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Ethernet is a layer 2 protocol for transmitting frames The Ethernet standard encompasses four types: Ethernet II, IEEE 8023, Sub-Network Access Protocol, and Novell Raw I recommend the networking books mentioned in the Preface and 13, or Section 4 of the compdcomlansethernet FAQ at http://wwwnetworkuptimecom/faqs/ethernet/ for a thorough discussion of each type In this appendix I ignore the Novell Raw format because I hardly ever encounter it, and it is well documented in the references Not shown but present in every Ethernet frame is a 7-byte preamble of alternating 0s and 1s This sequence allows the receiving Ethernet NIC to synchronize with the beginning of the frame An eighth byte consisting of the sequence 10101011 is called the start frame delimiter, which indicates that a frame follows These 8 bytes are typically not shown in open source protocol analyzers Furthermore, each frame ends with a 4-byte frame check sequence (FCS), also not displayed by most protocol analyzers Throughout the book I advocate a capture snaplen value of 1,514 bytes This applies to the destination media access control (MAC) address through the last possible byte of data Such a snaplen value will not capture the FCS, although many protocol analyzers won't see it anyway The minimum length for an Ethernet frame is 64 bytes Figure A1 shows an Ethereal screen capture of a sample Ethernet II frame, which in this case is carrying an ARP request The 14 bytes of the Ethernet frame are highlighted

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Here we ve assigned the value "Michael" to the variable first_name and then interpolated it into the string "#{first_name} Hartl" We could also assign both strings a variable name:

>> => >> => >> => >> => first_name = "Michael" "Michael" last_name = "Hartl" "Hartl" first_name + " " + last_name "Michael Hartl" "#{first_name} #{last_name}" "Michael Hartl"

//create a scroll pane JScrollPane sp = new JScrollPane(); jpadd(sp); //add the pane to the layout Vector dlist = new Vector(); //create a Vector dlistaddElement("Anchovies"); //and add data dlistaddElement("Bananas"); dlistaddElement("Cilantro"); dlistaddElement("Doughnuts"); dlistaddElement("Escarole"); JList list = new JList(dlist); //create a list with data spgetViewport()add(list); //add the list to the Jscrollpane

With this spec helper in hand, the test for signout is straightforward: sign in as a (factory) user and then hit the destroy action and verify that the user gets signed out (Listing 920)

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Listing 920 A test for destroying a session (user signout)

You can set the JList to allow users to select a single line, multiple contiguous lines, or separated multiple lines by using the setSelectionModemethod, where the arguments can be

describe SessionsController do describe "DELETE 'destroy'" do it "should sign a user out" do test_sign_in(Factory(:user)) delete :destroy controllershould_not be_signed_in responseshould redirect_to(root_path) end end end

Dst MAC Adr (6 bytes): Destination MAC address Src MAC Adr (6 bytes): Source MAC address Typ (2 bytes): EtherType, defining the next protocol to be found in the frame Common values are 0x0800 for IP and 0x0806 for ARP

The only novel element here is the delete method, which issues an HTTP DELETE request (in analogy with the get and post methods seen in previous tests), as required by the REST conventions (Table 91) As with user signin, which relied on the sign_in function, user signout just defers the hard work to a sign_out function (Listing 921)

You can then receive these events by using the addListSelectionListener method Your program must implement the following method from the ListSelectionListener interface:

Listing 921 Destroying a session (user signout)

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class SessionsController < ApplicationController def destroy sign_out redirect_to root_path end end

public void valueChanged(ListSelectionEvent e)

ARP is a protocol used to associate IP addresses with MAC addresses Figure A2 shows an ARP request and Figure A3 shows an ARP reply

As with the other authentication elements, we ll put sign_out in the Sessions helper module (Listing 922)

module SessionsHelper def sign_in(user) cookiespermanentsigned[:remember_token] = [userid, usersalt] current_user = user end def sign_out cookiesdelete(:remember_token) current_user = nil end private end

In the following example, we display the selected list item in a text field:

As you can see, the sign_out method effectively undoes the sign_in method by deleting the remember token and by setting the current user to nil11

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In principle, we are now done with authentication, but as currently constructed there are no links to the signin or signout actions Moreover, newly registered users might be confused, as they are not signed in by default We ll fix the second problem first, starting with testing that a new user is automatically signed in (Listing 923)

public void valueChanged(ListSelectionEvent e) { textsetText((String)listgetSelectedValue());

11 You can learn about things like cookiesdelete by reading the cookies entry in the Rails API (Since Rails API links tend to go stale quickly, use your Google-fu to find a current version)

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render_views describe "POST 'create'" do describe "success" do it "should sign the user in" do post :create, :user => @attr controllershould be_signed_in end end end end

For a list to change dynamically while your program is running, the problem is somewhat more involved because the JList displays the data that it is initially loaded with and does not update the display unless you tell it to One simple way to accomplish this is to use the setListData method of JList to keep passing it a new version of the updated Vector after you change it In the JListDemojava program, the contents of the top text field are added to the list each time that the Add button is clicked All of this place in the action routine for that button

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