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To register a remote CAO, you use an <activated> tag nested in the <client> tag. All the CAOs used by this client application use the URL defined as an attribute of the <client> tag. (This URL is ignored by remote SAOs.) Here s an example of a client-side config uration file that defines a remote CAO:
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<client url="http://localhost:50000 > <!-- Define a remote CAO --> <activated type="RemoteComponents.Calculator, RemoteComponents /> </client>
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The <customErrors> Tag
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Unlike the tags you ve seen so far, which were nested in the <application> block, the <customErrors> tag appears in the <system.runtime.remoting> section. The mode attribute of this tag specifies whether clients received filtered exception information. Filtered exception information includes neither the exact exception type nor stack details about where the exception was thrown. If the mode attribute is equal to remoteOnly (the default), only clients from the local computer receive complete exception information. Other valid values for the mode attribute are on (all callers receive filtered error information) and off (all callers receive complete, unfiltered error information). You typically use the on setting only if you re debugging your application from a remote computer, whereas you should use remo teOnly or on settings in production applications.
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<configuration> <system.runtime.remoting> <application> </application> <!-- Prevent all clients from seeing details about exceptions. --> <customErrors mode="on /> </system.runtime.remoting> </configuration>
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A host application can determine whether the client is about to receive regular or fil tered error information by querying the CustomErrorsEnabled shared method of the RemotingConfiguration class:
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Pass True if the client is running on the same computer. If RemotingConfiguration.CustomErrorsEnabled(False) Then Remote clients receive filtered error information. End If
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The Microsoft .NET Framework Configuration Tool
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You can view and edit some of the settings in the configuration file by means of the Microsoft .NET Framework Configuration tool, which you can reach from the Admin istrative Tools menu.
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Part VII:
Advanced Topics
Before you can edit the remoting settings of an application with this tool, you must add the application to the list of configured applications. You can do this by right-clicking on the Applications element and choosing the Add command. You can configure both host and client applications. (See left portion of Figure 32-5.)
Figure 32-5
The .NET Framework Configuration tool
Next you click on the View Remoting Services Properties link in the right pane to open a dialog box that lets you set both client settings (on the Remote Applications tab) and server settings (on the Exposed Types tab).
Object Lifetime
All remotable architectures must implement a mechanism to detect when a remote object should be released. For example, DCOM uses distributed reference counting: the object is released only when all the references held in remote clients are set to Nothing. However, DCOM must also account for possible system and network failures, by having clients periodically ping the server to say I am alive. If the server doesn t receive a ping from a client in a given timeout, it assumes that the client has crashed or is unreachable, and consequently decreases the reference counter of all the objects the client has a reference to. The DCOM pinging mechanism suffers from performance and scalability problems, as well as other issues. For example, this mechanism doesn t work well with firewalls and proxies, which makes DCOM unfit for Internet scenarios. For these and other reasons, the developers at Microsoft opted for a different solution when they came up with a remoting infrastructure for the .NET Framework. .NET
remoting manages the lifetime of remote objects via a lease-based mechanism. When the object is created, it is assigned a lease object. The initial lease time is 5 minutes, but you can change this default value in a number of ways. Each time the object receives a remote call, the lease time is extended, if necessary, by a configurable time value. (The default is 2 minutes.) Each AppDomain has a lease manager object that checks whether the lease time of each object has expired, and if so, it releases the object. (By default, this check occurs every 10 seconds, but this value can be configured.) Before releasing the object whose lease has expired, the lease manager checks whether the server or client application has registered a sponsor for that specific object. If a sponsor does exist, the .NET remoting infrastructure tries to contact the sponsor (via remoting, if the sponsor doesn t reside on the server machine) and asks it whether the lease period should be renewed. If the sponsor fails to respond within a given timeout (the default is 2 minutes), the lease manager assumes that the sponsor isn t working or reachable and proceeds to release the object. The lease mechanism doesn t apply to single-call SAOs. These objects live for the dura tion of one method call and don t have any lease objects associated with them. Singleton SAOs are subject to the lease mechanism, but in most cases, you can use the default lease time. If a singleton SAO is released by the remoting infrastructure because its lease has expired, client applications don t receive any error when they later invoke a method of the object, because .NET transparently creates a new instance behind the scenes. However, if the singleton object is used to share data among clients, you might want to associate it with a lease object that never expires. (In this case, the object will live as long as its host application.) The lease mechanism is quite critical with client-activated objects. As a matter of fact, many of the techniques I demonstrate in the following sections make sense only if applied to CAOs.
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