Use the cursor point-and-shoot feature and press Enter on the Target Queue field to see the Local Queue Definition. the act of waiting in a line of people, often to buy something: After an hour of queuing, a guard said it was only another two hours to the ticket booth. Doing so displays the attributes of the selected queue.Īlias Queue Definition Abend-AID - Alias Queue Definition. Enter the D line command next to a handle on the Opened Queues at Dump Time screen.Doing so displays the attributes of the queue used in the last MQ call prior to the dump. Use the cursor point-and-shoot feature and press Enter on the Queue Used in Call field on the Last WebSphere MQ Call Information screen.This means that a lack of feedback about success can be tolerated by the application as it can re-try the posting until it gets a 'success' message from the server.The Alias Queue Definition screen displays the attributes of the selected alias queue definition.Īccess this screen in one of the following ways: The idea is that conceptually one writes state rather than invoking a service, so one can write any number of times. IIRC, RESTFul services should be idempotent (the same state is achieved after any number of invocations of the same service), which is a strategy for dealing with this lack of guaranteed notification of success/failure in web service architectures. The application must be able to deal with this situation. The server can complete the service and fail to deliver a response (possibly through something outside the server going wrong). In the latter case, web services do not guarantee at-most-once semantics. Typically this will be through a reply to the request or timeout of the call. It is up to the client to validate that the service has been correctly run. ![]() It is a synchronous request/response protocol and has no guarantee of delivery built into the protocol. RESTFul API's) published by a (typically) HTTP Server. If the transaction is rolled back, Host A can assume that any effects of the message have been reversed.Ī web service is remote procedure call or other service (e.g. ![]() If the transaction is committed Host A can assume that the message has been delivered by the reliable transport medium. Note that A can post the message to the queue with the guarantee of at-most-once delivery. The application of queuing theory helps businesses improve the satisfaction of customers and employees, increase customer flow. Queuing theory assesses the arrival process, service process, customer flow and other components of the waiting experience. If B connects and collects the message before the transaction is rolled back, the rollback will also reverse the effects of the message on B. Queuing theory is the mathematical study of the formation and function of waiting lines. If the transaction was rolled back, this probably doesn't matter. A queue possesses the following characteristics: arrival rate. Definition 1.2 (Characteristics of Queues). In this case B will never be aware the message even existed unless informed through some other medium. There are several defining characteristics of a queue. ![]() This means that a message is guaranteed to be delivered with at-most-once semantics or guaranteed delivery if not rolled back. Examples of such systems are MSMQ and IBM MQĪ Transactional Queue can also participate in a distributed transaction, and a rollback can trigger the disposal of messages. ![]() This means that it must also be capable of persisting the message somewhere. A transactional queue is a middleware system that asynchronously routes messages of one sort of another between hosts that may or may not be connected at any given time.
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