1 /* |
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2 * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.jmx.remote.internal; |
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27 |
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28 import java.util.Properties; |
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29 import java.io.IOException; |
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30 import java.rmi.Remote; |
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31 import java.rmi.NoSuchObjectException; |
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32 |
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33 import java.security.AccessController; |
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34 import java.security.PrivilegedAction; |
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35 |
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36 /** |
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37 * A helper class for RMI-IIOP and CORBA APIs. |
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38 */ |
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39 |
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40 public final class IIOPHelper { |
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41 private IIOPHelper() { } |
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42 |
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43 // loads IIOPProxy implementation class if available |
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44 private static final String IMPL_CLASS = |
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45 "com.sun.jmx.remote.protocol.iiop.IIOPProxyImpl"; |
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46 private static final IIOPProxy proxy = |
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47 AccessController.doPrivileged(new PrivilegedAction<IIOPProxy>() { |
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48 public IIOPProxy run() { |
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49 try { |
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50 Class<?> c = Class.forName(IMPL_CLASS, true, |
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51 IIOPHelper.class.getClassLoader()); |
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52 return (IIOPProxy)c.newInstance(); |
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53 } catch (ClassNotFoundException cnf) { |
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54 return null; |
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55 } catch (InstantiationException e) { |
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56 throw new AssertionError(e); |
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57 } catch (IllegalAccessException e) { |
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58 throw new AssertionError(e); |
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59 } |
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60 }}); |
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61 |
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62 /** |
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63 * Returns true if RMI-IIOP and CORBA is available. |
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64 */ |
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65 public static boolean isAvailable() { |
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66 return proxy != null; |
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67 } |
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68 |
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69 private static void ensureAvailable() { |
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70 if (proxy == null) |
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71 throw new AssertionError("Should not here"); |
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72 } |
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73 |
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74 /** |
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75 * Returns true if the given object is a Stub. |
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76 */ |
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77 public static boolean isStub(Object obj) { |
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78 return (proxy == null) ? false : proxy.isStub(obj); |
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79 } |
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80 |
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81 /** |
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82 * Returns the Delegate to which the given Stub delegates. |
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83 */ |
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84 public static Object getDelegate(Object stub) { |
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85 ensureAvailable(); |
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86 return proxy.getDelegate(stub); |
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87 } |
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88 |
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89 /** |
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90 * Sets the Delegate for a given Stub. |
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91 */ |
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92 public static void setDelegate(Object stub, Object delegate) { |
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93 ensureAvailable(); |
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94 proxy.setDelegate(stub, delegate); |
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95 } |
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96 |
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97 /** |
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98 * Returns the ORB associated with the given stub |
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99 * |
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100 * @throws UnsupportedOperationException |
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101 * if the object does not support the operation that |
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102 * was invoked |
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103 */ |
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104 public static Object getOrb(Object stub) { |
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105 ensureAvailable(); |
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106 return proxy.getOrb(stub); |
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107 } |
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108 |
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109 /** |
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110 * Connects the Stub to the given ORB. |
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111 */ |
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112 public static void connect(Object stub, Object orb) |
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113 throws IOException |
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114 { |
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115 if (proxy == null) |
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116 throw new IOException("Connection to ORB failed, RMI/IIOP not available"); |
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117 proxy.connect(stub, orb); |
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118 } |
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119 |
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120 /** |
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121 * Returns true if the given object is an ORB. |
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122 */ |
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123 public static boolean isOrb(Object obj) { |
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124 return (proxy == null) ? false : proxy.isOrb(obj); |
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125 } |
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126 |
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127 /** |
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128 * Creates, and returns, a new ORB instance. |
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129 */ |
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130 public static Object createOrb(String[] args, Properties props) |
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131 throws IOException |
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132 { |
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133 if (proxy == null) |
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134 throw new IOException("ORB initialization failed, RMI/IIOP not available"); |
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135 return proxy.createOrb(args, props); |
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136 } |
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137 |
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138 /** |
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139 * Converts a string, produced by the object_to_string method, back |
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140 * to a CORBA object reference. |
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141 */ |
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142 public static Object stringToObject(Object orb, String str) { |
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143 ensureAvailable(); |
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144 return proxy.stringToObject(orb, str); |
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145 } |
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146 |
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147 /** |
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148 * Converts the given CORBA object reference to a string. |
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149 */ |
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150 public static String objectToString(Object orb, Object obj) { |
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151 ensureAvailable(); |
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152 return proxy.objectToString(orb, obj); |
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153 } |
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154 |
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155 /** |
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156 * Checks to ensure that an object of a remote or abstract interface |
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157 * type can be cast to a desired type. |
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158 */ |
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159 public static <T> T narrow(Object narrowFrom, Class<T> narrowTo) { |
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160 ensureAvailable(); |
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161 return proxy.narrow(narrowFrom, narrowTo); |
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162 } |
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163 |
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164 /** |
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165 * Makes a server object ready to receive remote calls |
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166 */ |
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167 public static void exportObject(Remote obj) throws IOException { |
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168 if (proxy == null) |
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169 throw new IOException("RMI object cannot be exported, RMI/IIOP not available"); |
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170 proxy.exportObject(obj); |
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171 } |
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172 |
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173 /** |
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174 * Deregisters a server object from the runtime. |
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175 */ |
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176 public static void unexportObject(Remote obj) throws IOException { |
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177 if (proxy == null) |
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178 throw new NoSuchObjectException("Object not exported"); |
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179 proxy.unexportObject(obj); |
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180 } |
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181 |
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182 /** |
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183 * Returns a stub for the given server object. |
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184 */ |
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185 public static Remote toStub(Remote obj) throws IOException { |
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186 if (proxy == null) |
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187 throw new NoSuchObjectException("Object not exported"); |
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188 return proxy.toStub(obj); |
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189 } |
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190 } |
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