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GIOP has restriction on client and server roles with respect to initiating and receiving messages. For the purpose of GIOP
versions 1.0 and 1.1, a client is the agent that
opens a connection (see more details in Section 15.5.1, “Connection Management,? on
page 15-47) and originates requests. Likewise, for GIOP versions 1.0 and 1.1, a server
is an agent that accepts connections and receives requests.When Bidirectional GIOP is in use for GIOP protocol version 1.2
and 1.3, either side may originate messages, as
specified in Section 15.8, “Bi-Directional GIOP,? on page 15-56.
GIOP message types are summarized in Table 15-3, which lists the message type
names, whether the message is originated by client, server, or both, and the value used to identify the message type in GIOP
message headers.
Table 15-3 GIOP Message Types and Originators
Message Type |
Originator |
Value |
GIOP Versions |
||
| Request | Client | 0 | 1.0, 1.1, 1.2, 1.3 | ||
| Request | Both | 0 | 1.2 with BiDir GIOP in use, 1.3 with BiDir GIOP in use | ||
| Reply | Server | 1 | 1.0, 1.1, 1.2, 1.3 | ||
| Reply | Both | 1 | 1.2 with BiDir GIOP in use, 1.3 with BiDir GIOP in use | ||
| CancelRequest | Client | 2 | 1.0, 1.1, 1.2, 1.3 | ||
| CancelRequest | Both | 2 | 1.2 with BiDir GIOP in use, 1.3 with BiDir GIOP in use | ||
| LocateRequest | Client | 3 | 1.0, 1.1, 1.2, 1.3 | ||
| LocateRequest | Both | 3 | 1.2 with BiDir GIOP in use, 1.3 with BiDir GIOP in use | ||
| LocateReply | Server | 4 | 1.0, 1.1, 1.2, 1.3 | ||
| LocateReply | Both | 4 | 1.2 with BiDir GIOP in use, 1.3 with BiDir GIOP in use | ||
| CloseConnection | Server | 5 | 1.0, 1.1, 1.2, 1.3 | ||
| CloseConnection | Both | 5 | 1.2, 1.3 | ||
| MessageError | Both | 6 | 1.0, 1.1, 1.2, 1.3 | ||
| Fragment | Both | 7 | 1.1, 1.2, 1.3 |