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Hendy Irawan

Apache Commons Daemon : Java based daemons or services - 0 views

commons.apache.org/daemon

JAVA daemon library APACHE service unix windows programming

shared by Hendy Irawan on 12 Aug 11 - Cached
  • Hendy Irawan on 12 Aug 11
     
    "Since 1994, the Java programming language evolved and became a valid tool to develop reliable and performant server applications as opposed to just applets and client applications. The major disadvantage of the Java platform is that still today the only portable way to start a Java application relies on a single point of entry: the public static void main(String[]) method. Having a single-point of entry is a valid solution for client applications, where interactively a user can command to the application to quit (which can terminate the Virtual Machine process at calling the System.exit(int) method), but in those cases where the application is not interactive (server applications) there is currently no portable way to notify the Virtual Machine of its imminent shutdown. A server application written in Java might have to perform several tasks before being able to shutdown the Virtual Machine process. For example in the case of a Servlet container, before the VM process is shut down, sessions might need to be serialized to disk, and web applications need to be destroyed. One common solution to this problem is to create (for example) a ServerSocket and wait for a particular message to be issued. When the message is received, all operations required to shut down the server applications are performed and at the end the System.exit method is called to terminate the Virtual Machine process. This method however, has several disadvantages and risks: In case of a system-wide shutdown, the Virtual Machine process may be shut down directly by the operating system without notifying the running server application. If an attacker finds out the shutdown message to send to the server and discovers a way to send this message, he can easily interrupt the server's operation, bypassing all the security restrictions implemented in the operating system. Most multi-user operating systems already have a way in which server applications are started and stopped. Under Unix based
Davor Poldrugo

The ASF Resigns From the JCP Executive Committee - 0 views

blogs.apache.org/...the_asf_resigns_from_the

java news apache development opensource

shared by Davor Poldrugo on 13 Dec 10 - No Cached
  • Oracle provided the EC with a Java SE 7 specification request and license that are self-contradictory, severely restrict distribution of independent implementations of the spec, and most importantly, prohibit the distribution of independent open source implementations of the spec.  Oracle has refused to answer any reasonable and responsible questions from the EC regarding these problems.
  • In the phrase "fail to uphold their responsibilities under the JSPA", we are referring to Oracle's refusal to provide the ASF's Harmony project with a TCK license for Java SE that complies with Oracle's obligations under the JSPA as well as public promises made to the Java community by officers of Sun Microsystems (recently acquired by Oracle.)
  • it should be noted that the majority of the EC members, including Oracle, have publicly stated that restrictions on distribution such as those found in the Java SE 7 license have no place in the JCP - and two distinguished individual members of the EC, Doug Lea and Tim Peierls, both have resigned in protest over the same issue.
  • ...9 more annotations...
  • By approving Java SE 7, the EC has failed on both counts : the members of the EC refused to stand up for the rights of implementers, and by accepting Oracle's TCK license terms for Java SE 7, they let the integrity of the JCP's licensing structure be broken.
  • The Apache Software Foundation concludes that that JCP is not an open specification process
  • and finally, the EC is unwilling or unable to assert the basic power of their role in the JCP governance process
  • In short, the EC and the Java Community Process are neither.
  • To that end, our representative has informed the JCP's Program Management Office of our resignation, effective immediately.  As such, the ASF is removing all official representatives from any and all JSRs. In addition, we will refuse any renewal of our JCP membership and, of course, our EC position.
  • Okay ! Java's privatized now... What now ?
  • Thank god I moved off Java in time. Suddenly Oracle is the new Death Star, replacing Microsoft.
  • This is a sad, sad day in the Java community. I hoped that Oracle would back-peddle and realize the folly of their ways. Now Java will be to Oracle what .NET is to Microsoft and it will be the death of Java as we know it.
  • Posibly in few years we'll see Apache as a new Sun for "Java", followed by Eclipse, Google, etc... I hope this is a great movement done by Apache for the community. We'll see... The objetive of Oracle are Enterprises that cannot move from Java because of hight investments, it will earn a lot of money from them. Oracle ignores the community because is not going to pay for (expensive, as all the rest of Oracle products) licenses... We'll se...
  • Davor Poldrugo on 13 Dec 10
     
    The Apache Software Foundation has resigned its seat on the Java SE/EE Executive Committee. Apache has served on the EC for the past 10 years, winning the JCP "Member of the Year" award 4 times, and recently was ratified for another term with support from 95% of the voting community. Further, the project communities of the ASF, home to Apache Tomcat, Ant, Xerces, Geronimo, Velocity and nearly a 100 mainstay java components have implemented countless JSRs and serve on and contribute to many of the JCPs technical expert groups. We'd like to provide some explanation to the community as to why we're taking this significant step.
anonymous

Getting Started with RequestFactory - Google Web Toolkit - Google Code - 0 views

code.google.com/...DevGuideRequestFactory.html

shared by anonymous on 10 Jan 11 - No Cached
  • Entity Proxies
    • anonymous
      anonymous on 10 Jan 11
       
