Apple WebObjects 3.5 Uživatelský manuál stáhnout pdf (Strana 133)

Controlling Session State

133

You can see implementations of encodeWithCoder: and initWithCoder: in the

DodgeDemo application, in the class ShoppingCart.

- encodeWithCoder:(NSCoder *)coder {

[coder encodeObject:carID];

[coder encodeObject:colorID];

[coder encodeObject:colorPicture];

[coder encodeObject:packagesIDs];

[coder encodeObject:downPayment];

[coder encodeObject:leaseTerm];

}

- initWithCoder:(NSCoder *)coder {

self = [super init];

carID = [[coder decodeObject] retain];

colorID = [[coder decodeObject] retain];

colorPicture = [[coder decodeObject] retain];

packagesIDs = [[coder decodeObject] retain];

downPayment = [[coder decodeObject] retain];

leaseTerm = [[coder decodeObject] retain];

car = nil;

return self;

}

The Java version of DodgeDemo’s ShoppingCart implements these

methods instead:

public void encodeWithCoder(Coder coder) {

coder.encodeObject(leaseTerm);

coder.encodeObject(downPayment);

// DodgeDemoJava defines a custom Car object that contains all

// info about the car.

coder.encodeObject(car);

}

public ShoppingCart(Coder coder) {

super();

leaseTerm = coder.decodeObject();

downPayment = coder.decodeObject();

Car aCar = (Car)coder.decodeObject();

setCar(aCar);

}

For more information on archiving, see the class speciﬁcations for

NSCoding, NSCoder, NSArchiver, and NSUnarchiver in the Foundation

Framework Reference.

Controlling Session State

Maintaining state in memory on the server can consume considerable

resources, so WebObjects provides a number of mechanisms to control how

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