Ecommerce theory question...

I've been working on my first online store, and just have a
quick question that struck me whilst trying to think ahead, and how
people could potentially break the system.
I'm using web assist's ecart, and as it's my first, I'm not
sure how things are typically set up.
Basically this set up involves sending the customer to an
externam payment gateway, where card details are taken and
processed, before the customer is returned to the main site.
At the point where the customer is sent on to the gateway, a
record is created in an orders table, which includes a field 'Order
Status', which defaults to 'Pending'. Once the payment has been
approved, the customer is passed back to a 'return' page, which
contains a script to update the order status field from 'pending'
to 'accepted'.
It also seems like a logical place to generate a receipt to
be sent out to the customer.
My question is this tho' - what's to stop a savvy customer
getting to the payment gateway, but not entering any payment
details, and then just manually going to the return page, which
would trigger the update 'Order Status' field, and even worse,
generate a receipt for something which hadn't actually been paid
for?

I suppose the session variables set by the success/failure of
the
transaction between the cart and the payment gateway would be
the roadblock
for this scheme. Surely the return page would check for that
before
triggering the update....
Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
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"Iain71" <[email protected]> wrote in
message
news:[email protected]...
> I've been working on my first online store, and just
have a quick question
> that
> struck me whilst trying to think ahead, and how people
could potentially
> break
> the system.
>
> I'm using web assist's ecart, and as it's my first, I'm
not sure how
> things
> are typically set up.
>
> Basically this set up involves sending the customer to
an externam payment
> gateway, where card details are taken and processed,
before the customer
> is
> returned to the main site.
>
> At the point where the customer is sent on to the
gateway, a record is
> created
> in an orders table, which includes a field 'Order
Status', which defaults
> to
> 'Pending'. Once the payment has been approved, the
customer is passed back
> to a
> 'return' page, which contains a script to update the
order status field
> from
> 'pending' to 'accepted'.
>
> It also seems like a logical place to generate a receipt
to be sent out to
> the
> customer.
>
> My question is this tho' - what's to stop a savvy
customer getting to the
> payment gateway, but not entering any payment details,
and then just
> manually
> going to the return page, which would trigger the update
'Order Status'
> field,
> and even worse, generate a receipt for something which
hadn't actually
> been
> paid for?
>
>
>

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Visibility Theory Question

Let's say a reference to an object is visible using final, volatile, synchronized access, whatever. My understanding is that as a result, that reference will now be visible. If someone assigns it a new object, it will point to that object and immediate become visible. However, my question is: will the referred object's data be visible?
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@Immutable
public final class ThreeStooges {
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Thanks in advance!
Edited by: wijjit on Apr 21, 2010 7:08 PM

wijjit wrote:
No need to be condescending. I was not being condescending.
Yes I am.Yes you are what? Talking about visibility of writes of shared variables across threads?
You'll find you'll get better answers if you state your question clearly and precisely. This is not particular to Java or Computer Science.
Tx writes "wijjit" into the stooges HashSet. Ty then calls isStooges("wijjit"); (a read). My question is: Wouldn't it be possible that the isStooges called by Ty returns false even though Tx wrote something into it because the internals of HashSet does not guarantee happens-before order, proper synchronization, visibility (however, you want to properly phrase it)?If we call stooges.add(), and there's no syncing or volatile variables, then it's entirely possible that other threads will see an inconsistent or invalid state of the Set, or just see the Set as is was before the add(), or see the Set as it was after the add().
If stooges is volatile, that doesn't help at all for this case. It only means that any value that we assign to stooges will be immediately visible to all other threads. It does not affect the visibility of any internal changes to the object stooges points to.
If, however, we synchronize all access to the map pointed to by stooges--all on the same lock, of course--then the Set will never be seen in an inconsistent state.
T1                               T2
synchronized (stooges) {       synchronized (stooges) {
stooges.add(x);                for (Stooge stooge : stooges) {
stooges.remove(y);               stooge.doStuff();
                               }T2 will either see the Set as it exists before any of the above T1 actions, or after all of the above T1 actions. Anything that T1 does inside that sync block--regardless of whether it relates to the Set pointed to by stooges--will be visible to T2 (if T2 gets the lock after T1, rather than before).
Edited by: jverd on Apr 21, 2010 8:03 PM

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If the backup (volume snapshot) integration services are installed in the guest operating system, a VSS requester is installed that will allow VSS writers in the guest operating system to participate in the backup of the VM. "
Backing Up the Virtual Machines
Hyper-V uses one of two mechanisms to back up each VM. The default backup mechanism is called the "Saved State" method, where the VM is put into a saved state during the processing of the PrepareForSnapshot event,snapshots
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Backup (volume snapshot) Integration Service is installed and running in the child VM.
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Michael