      Proxy type (on the Client) vs Entity type (on the server)
  • proxy types
  • entity types
  • ...147 more annotations...
  • methods that return service stubs
  • one RequestFactory interface for your application
  • employeeRequest();
  • @Service(Employee.class)
  • extends RequestContext
  • extends RequestFactory
  • service stub
  • RequestFactory service stubs
  • must extend RequestContext
  • The methods in a service stub do not return entities directly
  • return subclasses of com.google.gwt.requestfactory.shared.Request.
  • This allows the methods on the interface to be invoked asynchronously with
  • Request.fire()
  • fire(    new Receiver()
  • onSuccess
  • callers pass an AsyncCallback that implements onSuccess()
  • takes a Receiver which must implement onSuccess()
  • Receiver is an abstract class having a default implementation of onFailure()
  • you can extend Receiver and override onFailure()
  • onViolation()
  • any constraint violations on the server
  • The Request type returned from each method
  • parameterized with the return type of the service method.
  • Methods that have no return value should return type Request<Void>
  • BigDecimal, BigInteger, Boolean, Byte, Enum, Character, Date, Double, Float, Integer, Long, Short, String, Void
  • subclass of EntityProxy
  • List<T> or Set<T>
  • primitive types are not supported
  • methods that operate on an entity itself
  • like persist() and remove()
  • return objects of type InstanceRequest rather than Reques
  • Server Implementations
  • methods defined in an
  • entity's service interface
  • implemented in the class named
  • @Service annotation
  • in these examples, is the entity class
  • service implementations do not directly implement the RequestContext interface
  • server-side implementations use the domain entity types
  • @Entity
  • EntityManager
  • createQuery
  • getResultList();
  • entityManager()
  • createEntityManager()
  • em.persist(this);
  • em.remove(attached
  • em.close();
  • defined in the service's
  • RequestContext interface
  • even though the implementation does not formally implement the interface in Java
  • name and argument list for each method
  • same on client and server
  • Client side methods
  • return Request<T>
  • only T on the server
  • EntityProxy types become the domain entity type on the server
  • Methods that return a Request object in the client interface are implemented as static methods on the entity
  • Methods that operate on a single instance of an entity, like persist() and remove(),
  • eturn an
  • InstanceRequest
  • in the client interface
  • Instance methods do not pass the instance directly, but rather via the
  • using()
  • instance methods must be implemented as non-static methods in the entity type
  • Four special methods are required on all entities
  • as they are used by the RequestFactory servlet:
  • constructor
  • findEntity
  • An entity's getId()
  • is typically auto-generated by the persistence engine (JDO, JPA, Objectify, etc.)
  • "find by ID" method has a special naming convention
  • find()
  • "find" plus the type's simple name
  • On the server
  • getVersion() method is used by RequestFactory to infer if an entity has changed
  • backing store (JDO, JPA, etc.) is responsible for updating the version each time the object is persisted,
  • RequestFactoryServlet sends an UPDATE
  • if an entity changes as
  • Second, the client maintains a version cache of recently seen entities
  • Whenever it sees an entity whose version has changed, it fires
  • UPDATE events on the event bus
  • so that listeners can update the view
  • GWT.create
  • and initialize it with your application's EventBus
  • GWT.create
  • requestFactory.initialize
  • create a new entity on the client
  • EmployeeRequest request
  • EmployeeProxy newEmployee
  • All client-side code should use the EmployeeProxy
  • not the Employee entity itself
  • unlike GWT-RPC, where the same concrete type is used on both client and server
  • RequestFactory
  • designed to be used with an ORM layer like JDO or JPA
  • on the server
  • to build data-oriented (CRUD) apps with an ORM-like interface
  • on the client
  • easy to implement a data access layer
  • structure your server-side code in a data-centric way
  • GWT-RPC, which is service-oriented
  • On the client side, RequestFactory keeps track of objects that have been modified and sends only changes
  • lightweight network payloads
  • solid foundation for automatic batching and caching of requests in the future
  • RequestFactoryServlet
  • RequestFactory uses its own servlet
  • own protocol
  • not designed for general purpose services like GWT-RPC
  • implements its
  • It is designed specifically for implementing a persistence layer on both client and server.
  • In persistence frameworks like JDO and JPA, entities are annotated with
  • client-side representation of an entity
  • known as a
  • DTO (Data Transfer Object)
  • hook used to indicate that an object can be managed by RequestFactory
  • RequestFactory
  • EntityProxy interface
  • automatically populates bean-style properties between entities on the server and the corresponding EntityProxy on the client,
  • send only changes ("deltas") to the server
  • extends EntityProxy
  • interface
  • @ProxyFor
  • reference the server-side entity being represented
  • It is not necessary to represent every property and method from the server-side entity in the EntityProxy
  • EntityProxyId returned by this method is used throughout RequestFactory-related classes
  • while getId() is shown in this example, most client code will want to refer to
  • EntityProxy.stableId() i
  • to represent any type
  • is not required to expose an ID and version
  • often used to represent embedded object types within entities
  • @Embedded
  • Address
  • Address type
  • POJO with no persistence annotations
  • Address is represented as a ValueProxy
  • extends ValueProxy
  • interface
  • extends EntityProxy
  • interface
  • AddressProxy
  • AddressProxy
  • ValueProxy can be used to pass any type to and from the server
  • RequestFactory
  • interface between your client and server code
  • RequestContext interface
  • The server-side service
  • must implement each method
Hendy Irawan

