1interceptors(3) Erlang Module Definition interceptors(3)
2
6 interceptors - Describe the functions which must be exported by any
7 supplied Orber native interceptor.
8
10 This module contains the mandatory functions for user supplied native
11 interceptors and their intended behavior. See also the User's Guide.
12 Warning:
14 Using Interceptors may reduce the through-put significantly if the sup‐
15 plied interceptors invoke expensive operations. Hence, one should
16 always supply interceptors which cause as little overhead as possible.
17 Warning:
20 It is possible to alter the Data, Bin and Args parameter for the
21 in_reply and out_reply, in_reply_encoded, in_request_encoded,
22 out_reply_encoded and out_request_encoded, in_request and out_request
23 respectively. But, if it is done incorrectly, the consequences can be
24 serious.
25 Note:
28 The Extra parameter is set to 'undefined' by Orber when calling the
29 first interceptor and may be set to any Erlang term. If an interceptor
30 change this parameter it will be passed on to the next interceptor in
31 the list uninterpreted.
32 Note:
35 The Ref parameter is set to 'undefined' by Orber when calling
36 new_in_connection or new_out_connection using the first interceptor.
37 The user supplied interceptor may set NewRef to any Erlang term. If an
38 interceptor change this parameter it will be passed on to the next
39 interceptor in the list uninterpreted.
40
43 new_in_connection(Ref, PeerHost, PeerPort) -> NewRef
44 new_in_connection(Ref, PeerHost, PeerPort, SocketHost, SocketPort) ->
45 NewRef
46 Types:
48 Ref = term() | undefined
50 PeerHost = SocketHost = string(), e.g., "myHost@myServer" or
51 "192.0.0.10"
52 PeerPort = SocketPort = integer()
53 NewRef = term() | {'EXIT', Reason}
54 When a new connection is requested by a client side ORB this
56 operation is invoked. If more than one interceptor is supplied,
57 e.g., {native, ['myInterceptor1', 'myInterceptor2']}, the return
58 value from 'myInterceptor1' is passed to 'myInterceptor2' as
59 Ref. Initially, Orber uses the atom 'undefined' as Ref parameter
60 when calling the first interceptor. The return value from the
61 last interceptor, in the example above 'myInterceptor2', is
62 passed to all other functions exported by the interceptors.
63 Hence, the Ref parameter can, for example, be used as a unique
64 identifier to mnesia or ets where information/restrictions for
65 this connection is stored.
66 The PeerHost and PeerPort variables supplied data of the client
68 ORB which requested a new connection. SocketHost and SocketPort
69 are the local interface and port the client connected to.
70 If, for some reason, we do not allow the client ORB to connect
72 simply invoke exit(Reason).
73 new_out_connection(Ref, PeerHost, PeerPort) -> NewRef
75 new_out_connection(Ref, PeerHost, PeerPort, SocketHost, SocketPort) ->
76 NewRef
77 Types:
79 Ref = term() | undefined
81 PeerHost = SocketHost = string(), e.g., "myHost@myServer" or
82 "192.0.0.10"
83 PeerPort = SocketPort = integer()
84 NewRef = term() | {'EXIT', Reason}
85 When a new connection is set up this function is invoked.
87 Behaves just like new_in_connection; the only difference is that
88 the PeerHost and PeerPort variables identifies the target ORB's
89 bootstrap data and SocketHost and SocketPort are the local
90 interface and port the client ORB connected via.
91 closed_in_connection(Ref) -> NewRef
93 Types:
95 Ref = term()
97 NewRef = term()
98 When an existing connection is terminated this operation is
100 invoked. The main purpose of this function is to make it possi‐
101 ble for a user to clean up all data associated with the associ‐
102 ated connection.
103 The input parameter Ref is the return value from new_in_connec‐
105 tion/3.
106 closed_out_connection(Ref) -> NewRef
108 Types:
110 Ref = term()
112 NewRef = term()
113 When an existing connection is terminated this operation is
115 invoked. The main purpose of this function is to make it possi‐
116 ble for a user to clean up all data associated with the associ‐
117 ated connection.
