The domain manager in Visual Studio .NET

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16.3.2 The domain manager
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As I mentioned earlier, in the future an architecture based upon domain management will be used as a replacement to the current scheme based around the shutdown server.
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16.3.2.1 Overview
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This alternative scheme is based on the concept of power domains, which may be populated with applications, and which are organized as dependency trees that represent the domain hierarchy (see Figure 16.5). Each node on the dependency tree represents a domain and is identi ed by a domain ID an identi er number. Applications at the top of the tree, residing in parent domains, will usually provide services to those in child domains, or will manage the resources that they need to use. In this way
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Application (system) Root App1 App2 Domain 0 (root domain) Domain 1 App3 App4 App5 Domain 1 App6 App7 Domain 2 Domain
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Domain 2
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Domain 3 App8 App9 Domain 3 App10 Domain 4 App11 App12 Domain 5
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Domain 4
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Application dependencies and the domain hierarchy
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the applications on one node of the domain tree have a dependency on the node above, and so on. This dependency is taken into consideration when a domain is activated, put into standby or shutdown. Domains can be in one of three possible power states: active, standby or off. Domains can be independently requested to transition between these different power states. If a transition is applied to the root domain (the top of the tree) then the transition is a system transition. A system transition is one that is also applied to the kernel via the Power API, once the root domain has completed its transition. The system can transition from the active to the standby or off states this is, of course, shutdown. The transition to active state is only allowed from the standby state and cannot be initiated by a call to the domain manager. This transition starts when the kernel wakes up from its standby state and reports the wakeup event to the domain manager, which then recovers from standby state by transitioning the domain tree back to active. The transition of a domain to standby or off always starts with the transition of all the domain s child domains, followed by the transition of the target domain itself. A domain transition to the active state always starts with the transition of that domain, followed by the transition of its entire list of child domains. Domain trees are static and are speci ed at system build time in the domain policy DLL. At system startup time, when the domain tree is loaded from this DLL, domains in the tree have no member applications. Applications will join the relevant domain as they startup. We permit a maximum of 256 domains. Applications are allowed to join domains, or disconnect from them, at any time. Once an application has joined a domain, it will remain a member of that domain until it explicitly relinquishes membership. Membership of a domain gives an application the ability to request noti cation of the domain s power state changes. The application can
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decide on what action it should take on receiving this noti cation. Usually, on receiving a noti cation for a transition to a low power state, an application will save data related to its current state. Domain state change noti cation is implemented using the publish and subscribe mechanism that I discussed in 4, Inter-thread Communication. State changes are published as property value changes. A state property identi er a UID has been reserved for this purpose, as have 256 sub-keys for the maximum possible number of domains. Applications that want to receive domain state noti cation simply subscribe to the state property. Applications can join more than one domain and be noti ed of power state changes affecting all the different domains that they belong to. Applications may act upon the noti cation differently for each of the different domains they belong to, or for each type of state change they are noti ed about. For example, an application may save its data and state to persistent storage on domain shutdown, or save it to RAM on domain standby.
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