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status = inventory.increaseStockLevel(itemId, quantity);

else if(itemState == BACK_ORDERED)

status = inventory.increaseBackorderLevel(itemId,quantity);

else if(itemState == PRE_ORDERED)

status = inventory.increasePreorderLevel(itemId, quantity);

Displaying an Item’s Availability to a Customer

The inventory manager is also used when building site pages. Display an item’s availability status to a

customer browsing the site with the following code:

int availability = inventory.queryAvailabilityStatus(itemId);

Filling Partial Orders

You can configure the fulfillment system to fill a partial order and backorder the rest if there is not enough

inventory to fulfill an entire order. For example, if a customer orders five towels, but there are only three

towels available, you can configure the Fulfillment system to “purchase” as many items as possible and

backorder any additional items. Follow these steps to make the configuration changes:

Determine how many items are available using

InventoryManager.queryStockLevel()

Purchase that amount remaining using

InventoryManager.purchase()

Note: It is possible that another customer could purchase these items in the time

between when you called

queryStockLevel

and called purchase. If this is the case,

you can either loop until the purchase is successful or there is no inventory left or you

can extend the

InventoryManager

to purchase all items available.

Create a new

ShippingGroupCommerceItemRelationship

in the same shipping

group as the item currently being processed and for the same

CommerceItem

. Set the

old relationship’s quantity to whatever was successfully purchased. Set the new

relationship’s quantity to the remaining quantity. The state of the old relationship is

PENDING_DELIVERY while the state of the new relationship will depend on

InventoryManager.queryAvailabilityStatus()

Preventing Inventory Deadlocks

InventoryManager

includes the

acquireInventoryLocks

and

releaseInventoryLocks

methods.

These methods can be used to prevent deadlocks in the database, especially if there are multiple ATG

Commerce instances concurrently updating inventory.

acquireInventoryLocks

acquires locks for the inventory items that apply to the given IDs.

releaseInventoryLocks

releases locks for the inventory items that apply to the given IDs.

RepositoryInventoryManager

implements

acquireInventoryLocks

by calling

RepositoryInventoryManager.lock

for each id (plus each id within a bundle). It does not implement

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releaseInventoryLocks

since those locks will be released automatically with the end of the

transaction.

The following example demonstrates how to use these methods to prevent deadlocks:

void myPurchase(List pCatalogRefIds, long pQuantity)

{

InventoryManager im = getInventoryManager();

try {

im.acquireInventoryLocks(pCatalogRefIds);

Iterator idIterator = pCatalogRefIds.iterator();

int success;

while(idIterator.hasNext()) {

String id = (String) idIterator.next();

success = im.purchase(id, pQuantity);

. . .

}

finally {

im.releaseInventoryLocks(pCatalogRefIds);

}

Handling Bundled SKUs in the Inventory

When a SKU is bundled into a collection of SKUs, the

RepositoryInventoryManager

handles the

bundle differently than an individual SKU.

The default ATG Commerce implementation defines bundles as lists of SKUs in the Product Catalog. For

more information, see the Using and Extending the Product Catalog chapter. SKUs that represent a

bundle have a

bundleLinks

property that is a list of each

skuLink

in the bundle. Each

skuLink

contains

a quantity and a SKU (from the Product Catalog).

SKUs that do not represent a bundle correspond to one item in the inventory repository and have an

empty

bundleLinks

list. In this way, new bundles can be defined in the product catalog, without

referring to or updating the inventory repository. Alternatively, bundles can be defined within the

inventory as a separate inventory item by extending the

RepositoryInventoryManager

. Information

on extending the

RepositoryInventoryManager

is described in this section.

