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1 /* |
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2 * Copyright 1996-1999 Sun Microsystems, Inc. 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. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 package org.omg.CORBA; |
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27 |
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28 /** |
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29 * An object containing the information necessary for |
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30 * invoking a method. This class is |
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31 * the cornerstone of the ORB Dynamic |
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32 * Invocation Interface (DII), which allows dynamic creation and |
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33 * invocation of requests. |
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34 * A server cannot tell the difference between a client |
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35 * invocation using a client stub and a request using the DII. |
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36 * <P> |
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37 * A <code>Request</code> object consists of: |
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38 * <UL> |
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39 * <LI>the name of the operation to be invoked |
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40 * <LI>an <code>NVList</code> containing arguments for the operation.<BR> |
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41 * Each item in the list is a <code>NamedValue</code> object, which has three |
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42 * parts: |
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43 * <OL> |
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44 * <LI>the name of the argument |
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45 * <LI>the value of the argument (as an <code>Any</code> object) |
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46 * <LI>the argument mode flag indicating whether the argument is |
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47 * for input, output, or both |
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48 * </OL> |
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49 * </UL> |
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50 * <P> |
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51 * <code>Request</code> objects may also contain additional information, |
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52 * depending on how an operation was defined in the original IDL |
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53 * interface definition. For example, where appropriate, they may contain |
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54 * a <code>NamedValue</code> object to hold the return value or exception, |
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55 * a context, a list of possible exceptions, and a list of |
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56 * context strings that need to be resolved. |
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57 * <P> |
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58 * New <code>Request</code> objects are created using one of the |
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59 * <code>create_request</code> methods in the <code>Object</code> class. |
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60 * In other words, a <code>create_request</code> method is performed on the |
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61 * object which is to be invoked. |
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62 * |
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63 * @see org.omg.CORBA.NamedValue |
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64 * |
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65 */ |
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66 |
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67 public abstract class Request { |
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68 |
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69 /** |
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70 * Retrieves the the target object reference. |
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71 * |
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72 * @return the object reference that points to the |
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73 * object implementation for the method |
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74 * to be invoked |
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75 */ |
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76 |
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77 public abstract org.omg.CORBA.Object target(); |
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78 |
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79 /** |
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80 * Retrieves the name of the method to be invoked. |
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81 * |
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82 * @return the name of the method to be invoked |
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83 */ |
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84 |
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85 public abstract String operation(); |
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86 |
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87 /** |
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88 * Retrieves the <code>NVList</code> object containing the arguments |
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89 * to the method being invoked. The elements in the list are |
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90 * <code>NamedValue</code> objects, with each one describing an argument |
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91 * to the method. |
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92 * |
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93 * @return the <code>NVList</code> object containing the arguments |
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94 * for the method |
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95 * |
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96 */ |
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97 |
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98 public abstract NVList arguments(); |
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99 |
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100 /** |
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101 * Retrieves the <code>NamedValue</code> object containing the return |
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102 * value for the method. |
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103 * |
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104 * @return the <code>NamedValue</code> object containing the result |
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105 * of the method |
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106 */ |
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107 |
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108 public abstract NamedValue result(); |
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109 |
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110 /** |
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111 * Retrieves the <code>Environment</code> object for this request. |
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112 * It contains the exception that the method being invoked has |
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113 * thrown (after the invocation returns). |
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114 * |
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115 * |
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116 * @return the <code>Environment</code> object for this request |
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117 */ |
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118 |
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119 public abstract Environment env(); |
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120 |
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121 /** |
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122 * Retrieves the <code>ExceptionList</code> object for this request. |
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123 * This list contains <code>TypeCode</code> objects describing the |
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124 * exceptions that may be thrown by the method being invoked. |
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125 * |
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126 * @return the <code>ExceptionList</code> object describing the exceptions |
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127 * that may be thrown by the method being invoked |
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128 */ |
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129 |
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130 public abstract ExceptionList exceptions(); |
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131 |
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132 /** |
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133 * Retrieves the <code>ContextList</code> object for this request. |
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134 * This list contains context <code>String</code>s that need to |
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135 * be resolved and sent with the invocation. |
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136 * |
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137 * |
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138 * @return the list of context strings whose values |
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139 * need to be resolved and sent with the |
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140 * invocation. |
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141 */ |
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142 |
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143 public abstract ContextList contexts(); |
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144 |
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145 /** |
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146 * Retrieves the <code>Context</code> object for this request. |
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147 * This is a list of properties giving information about the |
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148 * client, the environment, or the circumstances of this request. |
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149 * |
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150 * @return the <code>Context</code> object that is to be used |
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151 * to resolve any context strings whose |
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152 * values need to be sent with the invocation |
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153 */ |
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154 |
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155 public abstract Context ctx(); |
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156 |
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157 /** |
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158 * Sets this request's <code>Context</code> object to the one given. |
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159 * |
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160 * @param c the new <code>Context</code> object to be used for |
