Class: DataStorage

Inherits:
Object
  • Object
show all
Defined in:
lib/common/datastorage.rb

Instance Method Summary collapse

Constructor Details

#initialize(maxItemsInMemory, maxItemsOnDisk, persistentStorageHandler) ⇒ DataStorage

Returns a new instance of DataStorage.



26
27
28
29
30
31
32
33
 
# File 'lib/common/datastorage.rb', line 26

def initialize( maxItemsInMemory, maxItemsOnDisk, persistentStorageHandler )
  @maxItemsInMemory = maxItemsInMemory
  # TODO: currently not used
  @maxItemsOnDisk = maxItemsOnDisk
  @persistentStorageHandler = persistentStorageHandler
  
  delete_all
end

Instance Method Details

#add(key, data) ⇒ Object 



36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
 
# File 'lib/common/datastorage.rb', line 36

def add( key, data )
  container = @items[key]
  if ( container == nil )
    container = DataContainer.new( key, data, @persistentStorageHandler )
    @items[key] = container
    @itemsInMemory.insert( 0, container )
    
  elsif ( container.data_in_memory? )
    @itemsInMemory.delete( container )
    @itemsInMemory.insert( 0, container )
    container.data = data
  
  else
    # on disk
    container.data = data
    @itemsInMemory.insert( 0, container )
  end
  
  check_memory_items
  
end

#delete(key) ⇒ Object 



59
60
61
62
63
64
65
66
67
68
 
# File 'lib/common/datastorage.rb', line 59

def delete( key )
  container = @items.delete( key )
  if ( container != nil )
    if ( container.data_in_memory? )
      @itemsInMemory.delete( container )
    end
    container.clear
  end
  
end

#delete_all ⇒ Object 



88
89
90
91
92
93
 
# File 'lib/common/datastorage.rb', line 88

def delete_all
  @persistentStorageHandler.delete_all_files
  
  @itemsInMemory = []
  @items = {}
end

#get(key) ⇒ Object 



71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
 
# File 'lib/common/datastorage.rb', line 71

def get( key )
  container = @items[key]
  if ( container == nil )
    return nil
  end
  
  if ( container.data_in_memory? )
    @itemsInMemory.delete( container )
  end
  
  @itemsInMemory.insert( 0, container )
  check_memory_items
  
  return container.data
end