Queued Components in .NET

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Usually, methods are called in the serviced component synchronously With queued components (QCs), you can invoke methods asynchronously QCs also work in a disconnected environment The client can run on a laptop that is disconnected from the network while the application invokes methods that are defined with a QC in a recorder The overall QC architecture is shown in Figure 1-17 The recorder writes the method calls as messages in a message queue As soon as the laptop connects to the network, the message is forwarded to the target queue With the NET Enterprise Services application, a listener reads the message from the queue, and the player invokes the method in the QC
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Figure 1-17 Queued components architecture
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QCs are discussed in 10, "Queued Components"
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Loosely Coupled Events
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The term event is used when a server component invokes a method in the client With COM applications, for the server to invoke methods in the clients, connection points are used In this case, the client registers an event sink with the server, and when the event happens, the server invokes a specified method in the sink object This is very similar to NET remoting events Both with COM and with NET, remoting clients and servers are tightly connected COM+ Services uses a loosely coupled events (LCEs) facility With a COM+ application, the COM+ facility is inserted between client and server (see Figure 1-18) The publisher (the component) registers the events it will offer by defining an event class Instead of sending the events directly to the client, the publisher sends events to the event class that is registered with the LCE service The LCE service forwards the events to the subscribers, which are the client applications that registered a subscription for the event
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Figure 1-18 Loosely coupled events
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If you use the LCE facility, the server does not have to deal with all the clients because this is done by the LCE service LCEs are discussed in 11, "Loosely Coupled Events"
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Role-Based Security
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Instead of dealing with users and user groups that are created by the system administrator, and the need to create complex programming code for using the system access control lists, you can use simple strings that represent user roles These strings are defined with a NET Enterprise Services application by the developer and just need to be unique within the application The system administrator then assigns users and user groups that belong to these roles; thereafter, the programming code only has to deal with roles In Figure 1-19, the administrative tool Component Services Explorer shows a view of three roles defined with the application CourseManagement: Managers, Normal Users, and Power Users Just by specifying configuration entries with NET attributes, you can define what user roles may access which components/interfaces/methods
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Figure 1-19 Configuration of roles
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Role-based security is discussed in 12, "Security"
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New Features with COM+ 15
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Windows XP and Windows Server 2003 both ship with COM+ 15, which offers some new features You can use these features with version 10 and 11 of the Microsoft NET Framework The following list summarizes these features: SOAP services Using SOAP services, you can access components by using NET remoting and the SOAP formatter Both stateless and stateful components are supported Windows services If you configure the COM+ application as a Windows service, it will start automatically when you boot the system You can also interact with the service by sending specific service commands Transaction isolation level The isolation level defines the degree to which one transaction must be isolated from another one As of Windows 2000, all declarative transactions use the isolation level serializable This is the safest isolation level, because it prevents updates and inserts outside of the transaction This isolation level guarantees that the data is correct, but it can affect concurrency negatively With many transactions, this high isolation level is not needed Starting with Windows XP, you can specify lower isolation levels, such as read uncommitted, read committed, or repeatable read Private components A private component can only be activated from within a COM+ application in which the component resides Such a component is not accessible to the client application Application pooling To increase scalability for single-threaded processes, multiple processes can be started with the same COM+ application Application recycling As a stability enhancement, application recycling is a new feature If a problem with the COM+ application is detected, the process is restarted You can configure recycling options in terms of the number of times the application is started, how much memory is used, the number of methods that are called, or the number of objects that are activated Services without components You can use services such as transactions and activities without creating serviced components Therefore, a simple NET application can benefit from services without going through the configuration of an Enterprise Services application To use this feature with Windows XP, Service Pack 2 is required Partitions If you need multiple configurations for the same COM+ application, you can use partitions Examples of when this can prove useful include offering multiple versions of the same application and using the same application with different configurations If you offer one application to multiple customers, you might need different configurations Partitions are only available with Windows Server 2003
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As you can understand, Windows Server 2003 offers a lot of features to enhance enterprise application stability, scalability, and maintainability Enterprise Services now is a mature platform for enterprise-level applications
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Summary
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This chapter opened with a discussion about building applications and specifically compared two-tier and multitier applications to help you understand the role of NET Enterprise Services in modern application development (including the ability to scale up and scale out) The focus then turned to the history of application services, showing how COM+ Services has evolved into the NET Enterprise Services of today You then learned a number of terms related to NET Enterprise Services and should now understand the terms applications, components, interfaces, and methods (among others) in the context of NET Enterprise Services The last part of this chapter provided an overview of the services offered with this application server technology: automatic transactions, queued components, loosely coupled events, role-based security, and new features that are available with Windows XP and Windows Server 2003
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ClickOnce deployment is only possible with Internet Explorer SOAP is an XML format that is defined here:http://wwww3org/TR/soap12-part1 The IDispatch interface is used by COM clients for late binding This interface is described in more detail in 3, "Concurrency" With attributes, the metadata of NET assemblies can be extended When the compiler detects an attribute, an attribute instance is created and stored with the metadata in the assembly If you are doing interop with native code, you still have to worry about memory leaks Activities are discussed in 3 In this scenario, with this context, suppose for a moment that a runtime environment is defined by the configuration of the Object class 2 discusses contexts in more detail
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