Implementing a Custom Peer Re solver in .NET framework

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Implementing a Custom Peer Re solver
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To create a new peer resolver, you must inherit from the abstract base This class has a number of methods on it that allow a class client to register, update, and unregister a client from a mesh network It also has a method to resolve other members of the mesh Listing 127 shows class and the con guration classes associated with it the
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Listing 127
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12: Peer Networking
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Listing 127 continued
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Implementing a Custom Peer Re solver
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12: Peer Networking
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Listing 127 continued
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Limiting the Number of Hops for a Message
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Peer networks based on message ooding typically provide a way to limit the distance a message travels with the network The distance a message travels is often referred to as the number of hops it makes when traveling on the network The number of hops is determined by counting the number of times a message is sent between neighbors For those familiar with socket programming, this is similar to the Time-to-Live (TTL) setting on the TCP protocol, which speci es the maximum number of routers a packet can traverse before being discarded Figure 127 illustrates this point by representing nodes that are connected Four nodes are labeled A, B, C, and D A message sent by Node A will make three hops to be received by Node D The number of hops can be signi cant when working with Internet-scale meshes We look for ways to limit the number of hops when we encounter these situations
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Limiting the Number of Hops for a Me ssage
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Figure 127 Number of hops across connected nodes
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WCF provides a very simple mechanism using message contracts to limit the number of hops a message passes through in a peer mesh Listing message contract for sending a request for 128 shows the a distributed search One of the members of the contract is attributed with attribute The attribute can be associated the with an integer value This value is decremented each time the message is sent to a different node The message will not be passed to any neighboring nodes when the message has passed through enough nodes to decrement the count to zero A hop count essentially puts a stop condition on the number of nodes the message can travel through In our case the number of hops is set to 3
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Listing 128 Message Contract Using
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12: Peer Networking
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Listing 128 continued
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Collaboration Using Windows Vista
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WCF provides the infrastructure for creating peer applications that can communicate across a mesh network It does not provide capabilities for discovery and ad-hoc collaboration For these we will rely on some new capabilities built in to Windows Vista and into the NET Framework 35 These include People Near Me, Windows Contacts, and Invitations This section examines these features and demonstrates how to use them using namespace the classes found in the new
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People Near Me Windows Vista provides a capability to discover other people connected to the same local subnet and invite them to collaborate This feature is available only in Windows Vista and is not available with Windows XP People Near Me can be con gured using the Control Panel or the associated tray application Figure 128 shows the People Near Me Control Panel The People Near Me Control Panel is also accessible from the system tray
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Figure 128 People Near Me Control Panel
The control panel allows you to con gure your presence information, such as your name and picture It also allows you to con gure how you would like to collaborate with other people by specifying who can send you invitations By default, anyone is allowed to send an invitation, but it can be con gured to allow only trusted contacts or to disable invitations altogether Figure 129 shows the available options for con guring who is allowed to send invitations
12: Peer Networking
Figure 129 Allow invitations
Windows Contacts You can use Windows Vista to keep track of your contacts using a new feature called Windows Contacts Windows Contacts is a central place to store your contact list Figure 1210 shows the Windows Contacts folder, which shows a list of contacts