| /******************************************************************************* |
| * Copyright (c) 2005, 2016 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.osgi.internal.loader.buddy; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.util.*; |
| import org.eclipse.osgi.container.ModuleWire; |
| import org.eclipse.osgi.container.ModuleWiring; |
| import org.eclipse.osgi.internal.loader.BundleLoader; |
| import org.osgi.framework.namespace.BundleNamespace; |
| import org.osgi.framework.namespace.PackageNamespace; |
| |
| /** |
| * DependentPolicy is an implementation of a buddy policy. |
| * It is responsible for looking up a class in the dependents of the bundle |
| * to which this policy is attached to. |
| */ |
| public class DependentPolicy implements IBuddyPolicy { |
| BundleLoader buddyRequester; |
| int lastDependentOfAdded = -1; //remember the index of the bundle for which we last added the dependent |
| List<ModuleWiring> allDependents = null; //the list of all dependents known so far |
| |
| public DependentPolicy(BundleLoader requester) { |
| buddyRequester = requester; |
| |
| //Initialize with the first level of dependent the list |
| allDependents = new ArrayList<>(); |
| basicAddImmediateDependents(requester.getWiring()); |
| //If there is no dependent, reset to null |
| if (allDependents.size() == 0) |
| allDependents = null; |
| } |
| |
| public Class<?> loadClass(String name) { |
| if (allDependents == null) |
| return null; |
| |
| Class<?> result = null; |
| //size may change, so we must check it every time |
| for (int i = 0; i < allDependents.size() && result == null; i++) { |
| ModuleWiring searchWiring = allDependents.get(i); |
| BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader(); |
| if (searchLoader != null) { |
| try { |
| result = searchLoader.findClass(name); |
| } catch (ClassNotFoundException e) { |
| if (result == null) |
| addDependent(i, searchWiring); |
| } |
| } |
| } |
| return result; |
| } |
| |
| private synchronized void addDependent(int i, ModuleWiring searchedWiring) { |
| if (i > lastDependentOfAdded) { |
| lastDependentOfAdded = i; |
| basicAddImmediateDependents(searchedWiring); |
| } |
| } |
| |
| public URL loadResource(String name) { |
| if (allDependents == null) |
| return null; |
| |
| URL result = null; |
| //size may change, so we must check it every time |
| for (int i = 0; i < allDependents.size() && result == null; i++) { |
| ModuleWiring searchWiring = allDependents.get(i); |
| BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader(); |
| if (searchLoader != null) { |
| result = searchLoader.findResource(name); |
| if (result == null) { |
| addDependent(i, searchWiring); |
| } |
| } |
| } |
| return result; |
| } |
| |
| public Enumeration<URL> loadResources(String name) { |
| if (allDependents == null) |
| return null; |
| |
| Enumeration<URL> results = null; |
| //size may change, so we must check it every time |
| for (int i = 0; i < allDependents.size(); i++) { |
| ModuleWiring searchWiring = allDependents.get(i); |
| BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader(); |
| if (searchLoader != null) { |
| try { |
| results = BundleLoader.compoundEnumerations(results, searchLoader.findResources(name)); |
| addDependent(i, searchWiring); |
| } catch (IOException e) { |
| //Ignore and keep looking |
| } |
| } |
| } |
| return results; |
| } |
| |
| private void basicAddImmediateDependents(ModuleWiring wiring) { |
| List<ModuleWire> providedWires = wiring.getProvidedModuleWires(null); |
| if (providedWires != null) { |
| for (ModuleWire wire : providedWires) { |
| String namespace = wire.getRequirement().getNamespace(); |
| if (PackageNamespace.PACKAGE_NAMESPACE.equals(namespace) || BundleNamespace.BUNDLE_NAMESPACE.equals(namespace)) { |
| ModuleWiring dependent = wire.getRequirerWiring(); |
| if (!allDependents.contains(dependent)) { |
| allDependents.add(dependent); |
| } |
| } |
| } |
| } |
| } |
| } |