Class: Cached::ConfigCompiler

Inherits:
Object
  • Object
show all
Defined in:
lib/cached/config_compiler.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ ConfigCompiler

Returns a new instance of ConfigCompiler.



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# File 'lib/cached/config_compiler.rb', line 5

def initialize(config)
  @config = config      
end

Instance Method Details

#compiled_fetch_method_for(index) ⇒ Object 



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# File 'lib/cached/config_compiler.rb', line 54

def compiled_fetch_method_for(index)  
  index_name = index_name(index)     
  cache_key  = index_cache_key(index)
  
  method_suffix_and_parameters = "#{index_name}(#{index.join(', ')})"
  
  delegation = @config.delegates.collect { |delegate| "|| #{delegate}_by_#{method_suffix_and_parameters}"  }
  
  "def self.lookup_by_#{method_suffix_and_parameters};" + 
  "  if key = Cached.store.read(#{cache_key});"+
  "    lookup(key);"+
  "  else;"+ 
  "    obj = nil #{delegation};" +
  "    obj.save_indexes_to_cache if obj.respond_to?(:save_indexes_to_cache);" +
  "    obj;" +
  "  end;" +
  "end;"
end

#compiled_fetch_method_for_primary_key ⇒ Object 



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# File 'lib/cached/config_compiler.rb', line 73

def compiled_fetch_method_for_primary_key      
  
  delegation = @config.delegates.collect{|c| "|| #{c}(pk)" }.join
  
  "def self.lookup(pk);" +
  "  Cached.store.fetch(\"#\{object_cache_prefix}:#\{pk}\") { nil #{delegation} };" +      
  "end;" +
  
  
  "def self.lookup_by_#{@config.primary_key}(pk);" + 
  "  lookup(pk); "+
  "end;" 
end

#compiled_fetch_methods ⇒ Object 



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# File 'lib/cached/config_compiler.rb', line 87

def compiled_fetch_methods
  compiled_fetch_method_for_primary_key + @config.indexes.collect { |index| compiled_fetch_method_for(index) }.join(';')
end

#compiled_meta_methods ⇒ Object 



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# File 'lib/cached/config_compiler.rb', line 13

def compiled_meta_methods
  
  # Instance methods
  "def object_cache_primary_key; \"#{@config.primary_key}\"; end;" + 
  "def object_cache_key; \"\#{object_cache_prefix}:\#{#{@config.primary_key}}\"; end;" + 
  "def object_cache_prefix; \"#{@config.class_name}\"; end;" +       
  "def object_cache_hash(*args); args.join.hash; end;" +
  
  # Class methods
  "def self.object_cache_prefix; \"#{@config.class_name}\"; end;" +       
  "def self.object_cache_hash(*args); args.join.hash; end;"
end

#compiled_save_index_method ⇒ Object 



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# File 'lib/cached/config_compiler.rb', line 40

def compiled_save_index_method
        
  keys = @config.indexes.collect { |index| index_cache_key(index) }
  
  "def save_indexes_to_cache;" + 
    "v = #{@config.primary_key};" +
    keys.collect{|k| "Cached.store.write(#{k}, v);"}.join +
  "end;" +
  
  "def expire_indexes_in_cache;" +
    keys.collect{|k| "Cached.store.delete(#{k});"}.join +
  "end;"
end

#compiled_save_methods ⇒ Object 



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# File 'lib/cached/config_compiler.rb', line 26

def compiled_save_methods
  compiled_save_object_method + compiled_save_index_method
end

#compiled_save_object_method ⇒ Object 



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# File 'lib/cached/config_compiler.rb', line 30

def compiled_save_object_method          
  "def save_object_to_cache;" + 
    "Cached.store.write(object_cache_key, self);" +
  "end;" +
  
  "def expire_object_in_cache;" + 
    "Cached.store.delete(object_cache_key);" +
  "end;"
end

#to_ruby ⇒ Object 



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# File 'lib/cached/config_compiler.rb', line 9

def to_ruby    
  [compiled_meta_methods, compiled_save_methods, compiled_fetch_methods].join      
end