Sapphire - 0 views

www.eclipse.org/sapphire

sapphire eclipse RCP java development UI AWT Swing swt

shared by Hendy Irawan on 30 Mar 11 - No Cached
  • Hendy Irawan on 30 Mar 11
     
    Sapphire - develop UI without wiring individual widgets Little has changed in the way Java desktop UI is written since the original Java release. Technologies have changed (AWT, Swing, SWT, etc.), but fundamentals remain the same. The developer must choose which widgets to use, how to lay those widgets out, how to store the data being edited and how to synchronize the model with the UI. Even the best developers fall into traps of having UI components talk directly to other UI components rather than through the model. Inordinate amount of time is spent debugging layout and data-binding issues. Sapphire aims to raise UI writing to a higher level of abstraction. The core premise is that the basic building block of UI should not be a widget (text box, label, button, etc.), but rather a property editor. Unlike a widget, a property editor analyzes metadata associated with a given property, renders the appropriate widgets to edit that property and wires up data binding. Data is synchronized, validation is passed from the model to the UI, content assistance is made available, etc. This fundamentally changes the way developers interact with a UI framework. Instead of writing UI by telling the system how to do something, the developer tells the system what they intend to accomplish. When using Sapphire, the developer says "I want to edit LastName property of the person object". When using widget toolkits like SWT, the developer says "create label, create text box, lay them out like so, configure their settings, setup data binding and so on". By the time the developer is done, it is hard to see the original goal in the code that's produced. This results in UI that is inconsistent, brittle and difficult to maintain.
Hendy Irawan

Equinox Aspects - 0 views

www.eclipse.org/...aspects

equinox aspects java eclipse aspectj weave weaving aspect aop osgi

shared by Hendy Irawan on 18 Oct 10 - Cached
  • Hendy Irawan on 18 Oct 10
     
    Aspect-oriented computing is continuing to increase in popularity. The modularity inherent in OSGi and Eclipse offers unique opportunities for managing and applying aspects by supplying them in bundles and directing their application to particular sets of bundles. This incubator work area is dedicated to delivering an integration of aspects and OSGi. The goal is to allow developers to use the Equinox together with AspectJ by combining the benefits of both worlds. Using a load-time weaving extension you are able to add AspectJ aspects to your bundle-based system just by putting them into general OSGi bundles. It does not matter if the pointcuts you defined inside the aspects contain join points that are defined by classes within the same bundle or any other bundle in your installation. The load-time weaving extension will take care that your aspects are woven with the appropriate classes at load-time. To illustrate this lets assume the following situation: You would like to write an aspect that traces something within the JDT plug-ins of Eclipse. Without some kind of load-time aspect weaving you would somehow need to recompile those JDT plug-ins using AJDT (for example) together with your aspect. By using the load-time aspect weaving extension all you need is to implement your aspect and add that bundle to your system. The load-time aspect weaving extension takes care of weaving your aspect with the JDT code as it is loaded. And it doesn't matter if a new JDT is installed by the user later on. The next time your application is started the load-time aspect weaving will take care of weaving your aspect into these bundles as well, if necessary. With this technology is becomes possible to modularize crosscutting concerns across different plug-ins while keeping the idea of separate compilation for bundles. Goals Provide Runtime Modularity and Versioning for Crosscutting Concerns: Aspects are used to implement crosscutting concerns. However such concerns usually compr
anonymous

Organize Projects - Google Web Toolkit - Google Code - 0 views

code.google.com/...evGuideOrganizingProjects.html

shared by anonymous on 14 Jan 11 - Cached
  • com.google.gwt.gears.Gears
    • anonymous
      anonymous on 14 Jan 11
       
      Gears.gwt.xml does not define andy entry point. It can only be inherits
  • two ways to approach loading them
  • nclude each module with a separate <script> tag
  • ...118 more annotations...
  • Create a top level module XML definition
  • Compile the top level module
  • the second approach will lead to much better end-user performance
  • each module has to be downloaded separately by the end-user's browser
  • each module will contain redundant copies of GWT library
  • conflict with each other during event handling
  • Linkers are divided into three categories, PRE, POST, and PRIMARY
  • one primary linker is run for a compilation
  • everal linkers are provided by Core.gwt.xml, which is automatically inherited by User.gwt.xml.
  • monolithic JavaScript file.
  • cross-site deployment model.
  • standard iframe-based
  • <add-linker name="xs" />
  • The GWT compiler
  • packaging its output with the Linker subsystem
  • responsible for the final packaging of the JavaScript code
  • providing a pluggable bootstrap mechanism
  • re-use an existing Java API for a GWT project,
  • <super-source>
  • "re-root" a source path
  • to emulate part of the JRE not implemented by GWT
  • tells the compiler to add all subfolders of com/example/myproject/jre/
  • to the source path
  • com/google/myproject/gwt/jre/java/util/UUID.java
  • most commonly used elements in the module XML file.
  • <inherits name="
  • herits all the settings from the specified module
  • <entry-point class=
  • Entry points are all compiled into a single codebase
  • when the onModuleLoad() of your first entry point finishes, the next entry point is called immediately.
  • Any number of entry-point classes can be added
  • <source path="
  • resources get copied into the output directory during a GWT compile.
  • client subpackage is implicitly added to the source path
  • <public path="path" />
  • treated as a publicly-accessible resource.
  • resources get copied into the output directory
  • the public subpackage is implicitly added to the public
  • <servlet
  • For RPC, this element loads a servlet class
  • mounted at the specified URL path
  • path=
    • anonymous
      anonymous on 14 Jan 11
       
