java/j2ee.persistenceapi/arch.xml

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<!DOCTYPE api-answers PUBLIC "-//NetBeans//DTD Arch Answers//EN" "../../nbbuild/antsrc/org/netbeans/nbbuild/Arch.dtd" [
  <!ENTITY api-questions SYSTEM "../../nbbuild/antsrc/org/netbeans/nbbuild/Arch-api-questions.xml">
]>

<api-answers
  question-version="1.26"
  author="abadea@netbeans.org"
>

  &api-questions;


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            Describe the overall architecture. 
            <hint>
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 <answer id="arch-overall">
  <p>
   This module provides the <api group="java" name="JavaPersistenceAPISupportAPI" type="export" category="friend" url="@TOP@index.html"/> 
   which allows the infrastructure supporting Java Persistence API (JPA) to
   retrieve informatiou about JPA features provided by projects. It mainly
   consists of SPI interfaces which must be implemented by projects and put in
   their default lookups.
  </p>
 </answer>



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   All Javadoc-specified functionality should be covered by unit tests.
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 <answer id="arch-time">
  <p>
   The implementation is done. The target milestone is promo-G.
  </p>
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 <answer id="arch-usecases">
  <p>
   The entry point to the Java Persistence API is the
   <code>persistence.xml</code> file, which contains persistence units.
   Persistence units are logical groupings of entity classes and mapping
   metadata which specifies the mapping of the entity classes to a database.
  </p>
  <usecase id="retrieve-persistence-location" name="Retrieving the default persistence.xml location">
   <p>
    The support for Java Persistence API needs to locate the default location
    for the <code>persistence.xml</code> file in a project and to
    trigger the creation of this location if it doesn't exist. This is
    supported by the <code>PersistenceLocation</code> class. It delegates
    to the <code>PersistenceLocationProvider</code> interface, which is
    supposed to be implemented by projects and put in their lookups.
   </p>
  </usecase>
  <usecase id="retrieve-persistence-scope" name="Retrieving the persistence scope for a file">
   <p>
    The entity classes defined by a <code>persistence.xml</code> file can be
    used by clients, e.g. a servlet or an EJB session bean. It must be possible
    for such as client to find out if there is a <code>persistence.xml</code>
    available and the entity classes defined by its persistence units.
   </p>
   <p>
    For this the concept of a <em>persistence scope</em> was introduced. A
    persistence scope is the grouping of a <code>persistence.xml</code> file
    and a classpath containing entity classes. A persistence scope is described
    by the <code>PersistenceScope</code> class. The
    <code>PersistenceScope.getPersistenceScope(FileObject)</code> method can be
    used to retrieve the persistence scope for a given <code>FileObject</code>.
    This method delegates to the <code>PersistenceScopeProvider</code>, which
    must be implemented by projects and put in their lookups.
   </p>
   <p>
    A <code>PersistenceScope</code> instance is created by implementing the
    <code>PersistenceScopeImplementation</code> interface and passing it to the
    <code>PersistenceScopeFactory.createPersistenceScope()</code> method.
   </p>
  </usecase>
  <usecase id="retrieve-persistence-scopes" name="Retrieving all persistence scopes in a project">
   <p>
    Sometimes it is necessary to retrieve a list of all persistence scopes
    defined by a project and it must be possible to listen for changes to this
    list. This is supported by the <code>PersistenceScopes</code> class. The
    <code>PersistenceScopes.getPersistenceScopes(Project)</code> method can be
    used to retrieve a <code>PersistenceScopes</code> for a given project. This
    method delegates to the <code>PersistenceScopesProvider</code>, which mus
    be implemented by projects and put in their lookups.
   </p>
   <p>
    The <code>PersistenceScopes.getPersistenceScopes()</code> method can be
    used to retrieve an array of <code>PersistenceScope</code>'s. There are
    also methods for adding and removing a <code>PropertyChangeListener</code>
    for listening on the list of persistence scopes.
   </p>
   <p>
    A <code>PersistenceScopes</code> instance is created by implementing the
    <code>PersistenceScopesImplementation</code> interface and passing it to the
    <code>PersistenceScopesFactory.createPersistenceScopes()</code> method.
   </p>
  </usecase>
  <usecase id="implement-persistence-scopes" name="Retrieving all persistence scopes in a project">
   <p>
    To help a project implement <code>PersistenceScopesProvider</code> easily
    the <code>PersistenceScopesHelper</code> class is provided. It supports
    managing a <code>PersistenceScope</code> and listening to the respective
    <code>persistence.xml</code> file and sending property change events
    accordingly.
   </p>
  </usecase>
  <usecase id="implement-persistence-scopes" name="Retrieving all entity classes in a project">
   <p>
    The support for Java Persistence API needs to retrieve the entity classes
    defined in a project.  A project can serve as a class library containing
    entity classes for other projects which does not contain a
    <code>persistence.xml</code> itself, thus it doesn't provide any
    <code>PersistenceScope</code>'s.  This is solved by the
    <code>PersistenceClassPathProvider</code> inteface, which returns a
    classpath containing entity classes.
   </p>
  </usecase>
 </answer>



