Discovering from a Discovery Proxy in .NET Build Code 128A in .NET Discovering from a Discovery Proxy

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Discovering from a Discovery Proxy using visual .net torender ansi/aim code 128 on web,windows application Developing with Visual Studio .NET Discovering services regis .net vs 2010 USS Code 128 tered with a Discovery Proxy follows the steps for ad hoc discovery discussed earlier. Instead of multicasting a UDP message, DiscoveryClient now needs to contact the Discovery Proxy.

Details about the discovery contract are encapsulated in the DiscoveryEndpoint class. Its constructor only takes parameters for the communication protocol details, binding, and address. Here we are configuring a discovery client to query the Discover Proxy:.

DiscoveryEndpoint proxyEnd point = new DiscoveryEndpoint( new NetTcpBinding(), new EndpointAddress(proxyAddressText.Text)); this.discoveryClient = new DiscoveryClient(proxyEndpoint);.

Example 6.24 6.4 WCF Discovery Implicit Service Discovery VS .NET Code 128 Code Set C Our coverage of WCF Discovery so far has focused on the explicit discovery of services. However, it is worth noting that WCF Discovery can also perform the same queries behind-thescenes, when you configure endpoints as DynamicEndpoint programmatically or in the configuration file.

This allows for highly dynamic, adaptive environments where virtually no location-specific details are maintained as part of code or configuration. A client endpoint, for example, can be configured to locate a service that matches on scope and contract. In the following example, we configure DynamicEndpoint to locate a service with matching contract and metadata:.

SOA PRINCIPLES & PATTERNS The consistent application of the Service Discoverability (702) principle is vital for WCF Discovery features to be succesfully applied across a service inventory, especially in regard to managed discovery. The application of Canonical Expression [715] ties directly to the definition and expression of any published service metadata. And, of course, Metadata Centralization [754] represents the effective incorporation of a service registry as a central discovery mechanism.

. <client> <endpoin .NET barcode standards 128 t kind="dynamicEndpoint" binding="basicHttpBinding" contract="ICustomerService" endpointConfiguration="dynamicEndpointConfiguration" name="dynamicCustomerEndpoint" /> </client> <standardEndpoints> <dynamicEndpoint> <standardEndpoint name="dynamicEndpointConfiguration"> <discoveryClientSettings> <findCriteria duration="00:00:05" maxResults="1"> <types> <add name="ICustomerService"/> </types> <extensions> <MyCustomMetadata> Highly Scalable </MyCustomMetadata> </extensions> </findCriteria> </discoveryClientSettings> </standardEndpoint> </dynamicEndpoint> </standardEndpoints>. Example 6.25 6: WCF Extensions With this configuration, t he service consumer can create a proxy object to the server with the following code:. ICustomerService svc = new barcode 128 for .NET ChannelFactory<ICustomerService> ("dynamicCustomerEndpoint").CreateChannel();.

Example 6.26 SUMMARY OF KEY POINTS WCF Discovery enables ad hoc and managed discovery and service address resolution together with support for the WS-Discovery industry standard. With WCF Discovery, services can announce their availability via UDP broadcasts. A Discovery Proxy can provide discoverability across subnets and DynamicEndpoint provides a programming model that abstracts the details of the discovery process.

. 6.5 WCF Extensibility The WCF platform provides built-in support for a range of distributed communication protocols, including transport and message encoding protocols using channel bindings. Available channel bindings include: protocol channel bindings that determine security, reliability and context flow settings transport channel bindings that determine the underlying transport protocol (including TCP and HTTP) message encoding bindings that determine the encoding at the wire (including text/XML, binary, and MTOM) Although these default channel bindings will cover common communication scenarios, there may be certain requirements that can only be accommodated via further customization. For this purpose, WCF provides an extensibility model with several extension points.

Before we explore the extensibility model, we first need to establish how WCF can be represented with two fundamental architectural layers.. 6.5 WCF Extensibility WCF Layers application As shown in Figure 6.1, WC F is partitioned into two main layers: the service model layer and the channel layer. The service model layer essentially provides a programming model that enables solutions to use WCF.

For example, all the information about user-defined service contracts is found in this layer. Underneath the service model layer is a shared message layer used as the transport and also known as the channel layer. The channel layer provides several communication channels and is also known as the channel stack.

Addresses and bindings defined in the service model layer provide the mechanisms used to control the channel stack. Bindings define the transport and addresses define the destinations of messages. Layered Extensibility Figure 6.

2 further expands on the layered view by illustrating how the proxy and dispatcher relate to the service model layer and represent touch points for services. You ll notice that underneath the proxy and dispatcher are the protocol and transport channel stacks. The protocol channels are used to process SOAP messages, add security, and add and remove headers, whereas the transport channels are used to send and receive messages.

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