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Now that new users can sign up for our site ( 8), it s time to give registered users the ability to sign in and sign out This will allow us to add customizations based on signin status and depending on the identity of the current user For example, in this chapter we ll update the site header with signin/signout links and a profile link; in 11, we ll use the identity of a signed-in user to create microposts associated with that user, and in 12 we ll allow the current user to follow other users of the application (thereby receiving a feed of their microposts) Having users sign in will also allow us to implement a security model, restricting access to particular pages based on the identity of the signed-in user For instance, as we ll see in 10, only signed-in users will be able to access the page used to edit user information The signin system will also make possible special privileges for administrative users, such as the ability (also in 10) to delete users from the database As in previous chapters, we ll do our work on a topic branch and merge in the changes at the end:

external source by driving the microcontroller s reset pin to its active state This provides an out-of-band reset that can be generated without cycling power After a POR, the boot loader immediately transfers control to the runtime environment s initialization code, and the normal boot process continues In the event of an external reset, the bootstrap loader waits to receive a speci c data pattern11 on the microcontroller s default serial port (also known as serial0 ) It uses the rst character of the pattern to determine the serial data rate If the correct sequence is received, the loader enters a small command shell and awaits further instructions over the serial port Once in the loader shell, the attached serial device, typically a PC or workstation, can reload any or all of the contents of the ash memory The bootstrap loader will only wait for the data sequence for three seconds before continuing normal system startup The next chapter will discuss the speci cs of interacting with the bootstrap loader for the purposes of loading the runtime environment

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A session is a semi-permanent connection between two computers, such as a client computer running a web browser and a server running Rails There are several different models for session behavior common on the web: forgetting the session on browser close, using an optional remember me checkbox for persistent sessions, and remembering sessions 325

Notice that we're not bridging to the person_role table for reviews as we do for movies That's because the XML itself (as described in 5) doesn't include a role attribute for the person element, and it doesn't really need to During decomposition, we won't know from the XML instance which role this particular person played in the film being reviewed, but we don't really need to know During XML decomposition, when you see the following:

until the user explicitly signs out1 We ll opt for the final of these options: when users sign in, we will remember their signin status forever ,2 clearing the session only when the user explicitly signs out It s convenient to model sessions as a RESTful resource: we ll have a signin page for new sessions, signing in will create a session, and signing out will destroy it We will therefore need a Sessions controller with new, create, and destroy actions Unlike the case of the Users controller, which uses a database back-end (via the User model) to persist data, the Sessions controller will use a cookie, which is a small piece of text placed on the user s browser Much of the work involved in signin comes from building this cookie-based authentication machinery In this section and the next, we ll prepare for this work by constructing a Sessions controller, a signin form, and the relevant controller actions (Much of this work parallels user signup from 8) We ll then complete user signin with the necessary cookie-manipulation code in Section 93

After the bootstrap loader transfers control to the runtime environment, a set of initialization routines is executed The following tasks are performed during the initialization phase Heap integrity check File system integrity check Device driver initialization Create initial processes

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