openbook.server

Interface OpenBookService

public interface OpenBookService

A simple service to select Books, purchase them and manage their inventory. A service handle can be obtained from Service Factory.

Author:

Pinaki Poddar

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_UNIT_NAME

Method Summary

Modifier and Type	Method and Description
void	clean() Cleans everything.
long	count(Class<?> cls) Count the number of instances of the given persistent type.
PurchaseOrder	deliver(PurchaseOrder order) Delivers the given order.
<T> List<T>	getExtent(Class<T> entity)
List<PurchaseOrder>	getOrders(PurchaseOrder.Status status, Customer customer) Gets the list of orders of given status.
String	getQuery(String title, Double min, Double max, String author) Gets the query String for the given parameters.
List<Inventory>	getReorderableBooks(int limit) Gets the list of Books whose inventory is lower than the given limit.
javax.persistence.EntityManagerFactory	getUnit() Gets the underlying persistence unit.
String	getUnitName() Gets the name of the underlying persistence unit.
boolean	initialize(Map<String,Object> loadParameters) Populates the underlying data repository with sample values, only if the data repository is empty.
boolean	isManaged() Affirms if the transaction on this persistence unit is managed by a container.
Customer	login(String name) Starts a session for the given named Customer.
PurchaseOrder	placeOrder(ShoppingCart cart) Buys the content of the given cart.
<T> List<T>	query(String jpql, Class<T> resultClass, QueryDecorator... decorators) Runs an arbitrary JPQL query to return a list of result.
List<Book>	select(String title, Double min, Double max, String author, QueryDecorator... decorators) Selects a list of Books matching the given conditions.
Book	supply(Book b, int quantity) Add inventory of the given Book by the given quantity.

Field Detail

DEFAULT_UNIT_NAME

static final String DEFAULT_UNIT_NAME

See Also:

Constant Field Values

Method Detail

login

Customer login(String name)

Starts a session for the given named Customer. If no record of the given name exists, a new Customer record is created.

Parameters:

name - name of a possibly existing customer. Or a new one.

Returns:

a Customer

select

List<Book> select(String title,
                  Double min,
                  Double max,
                  String author,
                  QueryDecorator... decorators)

Selects a list of Books matching the given conditions. Each of the conditional parameter can be null. A null parameter implies that the resultant query should ignore that parameter.

Parameters:

title - title of the Book

min - minimum price

max - maximum price

author - name of author

decorators - to modify the executable query such as its range.

getQuery

String getQuery(String title,
                Double min,
                Double max,
                String author)

Gets the query String for the given parameters. Each of the conditional parameter can be null. A null parameter implies that the resultant query should ignore that parameter.

Parameters:

title - title of the Book

min - minimum price

max - maximum price

author - name of author

decorators - to modify the executable query such as its range.

query

<T> List<T> query(String jpql,
                  Class<T> resultClass,
                  QueryDecorator... decorators)

Runs an arbitrary JPQL query to return a list of result.

Parameters:

jpql - a valid JPQL query string.

resultClass - type of the result.

decorators - zero or more QueryDecorators to be applied before Query is executed.

Returns:

the selected instances.

getExtent

<T> List<T> getExtent(Class<T> entity)

placeOrder

PurchaseOrder placeOrder(ShoppingCart cart)

Buys the content of the given cart.

Parameters:

cart - a non-empty cart.

Returns:

a PurchaseOrder for the content of the cart.

deliver

PurchaseOrder deliver(PurchaseOrder order)

Delivers the given order. Delivery changes the status of the order, decrements inventory and finally removes the line items.

Parameters:

order - a PENDING order to be delivered.

Returns:

the PurchaseOrder after delivery.

supply

Book supply(Book b,
            int quantity)

Add inventory of the given Book by the given quantity.

Parameters:

b - a Book whose inventory is to be incremented

quantity - positive number.

Returns:

the Book after incrementing its inventory.

getOrders

List<PurchaseOrder> getOrders(PurchaseOrder.Status status,
                              Customer customer)

Gets the list of orders of given status.

Parameters:

status - status of the orders. null implies all orders.

Returns:

list of orders sorted by their placement dates.

getReorderableBooks

List<Inventory> getReorderableBooks(int limit)

Gets the list of Books whose inventory is lower than the given limit.

Parameters:

limit - reorder limit. null implies all inventory.

Returns:

list of Books with inventory lower than the given limit.

count

long count(Class<?> cls)

Count the number of instances of the given persistent type.

Parameters:

cls - a persistent type.

Returns:

number of persistent entity of the given type.

initialize

boolean initialize(Map<String,Object> loadParameters)

Populates the underlying data repository with sample values, only if the data repository is empty.

Parameters:

loadParameters - control the number of Books etc. to be created. null is allowed.

Returns:

true if the repository is initialized by this invocation.

clean

void clean()

Cleans everything. Be careful.

getUnit

javax.persistence.EntityManagerFactory getUnit()

Gets the underlying persistence unit.

getUnitName

String getUnitName()

Gets the name of the underlying persistence unit.

isManaged

boolean isManaged()

Affirms if the transaction on this persistence unit is managed by a container.