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4212 Stages Stages in well-behaved flow networks all obey sets of constraints that are reminiscent of those seen in electrical circuit design Here is one conservative set of composition rules that generate a small number of basic kinds of stages: Directionality Flow maintains a single directionality, from sources to sinks There are no loops or back-branches from consumers to producers This results in a directed acyclic graph (DAG) of information or object flow Interoperability Methods and message formats are standardized across components, normally through conformance to a small set of interfaces Connectivity Stages maintain fixed connectivity: consumers may receive messages only from known producers, and vice versa So, for example, while a web service may have any number of anonymous clients, a given TemperatureComparator object may be designed to receive temperature update messages only from a designated TemperatureSensor object Connectivity is usually arranged by maintaining direct references from producers to consumers or vice versa, or by having them share access to a Channel Alternatively, a network may be based on constrained use of blackboards, multicast channels, or JavaSpaces (see 416) in which producers specially tag messages destined for particular consumers Transfer protocols Every message transfers information or objects Once a stage has transferred a mutable object, it never again manipulates that object When necessary, special buffer stages may be interposed to hold elements transferred out from one stage that cannot yet be accepted by other stages Transfer protocols typically rely on the basic put and take operations described in 234 When all messages involve put-based transfers, networks are normally labeled as push flow; when they involve take-based transfers, they are normally labeled as pull flow; when they involve channels supporting both put and take (and possibly exchange), they can take various mixed forms Threads Stages may implement oneway message passing using any of the patterns described in 41, as long as every (potentially) simultaneously live connection from a given producer to a given consumer employs a different thread or thread-based message-sending construction It is rarely necessary to satisfy this requirement by issuing every message, or every stream of messages from a producer to a consumer, in a different thread You can instead exploit connectivity rules to use threads only as needed Most sources in push-based systems intrinsically employ threads Additionally, any push stage with multiple successors that may ultimately hit a Combiner stage must issue the messages independently Otherwise, if a thread is blocked at the combine point, there may be a possibility that the Combiner will never see the other inputs necessary to unblock it Sources have no predecessors. vb.net code 128 reader VB . NET Barcode Reader - How to Scan & Read Barcode in VB . NET ...
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