118 The input parameter Ref is the return value from new_out_connec‐
120 tion/3.
121 in_reply(Ref, Obj, Ctx, Op, Data, Extra) -> Reply
123 Types:
125 Ref = term()
127 Obj = #objref
128 Ctx = [#'IOP_ServiceContext'{}]
129 Op = atom()
130 Data = [Result, OutParameter1, ..., OutPramaterN]
131 Reply = {NewData, NewExtra}
132 When replies are delivered from the server side ORB to the
134 client side ORB this operation is invoked. The Data parameter is
135 a list in which the first element is the return value value from
136 the target object and the rest is a all parameters defined as
137 out or inout in the IDL-specification.
138 in_reply_encoded(Ref, Obj, Ctx, Op, Bin, Extra) -> Reply
140 Types:
142 Ref = term()
144 Obj = #objref
145 Ctx = [#'IOP_ServiceContext'{}]
146 Op = atom()
147 Bin = #binary
148 Reply = {NewBin, NewExtra}
149 When replies are delivered from the server side ORB to the
151 client side ORB this operation is invoked. The Bin parameter is
152 the reply body still uncoded.
153 in_request(Ref, Obj, Ctx, Op, Args, Extra) -> Reply
155 Types:
157 Ref = term()
159 Obj = #objref
160 Ctx = [#'IOP_ServiceContext'{}]
161 Op = atom()
162 Args = [Argument] - defined in the IDL-specification
163 Reply = {NewArgs, NewExtra}
164 When a new request arrives at the server side ORB this operation
166 is invoked.
167 in_request_encoded(Ref, Obj, Ctx, Op, Bin, Extra) -> Reply
169 Types:
171 Ref = term()
173 Obj = #objref
174 Ctx = [#'IOP_ServiceContext'{}]
175 Op = atom()
176 Bin = #binary
177 Reply = {NewBin, NewExtra}
178 When a new request arrives at the server side ORB this operation
180 is invoked before decoding the request body.
181 out_reply(Ref, Obj, Ctx, Op, Data, Extra) -> Reply
183 Types:
185 Ref = term()
187 Obj = #objref
188 Ctx = [#'IOP_ServiceContext'{}]
189 Op = atom()
190 Data = [Result, OutParameter1, ..., OutPramaterN]
191 Reply = {NewData, NewExtra}
192 After the target object have been invoked this operation is
194 invoked with the result. The Data parameter is a list in which
195 the first element is the return value value from the target
196 object and the rest is a all parameters defined as out or inout
197 in the IDL-specification.
198 out_reply_encoded(Ref, Obj, Ctx, Op, Bin, Extra) -> Reply
200 Types:
202 Ref = term()
204 Obj = #objref
205 Ctx = [#'IOP_ServiceContext'{}]
206 Op = atom()
207 Bin = #binary
208 Reply = {NewBin, NewExtra}
209 This operation is similar to out_reply; the only difference is
211 that the reply body have been encoded.
212 out_request(Ref, Obj, Ctx, Op, Args, Extra) -> Reply
214 Types:
216 Ref = term()
218 Obj = #objref
219 Ctx = [#'IOP_ServiceContext'{}]
220 Op = atom()
221 Args = [Argument] - defined in the IDL-specification
222 Reply = {NewArgs, NewExtra}
223 Before a request is sent to the server side ORB, out_request is
225 invoked.
226 out_request_encoded(Ref, Obj, Ctx, Op, Bin, Extra) -> Reply
228 Types:
230 Ref = term()
232 Obj = #objref
233 Ctx = [#'IOP_ServiceContext'{}]
234 Op = atom()
235 Bin = #binary
236 Reply = {NewBin, NewExtra}
237 This operation is similar to out_request; the only difference is
239 that the request body have been encoded.
240Ericsson AB orber 3.8.4 interceptors(3)