The

RepositoryInventoryManager

calculates the

stocklevel

of a bundle based on the

stockLevel

of each item in bundle. These values are kept up to date in real time in each query method. The

stockLevel

is the largest number of bundles that could be purchased given the

stocklevel

of the

SKUs in the bundle. For example:

The Bundle SKU D contains

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

1 of SKU A



2 of SKU B



10 of SKU C

The

stocklevel

values for the individual SKUs are:



SKU A

stocklevel

= 20



SKU B

stocklevel

= 20



SKU C

stocklevel

= 20

Therefore, SKU D’s (the bundle’s)

stocklevel=2

because that is how many bundles could successfully be

purchased given the current inventory.

A bundle’s

backorderLevel

and

preorderLevel

are calculated in a similar way.

RepositoryInventoryManager

sets the threshold of bundles as 0 to prevent events from being

triggered when purchasing a bundle. If one of the bundle’s SKUs falls below its threshold, an event is

triggered. This is true for the

stockThreshold

backorderThreshold

, and

preorderThreshold

The

availabilityDate

of a bundle is the latest

availabilityDate

of the SKUs in the bundle. The

availabilityStatus

of a bundle is calculated as follows:



OUT_OF_STOCK – Indicates that at least one of the bundled items is OUT_OF_STOCK

or that the

stockLevel

backorderLevel

, and

preorderLevel

are all below the

quantity needed for one bundle.



PREORDERABLE – Indicates that none of the items is OUT_OF_STOCK, but at least one

of the bundled items is PREORDERABLE.



BACKORDERABLE – Indicates that none of the items are OUT_OF_STOCK or

PREORDERABLE, but at least one of the items is BACKORDERABLE.



IN_STOCK – Indicates that all of the bundled items are IN_STOCK with a

stockLevel

greater than the quantity of the item included in one bundle.

When a bundle is purchased, the call is successful if all of the bundled SKUs are IN_STOCK. If it is

successful, the

stocklevel

of each SKU is decreased by the number of bundles purchased multiplied by

the number of SKUs contained in the bundle. In the example above if someone successfully purchased

the Bundle, the

stocklevel

of SKU A would be decreased to 19, the

stocklevel

of SKU B to 18, and the

stocklevel

of SKU C to 10.

Bundle processing makes it possible for a SKUs

backorderLevel

to decrease even if there are enough

items in stock. Consider the example above replacing SKU A’s

stockLevel

with 0. The bundle is not

IN_STOCK now. Assume that all the items have a

backorderLevel

of 100. The fulfillment framework will

try to backorder the bundle. The

RepositoryInventoryManager

will set SKU A’s

backorderLevel

99, SKU B’s

backorderLevel

to 98, and SKU C’s

backorderLevel

to 90 even though there is stock

available for SKU B and SKU C. When the fulfillment framework later calls

purchaseOffBackorder

, each

backorderLevel

will be increased back to 100 (assuming no one else backordered the items in the

meantime) and each

stockLevel

will be decreased as described above.

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When the

HardgoodFulfiller

receives an

UpdateInventory

message, it looks for orders that contain

items with the

catalogRefId

specified in the

UpdateInventory

message. The items also must have a

ShippingGroupCommerceItemRelationship

in BACK_ORDERED, PRE_ORDERED, or OUT_OF_STOCK

state. Therefore, if an item is a bundle, the

catalogRefId

of the bundle needs to be included in the

message for orders waiting on that bundle to be updated. It is not sufficient to include only the

component of the bundle that was updated.

Building a Store without Bundles

RepositoryInventoryManager

can be used as the inventory system for a store even if it does not have

bundles. If your system does not include bundles, then none of the items will be treated as bundled. If you

don’t want SKUs with a non-empty

bundleLinks

property to be treated as bundles, extend the

RepositoryInventoryManager

and override the

isBundle()

method to always return false. This will

force the inventory system to treat all items the same way. Perform the same extension to the

RepositoryInventoryManager

if you want bundles to be processed in the same way as regular SKUs.

Changing the Bundle Handling

If you want to handle bundles in a different way than described above, but you want process SKUs that

are not bundles in the same way, extend the

RepositoryInventoryManager

and override the bundle-

specific methods.

