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The communications API provides a mechanism for asynchronous noti cation of interesting serial port events such as state changes in the modem control lines and when data is available On TINI the events are propagated by a daemon thread that listens for state changes in the serial port drivers The daemon thread is created when the rst event listener is registered using the addEventListener method in the SerialPort class The argument listener passed to method addEventListener requires an instance of a class that implements the SerialPortEventListener interface

has_many :following, :through => :relationships, :source => "followed_id"

public void addEventListener(SerialPortEventListener listener) throws TooManyListenersException public void removeEventListener()

To return the results in XML format, you simply change this code by adding the FOR XML clause, along with at least one argument that I'll explain shortly

This code automatically populates userfollowing with an array of followed users A diagram of the data model appears in Figure 127

3 Unfortunately, Rails uses connection for a database connection, so introducing a Connection model leads to some rather subtle bugs (I learned this the hard way when developing Insoshi) 4 Indeed, this construction is so characteristic of Rails that well-known Rails programmer Josh Susser used it as the name of his geek blog

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The removeEventListener can only be invoked by a listener Event listeners are automatically removed when the port is closed For every serial port event there exists one method with a notifyOn pre x The listener chooses the events for which it wishes to be noti ed by invoking

userfollowing user relationships followed_id follower_id 2 1 7 1 1 3 2 7 10 1 1 2 8 1 1 9 id 2 has_many has_many id 7 name user has_many has_many id 8 name id 10 name user email email name user email email

3

To get started with the implementation, we first generate a Relationship model as follows:

This query returns the following results (only the first few rows are shown for brevity):

Since we will be finding relationships by follower_id and by followed_id, we should add an index on each column for efficiency, as shown in Listing 121

the appropriate notifyOn* method on a SerialPort object So, for example, to receive noti cation when serial data is available, a listener invokes the notifyOnDataAvailable method

class CreateRelationships < ActiveRecord::Migration def selfup create_table :relationships do |t| tinteger :follower_id tinteger :followed_id ttimestamps end

public void notifyOnDataAvailable(boolean enable)

add_index :relationships, :follower_id add_index :relationships, :followed_id end def selfdown drop_table :relationships end end

<row ContactName="Maria Anders" /> <row ContactName="Hanna Moos" /> <row ContactName="Sven Ottlieb" />

An enable value of true enables noti cation for the speci ed event Noti cation can be disabled at any time by invoking the same method with an enable value of false The SerialPortEventListener interface de nes the serialEvent method that is invoked when an event for which the listener has requested noti cation occurs

We then migrate the database and prepare the test database as usual:

The result is the Relationship data model shown in Figure 128 As with any new model, before moving on, we should define the model s accessible attributes In the case of the Relationship model, the followed_id should be accessible, since users will create relationships through the web, but the follower_id attribute should not be accessible; otherwise, malicious users could force other users to follow them The result appears in Listing 122

public void serialEvent(SerialPortEvent ev)

Before implementing following and followers, we first need to establish the association between users and relationships A user has_many relationships, and since relationships involve two users a relationship belongs_to both a follower and a followed user As with microposts in Section 1112, we will create new relationships using the user association, with code such as

By simply adding "FOR XML RAW," SQL Server returned the results in XML format If you have access to SQL Server 2000, you can issue this same query on the Northwind database, and you'll see the same results, providing you haven't modified the database The last part of the FOR XML clause shown indicates the mode, or format, of the returned XML content For this example, I chose the RAW mode, which simply returns each row in an element named row, and columns of the row are returned as attributes of the element

Listeners invoke the getEventType method on the SerialPortEvent object passed to serialEvent to determine the source of the event

userrelationshipscreate(:followed_id => )

We start with a test, shown in Listing 123, which builds an @relationships instance variable (used below) and makes sure that it can be saved using save! As with create!, the save! method raises an exception if the save fails; compare this to the use of create! in Listing 114

public int getEventType()

Listing 123 Testing Relationship creation with save!

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