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The PushButton class implements the ExternalInterruptEventListener interface and must provide an implementation of the externalInterruptEvent method Every time an interrupt occurs, this method is invoked and it increments and displays the number of interrupts that have occurred since the listener was added After adding itself as a listener for external interrupts, the primordial thread itself has nothing left to do So it puts itself to sleep for a practically in nite amount of time This is roughly equivalent to invoking Threadsuspend, but it avoids using a deprecated method We need to sleep forever as opposed to just exiting the main method because the noti er thread is a daemon thread and will exit when the last user thread exits In this example, the only user thread is the primordial thread If it exits, the application will terminate almost immediately after starting Every time the push button is depressed, the externalInterruptEvent method is invoked by the daemon noti er thread and the event count is incremented and displayed This is the output from running PushButton as a background process from a Telnet session

contents (such as these date stamps, which have only attributes)

To write tests for passwords, we ll need to add two new attributes to the @attr hash, password and password_confirmation As you can probably guess, the password_confirmation attribute will be used for the password confirmation step Let s write tests for the presence of the password and its confirmation, together with tests confirming that the password is a valid length (restricted somewhat arbitrarily to be between 6 and 40 characters long) The results appear in Listing 71

TINI Id:7 Id:7 Id:7 Id:7 Id:7 Id:7 /> java PushButtontini & Event count: 1 Event count: 2 Event count: 3 Event count: 4 Event count: 5 Event count: 6

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require 'spec_helper' describe User do before(:each) do @attr = { :name => "Example User", :email => "user@examplecom", :password => "foobar", :password_confirmation => "foobar" } end it "should create a new instance given valid attributes" do Usercreate!(@attr) end describe "password validations" do it "should require a password" do Usernew(@attrmerge(:password => "", :password_confirmation => "")) should_not be_valid end

it "should require a matching password confirmation" do Usernew(@attrmerge(:password_confirmation => "invalid")) should_not be_valid end it "should reject short passwords" do short = "a" * 5 hash = @attrmerge(:password => short, :password_confirmation => short) Usernew(hash)should_not be_valid end

The fact that the external interrupt is a shared system-wide resource can be seen by running another instance of PushButton in the background of the same Telnet session

As in the previous example, when a date and/or time must be specified in an element (as in the <PUBLISH_DATE> element), a good way to do it is to use the following format:

it "should reject long passwords" do long = "a" * 41 hash = @attrmerge(:password => long, :password_confirmation => long) Usernew(hash)should_not be_valid end end end

TINI Id:7 Id:8 Id:8 Id:7 Id:8 Id:7 /> java PushButtontini & Event count: 7 Event count: 1 Event count: 2 Event count: 8 Event count: 3 Event count: 9

Note in Listing 71 how we first collect a set of valid user attributes in @attr If for some reason those attributes aren t valid as would be the case, for example, if we didn t implement password confirmations properly then the first test

would catch the error The subsequent tests then check each validation in turn, using the same @attrmerge technique first introduced in Listing 611 Now for the application code, which contains a trick Actually, it contains two tricks First, you might expect at this point that we would run a migration to add a password attribute to the User model, as we did with the name and email attributes in Listing 61 But this is not the case: we will store only an encrypted password in the database; for the password, we will introduce a virtual attribute (that is, an attribute not corresponding to a column in the database) using the attr_accessor keyword, much as we did with the original name and email attributes for the example user in Section 445 The password attribute will not ever be written to the database, but will exist only in memory for use in performing the password confirmation step (implemented next) and the encryption step (implemented in Section 712 and Section 72)

10

The second trick is that we will not introduce a password_confirmation attribute, not even a virtual one Instead, we will use the special validation

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