The methods listed below are called with the methods of the

InventoryManager

API if the ID passed in

is a bundle. For example, if

purchase(someId)

is called and

someId

refers to a bundle, purchase will call

purchaseBundle(someId)

. These methods are implemented in

RepositoryInventoryManager

, but

not in any of the other classes.



isBundle



purchaseBundle



purchaseBundleOffBackorder



purchaseBundleOffPreorder



preorderBundle



backorderBundle



queryBundleStocklevel



queryBundleBackorderLevel



queryBundlePreorderLevel



queryBundleStockThreshold



queryBundleBackorderThreshold



queryBundlePreorderThreshold



queryBundleAvailabilityDate



deriveBundleAvailabilityStatus

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Inventory Repository

ATG Commerce comes with two repositories that are relevant to the inventory system: the Product

Catalog and the Inventory Repository. The Product Catalog stores prices, descriptions, images, and fulfiller

information. For more information, see the Using and Extending the Product Catalog chapter. The

Inventory Repository stores the

stockLevel

, availability information, and other inventory data.

This section describes the inventory repository that is included with ATG Commerce out of the box. The

inventory information is stored in a separate repository from the product catalog. Each inventory method

takes an ID from the product catalog and uses that information to get the inventory ID.

The inventory definition is stored in

atg/commerce/inventory/inventory.xml

. Each item in the

inventory has the following properties.

Property

Definition

creationDate

The date this inventory item was created.

startDate

The inventory item will not be available until this date.

endDate

The inventory item will not be available after this date.

displayName

The name that is displayed to the user to represent this

inventory item.

description

A description of this inventory item.

catalogRefId

The SKU ID in the Product Catalog to which this inventory item

refers.

availabilityStatus

The status of this inventory item. It is an enumerated type. The

integer code for each possible value is shown. The following

codes represent availability status:

INSTOCK (1000) - This item is in stock.

OUTOFSTOCK (1001) – This item is out of stock.

PREORDERABLE (1002)- This item may be preordered.

BACKORDERABLE (1003) - This item may be backordered.

DERIVED (1004) - This item’s

availabilityStatus

should be

derived from the values of its

stockLevel

backorderLevel

and

preorderLevel

. DERIVED is the default value for

availabilityStatus

DISCONTINUED (1005) – This item is discontinued.

availabilityDate

The date on which this item will be available if not currently

available.

stockLevel

The amount of stock available for purchase. The value -1

indicates that an infinite amount is available.

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backorderLevel

The amount of this item that can be backordered. The value –1

indicates that the inventory system accepts an infinite number

of backorders for this item.

preorderLevel

The amount of this item that can be preordered. The value –1

indicates the inventory system accepts an infinite number of

preorders for this item.

stockThreshold

If the

stockLevel

falls below this amount, a warning event is

generated.

backorderThreshold

If the

backorderLevel

falls below this amount, a warning

event is generated.

preorderThreshold

If the

preorderLevel

falls below this amount, a warning

event is generated.

Inventory JMS Messages

The

InventoryManager

creates Java Messaging Service (JMS) messages for the following events:

JMS Message Name

When message occurs

Information included in

message

InventoryThresholdReached

When

stocklevel

backorderLevel

, or

preorderLevel

falls

below its associated

threshold.

The ID number of the

item.

Name of property

(

stocklevel

backorderLevel

, or

preorderLevel

)

Value of property

Value of threshold

UpdateInventory

When the stock level

increases. (In the

RepositoryInventoryM

anager

, it occurs when

someone calls

inventoryWasUpdated

)

The IDs of all items that

have stock available and

were previously

BACKORDERABLE,

PREORDERABLE, or

OUT_OF_STOCK.

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Configuring the SQL Repository

The

InventoryManager

implementations that ATG Commerce provides out of the box require the

atg.service.cache

package and an instance of the Generic SQL Adapter. For more information on SQL

Repositories, see the ATG Repository Guide.

