| /* |
| * 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.accumulo.server.replication; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| import java.util.Map.Entry; |
| |
| import org.apache.accumulo.server.ServerContext; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.collect.Maps; |
| |
| public class ReplicaSystemFactory { |
| private static final Logger log = LoggerFactory.getLogger(ReplicaSystemFactory.class); |
| |
| /** |
| * @param value |
| * {@link ReplicaSystem} implementation class name |
| * @return A {@link ReplicaSystem} object from the given name |
| */ |
| public ReplicaSystem get(ServerContext context, String value) { |
| final Entry<String,String> entry = parseReplicaSystemConfiguration(value); |
| |
| try { |
| Class<?> clz = Class.forName(entry.getKey()); |
| |
| if (ReplicaSystem.class.isAssignableFrom(clz)) { |
| Object o = clz.getDeclaredConstructor().newInstance(); |
| ReplicaSystem rs = (ReplicaSystem) o; |
| rs.configure(context, entry.getValue()); |
| return rs; |
| } |
| |
| throw new IllegalArgumentException( |
| "Class is not assignable to ReplicaSystem: " + entry.getKey()); |
| } catch (ReflectiveOperationException e) { |
| log.error("Error creating ReplicaSystem object", e); |
| throw new IllegalArgumentException(e); |
| } |
| } |
| |
| /** |
| * Parse the configuration value for a peer into its components: {@link ReplicaSystem} class name |
| * and configuration string. |
| * |
| * @param value |
| * The configuration value for a replication peer. |
| * @return An entry where the set is the replica system name and the value is the configuration |
| * string. |
| */ |
| public Entry<String,String> parseReplicaSystemConfiguration(String value) { |
| requireNonNull(value); |
| |
| int index = value.indexOf(','); |
| if (index == -1) { |
| throw new IllegalArgumentException( |
| "Expected comma separator between replication system name and configuration"); |
| } |
| |
| String name = value.substring(0, index); |
| String configuration = value.substring(index + 1); |
| return Maps.immutableEntry(name, configuration); |
| } |
| |
| /** |
| * Generate the configuration value for a {@link ReplicaSystem} in the instance properties |
| * |
| * @param system |
| * The desired ReplicaSystem to use |
| * @param configuration |
| * Configuration string for the desired ReplicaSystem |
| * @return Value to set for peer configuration in the instance |
| */ |
| public static String getPeerConfigurationValue(Class<? extends ReplicaSystem> system, |
| String configuration) { |
| String systemName = system.getName() + ","; |
| if (configuration == null) { |
| return systemName; |
| } |
| |
| return systemName + configuration; |
| } |
| } |