      monting location
  • class="
    • anonymous
      anonymous on 14 Jan 11
       
      Which servlet class
  • URL path should be absolute
  • @RemoteServiceRelativePath attribute
  • you must configure a WEB-INF/web.xml in your war directory to load any servlets needed.
  • n development mode,
  • <script src="
  • external JavaScrip
  • <stylesheet src="
  • Extends the set of values
  • for an existing client property
  • <replace-with-class>
  • <generate-with-class>
  • <when-property-is
  • three different types of predicates are
  • <when-type-assignable
  • <when-type-is
  • <all>
  • <any>
  • <none>
  • GWT libraries are organized into modules
  • you want to inherit at least the User module
  • contains all the core GWT functionality
  • including the EntryPoint class
  • widgets and panels
  • History feature
  • Internationalization
  • DOM programming, and more
  • Low-level HTTP
  • Use the following syntax to cause an external JavaScript file to be loaded
  • before your module entry point is called.
  • as if you had included it explicitly using the HTML <script
  • loaded before your onModuleLoad() is called.
  • all included scripts will be loaded when your application starts, in the order in which they are declared.
  • associate external CSS files with your module
  • GWT.getModuleBaseURL() + "foo.css" in client code
  • module's public path
  • useful when
  • inheritance makes resource inclusion particularly convenient.
  • If you wish to create a reusable library that relies upon particular stylesheets or JavaScript files, you can be sure that clients
  • see the documentation for FileSet for a general overview
  • <public>
  • <super-source>
  • <source>
  • includes
  • excludes
  • defaultexcludes
  • casesensitive
  • By default, the patterns listed here are excluded.
  • defaultexcludes is true
  • <script src='myApp/myApp.nocache.js'></script>
  • <script> tags always block evaluation of the page
  • <img> tags do not block page evaluation
  • two simultaneous connections
  • The body.onload() event will only fire once all external resources are fetched, including images and frames.
  • GWT selection script
  • like a normal script tag
  • but the compiled script will be fetched asynchronously.
  • Parsing is blocked until externalScriptZero.js is done fetching and evaluating.
  • myApp/myApp.nocache.js completes
  • the compiled scrip
  • (<hashname>.cache.html
  • begins fetching in a hidden IFRAME (this is non-blocking).
  • onModuleLoad() is not called yet, as we're still waiting on externalScriptOne.js
  • body.onload() fires
  • onload='alert("w00t!")
    • anonymous
      anonymous on 14 Jan 11
       
      is the last line executed
  • put the GWT selection script as early as possible
  • because it won't block any other script requests
  • <img> tags are not guaranteed to be done loading when onModuleLoad() is called
  • <script> tags are guaranteed to be done loading when onModuleLoad() is called
  • multiple EntryPoints
  • will all be called in sequence as soon as that module (and the outer document) is ready
  • multiple GWT modules within the same page
  • each module's EntryPoint will be called as soon as both that module and the outer document is ready
  • EntryPoints are not guaranteed to fire at the same time
  • or in the same order
  • in which their selection scripts were specified in the host page
Hendy Irawan

HowToConfigureExtendedWADL - Jersey: RESTful Web services made easy - wikis.sun.com - 0 views

wikis.sun.com/...HowToConfigureExtendedWADL

restful web jersey howtoconfigureextendedwadl wadl glassfish webservices jax

shared by Hendy Irawan on 04 Apr 11 - No Cached
  • Hendy Irawan on 04 Apr 11
     
    "This page describes how you can get an extended WADL from your REST app. It aligns mostly with the extended-wadl-webapp sample and uses these features: Add additional doc tags to the WADL Create JAXB beans from xsd - you might also create the schema from your beans Add the grammars element that includes the xsd file from which JAXB beans were generated to the WADL Add javadoc from your resource classes to the WADL, using most of the supported javadoc tags For getting the extended WADL as described above these things have to be done: Configure the maven-jaxb-plugin to create JAXB beans from xsd - this is described here just to describe what's done in the sample. Add the application-doc.xml and application-grammars.xml to the build classpath Configure the maven-javadoc-plugin with the ResourceDoclet provided by the wadl-resourcedoc-doclet artifact to create the resource-doc.xml. Create a subclass of WadlGeneratorConfig that defines/configures the WadlGenerators to use Specify your custom WadlGeneratorConfig in the web.xml as the WadlGeneratorConfig"
anonymous

