See also Section 1446, which discusses strategies for optimizing this behavior in Software

Generation Code 3 of 9 in Software See also Section 1446, which discusses strategies for optimizing this behavior
See also Section 1446, which discusses strategies for optimizing this behavior
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If the POA name cannot be found in the server table (because the server was never registered), the target server is completely unknown to the repository In this case, the repository replies to the client with an OBJECT_NOT_EXIST exception, which is propagated up to the client application code If the POA name is known but the corresponding server is not running and does not have a registered command line for automatic start-up, the repository returns a TRANSIENT exception to the client, which is propagated up to the application code If the POA name is known and if the corresponding server is not running but has a command line registered, the repository starts the server process by executing the command It then waits for messages from the server that indicate the server's host and the port number for the POA used by the request These messages not only inform the repository of the POA's address details but also let it know that the POA is ready to accept requests
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If the server is running (possibly after being started first), the repository returns a Reply message with a reply_status of LOCATION_FORWARD to the client (see Section 1342) In the body of this reply, the repository returns another object reference to the client The repository constructs that IOR by creating a new profile body that contains the actual host and port of the server along with the original POA name and object ID The client now has a new object reference and restarts the binding process from scratch by opening a connection to the host and port indicated in the new reference's profile and sending the request a second time Because the implementation repository returned the current addressing information of the actual server, the client sends the request to the correct server on this second attempt and the request is bound to its servant as with transient references Figure 141 illustrates the sequence of interactions for a reference to the controller object, assuming that the server is registered as shown in Table 141 The diagram assumes that the implementation repository runs on machine coco at port 2133 and that the CCS server is not running when the client invokes the request The sequence of steps during binding is as follows
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Figure 141 Binding of a persistent reference via the implementation repository with automatic server start-up
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Step 1 The client invokes the find operation on the controller This results in the client-side run time opening a connection to the address found in the controller IOR, which is the address of the repository With the request, the client sends the object key (which contains the POA name and the object ID controller and C1 in this example) Step 2
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The repository uses the POA name (controller) to index into its server table and finds that the server is not running Because the POA has a registered command, the repository executes the command to start the server Step 3 The server sends messages that inform the repository of its machine name (bobo), the names of the POAs it has created and their port numbers (controller at 1799), and the fact that it is ready to accept requests Step 4 The implementation repository constructs a new object reference that contains host bobo, port number 1799, and the original object key and returns in a LOCATION_FORWARD reply Step 5 The client opens a connection to bobo at port 1799 and sends the request a second time Step 6 The server uses the POA name to locate the POA that contains the servant for the request The POA contains another table, the Active Object Map, which maps object IDs to the memory address of the corresponding C++ servant (Not all POAs have an Active Object Map; depending on the activation policy, the POA may also invoke an applicationsupplied servant manager to locate the correct servant, or the POA may dispatch the request to a default servant The point is that the object ID serves to identify the servant that handles the request) After the server has identified the servant object, it dispatches the request to the servant Step 7 The servant completes the find operation and returns its results, which are marshaled back to the client in a Reply message As you can see, indirect binding uses the implementation repository as a location broker that returns a new IOR to the client that points at the current server location The CORBA specification does not limit indirection to a single level Instead, it requires a client to always respond to a LOCATION_FORWARD reply by attempting to send another request Allowing multiple LOCATION_FORWARD replies permits more-complex repository designs, such as federated repositories, which distribute the binding load over a number of physical servers (To the best of our knowledge, no ORBs implement federated repositories at the time of writing) 1446 Binding Optimizations The indirect binding scenario we show in Section 1445 can be optimized in a number of ways depending on your ORB and whether the client holds a reference to an object in the same ORB or another vendor's ORB Note that the optimizations we outline here are not required by CORBA, so whether they are present in your ORB is vendordependent
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