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A Lane is a subset inside a Pool that makes it possible to organize and categorize activities (Figure 3.36). The meaning of the Lanes is left to the discretion of the process model designer, but most of the time they are used to represent internal roles (accounting, purchaser, etc.), systems (applications of the enterprise) or organizational entities internal to the enterprise (customer services, accounting, etc.). For example a warehouse management process could comprise a Pool, represented by a Welcome Lane and a Check Lane.

Most transaction processing monitors operate in a bulletin board, or memorybased mode. Transactions that are in-flight are posted to the bulletin board until they are committed to all systems. Recovering a bulletin board system is similar to recovering a database; the log of applied transactions results in rollforwards or rollbacks to bring the transaction monitor into a state of consistency with the databases it is front-ending. A reliable queue, or transactional queue, uses disk-based transaction waiting areas to ensure that no transaction accepted by the queue is ever lost. Reliable queues that allow transactions to be inserted and processed later are known as store-and-forward queues or asynchronous queues. Examples of reliable queuing systems include the IBM/Transarc Encina RQS, IBM s MQ Series, Microsoft s MSMQ, and BEA s Tuxedo/Q and MessageQ products. There are other commercial products that perform some of the store-and-forward distribution of messages but lack strong recovery or replication features. Use the design rules and requirements in this chapter to help guide you through product selection; you may not need all of the transactional recovery if you handle corner cases in your application.

32 32

A dead man timer is a mechanism where any sign of activity from a system resets the timer. When no activity occurs, the timer counts, and when it reaches its expiration point, it acts as though the nonresponding system has failed.

32 32

18

Applications can send their transactions into the queue and then continue with other tasks, safe in the knowledge that the queue manager will forward the transactions on to their next destination. Generally, it s a bit faster to insert a transaction into a queue than into the whole database, because there s no data manipulation work involved in the queue. The transaction is copied to disk and logged, and the writing application is free to continue. The queue manager then forwards the transaction on, possibly replicating it to other queues on multiple machines, or doing the replication in-place by replaying the transaction across several machines before removing it. Queues allow transactions to be routed, merged, and distributed without impacting the application, provided the application can handle asynchronous notification of transaction completion or failure, and that the application is pipelined enough to benefit from asynchronous operation.

32 32

When talking about asynchronous queuing systems, I often point out that they work best in optimistic designs that is, in cases where you try to cover the average case instead of the oddball but serious failure mode. After I used the term in a conversation, a customer asked me, What do you mean by asynchronous but optimistic transactional systems It s a model that was popularized inside of Sun by Alfred Chuang (who went on to become the A in BEA Systems), but the examples seemed particular to Sun and computer sales operations. Here s the example I used to explain asynchronous operation: Consider how you and your spouse manage your checkbook. In a synchronous world, you would write checks together, go to the ATM together, and even balance the checkbook register together in a true fit of marital bliss. This model is impractical because it assumes you re physically together and in total agreement for every single financial transaction. In real life, you operate asynchronously; you each visit the ATM separately and write your own checks, confident that your spouse won t suddenly withdraw 99 percent of your available funds and head for Las Vegas. Your ability to handle your own slice of the financials is the asynchronous part; the assurance that most transactions don t produce exceptions is the optimistic part; the monthly discussion over who gets to sort through receipts and checks to balance the checkbook and produce the truth is the transactional part. Eventually, all assumptions are cleared and exceptions processed, and you re back running asynchronously again. Hal