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161 * resolving context strings |
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162 */ |
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163 |
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164 public abstract void ctx(Context c); |
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165 |
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166 |
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167 /** |
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168 * Creates an input argument and adds it to this <code>Request</code> |
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169 * object. |
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170 * |
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171 * @return an <code>Any</code> object that contains the |
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172 * value and typecode for the input argument added |
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173 */ |
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174 |
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175 public abstract Any add_in_arg(); |
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176 |
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177 /** |
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178 * Creates an input argument with the given name and adds it to |
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179 * this <code>Request</code> object. |
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180 * |
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181 * @param name the name of the argument being added |
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182 * @return an <code>Any</code> object that contains the |
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183 * value and typecode for the input argument added |
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184 */ |
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185 |
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186 public abstract Any add_named_in_arg(String name); |
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187 |
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188 /** |
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189 * Adds an input/output argument to this <code>Request</code> object. |
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190 * |
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191 * @return an <code>Any</code> object that contains the |
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192 * value and typecode for the input/output argument added |
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193 */ |
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194 |
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195 public abstract Any add_inout_arg(); |
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196 |
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197 /** |
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198 * Adds an input/output argument with the given name to this |
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199 * <code>Request</code> object. |
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200 * |
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201 * @param name the name of the argument being added |
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202 * @return an <code>Any</code> object that contains the |
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203 * value and typecode for the input/output argument added |
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204 */ |
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205 |
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206 public abstract Any add_named_inout_arg(String name); |
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207 |
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208 |
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209 /** |
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210 * Adds an output argument to this <code>Request</code> object. |
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211 * |
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212 * @return an <code>Any</code> object that contains the |
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213 * value and typecode for the output argument added |
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214 */ |
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215 |
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216 public abstract Any add_out_arg(); |
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217 |
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218 /** |
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219 * Adds an output argument with the given name to this |
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220 * <code>Request</code> object. |
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221 * |
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222 * @param name the name of the argument being added |
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223 * @return an <code>Any</code> object that contains the |
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224 * value and typecode for the output argument added |
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225 */ |
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226 |
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227 public abstract Any add_named_out_arg(String name); |
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228 |
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229 /** |
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230 * Sets the typecode for the return |
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231 * value of the method. |
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232 * |
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233 * @param tc the <code>TypeCode</code> object containing type information |
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234 * for the return value |
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235 */ |
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236 |
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237 public abstract void set_return_type(TypeCode tc); |
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238 |
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239 /** |
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240 * Returns the <code>Any</code> object that contains the value for the |
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241 * result of the method. |
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242 * |
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243 * @return an <code>Any</code> object containing the value and |
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244 * typecode for the return value |
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245 */ |
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246 |
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247 public abstract Any return_value(); |
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248 |
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249 /** |
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250 * Makes a synchronous invocation using the |
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251 * information in the <code>Request</code> object. Exception information is |
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252 * placed into the <code>Request</code> object's environment object. |
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253 */ |
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254 |
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255 public abstract void invoke(); |
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256 |
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257 /** |
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258 * Makes a oneway invocation on the |
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259 * request. In other words, it does not expect or wait for a |
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260 * response. Note that this can be used even if the operation was |
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261 * not declared as oneway in the IDL declaration. No response or |
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262 * exception information is returned. |
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263 */ |
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264 |
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265 public abstract void send_oneway(); |
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266 |
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267 /** |
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268 * Makes an asynchronous invocation on |
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269 * the request. In other words, it does not wait for a response before it |
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270 * returns to the user. The user can then later use the methods |
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271 * <code>poll_response</code> and <code>get_response</code> to get |
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272 * the result or exception information for the invocation. |
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273 */ |
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274 |
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275 public abstract void send_deferred(); |
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276 |
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277 /** |
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278 * Allows the user to determine |
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279 * whether a response has been received for the invocation triggered |
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280 * earlier with the <code>send_deferred</code> method. |
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281 * |
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282 * @return <code>true</code> if the method response has |
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283 * been received; <code>false</code> otherwise |
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284 */ |
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285 |
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286 public abstract boolean poll_response(); |
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287 |
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288 /** |
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289 * Allows the user to access the |
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290 * response for the invocation triggered earlier with the |
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291 * <code>send_deferred</code> method. |
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292 * |
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293 * @exception WrongTransaction if the method <code>get_response</code> was invoked |
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294 * from a different transaction's scope than the one from which the |
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295 * request was originally sent. See the OMG Transaction Service specification |
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296 * for details. |
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297 */ |
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298 |
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299 public abstract void get_response() throws WrongTransaction; |
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300 |
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301 }; |