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Related Concepts, Technologies, and Patterns The lifecycle of session objects and CLIENT-DEPENDENT INSTANCES must be managed by LEASING to dispose of sessions that are no longer needed, because the respective client has terminated.
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There are many distribution infrastructures that are implemented on top of distributed object middleware. This section looks at prominent examples, such as transaction processing monitors, component infrastructures, peer-to-peer computing, grid computing, code mobility, and messaging. Transaction processing monitors Transaction processing monitors (TP monitors) are one of the oldest kinds of middleware. They provide the infrastructure to develop, run, and manage distributed transaction applications efficiently and reliably. For many decades, TP monitors were the dominant form of middleware, and many other middleware products available today have some link to a TP monitor product. One of the earliest TP monitors was IBM s Customer Information Control System (CICS) [Ibm04b], developed in the late 1960s and still in use today. The main purpose of TP monitors is to extend a distributed application with the concept of transactions. Transactions were developed in the context of databases, and describe a series of operations that have socalled ACID properties. ACID is an abbreviation that stands for a number of desirable properties of a transaction: Atomicity. A transaction is treated as an indivisible unit, and is entirely either completed (committed) or undone (rolled back). Consistency. When the transaction terminates, the system must be in a consistent state. Isolation. A transaction s behavior must not be affected by other transactions. Durability. Changes are permanent after a transaction successfully terminates, and these changes must survive system failures (also referred to as persistence).
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A distributed transaction involves more than one transactional resource, such as a database, and is usually located on more than one machine. Conventional RPC does not support the transactions, so RPC treats all invocations as if they are independent of each other. This makes it hard to recover from partial failure and enforce consistent, complete changes to distributed data. TP monitors, in contrast, allow developers to wrap a series of invocations as a transaction. They can thus guarantee either at most once , at least once , or exactly once semantics for an invocation. Transactional invocations are realized typically by marking the beginning and the end of a transaction in the client code. At the beginning of the transaction, the client contacts the TP monitor to acquire a transaction ID and context to be used throughout the transaction for the respective remote invocation. At the end of the transaction, the client notifies the TP monitor again, and the TP monitor then runs a commit protocol to determine the outcome of the transaction. All transactional invocations must be marked as belonging to a specific transaction by using the transaction ID. This can be done by the INVOKER and REQUESTOR/CLIENT PROXY. A more elegant way is to use interceptors: INVOCATION INTERCEPTORS allow the transaction ID to be added on the client side and read it on the server side transparently. The transaction ID can be stored in an INVOCATION CONTEXT. In a distributed transaction, a two-phase commit protocol (2PC [Gra78]) can be used for distributed transaction processing. Twophase commit guarantees the ACID properties and supports distributed synchronization of multiple transactional resources. Finally, the client is informed whether or not the transaction was successfully committed. TP monitors map the requests of numerous clients to server applications and/or backend resources. An important goal of commercial TP monitors is to improve the distributed system s performance. In addition, TP monitors include management features, such as process recovery by restarting, dynamic load balancing, and enforcing consistency of distributed data. Many TP monitors support a number of different communication interfaces to be used by clients and servers,
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24.09.2004 21:16
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