Apple WebObjects 3.5 Manual de usuario descargar pdf (Pagina 47)

Initialization and Deallocation Methods

- awake {

/* initializations go here */

}

public void awake () {

/* initializations go here. */

}

Application Initialization

The application init method is invoked only once, when the application is

launched. You perform two main tasks in the application’s

init method:

• Initialize application variables

• Conﬁgure applicationwide settings

For example, the Visitors application has this

init method in Application.wos:

// WebScript Visitors Application.wos

- init {

[super init];

lastVisitor = @"";

[self setTimeOut:7200];

return self;

}

// Java Visitors Application.java

public Application () {

super();

...

lastVisitor = "";

setTimeOut(7200);

...

}

This method begins by calling the application’s init method. Then, it

initializes the application variable

lastVisitor to be the empty string. (The

application has just started, so there has been no last visitor.) Finally, it sets

the application to terminate after it has been running 2 hours.

This example sets the application time-out value. You might want to do

other conﬁgurations in the application object’s

init method as well. For

example, you can control how pages and components are cached and how

state is stored. For more information, read the chapter “Managing State”

(page 109).

The application’s

awake method is invoked at the start of every cycle of the

request-response loop. Therefore, in the

awake method, you perform

anything that should happen before each and every user request is

processed. For example, the DodgeDemo example application keeps track

of the number of requests the application has received. It increments and

logs that number at the top of the request-response loop:

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 217 218

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Apple WebObjects 3.5 Manual de usuario Pagina 47

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