Class: Merb::Cache::DatabaseStore::DataMapper::CacheModel

Inherits:
DataMapper::Base
  • Object
show all
Defined in:
lib/merb-cache/cache-store/database-datamapper.rb

Overview

The cache model

Class Method Summary collapse

Class Method Details

.cache_get(key) ⇒ Object

Fetch data from the database using the specified key The entry is deleted if it has expired

Parameter

key<Sting>

The key identifying the cache entry

Returns

data<String, NilClass>

nil is returned whether the entry expired or was not found



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# File 'lib/merb-cache/cache-store/database-datamapper.rb', line 20

def self.cache_get(key)
  if entry = self.first(key)
    return entry.data if entry.expire.nil? || DateTime.now < entry.expire
    entry.destroy!
  end
  nil
end

.cache_set(key, data, expire = nil, get = true) ⇒ Object

Store data to the database using the specified key

Parameters

key<Sting>

The key identifying the cache entry

data<String>

The data to be put in cache

expire<~minutes>

The number of minutes (from now) the cache should persist

get<Boolean>

used internally to behave like this:

  • when set to true, perform update_or_create on the cache entry

  • when set to false, force creation of the cache entry



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# File 'lib/merb-cache/cache-store/database-datamapper.rb', line 39

def self.cache_set(key, data, expire = nil, get = true)
  attributes = {:ckey => key, :data => data,
    :expire => expire.nil? ? nil : expire.to_s_db }
  if get
    entry = self.first(key)
    entry.nil? ? self.create(attributes) : entry.update_attributes(attributes)
  else
    self.create(attributes)
  end
  true
end

.check_table ⇒ Object

Perform auto-migration in case the table is unknown in the database



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# File 'lib/merb-cache/cache-store/database-datamapper.rb', line 75

def self.check_table
  self.auto_migrate! unless self.table.exists?
end

.expire(key) ⇒ Object

Expire the cache entry identified by the given key

Parameter

key<Sting>

The key identifying the cache entry



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# File 'lib/merb-cache/cache-store/database-datamapper.rb', line 55

def self.expire(key)
  entry = self.first(key)
  entry.destroy! unless entry.nil?
end

.expire_all ⇒ Object

Expire all the cache entries



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# File 'lib/merb-cache/cache-store/database-datamapper.rb', line 70

def self.expire_all
  self.truncate!
end

.expire_match(key) ⇒ Object

Expire the cache entries matching the given key

Parameter

key<Sting>

The key matching the cache entries



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# File 'lib/merb-cache/cache-store/database-datamapper.rb', line 64

def self.expire_match(key)
  #FIXME
  database.execute("DELETE FROM #{self.table.name} WHERE ckey LIKE '#{key}%'")
end