
| { |
| throw new ConfigurationException(String.format("Failed to initialize schema update handler factory class %s defined in %s system property.", |
| suhFactoryClassName, SUH_FACTORY_CLASS_PROPERTY), ex); |
| } |
| } |
| } |
| } |