How to use

Cache

in

org.apache.polygene.spi.cache

@Test
public void givenCacheWithAValueWhenReplacingValueExpectNewValue()
{
  cache.put( "Habba", "Zout" );
  assertEquals( "Zout", cache.get( "Habba" ) );
  cache.put( "Habba", "Zout2" );
  assertEquals( "Zout2", cache.get( "Habba" ) );
}

@Test
public void givenEmptyCacheWhenFetchingValueExpectNull()
{
  assertNull( cache.get( "1" ) );
}

  cache.put( state.entityReference().identity().toString(),
        new CacheState( state.state().toString() ) );
  cache.put( state.entityReference().identity().toString(),
        new CacheState( state.state().toString() ) );
cache.remove( state.entityReference().identity().toString() );

cache.put( reference.identity().toString(), new CacheState( loadedState.state().toString() ) );

@Test
public void givenEmptyCacheWhenFetchingValueExpectNull()
{
  assertNull( cache.get( "1" ) );
}

  cache.put( state.entityReference().identity().toString(),
        new CacheState( state.state().toString() ) );
  cache.put( state.entityReference().identity().toString(),
        new CacheState( state.state().toString() ) );
cache.remove( state.entityReference().identity().toString() );

cache.put( reference.identity().toString(), new CacheState( loadedState.state().toString() ) );

@Test
public void givenCacheWithAValueWhenReplacingValueExpectNewValue()
{
  cache.put( "Habba", "Zout" );
  assertEquals( "Zout", cache.get( "Habba" ) );
  cache.put( "Habba", "Zout2" );
  assertEquals( "Zout2", cache.get( "Habba" ) );
}

private EntityState fetchCachedState( EntityReference reference, ModuleDescriptor module, Instant currentTime )
{
  CacheState cacheState = cache.get( reference.identity().toString() );
  if( cacheState != null )
  {
    JsonObject state = jsonFactories.readerFactory().createReader( new StringReader( cacheState.string ) )
                    .readObject();
    try
    {
      String type = state.getString( JSONKeys.TYPE );
      EntityDescriptor entityDescriptor = module.entityDescriptor( type );
      String version = state.getString( JSONKeys.VERSION );
      Instant modified = Instant.ofEpochMilli( state.getJsonNumber( JSONKeys.MODIFIED ).longValueExact() );
      return new JSONEntityState( entityDescriptor.module(), serialization, jsonFactories,
                    version, modified,
                    reference,
                    EntityStatus.LOADED, entityDescriptor,
                    state );
    }
    catch( Exception e )
    {
      // Should not be able to happen, unless internal error in the cache system.
      throw new EntityStoreException( e );
    }
  }
  return null;
}

@Test
public void givenCacheWithAValueWhenRequestingThatValueExpectItBack()
{
  cache.put( "Habba", "Zout" );
  assertEquals( "Zout", cache.get( "Habba" ) );
}

private EntityState fetchCachedState( EntityReference reference, ModuleDescriptor module, Instant currentTime )
{
  CacheState cacheState = cache.get( reference.identity().toString() );
  if( cacheState != null )
  {
    JsonObject state = jsonFactories.readerFactory().createReader( new StringReader( cacheState.string ) )
                    .readObject();
    try
    {
      String type = state.getString( JSONKeys.TYPE );
      EntityDescriptor entityDescriptor = module.entityDescriptor( type );
      String version = state.getString( JSONKeys.VERSION );
      Instant modified = Instant.ofEpochMilli( state.getJsonNumber( JSONKeys.MODIFIED ).longValueExact() );
      return new JSONEntityState( entityDescriptor.module(), serialization, jsonFactories,
                    version, modified,
                    reference,
                    EntityStatus.LOADED, entityDescriptor,
                    state );
    }
    catch( Exception e )
    {
      // Should not be able to happen, unless internal error in the cache system.
      throw new EntityStoreException( e );
    }
  }
  return null;
}

@Test
public void givenCacheWithAValueWhenRequestingThatValueExpectItBack()
{
  cache.put( "Habba", "Zout" );
  assertEquals( "Zout", cache.get( "Habba" ) );
}

@Override
public synchronized String versionOf( EntityStoreUnitOfWork uow, EntityReference reference )
{
  CacheState cacheState = cache.get( reference.identity().toString() );
  if( cacheState != null )
  {
    return jsonFactories.readerFactory().createReader( new StringReader( cacheState.string ) ).readObject()
              .getString( JSONKeys.VERSION );
  }
  // Get state
  try( JsonReader reader = jsonFactories.readerFactory().createReader( mapEntityStore.get( reference ) ) )
  {
    return reader.readObject().getString( JSONKeys.VERSION );
  }
  catch( EntityStoreException ex )
  {
    throw ex;
  }
  catch( Exception ex )
  {
    throw new EntityStoreException( ex );
  }
}

  @Test
  public void givenCacheWithValueWhenDroppingReferenceAndRequestNewCacheAndItsValueExpectItToBeGone()
  {
    cache.put( "Habba", "Zout" );
    assertEquals( "Zout", cache.get( "Habba" ) );
    cachePool.returnCache( cache );
    cache = cachePool.fetchCache( "1", String.class );
    assertNull( "Value not missing", cache.get( "Habba" ) );
  }
}

@Override
public synchronized String versionOf( EntityStoreUnitOfWork uow, EntityReference reference )
{
  CacheState cacheState = cache.get( reference.identity().toString() );
  if( cacheState != null )
  {
    return jsonFactories.readerFactory().createReader( new StringReader( cacheState.string ) ).readObject()
              .getString( JSONKeys.VERSION );
  }
  // Get state
  try( JsonReader reader = jsonFactories.readerFactory().createReader( mapEntityStore.get( reference ) ) )
  {
    return reader.readObject().getString( JSONKeys.VERSION );
  }
  catch( EntityStoreException ex )
  {
    throw ex;
  }
  catch( Exception ex )
  {
    throw new EntityStoreException( ex );
  }
}

  @Test
  public void givenCacheWithValueWhenDroppingReferenceAndRequestNewCacheAndItsValueExpectItToBeGone()
  {
    cache.put( "Habba", "Zout" );
    assertEquals( "Zout", cache.get( "Habba" ) );
    cachePool.returnCache( cache );
    cache = cachePool.fetchCache( "1", String.class );
    assertNull( "Value not missing", cache.get( "Habba" ) );
  }
}