.NET/Java PDF, Tiff, Barcode SDK Library

Many people have the misconception that SOAP messages must always be sent via HTTP or HTTPS, but the SOAP specification intentionally leaves the question of protocol open This means that SOAP messages can be send via TCP Simple Mail Transfer Protocol (SMTP), MSMQ, or a custom , protocol HTTP and HTTPS are still the most common way to send Web Service requests Remoting breaks the questions of how and what into two extensible layers of abstraction: channels and messages The Remoting infrastructure is specifically designed to enable someone to plug into his own channel (protocol) and provide his own message format (what s getting passed over the protocol) Remoting ships with implementations of both channels and formatters; HTTP IPC, and TCP for channels, and SOAP and binary for message formats ,.

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In an application where the chance of users updating the same row is great, the number of users that can get the Sorry, someone else is changing the record that you want to modify Please try again message can multiply rapidly Also consider what happens if someone locks a row and forgets about it or goes out for lunch Session timeouts can handle such situations, but this can still be a bottleneck The optimistic locking technique discussed next tries to address the problems just outlined..

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The philosophy of optimistic locking is to be optimistic in assuming that the underlying data won t get changed by another conflicting transaction. Optimistic locking doesn t lock any records across client requests. Instead, it introduces a mechanism by which the application can detect, during the update, whether or not the record has been modified by another transaction since the user last selected it. If indeed some other transaction has updated the same column(s) that the user was trying to update, the update affects zero rows, and the user is asked to try again. The pseudo code for performing the update looks something like this: If( underlying record has not changed since the user started editing it in UI) then Update the record Else Update should affect zero records and the user is asked to retry the operation. End if There are many ways of implementing optimistic locking, and they differ mainly in the manner in which they detect a lost update scenario. The following sections cover some of these methods. In each of the cases discussed, assume that two users are trying to update

Web Services Can be exposed directly via configuration from COM+; otherwise, expose via IIS. Remoting Component Services should be exposed to clients using Remoting via IIS when using HTTP . To use TCP a custom , listener must be created and installed as an NT Service. Deploy a configuration file specifying URL to use to reach exposed type into the root of the web application. Must use HTTP as a channel, but any formatter can be chosen. .NET includes SOAP and binary formatters. N/A DCOM and Interop A DCOM proxy can be generated, and a .NET client can use it via an interop assembly. Custom interop is used internally by COM+ to communicate between managed and unmanaged stacks. N/A

Martin s record. Assume that the UI allows the user to update the name and the salary information. In our example programs, the user actually modifies only the salary, though all the examples should work even if the user modifies the name also.

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