The SQL Repository must be configured before the

RepositoryInventoryManager

can use it. You must

set values for the following properties:



stocklevel

(optional)



backorderLevel

(optional)



preorderLevel

(optional)



stockThreshold

(optional)



backorderThreshold

(optional)



preorderThreshold

(optional)



availabilityStatus

(required)



availabilityDate

(optional)

If the properties above are not included, all items will be treated as having a

stockLevel

of –1 (infinite

supply). The

backorderLevel

preorderLevel

stockThreshold

preorderThreshold

, and

backorderThreshold

are set to zero. These default values are configurable in the

RepositoryInventoryManager

The best way to insure that every item in the repository that represents an inventory item has the

required properties is to have a view and/or

ItemDescriptor

in the repository dedicated to the

“inventory item” type. However, this is not specifically required.

Caching the Inventory

By default, caching is turned off for the inventory repository. This is to insure that inventory data is always

up to date across server instances. The

CachingInventoryManager

is provided as an effective inventory

caching mechanism for displaying inventory information.

The

CachingInventoryManager

can be used to display information to customers as they browse the

product catalog because, in most situations, inventory information displayed to customers during catalog

browsing does not need to be updated in real time. Displaying inventory information using the

CachingInventoryManager

improves the performance of the site.

The

CachingInventoryManager

should not be used when real time inventory data is needed. Real time

inventory information is usually needed during the purchase process and fulfillment process. In those

cases, the (uncached)

InventoryManager

should be used during these processes. For more information

on the

CachingInventoryManager

, see the InventoryManager Implementations section.

The

InventoryDroplet

provides cached data to the user when appropriate and accesses real time

inventory data from the repository when appropriate. The

useCache

property allows you to indicate

when to use cached inventory data:

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

If the

useCache

property is set to false, the inventory data in the repository is

provided.



If the

useCache

property is set to true, the cached data is provided.

The GSA can provide more complex types of caching. If appropriate, you can configure two instances of

the

InventoryRepository

GSA, one with no caching and one with distributed caching (set cache-

mode=distributed). You can configure one instance of the

RepositoryInventoryManager

to use the

uncached GSA, and another instance of the

RepositoryInventoryManager

to use the cached GSA. For

more information on distributed caching, see the SQL Repository Caching chapter in the ATG Repository

Guide.

Inventory Repository Administration

You can use the repository editor to administer the inventory system. Because the

RepositoryInventoryManager

is implemented as a front-end to a repository, you can use the

repository editor to edit the

RepositoryInventoryManager

backend. The disadvantage to using the

repository editor is that the

InventoryManager

does not know when the Repository has changed.

Therefore, it cannot perform actions like sending notifications about a pending order upon receipt of

additional inventory.

ATG Commerce includes a very simple user interface for administration of the Inventory Manager. You

can access the interface through the Dynamo Administration pages, as long as the Dynamo

Administration UI is included in your application. Access the Inventory Manager UI using the URL

appropriate for your application server. For example, the default URL on JBoss is:

http://

hostname

:8080/dyn/admin/atg/commerce/admin/inventory/index.jhtml

See the ATG Installation and Configuration Guide to find the default URL.

This page allows an administrator to view the results of the inventory query operations, to manipulate the

various properties of each item, and to notify the system of inventory updates. Out-of-the-box, the

interface allows the administrator to set, increase, or decrease the

stockLevel

backorderLevel

, and

preorderLevel

of any item in the inventory. This page also allows the administrator to set the

stockThreshold

backorderThreshold

preorderThreshold

availabilityStatus

, and

availabilityDate

for each item. is configured through The properties files of the servlet beans

described below configure the updated inventory.

The following Dynamo Server Pages manage the inventory:

Dynamo Server Page

Description

index.jhtml

This page allows you to administer the

InventoryManager

. Provides

access to the functionality mentioned above.