1. Working with Spring Data Repositories - 0 views

docs.spring.io/...repositories.html

java Spring Data

shared by anonymous on 29 Oct 13 - No Cached
  • Typically, your repository interface will extend Repository, CrudRepository or PagingAndSortingRepository. Alternatively, if you do not want to extend Spring Data interfaces, you can also annotate your repository interface with @RepositoryDefinition
  • It allows quick query definition by method names but also custom-tuning of these queries by introducing declared queries as needed.
  • CREATE_IF_NOT_FOUND (default)CREATE_IF_NOT_FOUND combines CREATE and USE_DECLARED_QUERY.
  • ...21 more annotations...
  • the first By acts as delimiter to indicate the start of the actual criteria
  • The mechanism strips the prefixes find…By, read…By, and get…By from the method and starts parsing the rest of it
  • you can define conditions on entity properties and concatenate them with And and Or
  • The introducing clause can contain further expressions such as a Distinct to set a distinct flag
  • List<Person> findByEmailAddressAndLastname(EmailAddress emailAddress, String lastname); // Enables the distinct flag for the query List<Person> findDistinctPeopleByLastnameOrFirstname(String lastname, String firstname); List<Person> findPeopleDistinctByLastnameOrFirstname(String lastname, String firstname); // Enabling ignoring case for an individual property List<Person> findByLastnameIgnoreCase(String lastname); // Enabling ignoring case for all suitable properties List<Person> findByLastnameAndFirstnameAllIgnoreCase(String lastname, String firstname); // Enabling static ORDER BY for a query List<Person> findByLastnameOrderByFirstnameAsc(String lastname); List<Person> findByLastnameOrderByFirstnameDesc(String lastname);
  • You can combine property expressions with AND and OR. You also get support for operators such as Between, LessThan, GreaterThan, Like for the property expressions
  • AllIgnoreCase
  • IgnoreCase
  • The resolution algorithm starts with interpreting the entire part (AddressZipCode) as the property and checks the domain class for a property with that name (uncapitalized). If the algorithm succeeds it uses that property. If not, the algorithm splits up the source at the camel case parts from the right side into a head and a tail and tries to find the corresponding property, in our example, AddressZip and Code.
  • he infrastructure will recognize certain specific types like Pageable and Sort to apply pagination and sorting to your queries dynamically
  • Pageable
  • Sort sort
  • The first method allows you to pass an org.springframework.data.domain.Pageable instance to the query method to dynamically add paging to your statically defined query. Sorting options are handled through the Pageable instance too
  • <repositories base-package="com.acme.repositories" />
  • Spring is instructed to scan com.acme.repositories and all its subpackages for interfaces extending Repository or one of its subinterfaces. For each interface found, the infrastructure registers the persistence technology-specific FactoryBean to create the appropriate proxies that handle invocations of the query methods. Each bean is registered under a bean name that is derived from the interface name, so an interface of UserRepository would be registered under userRepository
  • This postfix defaults to Impl.Example 1.12. Configuration example<repositories base-package="com.acme.repository" /> <repositories base-package="com.acme.repository" repository-impl-postfix="FooBar" />The first configuration example will try to look up a class com.acme.repository.UserRepositoryImpl to act as custom repository implementation, where the second example will try to lookup com.acme.repository.UserRepositoryFoo
  • To exclude an interface that extends Repository from being instantiated as a repository instance, you can either annotate it with @NoRepositoryBean or move it outside of the configured base-package.
  • ]In general, the integration support is enabled by using the @EnableSpringDataWebSupport annotation in your JavaConfig configuration class.
  • @Configuration @EnableWebMvc @EnableSpringDataWebSupport class WebConfiguration { }
  • In case you need multiple Pageables or Sorts to be resolved from the request (for multiple tables, for example) you can use Spring's @Qualifier annotation to distinguish one from another
  • Spring HATEOAS ships with a representation model class PagedResources that allows enrichting the content of a Page instance with the necessary Page metadata as well as links to let the clients easily navigate the pages.
anonymous

Large scale application development and MVP - Part II - Google Web Toolkit - Google Code - 0 views

code.google.com/...mvp-architecture-2.html

shared by anonymous on 18 Jan 11 - Cached
  • itself
    • anonymous
      anonymous on 18 Jan 11
       
      The View Implementation
  • @UiHandler("
  • presenter.onAddButtonClicked();
  • ...91 more annotations...
  • onAddButtonClicked
  • eventBus.fireEvent(new AddContactEvent());
  • presenter needs to know more about the view
  • view needs to know more about the data model
  • data types are typically homogeneous within column borders
  • ColumnDefinition abstract class
  • houses the any type-specific code (this is the third party mentioned above)
  • ColumnDefinition
  • ColumnDefinition(s) would be created outside of the presenter
  • we can reuse its logic regardless of what view we've attached ourself to
  • update our views such that we can set their ColumnDefinition(s).
  • setColumnDefinitions
  • this.columnDefinitions = columnDefinitions;
  • so that we can pass in
  • a mocked ContactsView instance when testing our ContactsPresenter
  • in our AppController, when we create the ContactsView,
  • new ContactsViewColumnDefinitions().getColumnDefinitions();
  • we can initialize it with the necessary ColumnDefinition(s).
  • contactsView.setColumnDefiniions(
    • anonymous
      anonymous on 19 Jan 11
       
      Initialize ContactsView with the necessary ColumnDefinition(s)
  • With our ColumnDefinition(s) we can pass the model untouched.
  • As mentioned above we were previously dumbing down the model into a list of Strings
  • current solution
  • List<String> data
  • display.setData(data);
  • how that data type is rendered.
  • use generics
  • third party that abstracts
  • knowledge of a cell's data type
  • stringing together a list of these classes
  • providing the necessary render()
  • and isClickable()/isSelectable() override
  • ContactsViewColumnDefinitions<ContactDetails>
  • columnDefinitions =      new ArrayList<ColumnDefinition<ContactDetails>>()
  • ColumnDefinition<T>
  • ContactsPresenter
  • ContactsViewImpl
  • ColumnDefinition<T> columnDefinition = columnDefinitions.get(j);
  • the presenter can pass the model untouched
  • the view has no rendering code
  • that we would otherwise need to test. And the fun doesn't stop there.
  • presenter.onItemClicked(
  • presenter.onItemSelected
  • ClickEvent
  • cell.getCellIndex()
  • columnDefinition.isClickable()
  • SelectEvent
  • columnDefinition.isSelectable()
  • return shouldFireClickEvent;
  • return shouldFireSelectEvent;
  • respond to user interaction in different ways based upon the cell type that was clicked
  • use them for rendering purposes
  • defining how to interpret user interactions
  • we're going to remove any application state from the ContactsView
  • replace the view's getSelectedRows() with a SelectionModel
  • The SelectionModel is nothing more than a wrapper around a list of model objects.
  • ContactsPresenter holds on to an instance of this class
  • onItemSelected
  • Having the ColumnDefinition create a new widget for each cell is too heavy
  • Replace our FlexTable implementation with an HTML widget
  • calling setHTML()
  • Reduce the event overhead by sinking events on the HTML widget
  • rather than the individual cells
  • update our ContactsView.ui.xml file to use a
  • HTML widget rather than a FlexTable widget.
  • <g:HTML ui:field="contactsTable">
  • Inefficiencies related to inserting new elements via DOM manipulation Overhead associated with sinking events per Widget
  • for each item ask our column definitions to render accordingly
  • each column definition
  • render itself into the StringBuilder
  • rather than passing back a full-on widget
  • calling setHTML on a HTML widget
  • rather than calling setWidget on a FlexTable.
  • This will decrease your load time, especially as your tables start to grow.
  • we're reducing the overhead of sinking events on per-cell widgets
  • instead sinking on a single container
  • ClickEvents are still wired up via our UiHandler annotations
  • get the Element that was clicked on
  • and walk the DOM until we find a parent TableCellElement
  • we can determine the row
  • shouldFirdClickEvent() and shouldFireSelectEvent()
  • to take as a parameter a TableCellElement rather than a HTMLTable.Cell.
  • faster startup times via Code Splitting.
  • runAsync() points
  • split portion of your code is purely segmented
  • not referenced by other parts of the app
  • it will be downloaded and executed at the point that it needs to run
  • Do we really want to download all of that code before the user even logs in?
  • Not really.
  • simply grab the login code, and leave the rest for when we actually need it
  • wrap the code that creates the ContactsView and ContactsPresenter in a runAsync() call
  • as optimizations such as this one become easier and easier to implement.
Hendy Irawan

