[jira] [Resolved] (DIRECTMEMORY-62) Adopt fluent APIs for bootstrapping the Cache (and optionally manage stored objects)

["Simone Tripodi (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DIRECTMEMORY-62?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simone Tripodi resolved DIRECTMEMORY-62.
----------------------------------------

    Resolution: Won't Fix

when starting managing components binding, started a pain. much better relying on a 3rd part component/container/DIfw/whatelse that manages it and I don't have to become crazy
                
> Adopt fluent APIs for bootstrapping the Cache (and optionally manage stored objects)
> ------------------------------------------------------------------------------------
>
>                 Key: DIRECTMEMORY-62
>                 URL: https://issues.apache.org/jira/browse/DIRECTMEMORY-62
>             Project: Apache DirectMemory
>          Issue Type: New Feature
>    Affects Versions: 0.6.0
>            Reporter: Simone Tripodi
>            Assignee: Simone Tripodi
>             Fix For: 0.6.0
>
>         Attachments: edsl-prototype.patch
>
>
> Hi all guys,
> as discussed some days ago, I started prototyping an EDSL embedded in DM to make Cache APIs more "sexy" :)
> So, influenced by the past experience with Commons Digester - influenced by Google Guice - I tried to identify the 2 phases in the Cache lifecycle
>  * the "bootstrap" phase - where settings are used to instantiate the Cache;
>  * the object store management.
> Current codebase has a mix of both and users have to be aware of correct sequence of operations call, I mean, calling {{Cache.retrieve( "aaa" )}} without having previously called {{Cache.init( 1, Ram.Mb( 100 ) )}} at the beginning of the program, would cause an error. That is why I recurred to a kind of "configuration" pattern to make sure Cache instance have to be configured first and then can be used:
> {code}
>         /* Basic configuration APIs */
>         Cache cache = DirectMemory.createNewInstance( new CacheConfiguration()
>         {
>             @Override
>             public void configure( CacheConfigurator cacheConfigurator )
>             {
>                 cacheConfigurator.numberOfBuffers().ofSize( 1 );
>                 cacheConfigurator.allocateMemoryOfSize( 128 ).Mb();
>                 cacheConfigurator.scheduleDisposalEvery( 10 ).hours();
>                 cacheConfigurator.bindConcurrentMap().withJVMConcurrentMap();
>                 cacheConfigurator.bindMemoryManagerService().withDefaultImplamentation();
>                 cacheConfigurator.bindSerializer().fromServiceProviderInterface();
>             }
>         } );
> {code}
> Hoping that the code itself is clear enough, the {{DirectMemory}} class accepts a {{CacheConfiguration}}, users have to override the {{ configure( CacheConfigurator )}} method, where describing the basic Cache behavior, and will return a Cache instance.
> According to the DRY (Don't Repeat Yourself) principle, repeating "cacheConfigurator" over and over for each binding can get a little tedious, so there is an abstract support class:
> {code}
>         cache = DirectMemory.createNewInstance( new AbstractCacheConfiguration()
>         {
>             @Override
>             protected void configure()
>             {
>                 numberOfBuffers().ofSize( 1 );
>                 allocateMemoryOfSize( 128 ).Mb();
>                 scheduleDisposalEvery( 10 ).hours();
>                 bindConcurrentMap().withJVMConcurrentMap();
>                 bindMemoryManagerService().withDefaultImplamentation();
>                 bindSerializer().fromServiceProviderInterface();
>             }
>         } );
> {code}
> Once obtained the Cache instance, users can now start storing objects:
> {code}
>         Pointer a = cache.allocatePointer( 1 ).Gb().identifiedBy( "Simo" );
>         Pointer b = cache.put( "Strored!" ).identifiedBy( "Raf" ).thatNeverExpires();
>         Pointer c = cache.putByteArray( new byte[0] ).identifiedBy( "Izio" ).thatExpiresIn( 1 ).days();
>         Pointer d = cache.update( new Object() ).identifiedBy( "Olivier" );
>         Pointer e = cache.updateByteArray( new byte[0] ).identifiedBy( "TomNaso" );
> {code}
> WDYT?

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