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DisplayInventory.jhtml

Displays inventory information. You can modify this page to display

more or different information for each item in the inventory. It

displays the repository ID of the catalog item, the display name, the

name of the fulfiller, the

stockLevel

, the

stockThreshold

, the

backorderLevel

the

backorderThreshold

, the

preorderLevel

the

preorderThreshold

, the

availabilityStatus

, and any

bundled items.

Both of these pages use the

InventoryFormHandler

to display and manipulate inventory information.

This form handler has two handle methods:

Servlet Bean

Description

handleChangeInventory

Accepts four properties of the

InventoryFormHandler

SKU - the ID of the SKU to change

value - the value to change the property by

changedProperty

- the name of the property to change

setType

- the direction to change it in

For example, if SKU=“sku-0”, value=“5”,

changedProperty

=“

backorderLevel

”, and

setType

=“increase”

then the servlet bean will call:

InventoryManager.increaseBackorderLevel("sku-0", 5)

handleUpdateInventory

Uses the IDs stored in property

InventoryFormhandler.updatedItemIdList

to call

InventoryManager.inventoryWasUpdated

You can also use the

InventoryFormHandler

to display inventory information. It uses the properties

lowerBound

upperBound

batchNumber

batchSize

, and

propertyName

to determine which inventory

items to display. The items that should be displayed are populated in the

InventoryFormHandler.catalogRefIds

. For example, if

lowerBound

is ‘Q’,

upperBound

is ‘R’,

batchSize

is 10,

batchNumber

is 0, and

propertyName

is “

displayName

” all the

catalogRefIds

for

the first 10 items in the product catalog with a display name greater than Q and less than R (sorted by

displayName

) will be in the array

InventoryFormHandler.catalogRefIds

The

SKULookup

servlet bean is an instance of the

ItemLookupRepository

that returns information for a

given SKU in the repository.

Using the InventoryLookup Servlet Bean

The

InventoryLookup

servlet bean returns inventory information based on the input parameters. The

inventory information returned by this servlet bean includes:



availabilityStatus

: the numerical availability status

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

availabilityStatusMsg

: a string that maps to the numerical

availabilityStatus

with the following:

1000: INSTOCK

1001: OUTOFSTOCK

1002: PREORDERABLE

1003: BACKORDERABLE

1005: DISCONTINUED



availabilityDate

: The date on which the item will become available.



stockLevel

: The total number of units currently in stock.



preoderLevel

: The total number of units that are available for preorder.



backorderLevel

: The total number of units that are available for backorder.



stockThreshold

: The threshold for the stock level.



preorderThreshold

: The threshold for the preorder level.



backorderThreshold

: The threshold for the backorder level.

If there is an error retrieving this information, then the

error oparam

will be rendered. All of this

information is contained within a single

inventoryInfo

object, which will be rendered within the

output oparam

This servlet bean takes one required parameter and one optional parameter.



The required parameter is

itemId

. The

itemId

is the

catalogRefId

of the product

catalog SKU whose inventory information will be retrieved.



The optional parameter is

useCache

. If set to true, cached data will be retrieved. This

data may be out of date, depending on how the inventory is updated, so it should be

used with caution. For general store browsing, where performance is critical,

useCache

should be true. If it is essential that the information matches the latest

information in the repository, then

useCache

should be false.

The following code sample is an example of using the

InventoryLookup

servlet bean:

<dsp:droplet name="/atg/commerce/inventory/InventoryLookup">

<dsp:param param="link.item.repositoryId" name="itemId"/>

<dsp:param value="true" name="useCache"/>

<dsp:oparam name="output">

This item is

<dsp:valueof param="inventoryInfo.availabilityStatusMsg"/><br>

There are

<dsp:valueof param="inventoryInfo.stockLevel"/>

left in the inventory.<br>

</dsp:oparam>

</dsp:droplet>

Note: The Inventory Framework can also be configured to use the

LocalizingInventoryDroplet

which is similar to

InventoryLookup

, but can also include a

localeKey

parameter.

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