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src/share/classes/org/omg/CORBA/Request.java@6845b95cba6b
src/share/classes/org/omg/CORBA/Request.java
Thu, 31 Aug 2017 18:10:36 +0800
- author
- aoqi
- date
- Thu, 31 Aug 2017 18:10:36 +0800
- changeset 748
- 6845b95cba6b
- parent 158
- 91006f157c46
- parent 0
- 7ef37b2cdcad
- permissions
- -rw-r--r--
merge
1 /*
2 * Copyright (c) 1996, 1999, 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 */
26 package org.omg.CORBA;
28 /**
29 * An object containing the information necessary for
30 * invoking a method. This class is
31 * the cornerstone of the ORB Dynamic
32 * Invocation Interface (DII), which allows dynamic creation and
33 * invocation of requests.
34 * A server cannot tell the difference between a client
35 * invocation using a client stub and a request using the DII.
36 * <P>
37 * A <code>Request</code> object consists of:
38 * <UL>
39 * <LI>the name of the operation to be invoked
40 * <LI>an <code>NVList</code> containing arguments for the operation.<BR>
41 * Each item in the list is a <code>NamedValue</code> object, which has three
42 * parts:
43 * <OL>
44 * <LI>the name of the argument
45 * <LI>the value of the argument (as an <code>Any</code> object)
46 * <LI>the argument mode flag indicating whether the argument is
47 * for input, output, or both
48 * </OL>
49 * </UL>
50 * <P>
51 * <code>Request</code> objects may also contain additional information,
52 * depending on how an operation was defined in the original IDL
53 * interface definition. For example, where appropriate, they may contain
54 * a <code>NamedValue</code> object to hold the return value or exception,
55 * a context, a list of possible exceptions, and a list of
56 * context strings that need to be resolved.
57 * <P>
58 * New <code>Request</code> objects are created using one of the
59 * <code>create_request</code> methods in the <code>Object</code> class.
60 * In other words, a <code>create_request</code> method is performed on the
61 * object which is to be invoked.
62 *
63 * @see org.omg.CORBA.NamedValue
64 *
65 */
67 public abstract class Request {
69 /**
70 * Retrieves the the target object reference.
71 *
72 * @return the object reference that points to the
73 * object implementation for the method
74 * to be invoked
75 */
77 public abstract org.omg.CORBA.Object target();
79 /**
80 * Retrieves the name of the method to be invoked.
81 *
82 * @return the name of the method to be invoked
83 */
85 public abstract String operation();
87 /**
88 * Retrieves the <code>NVList</code> object containing the arguments
89 * to the method being invoked. The elements in the list are
90 * <code>NamedValue</code> objects, with each one describing an argument
91 * to the method.
92 *
93 * @return the <code>NVList</code> object containing the arguments
94 * for the method
95 *
96 */
98 public abstract NVList arguments();
100 /**
101 * Retrieves the <code>NamedValue</code> object containing the return
102 * value for the method.
103 *
104 * @return the <code>NamedValue</code> object containing the result
105 * of the method
106 */
108 public abstract NamedValue result();
110 /**
111 * Retrieves the <code>Environment</code> object for this request.
112 * It contains the exception that the method being invoked has
113 * thrown (after the invocation returns).
114 *
115 *
116 * @return the <code>Environment</code> object for this request
117 */
119 public abstract Environment env();
121 /**
122 * Retrieves the <code>ExceptionList</code> object for this request.
123 * This list contains <code>TypeCode</code> objects describing the
124 * exceptions that may be thrown by the method being invoked.
125 *
126 * @return the <code>ExceptionList</code> object describing the exceptions
127 * that may be thrown by the method being invoked
128 */
130 public abstract ExceptionList exceptions();
132 /**
133 * Retrieves the <code>ContextList</code> object for this request.
134 * This list contains context <code>String</code>s that need to
135 * be resolved and sent with the invocation.
136 *
137 *
138 * @return the list of context strings whose values
139 * need to be resolved and sent with the
140 * invocation.
141 */
143 public abstract ContextList contexts();
145 /**
146 * Retrieves the <code>Context</code> object for this request.
