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/*
 * 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.activemq.artemis.utils;

import java.net.URL;
import java.util.Properties;

import org.apache.activemq.artemis.shaded.org.jboss.logging.Logger;

/**
 * This class will be used to perform generic class-loader operations,
 * such as load a class first using TCCL, and then the classLoader used by ActiveMQ Artemis (ClassloadingUtil.getClass().getClassLoader()).
 * 

* Is't required to use a Security Block on any calls to this class. */ public final class ClassloadingUtil { private static final Logger logger = Logger.getLogger(ClassloadingUtil.class); private static final String INSTANTIATION_EXCEPTION_MESSAGE = "Your class must have a constructor without arguments. If it is an inner class, it must be static!"; public static Object newInstanceFromClassLoader(final String className) { return newInstanceFromClassLoader(ClassloadingUtil.class, className); } public static Object newInstanceFromClassLoader(final Class classOwner, final String className) { ClassLoader loader = classOwner.getClassLoader(); try { Class clazz = loader.loadClass(className); return clazz.newInstance(); } catch (Throwable t) { if (t instanceof InstantiationException) { System.out.println(INSTANTIATION_EXCEPTION_MESSAGE); } loader = Thread.currentThread().getContextClassLoader(); if (loader == null) throw new RuntimeException("No local context classloader", t); try { return loader.loadClass(className).newInstance(); } catch (InstantiationException e) { throw new RuntimeException(INSTANTIATION_EXCEPTION_MESSAGE + " " + className, e); } catch (ClassNotFoundException e) { throw new IllegalStateException(e); } catch (IllegalAccessException e) { throw new RuntimeException(e); } } } public static Object newInstanceFromClassLoader(final String className, Object... objs) { return newInstanceFromClassLoader(ClassloadingUtil.class, className, objs); } public static Object newInstanceFromClassLoader(final Class classOwner, final String className, Object... objs) { ClassLoader loader = classOwner.getClassLoader(); try { Class[] parametersType = new Class[objs.length]; for (int i = 0; i < objs.length; i++) { parametersType[i] = objs[i].getClass(); } Class clazz = loader.loadClass(className); return clazz.getConstructor(parametersType).newInstance(objs); } catch (Throwable t) { if (t instanceof InstantiationException) { System.out.println(INSTANTIATION_EXCEPTION_MESSAGE); } loader = Thread.currentThread().getContextClassLoader(); if (loader == null) throw new RuntimeException("No local context classloader", t); try { return loader.loadClass(className).newInstance(); } catch (InstantiationException e) { throw new RuntimeException(INSTANTIATION_EXCEPTION_MESSAGE + " " + className, e); } catch (ClassNotFoundException e) { throw new IllegalStateException(e); } catch (IllegalAccessException e) { throw new RuntimeException(e); } } } public static URL findResource(final String resourceName) { return findResource(ClassloadingUtil.class.getClassLoader(), resourceName); } public static URL findResource(ClassLoader loader, final String resourceName) { try { URL resource = loader.getResource(resourceName); if (resource != null) return resource; } catch (Throwable t) { } loader = Thread.currentThread().getContextClassLoader(); if (loader == null) return null; return loader.getResource(resourceName); } public static String loadProperty(ClassLoader loader, String propertiesFile, String name) { Properties properties = loadProperties(loader, propertiesFile); return (String)properties.get(name); } public static Properties loadProperties(String propertiesFile) { return loadProperties(ClassloadingUtil.class.getClassLoader(), propertiesFile); } public static Properties loadProperties(ClassLoader loader, String propertiesFile) { Properties properties = new Properties(); try { URL url = findResource(loader, propertiesFile); if (url != null) { properties.load(url.openStream()); } } catch (Throwable ignored) { logger.warn(ignored); } return properties; } }





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