Scout/Overview - Eclipsepedia - 0 views

wiki.eclipse.org/Overview

project eclipse framework SDK platform business application overview eclipsepedia scout

shared by Hendy Irawan on 24 Apr 11 - No Cached
  • Hendy Irawan on 24 Apr 11
     
    The goal of the Eclipse Scout project is making it easy to build distributed enterprise applications based on the Eclipse platform. It consists of a runtime framework providing transparent service communication between the client and backend part and is shipped with a rich set of common user interface components. The user interface is not built for a particular rendering technology but it encapsulates the core functionality into a headless model. GUI factories are available for rendering the client model into a particular target UI platform. SWT and Swing are supported out of the box and an AJAX GUI factory could be easily added. Developing Scout applications is supported by the Scout SDK, a plug-in set built on top of Eclipse PDE and Eclipse JDT. The Scout SDK works directly on the bare Java resources and assists the development task by providing an augmented view on the underlying Java code. Additionally, it comes with a rich set of wizards and operations for modifying the Scout application project just by editing the underlying Java code. There is no meta-data required. Hence a developer can switch between editing resources using Eclipse's standard editors and leveraging the features of Scout SDK at any point in time. Eclipse Scout can be used to create multi-tier client/server applications, standalone client applications or OSGi-based server applications. Basically, there are three main advantages when choosing Scout as your framework for building such applications. First, the Scout runtime is service oriented by design. Almost every functionality is provided as an OSGi service. Every OSGi bundle may make use of them. Second, Scout provides a rich set of UI elements being uncoupled from a particular GUI technology. And third, building distributed client/server applications is as easy as if both parts would run within the same local JVM.
Hendy Irawan

6. Validation, Data Binding, and Type Conversion - Spring Framework - 0 views

static.springsource.org/...validation.html

validation data conversion type converter class spring framework

shared by Hendy Irawan on 26 Jan 12 - No Cached
  • Hendy Irawan on 26 Jan 12
     
    "There are pros and cons for considering validation as business logic, and Spring offers a design for validation (and data binding) that does not exclude either one of them. Specifically validation should not be tied to the web tier, should be easy to localize and it should be possible to plug in any validator available. Considering the above, Spring has come up with a Validator interface that is both basic ands eminently usable in every layer of an application. Data binding is useful for allowing user input to be dynamically bound to the domain model of an application (or whatever objects you use to process user input). Spring provides the so-called DataBinder to do exactly that. The Validator and the DataBinder make up the validation package, which is primarily used in but not limited to the MVC framework. The BeanWrapper is a fundamental concept in the Spring Framework and is used in a lot of places. However, you probably will not have the need to use the BeanWrapper directly. Because this is reference documentation however, we felt that some explanation might be in order. We will explain the BeanWrapper in this chapter since, if you were going to use it at all, you would most likely do so when trying to bind data to objects. Spring's DataBinder and the lower-level BeanWrapper both use PropertyEditors to parse and format property values. The PropertyEditor concept is part of the JavaBeans specification, and is also explained in this chapter. Spring 3 introduces a "core.convert" package that provides a general type conversion facility, as well as a higher-level "format" package for formatting UI field values. These new packages may be used as simpler alternatives to PropertyEditors, and will also be discussed in this chapter."
Hendy Irawan

Chapter 6. HTTP Caching - 0 views

hc.apache.org/...caching.html

caching http client apache components library

shared by Hendy Irawan on 14 Apr 11 - No Cached
  • Hendy Irawan on 14 Apr 11
     
    HttpClient Cache provides an HTTP/1.1-compliant caching layer to be used with HttpClient--the Java equivalent of a browser cache. The implementation follows the Decorator design pattern, where the CachingHttpClient class is a drop-in replacement for a DefaultHttpClient; requests that can be satisfied entirely from the cache will not result in actual origin requests. Stale cache entries are automatically validated with the origin where possible, using conditional GETs and the If-Modified-Since and/or If-None-Match request headers. HTTP/1.1 caching in general is designed to be semantically transparent; that is, a cache should not change the meaning of the request-response exchange between client and server. As such, it should be safe to drop a CachingHttpClient into an existing compliant client-server relationship. Although the caching module is part of the client from an HTTP protocol point of view, the implementation aims to be compatible with the requirements placed on a transparent caching proxy. Finally, CachingHttpClient includes support the Cache-Control extensions specified by RFC 5861 (stale-if-error and stale-while-revalidate).
Hendy Irawan