147 * This is a list of properties giving information about the
148 * client, the environment, or the circumstances of this request.
149 *
150 * @return the <code>Context</code> object that is to be used
151 * to resolve any context strings whose
152 * values need to be sent with the invocation
153 */
155 public abstract Context ctx();
157 /**
158 * Sets this request's <code>Context</code> object to the one given.
159 *
160 * @param c the new <code>Context</code> object to be used for
161 * resolving context strings
162 */
164 public abstract void ctx(Context c);
167 /**
168 * Creates an input argument and adds it to this <code>Request</code>
169 * object.
170 *
171 * @return an <code>Any</code> object that contains the
172 * value and typecode for the input argument added
173 */
175 public abstract Any add_in_arg();
177 /**
178 * Creates an input argument with the given name and adds it to
179 * this <code>Request</code> object.
180 *
181 * @param name the name of the argument being added
182 * @return an <code>Any</code> object that contains the
183 * value and typecode for the input argument added
184 */
186 public abstract Any add_named_in_arg(String name);
188 /**
189 * Adds an input/output argument to this <code>Request</code> object.
190 *
191 * @return an <code>Any</code> object that contains the
192 * value and typecode for the input/output argument added
193 */
195 public abstract Any add_inout_arg();
197 /**
198 * Adds an input/output argument with the given name to this
199 * <code>Request</code> object.
200 *
201 * @param name the name of the argument being added
202 * @return an <code>Any</code> object that contains the
203 * value and typecode for the input/output argument added
204 */
206 public abstract Any add_named_inout_arg(String name);
209 /**
210 * Adds an output argument to this <code>Request</code> object.
211 *
212 * @return an <code>Any</code> object that contains the
213 * value and typecode for the output argument added
214 */
216 public abstract Any add_out_arg();
218 /**
219 * Adds an output argument with the given name to this
220 * <code>Request</code> object.
221 *
222 * @param name the name of the argument being added
223 * @return an <code>Any</code> object that contains the
224 * value and typecode for the output argument added
225 */
227 public abstract Any add_named_out_arg(String name);
229 /**
230 * Sets the typecode for the return
231 * value of the method.
232 *
233 * @param tc the <code>TypeCode</code> object containing type information
234 * for the return value
235 */
237 public abstract void set_return_type(TypeCode tc);
239 /**
240 * Returns the <code>Any</code> object that contains the value for the
241 * result of the method.
242 *
243 * @return an <code>Any</code> object containing the value and
244 * typecode for the return value
245 */
247 public abstract Any return_value();
249 /**
250 * Makes a synchronous invocation using the
251 * information in the <code>Request</code> object. Exception information is
252 * placed into the <code>Request</code> object's environment object.
253 */
255 public abstract void invoke();
257 /**
258 * Makes a oneway invocation on the
259 * request. In other words, it does not expect or wait for a
260 * response. Note that this can be used even if the operation was
261 * not declared as oneway in the IDL declaration. No response or
262 * exception information is returned.
263 */
265 public abstract void send_oneway();
267 /**
268 * Makes an asynchronous invocation on
269 * the request. In other words, it does not wait for a response before it
270 * returns to the user. The user can then later use the methods
271 * <code>poll_response</code> and <code>get_response</code> to get
272 * the result or exception information for the invocation.
273 */
275 public abstract void send_deferred();
277 /**
278 * Allows the user to determine
279 * whether a response has been received for the invocation triggered
280 * earlier with the <code>send_deferred</code> method.
281 *
282 * @return <code>true</code> if the method response has
283 * been received; <code>false</code> otherwise
284 */
286 public abstract boolean poll_response();
288 /**
289 * Allows the user to access the
290 * response for the invocation triggered earlier with the
291 * <code>send_deferred</code> method.
292 *
293 * @exception WrongTransaction if the method <code>get_response</code> was invoked
294 * from a different transaction's scope than the one from which the
295 * request was originally sent. See the OMG Transaction Service specification
296 * for details.
297 */
299 public abstract void get_response() throws WrongTransaction;
301 };
