| /** |
| * 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.fineract.commands.provider; |
| |
| import com.google.common.base.Preconditions; |
| import org.apache.commons.lang3.ArrayUtils; |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.fineract.commands.annotation.CommandType; |
| import org.apache.fineract.commands.exception.UnsupportedCommandException; |
| import org.apache.fineract.commands.handler.NewCommandSourceHandler; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.springframework.beans.BeansException; |
| import org.springframework.context.ApplicationContext; |
| import org.springframework.context.ApplicationContextAware; |
| import org.springframework.context.annotation.Scope; |
| import org.springframework.stereotype.Component; |
| |
| import javax.annotation.Nonnull; |
| import java.util.HashMap; |
| |
| /** |
| * {@link CommandHandlerProvider} provides {@link NewCommandSourceHandler}s for a given entity and action.<br/> |
| * <br/> |
| * A {@link NewCommandSourceHandler} can be registered and the annotation {@link CommandType} is used to determine |
| * the entity and the action the handler is capable to process. |
| * |
| * @author Markus Geiss |
| * @version 1.0 |
| * @since 15.06 |
| * @see NewCommandSourceHandler |
| * @see CommandType |
| */ |
| @Component |
| @Scope("singleton") |
| public class CommandHandlerProvider implements ApplicationContextAware { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(CommandHandlerProvider.class); |
| |
| private ApplicationContext applicationContext; |
| private HashMap<String, String> registeredHandlers; |
| |
| CommandHandlerProvider() { |
| super(); |
| } |
| |
| /** |
| * Returns a handler for the given entity and action.<br/> |
| * <br/> |
| * Throws an {@link UnsupportedCommandException} if no handler |
| * for the given entity, action combination can be found. |
| * @param entity the entity to lookup the handler, must be given. |
| * @param action the action to lookup the handler, must be given. |
| */ |
| @Nonnull |
| public NewCommandSourceHandler getHandler (@Nonnull final String entity, @Nonnull final String action) { |
| Preconditions.checkArgument(StringUtils.isNoneEmpty(entity), "An entity must be given!"); |
| Preconditions.checkArgument(StringUtils.isNoneEmpty(action), "An action must be given!"); |
| |
| final String key = entity + "|" + action; |
| if (!this.registeredHandlers.containsKey(key)) { |
| throw new UnsupportedCommandException(key); |
| } |
| return (NewCommandSourceHandler)this.applicationContext.getBean(this.registeredHandlers.get(key)); |
| } |
| |
| private void initializeHandlerRegistry() { |
| if (this.registeredHandlers == null) { |
| this.registeredHandlers = new HashMap<>(); |
| |
| final String[] commandHandlerBeans = this.applicationContext.getBeanNamesForAnnotation(CommandType.class); |
| if (ArrayUtils.isNotEmpty(commandHandlerBeans)) { |
| for (final String commandHandlerName : commandHandlerBeans) { |
| LOGGER.info("Register command handler '" + commandHandlerName + "' ..."); |
| final CommandType commandType = this.applicationContext.findAnnotationOnBean(commandHandlerName, CommandType.class); |
| try { |
| this.registeredHandlers.put(commandType.entity() + "|" + commandType.action(), commandHandlerName); |
| } catch (final Throwable th) { |
| LOGGER.error("Unable to register command handler '" + commandHandlerName + "'!", th); |
| } |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { |
| this.applicationContext = applicationContext; |
| this.initializeHandlerRegistry(); |
| } |
| } |