Saga EDA pattern - distributed transaction coordinator manager - SOA patterns - Reserva... - 0 views

soa.dzone.com/...httpwwwrgoarchitectscomnblog20

shared by Hendy Irawan on 06 Jun 12 - Cached
  • Hendy Irawan on 06 Jun 12
     
    "Unfortunately, in a distributed world, SOA or otherwise, it is rarely a good idea to use atomic short lived transactions (see the Cross-Service Transactions anti-pattern in chapter 10 for more details). Indeed, the fact that cross service transactions are discourages is one of the main reasons we would to consider using the Saga pattern in the first place. One of the obvious shortcomings of Sagas is that you cannot perform rollbacks. The two conditions mentioned above, locking and isolation do not hold anymore so you cannot provide the needed guarantee. Still, since interactions, and especially long running ones, can fail or be canceled Sagas offer the notion of Compensations. Compensations are cool; we can't have rollbacks so instead we will reverse the interaction's operation and have a pseudo rollback. If we added one hundred (dollars/units/whatnot) during the original activity we'll just subtract the same 100 in the compensation. Easy, right?"
Rinav G

[JavaSpecialists 177] - Logging Part 3 of 3 - 0 views

www.javaspecialists.eu/...Issue177.html

java javaspecialists logging bestpractices

shared by Rinav G on 17 Sep 10 - No Cached
  • Writing your own logging framework is the perfect coding crime.
  • Writing your own logging framework is the perfect coding crime
  • Even the Sun engineers fell into this trap. Prior to Java 4, we had a perfectly good logging framework in Log4J. However, instead of adopting this into the standard Java distribution, we ended up with java.util.logging. There are lots of Java logging frameworks available, even meta-logging frameworks like SLF4J and Jakarta Commons. These are supposed to abstract the logging frameworks so you can change the implementation without touching your code.
  • ...5 more annotations...
  • Logging Levels
  • In Log4J for example, we have six default levels, FATAL, ERROR, WARNING, INFO, DEBUG and TRACE.
  • Since it is tricky assigning the correct levels in our code, we should regularly do code reviews with specific emphasis on logging levels.
  • We should be able to adjust the log levels of our individual components at runtime without restarting our application.
  • Silent Operation
  • Rinav G on 17 Sep 10
     
    Writing your own logging framework is the perfect coding crime. If you can convince your manager to put it on the project plan, you are guaranteed to have success. At the end of each day, you will go home feeling happy and satisfied. It will feel like you are doing something creative. You will get the intellectual stimulation without the risk of failure. Even the Sun engineers fell into this trap. Prior to Java 4, we had a perfectly good logging framework in Log4J. However, instead of adopting this into the standard Java distribution, we ended up with java.util.logging. There are lots of Java logging frameworks available, even meta-logging frameworks like SLF4J and Jakarta Commons. These are supposed to abstract the logging frameworks so you can change the implementation without touching your code. http://www.javaspecialists.eu/archive/Issue177.html
Hendy Irawan

Arquillian - JBoss Community - 0 views

www.jboss.org/arquillian

jboss arquillian community java embedded jsr299 weld framework seam cdi development programming test testing unit integration

shared by Hendy Irawan on 16 Apr 11 - No Cached
  • Hendy Irawan on 16 Apr 11
     
    Arquillian enables you to test your business logic in a remote or embedded container. Alternatively, it can deploy an archive to the container so the test can interact as a remote client. The mission of the Arquillian project is to provide a simple test harness that abstracts away all container lifecycle and deployment from the test logic so developers can easily produce a broad range of integration tests for their enterprise Java applications. Arquillian is part of the JBoss Testing initiative, an umbrella project focused on providing a comprehensive testing tool set for application developers. Arquillian can either execute a test case inside the container, in which case the test class is deployed by Arquillian along with the code under test, or hold back the test class so it can act as a remote client to the deployed code. All the developer has to do is write the test logic. In short... Arquillian makes integration testing a breeze!
Hendy Irawan

Java Tips - Inheritance and the Java Persistence API - 0 views

www.java-tips.org/...e-and-the-java-persistenc.html

JPA EE web java tips inheritance eclipselink glassfish

shared by Hendy Irawan on 05 Apr 11 - No Cached
  • Hendy Irawan on 05 Apr 11
     
    "This Tech Tip presents some of the features of inheritance supported in the Java Persistence API. A sample package accompanies the Tech Tip. It demonstrates some of the features discussed in the tip. The examples in the tip are taken from the source code for the sample (which is included in the package). The sample uses an open source reference implementation of Java EE 5 called GlassFish. You can download GlassFish from the GlassFish Community Downloads page."
Hendy Irawan

