Bidirectional IIOP in Software

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139 Bidirectional IIOP
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As mentioned in Section 134, CORBA 23 added GIOP 12 and IIOP 12 to enable bidirectional communication This allows client and server to reverse roles without the need to open a separate connection that may be blocked by a firewall At the time of writing, the specification is undergoing changes, and implementations are unlikely to appear before mid-1999, so we do not cover version 12 in detail in this chapter Here is a summary of the major changes GIOP 12 does not add new message types but adds extensions to most of the message headers and bodies These extensions support the additional information that must be exchanged for bidirectional communication GIOP 12 adds a LOCATE_FORWARD_PERM reply status, which is intended to ease object migration (see Section 145)
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GIOP 12 tightens the alignment restrictions for a request body to make remarshaling after a LOCATE_FORWARD reply more efficient IIOP 12 adds additional information to the service context to support bidirectional communication It also defines a policy that enables bidirectional communication only if both client and server agree to use it This policy allows administrators to disable bidirectional communication over insecure links and thereby prevent clients from masquerading as someone else's call-back object If bidirectional communication is disabled, GIOP 12 uses a separate connection for callbacks
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GIOP specifies the on-the-wire representation of data and the messages that are exchanged between clients and servers IIOP adds the specific information required for ORBs to interoperate via TCP/IP All interoperable ORBs support IIOP In addition, ORBs may support DCE-CIOP or proprietary protocols IORs contain the interface type of an object and one or more protocol profiles Each profile contains the information required by a client to send a request using a specific protocol A single IOR can contain addressing information for several protocols simultaneously This arrangement allows a single CORBA object to be reached via different transports and also provides a basic protocol hook for fault-tolerant ORBs An IIOP 11 profile can contain a number of tagged components Components encode additional information; for example, they can identify the codeset or security mechanism to be used for a request Vendors can add proprietary components to IORs to support value-added features or optimizations CORBA defines a particular component that identifies the ORB vendor and ORB version If this component is present in an IOR, clients can detect whether both client and server use the same ORB If they do, clients can take advantage of this knowledge to optimize communication with the server GIOP 12 and IIOP 12 permit clients and servers to communicate across firewalls over a single connection
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14 Implementation Repositories and Binding
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141 Overview
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This chapter presents a detailed picture of what happens beneath the covers of an ORB In particular, this chapter shows how a client establishes connections to the servers it needs to access Sections 142 to 144 discuss different modes of binding and explain the role of the implementation repository during binding and automatic server start-up Section 145 discusses the design choices available for implementation repositories and explains how these choices affect object migration as well as reliability, performance, and scalability of an ORB Sections 146 and 147 discuss the various activation modes for servers, and Section 148 concludes the chapter by discussing some of the security issues surrounding implementation repositories
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142 Binding Modes
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In 13, we discuss how clients send requests to servers and receive replies via a connection-oriented protocol such as TCP/IP, but we largely skip over the issues of how a client can establish a connection to the correct server and how a server associates incoming requests with its servant This process of opening a connection and associating an object reference with its servant is known as binding CORBA offers a large amount of flexibility in the way an ORB implements binding Different ORBs offer different options, and, in general, the design of binding algorithms has profound influence on an ORB's flexibility, performance, and scalability ORBs typically support two binding modes: direct binding and indirect binding Direct binding is supported by all ORBs Indirect binding relies on an external location broker known as an implementation repository and is an optional component of CORBA (most general-purpose ORBs have an implementation repository) The implementation repository can provide additional features, such as server migration, object migration, automatic server start-up, and load balancing The precise set of features of the implementation repository depends on the ORB vendor and the anticipated deployment environment of the ORB Both direct and indirect binding are protocol-specific In particular, the addressing information embedded in an IOR depends on the underlying transport For the remainder of this discussion, we assume that IIOP is used
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