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Impact of Web Services on Transactions
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Web services use HTTP as a kind of default or always-present transport option for interoperability, meaning that all Web services specifications have to work over HTTP HTTP is a very loosely coupled transport designed to work on a wide area network (ie, the World Wide Web) Traditional transaction processing technologies were originally designed to work on a single machine and then were adapted for use within a tightly coupled local area network environment Now they are being extended with new protocols designed to meet the requirements for Web services for use in service-oriented environments over wide area networks Traditional distributed transaction processing solutions rely on a network-level feature called a persistent session or conversation to share transaction context This feature stores context information, such as a transaction ID, and associates the context with a communication session so that it can be reused for multiple message exchanges over the same session When a communications session is lost, a transaction can be safely and automatically rolled back HTTP, on the other hand, supports only a single request/response message exchange over the same session and drops the session immediately after the response is returned (or if any error occurs) When multiple operations on data are required to complete a transaction, as is typically the case (otherwise transactions aren't really needed), HTTP provides no mechanism for storing the temporary, persistent state required to execute a rollback in the case of communications or other processing failure, or to enforce a commit should the multiple operations succeed For Web services, therefore, transaction context has to be passed on every message exchange, and coordinators have to be extended to work better with asynchronous network transports Additional context management solutions are required, including a mechanism to coordinate transactions without persistent sessions at the transport level, along with the definition of new protocols on top of the context Because Web services often represent the entry point to a longrunning activity such as an automated business process, context management protocols also have to be extended specifically for that type of application When a transaction is managed entirely within a single execution environment, Web services transactions have no role to play Web services transactions are only useful when the results of more than one Web service execution need to be coordinated into a larger unit of work However, some cases exist when a Web service may or may not need to be included in a transaction started by another Web service, and it may be necessary for the Web service provider to handle a request to join a transaction For example, a self-contained transaction to book a seat on a flight doesn't need to coordinate transactional context However, when the self-contained transaction is executed within a larger transaction that also includes booking a hotel room and a rental car, the flight Web service may have to accept a transaction context and enroll in the coordinated unit of work Thus, Web services transactions need to support composable transaction models
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Because Web services map to a broad variety of software systems, it's necessary to consider the usefulness of multiple transaction protocols for different application styles and types An application consisting of Web services that are colocated (that is, running within the same address space, or close enough to each other that network latency isn't very great) and that are executed using similar software systems (ie, both in the same application server container or by a close application server container of the same type) may find benefit in using the classic two-phase commit protocol to ensure that the Web services succeed or fail as a unit An application that consists of Web services that are executed in systems far apart in the network, such that latency is a problem, or that are executed using widely different software systems, such as an application server and a message queuing system, may benefit from a protocol better adapted to extended network or application latencies Furthermore, SOA-based and BPM applications need a protocol capable of running over an extended period of time, something that the two-phase commit protocol isn't good at
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