| /* |
| * 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.jackrabbit.oak.run.osgi; |
| |
| import java.io.IOException; |
| import java.lang.reflect.Method; |
| import java.net.JarURLConnection; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.util.Enumeration; |
| import java.util.List; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.AbstractIterator; |
| import com.google.common.collect.Iterators; |
| import com.google.common.collect.Lists; |
| import org.apache.felix.connect.Revision; |
| import org.apache.felix.connect.launch.BundleDescriptor; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * For running PojoSR based application in Spring Boot environment we need to provide |
| * a custom Revision implementation. Default PojoSR JarRevision support works for normal |
| * jar files while in Spring Boot env jar files are embedded withing another jar. |
| * |
| * This class does not have direct dependency on Spring Boot Jar Launcher but relies |
| * on reflection as the Spring Jar support is not visible to PojoSR classloader |
| */ |
| class SpringBootSupport { |
| private static Logger log = LoggerFactory.getLogger(SpringBootSupport.class); |
| |
| public static final String SPRING_BOOT_PACKAGE = "org.springframework.boot.loader.jar"; |
| |
| public static List<BundleDescriptor> processDescriptors(List<BundleDescriptor> descriptors) |
| throws IOException { |
| List<BundleDescriptor> processed = Lists.newArrayList(); |
| for (BundleDescriptor desc : descriptors) { |
| if (desc.getRevision() == null) { |
| URL u = new URL(desc.getUrl()); |
| URLConnection uc = u.openConnection(); |
| if (uc instanceof JarURLConnection |
| && uc.getClass().getName().startsWith(SPRING_BOOT_PACKAGE)) { |
| Revision rev = new SpringBootJarRevision(((JarURLConnection) uc).getJarFile(), |
| uc.getLastModified()); |
| desc = new BundleDescriptor(desc.getClassLoader(), desc.getUrl(), desc.getHeaders(), |
| rev, desc.getServices()); |
| } |
| } |
| processed.add(desc); |
| } |
| return processed; |
| } |
| |
| /** |
| * Key change here is use of org.springframework.boot.loader.jar.JarEntry.getUrl() |
| * to get a working URL which allows access to files present in embedded jars |
| */ |
| private static class SpringBootJarRevision implements Revision { |
| private static Method ENTRY_URL_METHOD; |
| private final JarFile jarFile; |
| private final long lastModified; |
| |
| private SpringBootJarRevision(JarFile jarFile, long lastModified) { |
| this.jarFile = jarFile; |
| //Taken from org.apache.felix.connect.JarRevision |
| if (lastModified > 0) { |
| this.lastModified = lastModified; |
| } else { |
| this.lastModified = System.currentTimeMillis(); |
| } |
| } |
| |
| @Override |
| public long getLastModified() { |
| return lastModified; |
| } |
| |
| @Override |
| public URL getEntry(String entryName) { |
| try { |
| JarEntry jarEntry = jarFile.getJarEntry(entryName); |
| /* |
| JarEntry here is instance of org.springframework.boot.loader.jar.JarEntry |
| However as that class is loaded in different classloader and not visible |
| actual invocation has to be done via reflection. URL returned here has proper |
| Handler configured to allow reverse access via URL connection |
| */ |
| if (jarEntry != null) { |
| return (URL) getUrlMethod(jarEntry).invoke(jarEntry); |
| } |
| } catch (Exception e) { |
| log.warn("Error occurred while fetching jar entry {} from {}", entryName, jarFile, e); |
| } |
| return null; |
| } |
| |
| @Override |
| public Enumeration<String> getEntries() { |
| final Enumeration<JarEntry> e = jarFile.entries(); |
| return Iterators.asEnumeration(new AbstractIterator<String>() { |
| @Override |
| protected String computeNext() { |
| if (e.hasMoreElements()){ |
| return e.nextElement().getName(); |
| } |
| return endOfData(); |
| } |
| }); |
| } |
| |
| private static Method getUrlMethod(JarEntry jarEntry) throws NoSuchMethodException { |
| if (ENTRY_URL_METHOD == null){ |
| Preconditions.checkState(jarEntry.getClass().getName().startsWith(SPRING_BOOT_PACKAGE), |
| "JarEntry class %s does not belong to Spring package", jarEntry.getClass()); |
| ENTRY_URL_METHOD = jarEntry.getClass().getDeclaredMethod("getUrl"); |
| ENTRY_URL_METHOD.setAccessible(true); |
| } |
| return ENTRY_URL_METHOD; |
| } |
| } |
| } |