<!--
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            </hint>
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 <answer id="arch-what">
  <p>
   This module provides APIs needed by the infrastructure supporting Java Persistence API
   to locate the persistence features provided by projects.
  </p>
 </answer>



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  <defaultanswer generate='here' />
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 <answer id="compat-i18n">
  <p>
   The module does not contain any UI, so it does not need to be internationalized.
  </p>
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   The module does not define nor implement any standards.
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 <answer id="compat-version">
  <p>
   The module does not save nor read any settings.
  </p>
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 <answer id="dep-jre">
  <p>
   The module requires JRE 1.4.
  </p>
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 <answer id="dep-jrejdk">
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   JRE is enough.
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  <p>
   The module does not depend on any projects outside NetBeans.
  </p>
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  <p>
   The module should run in the samy way on all platforms.
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 <answer id="deploy-dependencies">
  <p>
   Only friend modules can declare a dependency on this module.
  </p>
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  <p>
   Just the module JAR needs to be deployed.
  </p>
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  <p>
   Yes.
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 <answer id="deploy-packages">
  <p>
   Only API packages are exported, and only to the friend modules.
  </p>
 </answer>



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 <answer id="deploy-shared">
  <p>
   Anywhere.
  </p>
 </answer>



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 <answer id="exec-ant-tasks">
  <p>
   No.
  </p>
 </answer>



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  <p>
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 <answer id="exec-component">
  <p>
   No.
  </p>
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 <answer id="exec-introspection">
  <p>
   No.
  </p>
 </answer>



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 <answer id="exec-privateaccess">
  <p>
   No.
  </p>
 </answer>



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 <answer id="exec-process">
  <p>
   No.
  </p>
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 <answer id="exec-property">
  <p>
   No.
  </p>
 </answer>



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 <answer id="exec-reflection">
  <p>
   No.
  </p>
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 <answer id="exec-threading">
  <p>
   The API is thread-safe. Events are fired synchronously.
  </p>
 </answer>



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 <answer id="format-clipboard">
  <p>
   None.
  </p>
 </answer>



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 <answer id="format-dnd">
  <p>
   None.
  </p>
 </answer>



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 <answer id="format-types">
  <p>
   The module does not read or write any files.
  </p>
 </answer>



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 <answer id="lookup-lookup">
  <api group="lookup" name="org.netbeans.modules.j2ee.persistence.spi.PersistenceScopeProvider" 
       type="export" category="friend">
   <p>
    Implementations of <code>PersistenceScopeProvider</code> are searched for in the
    default lookup and delegated to until one is found which returns a non-null value.
   </p>
  </api>
 </answer>



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 <answer id="lookup-register">
  <api group="lookup" name="org.netbeans.modules.j2ee.persistence.spi.PersistenceScopeProvider" 
       type="import" category="friend">
   <p>
    An implementation of the <code>PersistenceScopeProvider</code> interface
    delegating to the project which owns the <code>FileObject</code> passed to
    the <code>findPersistenceScope()</code> method is registered in the default
    lookup using META-INF/services.
   </p>
  </api>
 </answer>



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 <answer id="lookup-remove">
  <p>
   No.
  </p>
 </answer>



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 <answer id="perf-exit">
  <p>
   No.
  </p>
 </answer>



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 <answer id="perf-huge_dialogs">
  <p>
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  </p>
 </answer>



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 <answer id="perf-limit">
  <p>
   None known.
  </p>
 </answer>



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 <answer id="perf-mem">
  <p>
   The implementation doesn't consume any memory apart from some
   static fields, e.g. the <code>Lookup.Result</code> containing
   the registered <code>PersistenceScopeProvider</code>'s.
  </p>
 </answer>



<!--
        <question id="perf-menus" when="final">
            Does your module use dynamically updated context menus, or
            context-sensitive actions with complicated and slow enablement logic?
            <hint>
                If you do a lot of tricks when adding actions to regular or context menus, you can significantly
                slow down display of the menu, even when the user is not using your action. Pay attention to
                actions you add to the main menu bar, and to context menus of foreign nodes or components. If
                the action is conditionally enabled, or changes its display dynamically, you need to check the
                impact on performance. In some cases it may be more appropriate to make a simple action that is
                always enabled but does more detailed checks in a dialog if it is actually run.
            </hint>
        </question>
-->
 <answer id="perf-menus">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="perf-progress" when="final">
            Does your module execute any long-running tasks?
            
