Group items tagged

by the container in order to realize common use cases

An interface becomes a vehicle for encapsulation or abstraction,

“Interfaces are used to encode similarities which the classes of various types share, but do not necessarily constitute a class relationship. For instance, a human and a parrot can both whistle; however, it would not make sense to represent Humans and Parrots as subclasses of a Whistler class. Rather they would most likely be subclasses of an Animal class (likely with intermediate classes), but both would implement the Whistler interface.” [http://en.wikipedia.org/wiki/Java_interface]

Extensive use of interfaces derives from a

Premature Extensibility Is the Root of Some Evil

The number of artifacts will double and you will have to introduce a configuration facility

resultClass=Employee.class

class Employee

createNamedQuery("findAllEmployeesInCity")

List<Employee>

@NamedNativeQuery

resultSetMapping="employee-address"

@SqlResultSetMapping(name="employee-address", entities={ @EntityResult(entityClass=Employee.class), @EntityResult(entityClass=Address.class)} )

JPA 2.0, still contains only a subset of the features supported by many database vendors

features not supported in JP QL.

performance required by an application is to replace the JP QL query with a hand-optimized SQL version. This may be a simple restructuring of the query that the persistence provider was generating, or it may be a vendor-specific version that leverages query hints and features specific to a particular database.

recommend avoiding SQL initially if possible and then introducing it only when necessary

benefits of SQL query support is that it uses the same Query interface used for JP QL queries. With some small exceptions that will be described later, all the Query interface operations discussed in previous chapters apply equally to both JP QL and SQL queries.

keep application code consistent because it needs to concern itself only with the EntityManager and Query interfaces.

An unfortunate result of adding the TypedQuery interface in JPA 2.0 is that the createNativeQuery() method was already defined in JPA 1.0 to accept a SQL string and a result class and return an untyped Query interface

consequence is that when the createNativeQuery() method is called with a result class argument one might mistakenly think it will produce a TypedQuery, like createQuery() and createNamedQuery() do when a result class is passed in.

@NamedNativeQuery

resultClass=Employee.class

The fact that the named query was defined using SQL instead of JP QL is not important to the caller

SQL Result Set Mapping

JPA provides SQL result set mappings to handle these scenarios

A SQL result set mapping is defined using the @SqlResultSetMapping annotation. It may be placed on an entity class and consists of a name (unique within the persistence unit) and one or more entity and column mappings.

entities=@EntityResult(entityClass=Employee.class)

@SqlResultSetMapping

Multiple Result Mappings

A query may return more than one entity at a time

The SQL result set mapping to return both the Employee and Address entities out of this query

emp_id, name, salary, manager_id, dept_id

address_id, id, street, city, state, zip

order in which the entities are listed is not important

ntities={@EntityResult(entityClass=Employee.class), @EntityResult(entityClass=Address.class)}

summary of templates used by the generator depending on the kind of Java class it encounters:

these templates are bundled in the granite-generator.jar archive, in the org.granite.generator.template package and accessible as resources via the class loader

class: protocol is used because all standard templates are available in the classpath

Alternatively, you may use the file: protocol to load your template from the filesystem. These templates can be specified either by using absolute paths (eg. file:/absolute/path/to/mytemplate.gsp) or paths relative to your current Eclipse project root directory (eg. path/to/mytemplate.gsp).

ActionScript 3 generator is able to write AS3 typed client proxies for exposed remote services

Compared to the usual Flex RemoteObject, this can greatly help development by bringing

in Flex when using remote services.

replicate validation annotations in order to use the Flex side validation framework

 Known Limitations

Gas3 does not support inner classes

must declare your classes in separated source files if you want them to be correctly handled by the generator

services-config.xml

define manually the endpoint for remote services

service initializer in a static block of the main mxml file

Cdi.getInstance().addComponentWithFactory("serviceInitializer", DefaultServiceInitializer, { contextRoot: "/my-cdi-app" } );

tideAnnotations

GraniteDS validation framework provides a set of standard constraints

Constraint Description AssertFalse The annotated element must be false AssertTrue The annotated element must be true DecimalMax The annotated element must be a number whose value must be lower or equal to the specified maximum DecimalMin The annotated element must be a number whose value must be greater or equal to the specified minimum Digits The annotated element must be a number whithin accepted range Future The annotated element must be a date in the future Max The annotated element must be a number whose value must be lower or equal to the specified maximum Min The annotated element must be a number whose value must be greater or equal to the specified minimum NotNull The annotated element must not be null Null The annotated element must be null Past The annotated element must be a date in the past Pattern The annotated String must match the supplied regular expression Size The annotated element size must be between the specified boundaries (included)

must use

Note that the bundle name must always be set to "ValidationMessages".

3 separate projects: a Java project, a Flex project and a Webapp project.

GraniteDS archetypes

archetypeGroupId: org.graniteds.archetypes archetypeVersion: 1.1.0.GA archetypeArtifactId:

Maven 3.x required

mvn archetype:generate    -DarchetypeGroupId=org.graniteds.archetypes    -DarchetypeArtifactId=graniteds-tide-spring-jpa-hibernate    -DarchetypeVersion=1.1.0.GA    -DgroupId=org.example    -DartifactId=springgds    -Dversion=1.0-SNAPSHOT

cd springgdsmvn clean package

build the project

CDI archetype requires a Java EE 6 server and uses an embedded GlassFish

cd webappmvn embedded-glassfish:run

With the Eclipse Maven integration (the M2E plugin), you can simply choose one of the archetypes when doing New Maven Project.

mvn war:war

two very easy ways to quickly create a new GraniteDS project