1 /* 2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.internal.loader; 27 28 import java.lang.module.Configuration; 29 import java.lang.module.ResolvedModule; 30 import java.util.HashMap; 31 import java.util.List; 32 import java.util.Map; 33 import java.util.stream.Stream; 34 35 /** 36 * A pool of class loaders. 37 * 38 * @see ModuleLayer#defineModulesWithManyLoaders 39 */ 40 public final class LoaderPool { 41 42 /** Maps module names to class loaders. */ 43 private final Map<String, Loader> loaders; 44 45 46 /** 47 * Creates a pool of class loaders. Each module in the given configuration 48 * will be loaded its own class loader in the pool. The class loader is 49 * created with the given parent class loader as its parent. 50 */ 51 public LoaderPool(Configuration cf, 52 List<ModuleLayer> parentLayers, 53 ClassLoader parentLoader) 54 { 55 Map<String, Loader> loaders = new HashMap<>(); 56 for (ResolvedModule resolvedModule : cf.modules()) { 57 Loader loader = new Loader(resolvedModule, this, parentLoader); 58 String mn = resolvedModule.name(); 59 loaders.put(mn, loader); 60 } 61 this.loaders = loaders; 62 63 // complete the initialization 64 loaders.values().forEach(l -> l.initRemotePackageMap(cf, parentLayers)); 65 } 66 67 68 /** 69 * Returns the class loader for the named module 70 */ 71 public Loader loaderFor(String name) { 72 Loader loader = loaders.get(name); 73 assert loader != null; 74 return loader; 75 } 76 77 /** 78 * Returns a stream of the loaders in this pool. 79 */ 80 public Stream<Loader> loaders() { 81 return loaders.values().stream(); 82 } 83 84 }