Design pattern for interface with transactions

[=?ISO-8859-1?B?QW5kcukgSORuc2Vs?=]

Hi,

I am writing a library to access a web service and perform several
transaction with this web service:

class ErpInterfaceTransaction
{
private $erpinterface,
$transactionid;

public function __construct($erpinterface)
{
$this->erpinterface = $erpinterface;
$this->transactionid = uniqid();
}

public function place_order()
{
file_get_contents('http://gateway/process.php?token='.$this-

>erpinterface->token.'&action=place_order');

}
}

class ErpInterface
{
public $token;

public function begin_transaction()
{
return new ErpInterfaceTransaction($this);
}
}

Should I make the ErpInterfaceTransaction class extend the
ErpInterface class?
I need to make $token public because the transactions need it (see
"$this->erpinterface->token"). Can I avoid this?
What is the preferred design pattern for such a construction?

Regards,
André

[Jerry Stuckle]

André Hänsel wrote:

Hi,

I am writing a library to access a web service and perform several
transaction with this web service:

class ErpInterfaceTransaction
{
private $erpinterface,
$transactionid;

public function __construct($erpinterface)
{
$this->erpinterface = $erpinterface;
$this->transactionid = uniqid();
}

public function place_order()
{
file_get_contents('http://gateway/process.php?token='.$this-

>erpinterface->token.'&action=place_order');

}
}

class ErpInterface
{
public $token;

public function begin_transaction()
{
return new ErpInterfaceTransaction($this);
}
}

Should I make the ErpInterfaceTransaction class extend the
ErpInterface class?
I need to make $token public because the transactions need it (see
"$this->erpinterface->token"). Can I avoid this?
What is the preferred design pattern for such a construction?

Regards,
André

André,

The easiest way to answer that is to use "is-a" thinking, i.e. "Is an
Employee a type of Person?" "Is a Truck a type of Vegetable?"

In the first case, the answer is yes - so Employee should extend Person.
In the second case, the answer is no - so a Truck should not extend
Vegetable (although the truck may contain vegetables).

So - "Is an ErpInterfaceTransaction" a type of "ErpInterface"? It looks
like not - rather, the transaction USES the interface. So the interface
should be a member of transaction object.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attglobal.net
==================

[=?ISO-8859-1?B?QW5kcukgSORuc2Vs?=]

On Jun 23, 4:23 am, Jerry Stuckle <[e-mail]:

So - "Is an ErpInterfaceTransaction" a type of "ErpInterface"? It looks
like not - rather, the transaction USES the interface. So the interface
should be a member of transaction object.

This is why I didn't make it this way, but if I did, I could have made
$token protected instead of public.