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/* |
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* This file is part of SingleInstance. |
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* |
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* SingleInstance is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* SingleInstance is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with SingleInstance. If not, see <https://www.gnu.org/licenses/>. |
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* |
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* Copyright (c) 2020 Vincent Quatrevieux |
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*/ |
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package fr.quatrevieux.singleinstance.ipc.consumer; |
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import fr.quatrevieux.singleinstance.ipc.Message; |
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import java.util.HashMap; |
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import java.util.Map; |
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import java.util.function.Consumer; |
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import java.util.function.Function; |
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/** |
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* {@link fr.quatrevieux.singleinstance.ipc.InstanceServer} consumer implementation |
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* allowing transformation of the received message, based on the message name. |
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* |
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* Usage: |
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* <pre>{@code |
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* // Create the consumer |
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* MessageTransformerConsumer consumer = new MessageTransformerConsumer(message -> { |
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* // Switch on the message type |
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* if (message instanceof Foo) { |
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* // ... |
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* } else if (message instanceof Bar) { |
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* // ... |
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* } else { |
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* System.out.println("Unsupported message"); |
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* } |
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* }); |
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* |
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* // Register transformers |
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* consumer.register("Foo", message -> new Foo(message.data())); |
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* consumer.register("Bar", message -> new Bar(message.data())); |
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* |
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* // Start consume messages |
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* SingleInstance.onMessage(consumer); |
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* }</pre> |
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* |
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* @see fr.quatrevieux.singleinstance.ipc.InstanceServer#consume(Consumer) |
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*/ |
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final public class MessageTransformerConsumer implements Consumer<Message> { |
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final private Consumer<Message> next; |
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final private Map<String, Function<Message, Message>> transformers = new HashMap<>(); |
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public MessageTransformerConsumer(Consumer<Message> next) { |
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this.next = next; |
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} |
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/** |
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* Register a new message transformer |
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* |
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* Usage: |
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* <pre>{@code |
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* MessageTransformerConsumer consumer = xxx; |
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* |
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* consumer |
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* .register("Foo", message -> new Foo(message.data())) |
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* .register("Bar", message -> new Bar(message.data())) |
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* ; |
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* }</pre> |
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* |
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* @param messageName The message name {@link Message#name()} |
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* @param transformer The transformer function. If the transformer returns null, the message will be ignored. |
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* |
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* @return this instance |
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*/ |
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public MessageTransformerConsumer register(String messageName, Function<Message, Message> transformer) { |
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transformers.put(messageName, transformer); |
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return this; |
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} |
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@Override |
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public void accept(Message message) { |
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Function<Message, Message> transformer = transformers.get(message.name()); |
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if (transformer != null) { |
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message = transformer.apply(message); |
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} |
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if (message != null) { |
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next.accept(message); |
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} |
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} |
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} |
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vincent4vx /
SingleInstance