            <hint>Long running tasks should never block 
            AWT thread as it badly hurts the UI
            <a href="http://performance.netbeans.org/responsiveness/issues.html">
            responsiveness</a>.
            Tasks like connecting over
            network, computing huge amount of data, compilation
            be done asynchronously (for example
            using <code>RequestProcessor</code>), definitively it should 
            not block AWT thread.
            </hint>
        </question>
-->
 <answer id="perf-progress">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="perf-scale" when="init">
            Which external criteria influence the performance of your
            program (size of file in editor, number of files in menu, 
            in source directory, etc.) and how well your code scales?
            <hint>
            Please include some estimates, there are other more detailed 
            questions to answer in later phases of implementation. 
            </hint>
        </question>
-->
 <answer id="perf-scale">
  <p>
   Performance scales linearly with the number of registered clients.
  </p>
 </answer>



<!--
        <question id="perf-spi" when="init">
            How the performance of the plugged in code will be enforced?
            <hint>
            If you allow foreign code to be plugged into your own module, how
            do you enforce that it will behave correctly and quickly and will not
            negatively influence the performance of your own module?
            </hint>
        </question>
-->
 <answer id="perf-spi">
  <p>
   The plugged-in code is expected to execute quickly.
  </p>
 </answer>



<!--
        <question id="perf-startup" when="final">
            Does your module run any code on startup?
        </question>
-->
 <answer id="perf-startup">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="perf-wakeup" when="final">
            Does any piece of your code wake up periodically and do something
            even when the system is otherwise idle (no user interaction)?
        </question>
-->
 <answer id="perf-wakeup">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="resources-file" when="final">
            Does your module use <code>java.io.File</code> directly?
            
            <hint>
            NetBeans provide a logical wrapper over plain files called 
            <code>org.openide.filesystems.FileObject</code> that
            provides uniform access to such resources and is the preferred
            way that should be used. But of course there can be situations when
            this is not suitable.
            </hint>
        </question>
-->
 <answer id="resources-file">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="resources-layer" when="final">
            Does your module provide own layer? Does it create any files or
            folders in it? What it is trying to communicate by that and with which 
            components?
            
            <hint>
            NetBeans allows automatic and declarative installation of resources 
            by module layers. Module register files into appropriate places
            and other components use that information to perform their task
            (build menu, toolbar, window layout, list of templates, set of
            options, etc.). 
            </hint>
        </question>
-->
 <answer id="resources-layer">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="resources-mask" when="final">
            Does your module mask/hide/override any resources provided by other modules in
            their layers?
            
            <hint>
            If you mask a file provided by another module, you probably depend
            on that and do not want the other module to (for example) change
            the file's name. That module shall thus make that file available as an API
            of some stability category.
            </hint>
        </question>
-->
 <answer id="resources-mask">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="resources-read" when="final">
            Does your module read any resources from layers? For what purpose?
            
            <hint>
            As this is some kind of intermodule dependency, it is a kind of API.
            Please describe it and classify according to 
            <a href="http://openide.netbeans.org/tutorial/api-design.html#categories">
            common stability categories</a>.
            </hint>
        </question>
-->
 <answer id="resources-read">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="security-grant" when="final">
            Does your code grant additional rights to some other code?
            <hint>Avoid using a class loader that adds extra
            permissions to loaded code unless really necessary.
            Also note that your API implementation
            can also expose unneeded permissions to enemy code by
            calling AccessController.doPrivileged().</hint>
        </question>
-->
 <answer id="security-grant">
  <p>
   No.
  </p>
 </answer>



<!--
        <question id="security-policy" when="final">
            Does your functionality require modifications to the standard policy file?
            <hint>Your code might pass control to third-party code not
            coming from trusted domains. This could be code downloaded over the
            network or code coming from libraries that are not bundled
            with NetBeans. Which permissions need to be granted to which domains?</hint>
        </question>
-->
 <answer id="security-policy">
  <p>
   No.
  </p>
 </answer>

</api-answers>