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These dependencies tend to grow exponentially with the complexity of the system, and managing them can become unwieldy. If you are working on a medium to large size application, consider centralizing configuration-related code using the J2EE Service Locator pattern. You can use this technique to remove complexity from individual components and centralize access to your configuration data. If you are unfamiliar with the Service Locator design pattern, refer to appendix A for more information. An example of this strategy is the use of a JNDI Service Locator component. This component could be a local Session bean that contains all the JNDI configuration data and mappings in its deployment descriptor. Your other components can query this bean via a local interface to obtain handles to data sources, message queues, and other beans using application-wide identifiers or class references. For example, an EJB might be found by passing its class to the Service Locator. A message queue might be found by passing in a global name that the Service Locator has mapped to a JMS queue configured in its deployment descriptor. This approach can be quite useful in systems consisting of more than a handful of components, or in an environment where multiple external resources must be accessed throughout the application.

Figure 30-4 On the General tab, type a name for your new task and indicate whose security context it should run in.

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The circumstance under which you re most likely to need to change the security context is if you re setting up tasks to run on another computer. If you intend to run programs with which another user can interact, you should run those in the other user s security context. If you run them in your own, the tasks will run noninteractively (that is, the user will not see them). Regardless of which user s security context the task is to run in , you have the option of allowing the task to run whether or not that user is logged on. If you select Run Whether User Is Logged On Or Not, you will be prompted for the user s password when you finish creating the task. If you don t happen to have that password, you can select Do Not Store Password. As the text beside this check box indicates, the task will have access to local resources only.

If the task you re setting up is one that would generate a UAC prompt if run interactively, you ll want to select Run With Highest Privileges. Because you ve already dealt with a UAC prompt when you launched Task Scheduler, you won t have to supply any additional credentials or answer any further prompts when you create the task. When your task runs, it will run with administrative privileges.

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These sections of the infrastructure (which are not necessarily individual servers or server racks) are designed in such a way that a failure of one fault domain is extremely unlikely to affect any other fault domain When you deploy a service, the Windows Azure Fabric Controller automatically locates the roles in at least two different fault domains so that a failure in one domain will not affect all instances of your service Note: There is no guarantee that your role instances will be located in more than two fault domains, so there is no point in deploying more than two instances of a role unless this is necessary to meet the load anticipated for your service or for other operational reasons.

Windows XP Service Pack 2 introduced the ability to create hidden tasks tasks that did not ordinarily appear in the Windows XP Scheduled Tasks folder. Such tasks could be created only by means of a programming API. In Windows Vista, you can create such tasks without using the API, by selecting the Hidden check box. Presumably the reason to do this would be make tasks that you set up for other users less visible (hence less subject to alteration or deletion) on their target machines. Note, however, that anyone who has the administrative credentials required to run Task Scheduler can make hidden tasks visible by choosing View, Show Hidden Tasks. And anyone running Task Scheduler can alter or delete tasks at will, regardless of who created them.

Summary

If you re setting up a task on a remote computer that s running an operating system other than Windows Vista, open the Configure For drop-down list and choose appropriately. As of this writing, the Windows Vista Task Scheduler can configure tasks for Windows Server 2003, Windows XP, or Windows 2000, in addition to Windows Vista.

Tasks can be triggered in the following ways:

On a schedule At logon At startup On idle On an event At task creation or modification On connection to a user session On disconnect from a user session On workstation lock On workstation unlock

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