Entity Proxies
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Spring to Java EE - A Migration Experience | OcpSoft - 0 views
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Does it all make sense now? Do you know how to solve every problem? Probably not, but when it comes right down to it, using Java EE can be even simpler than using Spring, and take much less time. You just have to find the right guides and the right documentation (which is admittedly a severe sore-spot of Java EE; the documentation is still a work in progress, but is getting much better, save blogs like this one.) You have to turn to a vendor like JBoss, or IBM in order to get the use-case driven documentation you need, and they do have documentation, it's just a matter of finding it. Seam 3 in particular strives to give extensive user-documentation, hopefully making things much simpler to adopt, and easier to extend. The main purpose of this article was not to bash Spring, although I may have taken that tone on occasion just for contrast and a little bit of fun. Both Spring and Java EE are strongly engineered and have strong foundations in practical use, but if you want a clean programming experience right out of the box - use Java EE 6 on JBoss Application Server 6 - JBoss Tools - and Eclipse. I will say, though, that the feeling I've gotten from the Spring forums vs the Java EE forums, is that there are far many more people willing to help you work through Java EE issues, and more available developers of the frameworks themselves to actually help you than there are on the Spring side. The community for Java EE is much larger, and much more supportive (from my personal experience.) In the end, I did get my application migrated successfully, and despite these issues (from which I learned a great deal,) I am still happy with Java EE, and would not go back to Spring! But I do look forward to further enhancements from the JBoss Seam project, which continue to make developing for Java EE simpler and more fun. Don't believe me? Try it out. Find something wrong? Tell me. Want more? Let me know what you want to hear.
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Getting Started with RequestFactory - Google Web Toolkit - Google Code - 0 views
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proxy types
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entity types
- ...147 more annotations...
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methods that return service stubs
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one RequestFactory interface for your application
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employeeRequest();
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@Service(Employee.class)
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extends RequestContext
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extends RequestFactory
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service stub
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RequestFactory service stubs
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must extend RequestContext
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The methods in a service stub do not return entities directly
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return subclasses of com.google.gwt.requestfactory.shared.Request.
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This allows the methods on the interface to be invoked asynchronously with
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Request.fire()
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fire( new Receiver()
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onSuccess
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callers pass an AsyncCallback that implements onSuccess()
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takes a Receiver which must implement onSuccess()
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Receiver is an abstract class having a default implementation of onFailure()
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you can extend Receiver and override onFailure()
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onViolation()
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any constraint violations on the server
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The Request type returned from each method
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parameterized with the return type of the service method.
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Methods that have no return value should return type Request<Void>
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BigDecimal, BigInteger, Boolean, Byte, Enum, Character, Date, Double, Float, Integer, Long, Short, String, Void
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subclass of EntityProxy
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List<T> or Set<T>
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primitive types are not supported
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methods that operate on an entity itself
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like persist() and remove()
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return objects of type InstanceRequest rather than Reques
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Server Implementations
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methods defined in an
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entity's service interface
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implemented in the class named
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@Service annotation
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in these examples, is the entity class
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service implementations do not directly implement the RequestContext interface
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server-side implementations use the domain entity types
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@Entity
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EntityManager
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createQuery
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getResultList();
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entityManager()
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createEntityManager()
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em.persist(this);
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em.remove(attached
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em.close();
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defined in the service's
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RequestContext interface
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even though the implementation does not formally implement the interface in Java
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name and argument list for each method
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same on client and server
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Client side methods
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return Request<T>
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only T on the server
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EntityProxy types become the domain entity type on the server
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Methods that return a Request object in the client interface are implemented as static methods on the entity
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Methods that operate on a single instance of an entity, like persist() and remove(),
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eturn an
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InstanceRequest
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in the client interface
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Instance methods do not pass the instance directly, but rather via the
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using()
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instance methods must be implemented as non-static methods in the entity type
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Four special methods are required on all entities
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as they are used by the RequestFactory servlet:
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constructor
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findEntity
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An entity's getId()
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is typically auto-generated by the persistence engine (JDO, JPA, Objectify, etc.)
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"find by ID" method has a special naming convention
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find()
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"find" plus the type's simple name
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On the server
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getVersion() method is used by RequestFactory to infer if an entity has changed
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backing store (JDO, JPA, etc.) is responsible for updating the version each time the object is persisted,
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RequestFactoryServlet sends an UPDATE
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if an entity changes as
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Second, the client maintains a version cache of recently seen entities
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Whenever it sees an entity whose version has changed, it fires
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UPDATE events on the event bus
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so that listeners can update the view
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GWT.create
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and initialize it with your application's EventBus
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GWT.create
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requestFactory.initialize
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create a new entity on the client
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EmployeeRequest request
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EmployeeProxy newEmployee
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All client-side code should use the EmployeeProxy
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not the Employee entity itself
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unlike GWT-RPC, where the same concrete type is used on both client and server
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RequestFactory
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designed to be used with an ORM layer like JDO or JPA
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on the server
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to build data-oriented (CRUD) apps with an ORM-like interface
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on the client
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easy to implement a data access layer
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structure your server-side code in a data-centric way
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GWT-RPC, which is service-oriented
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On the client side, RequestFactory keeps track of objects that have been modified and sends only changes
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lightweight network payloads
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solid foundation for automatic batching and caching of requests in the future
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RequestFactoryServlet
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RequestFactory uses its own servlet
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own protocol
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not designed for general purpose services like GWT-RPC
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implements its
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It is designed specifically for implementing a persistence layer on both client and server.
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In persistence frameworks like JDO and JPA, entities are annotated with
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client-side representation of an entity
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known as a
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DTO (Data Transfer Object)
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hook used to indicate that an object can be managed by RequestFactory
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RequestFactory
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EntityProxy interface
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automatically populates bean-style properties between entities on the server and the corresponding EntityProxy on the client,
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send only changes ("deltas") to the server
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extends EntityProxy
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interface
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@ProxyFor
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reference the server-side entity being represented
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It is not necessary to represent every property and method from the server-side entity in the EntityProxy
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EntityProxyId returned by this method is used throughout RequestFactory-related classes
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while getId() is shown in this example, most client code will want to refer to
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EntityProxy.stableId() i
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to represent any type
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is not required to expose an ID and version
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often used to represent embedded object types within entities
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@Embedded
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Address
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Address type
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POJO with no persistence annotations
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Address is represented as a ValueProxy
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extends ValueProxy
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interface
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extends EntityProxy
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interface
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AddressProxy
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AddressProxy
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ValueProxy can be used to pass any type to and from the server
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RequestFactory
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interface between your client and server code
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RequestContext interface
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The server-side service
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must implement each method
SEO Services that Exceeds Expectations - 1 views
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XOM - 0 views
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XOM™ is a new XML object model. It is an open source (LGPL), tree-based API for processing XML with Java that strives for correctness, simplicity, and performance, in that order.
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dom4j - Introduction - 0 views
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"dom4j is an easy to use, open source library for working with XML, XPath and XSLT on the Java platform using the Java Collections Framework and with full support for DOM, SAX and JAXP. "
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InfoQ: Revving Up Your Hibernate Engine - 1 views
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How to become a Front-end developer in 2019 - 0 views
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Front End Development or Client-Side Development is the practice of coding in technologies like HTML, CSS, and Javascript in a website. The practice involves converting Data into a Graphical Interface for a user to view and interact. Growth in Front-end development is excellent and there are plenteous opportunities available, especially because companies now want their customers to have a good experience while using their Web applications. Want to get hired as a Front End Developer in 2019? Acquire skills in Front End Development, Build live Projects and Get Guaranteed Interviews with edWisor.
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