Module: RecordCache::ClassMethods

Defined in:
lib/record_cache.rb

Instance Method Summary collapse

Instance Method Details

#add_cached_index(index) ⇒ Object 



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# File 'lib/record_cache.rb', line 147

def add_cached_index(index)
  name  = index.name
  count = nil
  # Make sure the key is unique.
  while cached_indexes["#{name}#{count}"]
    count ||= 0
    count += 1
  end
  cached_indexes["#{name}#{count}"] = index
end

#cached_index(name) ⇒ Object 



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# File 'lib/record_cache.rb', line 140

def cached_index(name)
  name = name.to_s
  index = cached_indexes[name]
  index ||= base_class.cached_index(name) if base_class != self and base_class.respond_to?(:cached_index)
  index
end

#cached_index_names ⇒ Object 



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# File 'lib/record_cache.rb', line 164

def cached_index_names
  names = cached_indexes.keys
  names.concat(base_class.cached_index_names) if base_class != self and base_class.respond_to?(:cached_index_names)
  names.uniq
end

#cached_indexes ⇒ Object 



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# File 'lib/record_cache.rb', line 136

def cached_indexes
  @cached_indexes ||= {}
end

#delete_all_with_invalidate(conditions = nil) ⇒ Object 



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# File 'lib/record_cache.rb', line 91

def delete_all_with_invalidate(conditions = nil)
  invalidate_from_conditions(conditions) do |conditions|
    delete_all_without_invalidate(conditions)
  end
end

#each_cached_index ⇒ Object 



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# File 'lib/record_cache.rb', line 158

def each_cached_index
  cached_index_names.each do |index_name|
    yield cached_index(index_name)
  end      
end

#find_with_caching(*args, &block) ⇒ Object 



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# File 'lib/record_cache.rb', line 60

def find_with_caching(*args, &block)
  if args.last.is_a?(Hash)
    args.last.delete_if {|k,v| v.nil?}
    args.pop if args.last.empty?
  end
  
  if [:all, :first, :last].include?(args.first)
    opts = args.last
    if opts.is_a?(Hash) and opts.keys == [:conditions]
      # Try to match the SQL.
      if opts[:conditions] =~ /^"?#{table_name}"?.(\w*) = (\d*)$/
        field, value = $1, $2
        index = cached_index("by_#{field}")
        return index.find_by_field([value], self, args.first) if index
      end
    end
  elsif not args.last.is_a?(Hash)
    # This is a find with just ids.
    index = cached_index('by_id')
    return index.find_by_ids(args, self) if index
  end

  find_without_caching(*args, &block)
end

#invalidate_from_conditions(conditions, flag = nil) ⇒ Object 



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# File 'lib/record_cache.rb', line 97

def invalidate_from_conditions(conditions, flag = nil)
  if conditions.nil?
    # Just invalidate all indexes.
    result = yield(nil)
    self.increment_version
    return result
  end

  # Freeze ids to avoid race conditions.
  sql = "SELECT id FROM #{table_name} "
  self.send(:add_conditions!, sql, conditions, self.send(:scope, :find))
  ids = RecordCache.db(self).select_values(sql)

  return if ids.empty?
  conditions = "id IN (#{ids.join(',')})"

  if block_given?
    # Capture the ids to invalidate in lambdas.
    lambdas = []
    each_cached_index do |index|
      lambdas << index.invalidate_from_conditions_lambda(conditions)
    end

    result = yield(conditions)

    # Finish invalidating with prior attributes.
    lambdas.each {|l| l.call}      
  end

  # Invalidate again afterwards if we are updating (or for the first time if no block was given).
  if flag == :update or not block_given?
    each_cached_index do |index|
      index.invalidate_from_conditions(conditions)
    end
  end

  result
end

#record_cache_config(opts = nil) ⇒ Object 



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# File 'lib/record_cache.rb', line 170

def record_cache_config(opts = nil)
  if opts
    record_cache_config.merge!(opts)
  else
    @record_cache_config ||= RecordCache.config.clone
  end
end

#update_all_with_invalidate(updates, conditions = nil) ⇒ Object 



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# File 'lib/record_cache.rb', line 85

def update_all_with_invalidate(updates, conditions = nil)
  invalidate_from_conditions(conditions, :update) do |conditions|
    update_all_without_invalidate(updates, conditions)
  end
end