FAQ How do I increase the heap size available to Eclipse? - Eclipsepedia - 0 views

wiki.eclipse.org/p_size_available_to_Eclipse%3F

eclipse faq how java heap the memory size

shared by Hendy Irawan on 12 Apr 11 - Cached
  • Hendy Irawan on 12 Apr 11
     
    Some JVMs put restrictions on the total amount of memory available on the heap. If you are getting OutOfMemoryErrors while running Eclipse, the VM can be told to let the heap grow to a larger amount by passing the -vmargs command to the Eclipse launcher. For example, the following command would run Eclipse with a heap size of 256MB: eclipse [normal arguments] -vmargs -Xmx256M [more VM args] The arguments after -vmargs are directly passed to the VM. Run java -X for the list of options your VM accepts. Options starting with -X are implementation-specific and may not be applicable to all VMs. You can also put the extra options in eclipse.ini.
Hendy Irawan

Discussion on eclipse-repository packaging type clean-up - Tycho - Confluence - 0 views

docs.sonatype.org/...sitory+packaging+type+clean-up

eclipse repository p2 build tycho maven plugin pde rcp update-site

shared by Hendy Irawan on 29 Apr 11 - No Cached
  • Hendy Irawan on 29 Apr 11
     
    The packaging type eclipse-repository was originally introduced for building products that can be updated with p2 (cf. TYCHO-188). This requires the following build results: a p2 repository which contains the product IU, and a zip file with the installed product. (Although this is technically no longer needed since the Update Manager was replaced by p2, zip files are still the primary way to distribute Eclipse/RCP installations.) For ease of implementation, this was done in the same packaging type eclipse-repository. In the meantime, eclipse-repository has gained in capabilities (in particular through TYCHO-491), making it difficult for users to choose the right packaging types. This page lays out the mid-term plan of how we want to build products, update site categories, and p2 repositories in Tycho. It also contains a few details how the transition todays (0.11.0) packaging types (eclipse-repository, eclipse-application, eclipse-update-site) to the new types eclipse-repository and eclipse-product.
Rinav G

JavaBlogging » What is serialVersionUID? - 2 views

www.javablogging.com/what-is-serialversionuid

java Serializable serialVersionUID

shared by Rinav G on 09 Nov 10 - Cached
  • private static final long serialVersionUID = 1L
  • and it is still there even after the program finished. Let’s see if we can read that file once again, this time without creating it first.
  • Now, let’s see what happens, when we change the serialVersionUID value and try to deserialize once again our file. Change the line 2 in the class SerializeMe so that serialVersionUID contains now 2 instead of 1:
  • ...13 more annotations...
  • serialVersionUID = 2L;
  • static final
  • Exception in thread "main" java.io.InvalidClassException:
  • As you can see, this time the deserialization didn’t go well. ObjectInputStream complained about the serialVersionUID being changed.
  • How does he know that it changed? If serialVersinUID is static, then it should not have been serialized in the first place, and there should be no information about the previous value 1 during the deserialization, right? Well, serialVersionUID is an exception to the rule that “static fields don’t get serialized”.
  • Moreover, if there is no serialVersionUID officially declared in the class to be serialized, compiler automatically adds it with a value generated based on the fields declared in the class.
  • The deserialization of that object does not necessarily have to occur exactly after serialization. It can occur after a few months or on a completely different JVM
  • there is a chance that the class declaration has changed between serialization and deserialization.
  • It checks if the data read from the input stream is compatible with the current definition of the class.
  • when the visibility of a field changes, the serialVersionUID changes too.
  • sometimes you just want for some reason to forbid deserialization of old serialized objects,
  • you might tend to write it once for every serializable class ( or have it generated by the IDE ) and forget about it. WRONG !!!
  • If you write it once and don’t take care to update it when necessary, you loose all the merits of serialVersionUID.
  • Rinav G on 09 Nov 10
     
    What is serialVersionUID? What is it Used For???
Hendy Irawan

AtomServer 2.3.4 - - 0 views

atomserver.codehaus.org

atom rest atompub server atomserver webservices 2 Java

shared by Hendy Irawan on 06 Apr 11 - Cached
  • Hendy Irawan on 06 Apr 11
     
    "AtomServer is a generic data store implemented as a RESTful web service. It is designed as a GData-style Atom Store. It is based on the following concepts and protocols; REST. REST is a design pattern. It's not a technology like SOAP or HTTP. REST is a proven design pattern for building loosely-coupled, highly-scalable applications. There are important benefits to sticking to the REST design pattern; Simple. REST is incredibly simple to define. There are just a handful of principles and well defined semantics associated with it. Scalable. REST leads to a very scalable solution by promoting a stateless protocol and allowing state to be distributed across the web. Layered. REST allows any number of intermediaries, such as proxies, gateways, and firewalls. Ultimately REST is just a web site, albeit one that adheres to a design pattern, so one can easily layer aspects such as Security, Compression, etc. on an as needed basis. Atom. Fundamentally, Atom is an XML vocabulary for describing lists of timestamped entries. These entries can be anything, although because Atom was originally conceived to replace RSS, Atom lists are Feeds, and the items in the lists are Entries. Atom is a RESTful protocol. AtomServer stands on the shoulders of giants. It is built on top of several open source projects - most notably, Apache Abdera (a Java-based Atom Publishing framework) and Spring. AtomServer is an Atom Store. Thus, it requires a relational database to run. AtomServer currently supports; PostgresSQL, SQLServer, and HSQLDB. Using HSQLDB, AtomServer requires zero configuration and can run out-of-the-box. While this configuration is suitable for many applications, those that see significant load will likely require a database with better transactional semantics, such as PostgreSQL. AtomServer is easy to use. It deploys as a simple WAR file into any Servlet container. Or alternately, can be used out-of-the-box as a standalone server, running with
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