Hi,
The two backup mechanisms used in the different backup scenario:
Short to say is:
Perform a backup from the server running Hyper-V
(host).
Perform a backup from
within the guest operating system of a virtual machine.
The detail explain is:
There are two basic methods you can use to perform a backup. You can:
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VSS writer, you can perform a full server backup that helps protect all of the data required to fully restore the server, except the virtual networks. The data included in such a backup includes the configuration of virtual machines, snapshots associated with
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are not included in a full server backup. You will need to reconfigure the virtual networking by recreating the virtual networks and then reattaching the virtual network adapters in each virtual machine to the appropriate virtual network. As part of your backup
planning, make sure you document the configuration and all relevant settings of your virtual network if you want to be able to recreate it.
• Perform a backup from within the guest operating system of a virtual machine.
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method, you should use it in addition to a full server backup and not as an alternative to a full server backup. Perform a backup from within the guest operating system before you perform a full backup of the server running Hyper-V. For more information about
storage considerations, see the following section.
The related KB:
Planning for Backup
http://technet.microsoft.com/en-us/library/dd252619(v=ws.10).aspx
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Java theory question

Hi,
Why is it possible that we can declare a variable to be of an interface type and yet at the same time assign to it an object?
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You can't use the non-interface methods in FirstClass. The only thing that's important when you writeList list = new LinkedList ();is that you're interested in the methods (and fields) that are defined in the interface. You can't use removeFirst (which is in LinkedList), but you're not interested in it.

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1. How does Java support connection-based communications between two processes ?
2 Why is use-case or scenario-based testing important in testing object-oriented programs.
3. Explain the role of PAM (Pluggable Authentication Modules) in creating secure applications.
4. What is a midlet and when should it be used?
5 Explain how the following conventional testing strategies relate to testing object-oriented software: unit testing and integration testing
6. Explain how designing java programs using UML design techniques can improve a Java program
7. Explain how Servlets can be used in the server side of an application ?
8. When should JSP be used in preference to servlets.
9. Explain what standard actions are and the function of <jsp: forward> standard action.
10. Explain the purpose of a URLConnection object?
11. Explain how Java technology can access remote objects
12. What role does the SecurityManager object play securing java applications and provide an example
13. What is the Java Authentication and Authorization Service and how can it be used to develop secure java applications

1. How does Java support connection-based
communications between two processes ? It does this by using what is called the Windows Communication Foundation (WCF).
2 Why is use-case or scenario-based testing important
in testing object-oriented programs.This is so the Project manager will be able to determine scope in future releases.
3. Explain the role of PAM (Pluggable Authentication
Modules) in creating secure applications. PAM helps secure browser cookies from being stuck to the TRAY (Turnable Remote Activation Yearner) after BAKE (Billing Accounts Kernel Energizer)
4. What is a midlet and when should it be used?Within the presentation tier.
5 Explain how the following conventional testing
strategies relate to testing object-oriented
software: unit testing and integration testingUnit testing should be done on the production environment while integration testing should be to verify software needs.
6. Explain how designing java programs using UML
design techniques can improve a Java program UML design techniques improve a code's readability.
7. Explain how Servlets can be used in the server
side of an application ?They can be used for automatically generating dynamic GUI applications.
8. When should JSP be used in preference to servlets.When one wants to display their presentation layer within the database tier.
9. Explain what standard actions are and the function
of <jsp: forward> standard action. This action moves the JSP to the next line of execution.
10. Explain the purpose of a URLConnection object?This object is to maintain a browser instance within a GUI application.
11. Explain how Java technology can access remote
objectsThey do this by creating a contract with which SOA components can communicate.
12. What role does the SecurityManager object play
securing java applications and provide an exampleThe SecurityManager object provides an encryption key for preventing DDOS attacks from remote locations.
n and Authorization Service and how can it be used to
develop secure java applicationsThe Authorization Service is used to authenticate users based on applet certificates.

Log chain theory question

Hello!
As per BOL:
http://msdn.microsoft.com/en-us/library/ms186299(v=sql.105).aspx
begins_log_chain bit 1 - This is the first in a continuous chain of log backups.
A log chain begins with the first
log backup taken after the database is created or when it is switched from the simple to the full or bulk-logged recovery model.
As per http://msdn.microsoft.com/en-us/library/ms190440%28v=sql.105%29.aspx
The Log Chain
A continuous sequence of log backups is called a log chain.
A log chain starts with a full backup of the database. Usually, a new log chain is only started when the database
is backed up for the first time or after the recovery model is switched from simple recovery to full or bulk-logged recovery.
So what really starts a log chain - a DB or a LOG
backup???
Thank you in advance,
Michael

Michael,
The confusion falls in the fact that once a database has been changed from Simple to full or bulk logged recovery model then the transaction log will continue to truncate itself upon a checkpoint. The reason is that SQL is
smart enough to know that a database backup has not yet been taken so there is no possibility to recover the database to a point in time. This is sometimes referred to as pseudo simple recovery. After a database backup is taken then the transaction
log will only be truncated after a transaction log backup.
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