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| | 1 | /* |
| | 2 | * Copyright (c) 2005, 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 com.sun.net.httpserver.spi; |
| | 27 | |
| | 28 | import java.io.FileDescriptor; |
| | 29 | import java.io.IOException; |
| | 30 | import java.net.*; |
| | 31 | import java.security.AccessController; |
| | 32 | import java.security.PrivilegedAction; |
| | 33 | import java.util.Iterator; |
| | 34 | import sun.misc.Service; |
| | 35 | import sun.misc.ServiceConfigurationError; |
| | 36 | import sun.security.action.GetPropertyAction; |
| | 37 | import com.sun.net.httpserver.*; |
| | 38 | |
| | 39 | /** |
| | 40 | * Service provider class for HttpServer. |
| | 41 | * Sub-classes of HttpServerProvider provide an implementation of {@link HttpServer} and |
| | 42 | * associated classes. Applications do not normally use this class. |
| | 43 | * See {@link #provider()} for how providers are found and loaded. |
| | 44 | */ |
| | 45 | public abstract class HttpServerProvider { |
| | 46 | |
| | 47 | /** |
| | 48 | * creates a HttpServer from this provider |
| | 49 | * @param addr the address to bind to. May be <code>null</code> |
| | 50 | * @param backlog the socket backlog. A value of <code>zero</code> means the systems default |
| | 51 | */ |
| | 52 | public abstract HttpServer createHttpServer (InetSocketAddress addr, int backlog) throws IOException; |
| | 53 | |
| | 54 | /** |
| | 55 | * creates a HttpsServer from this provider |
| | 56 | * @param addr the address to bind to. May be <code>null</code> |
| | 57 | * @param backlog the socket backlog. A value of <code>zero</code> means the systems default |
| | 58 | */ |
| | 59 | public abstract HttpsServer createHttpsServer (InetSocketAddress addr, int backlog) throws IOException; |
| | 60 | |
| | 61 | |
| | 62 | |
| | 63 | private static final Object lock = new Object(); |
| | 64 | private static HttpServerProvider provider = null; |
| | 65 | |
| | 66 | /** |
| | 67 | * Initializes a new instance of this class. </p> |
| | 68 | * |
| | 69 | * @throws SecurityException |
| | 70 | * If a security manager has been installed and it denies |
| | 71 | * {@link RuntimePermission}<tt>("httpServerProvider")</tt> |
| | 72 | */ |
| | 73 | protected HttpServerProvider() { |
| | 74 | SecurityManager sm = System.getSecurityManager(); |
| | 75 | if (sm != null) |
| | 76 | sm.checkPermission(new RuntimePermission("httpServerProvider")); |
| | 77 | } |
| | 78 | |
| | 79 | private static boolean loadProviderFromProperty() { |
| | 80 | String cn = System.getProperty("com.sun.net.httpserver.HttpServerProvider"); |
| | 81 | if (cn == null) |
| | 82 | return false; |
| | 83 | try { |
| | 84 | Class c = Class.forName(cn, true, |
| | 85 | ClassLoader.getSystemClassLoader()); |
| | 86 | provider = (HttpServerProvider)c.newInstance(); |
| | 87 | return true; |
| | 88 | } catch (ClassNotFoundException x) { |
| | 89 | throw new ServiceConfigurationError(x); |
| | 90 | } catch (IllegalAccessException x) { |
| | 91 | throw new ServiceConfigurationError(x); |
| | 92 | } catch (InstantiationException x) { |
| | 93 | throw new ServiceConfigurationError(x); |
| | 94 | } catch (SecurityException x) { |
| | 95 | throw new ServiceConfigurationError(x); |
| | 96 | } |
| | 97 | } |
| | 98 | |
| | 99 | private static boolean loadProviderAsService() { |
| | 100 | Iterator i = Service.providers(HttpServerProvider.class, |
| | 101 | ClassLoader.getSystemClassLoader()); |
| | 102 | for (;;) { |
| | 103 | try { |
| | 104 | if (!i.hasNext()) |
| | 105 | return false; |
| | 106 | provider = (HttpServerProvider)i.next(); |
| | 107 | return true; |
| | 108 | } catch (ServiceConfigurationError sce) { |
| | 109 | if (sce.getCause() instanceof SecurityException) { |
| | 110 | // Ignore the security exception, try the next provider |
| | 111 | continue; |
| | 112 | } |
| | 113 | throw sce; |
| | 114 | } |
| | 115 | } |
| | 116 | } |
| | 117 | |
| | 118 | /** |
| | 119 | * Returns the system wide default HttpServerProvider for this invocation of |
| | 120 | * the Java virtual machine. |
| | 121 | * |
| | 122 | * <p> The first invocation of this method locates the default provider |
| | 123 | * object as follows: </p> |
| | 124 | * |
| | 125 | * <ol> |
| | 126 | * |
| | 127 | * <li><p> If the system property |
| | 128 | * <tt>com.sun.net.httpserver.HttpServerProvider</tt> is defined then it is |
| | 129 | * taken to be the fully-qualified name of a concrete provider class. |
| | 130 | * The class is loaded and instantiated; if this process fails then an |
| | 131 | * unspecified unchecked error or exception is thrown. </p></li> |
| | 132 | * |
| | 133 | * <li><p> If a provider class has been installed in a jar file that is |
| | 134 | * visible to the system class loader, and that jar file contains a |
| | 135 | * provider-configuration file named |
| | 136 | * <tt>com.sun.net.httpserver.HttpServerProvider</tt> in the resource |
| | 137 | * directory <tt>META-INF/services</tt>, then the first class name |
| | 138 | * specified in that file is taken. The class is loaded and |
| | 139 | * instantiated; if this process fails then an unspecified unchecked error or exception is |
| | 140 | * thrown. </p></li> |
| | 141 | * |
| | 142 | * <li><p> Finally, if no provider has been specified by any of the above |
| | 143 | * means then the system-default provider class is instantiated and the |
| | 144 | * result is returned. </p></li> |
| | 145 | * |
| | 146 | * </ol> |
| | 147 | * |
| | 148 | * <p> Subsequent invocations of this method return the provider that was |
| | 149 | * returned by the first invocation. </p> |
| | 150 | * |
| | 151 | * @return The system-wide default HttpServerProvider |
| | 152 | */ |
| | 153 | public static HttpServerProvider provider () { |
| | 154 | synchronized (lock) { |
| | 155 | if (provider != null) |
| | 156 | return provider; |
| | 157 | return (HttpServerProvider)AccessController |
| | 158 | .doPrivileged(new PrivilegedAction<Object>() { |
| | 159 | public Object run() { |
| | 160 | if (loadProviderFromProperty()) |
| | 161 | return provider; |
| | 162 | if (loadProviderAsService()) |
| | 163 | return provider; |
| | 164 | provider = new sun.net.httpserver.DefaultHttpServerProvider(); |
| | 165 | return provider; |
| | 166 | } |
| | 167 | }); |
| | 168 | } |
| | 169 | } |
| | 170 | |
| | 171 | } |