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/* |
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* This file is part of Araknemu. |
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* |
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* Araknemu 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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* Araknemu 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 Araknemu. If not, see <https://www.gnu.org/licenses/>. |
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* |
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* Copyright (c) 2017-2021 Vincent Quatrevieux |
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*/ |
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package fr.quatrevieux.araknemu.game.admin.script; |
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import fr.quatrevieux.araknemu.core.di.Container; |
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import fr.quatrevieux.araknemu.game.admin.Command; |
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import fr.quatrevieux.araknemu.game.admin.context.AbstractContextConfigurator; |
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import fr.quatrevieux.araknemu.game.admin.context.Context; |
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import groovy.util.GroovyScriptEngine; |
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import org.apache.logging.log4j.Logger; |
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import java.io.IOException; |
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import java.lang.reflect.Constructor; |
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import java.lang.reflect.InvocationTargetException; |
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import java.net.MalformedURLException; |
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import java.net.URL; |
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import java.nio.file.Files; |
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import java.nio.file.Path; |
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import java.util.concurrent.atomic.AtomicReference; |
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import java.util.function.Function; |
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import java.util.stream.Stream; |
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/** |
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* Load commands from groovy scripts |
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* |
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* @param <C> The context type |
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*/ |
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public final class ScriptLoaderContextConfigurator<C extends Context> extends AbstractContextConfigurator<C> { |
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private final Path path; |
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private final Function<C, Container> containerResolver; |
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private final Logger logger; |
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private final AtomicReference<GroovyScriptEngine> engine = new AtomicReference<>(); |
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1 |
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public ScriptLoaderContextConfigurator(Path path, Function<C, Container> containerResolver, Logger logger) { |
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this.path = path; |
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this.containerResolver = containerResolver; |
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this.logger = logger; |
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} |
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1 |
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@Override |
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public void configure(C context) { |
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if (!Files.isDirectory(path)) { |
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return; |
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} |
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// Issue #185 : engine must be loaded only if directory exists |
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loadEngine(); |
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final Container container = containerResolver.apply(context); |
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try (Stream<Path> stream = Files.list(path)) { |
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stream.forEach(file -> { |
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logger.debug("Load command script {}", file.toAbsolutePath().toString()); |
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try { |
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final Class type = engine.get().loadScriptByName(file.getFileName().toString()); |
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if (Command.class.isAssignableFrom(type)) { |
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logger.debug("Find command {}", type.getSimpleName()); |
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add(instantiate(container, type)); |
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} |
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} catch (Exception e) { |
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logger.error("Fail to load command script", e); |
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} |
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}); |
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} catch (IOException e) { |
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logger.error("Fail to open commands scripts directory", e); |
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} |
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} |
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private Command instantiate(Container container, Class<? extends Command> type) throws InstantiationException, IllegalAccessException, InvocationTargetException { |
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for (Constructor constructor : type.getConstructors()) { |
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final Object[] parameters = resolveArguments(container, constructor); |
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if (parameters != null) { |
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return (Command) constructor.newInstance(parameters); |
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} |
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} |
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// No constructor found : try to instantiate without constructor |
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return type.newInstance(); |
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} |
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private Object[] resolveArguments(Container container, Constructor constructor) { |
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final Object[] parameters = new Object[constructor.getParameterCount()]; |
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final Class[] parametersTypes = constructor.getParameterTypes(); |
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for (int i = 0; i < parameters.length; ++i) { |
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if (!container.has(parametersTypes[i])) { |
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return null; |
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} |
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parameters[i] = container.get(parametersTypes[i]); |
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} |
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return parameters; |
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} |
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private synchronized void loadEngine() { |
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if (engine.get() != null) { |
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return; |
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} |
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try { |
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engine.set(new GroovyScriptEngine(new URL[] {path.toUri().toURL()})); |
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} catch (MalformedURLException e) { |
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// Should not occurs |
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throw new RuntimeException(); |
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} |
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} |
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} |
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Arakne /
Araknemu
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