Class: SimpleCache::SqliteStore

Inherits:
SqliteDatabase show all
Defined in:
lib/simple_cache/sqlite_store.rb

Constant Summary collapse

Marshal = 
::SimpleCache::Marshal
TABLE_NAME = 
"simple_cache"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from SqliteDatabase

#ask, #exec

Constructor Details

#initialize(name) ⇒ SqliteStore

Returns a new instance of SqliteStore.



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# File 'lib/simple_cache/sqlite_store.rb', line 38

def initialize(name) 
  @path = "#{SimpleCache::SqliteStore.base_dir}/#{name}/simple_cache.sqlite3" 
  super @path

  begin
    ask("SELECT 1 FROM #{TABLE_NAME} LIMIT 1")
  rescue SQLite3::SQLException
    ask("CREATE TABLE #{TABLE_NAME}(uid INTEGER PRIMARY KEY, value TEXT, ttl INTEGER NOT NULL)")
  end
end

Instance Attribute Details

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/simple_cache/sqlite_store.rb', line 36

def path
  @path
end

Class Method Details

.base_dir ⇒ Object 



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# File 'lib/simple_cache/sqlite_store.rb', line 28

def self.base_dir
  if RUBY_PLATFORM.downcase.include?("darwin")
    "#{Dir.home}/Library/Cache"
  else
    "#{Dir.home}/cache"
  end
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/simple_cache/sqlite_store.rb', line 69

def clear
  ask "DELETE FROM #{TABLE_NAME}"
end

#fetch(key, &block) ⇒ Object 



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# File 'lib/simple_cache/sqlite_store.rb', line 49

def fetch(key, &block)
  value, ttl = ask("SELECT value, ttl FROM #{TABLE_NAME} WHERE uid=?", Marshal.uid(key))
  if ttl && (ttl == 0 || ttl > Time.now.to_i)
    Marshal.unmarshal(value) 
  elsif block_given?
    yield self, key
  end
end

#store(key, value, ttl = nil) ⇒ Object 



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# File 'lib/simple_cache/sqlite_store.rb', line 58

def store(key, value, ttl = nil)
  unless value.nil?
    ask("REPLACE INTO #{TABLE_NAME}(uid, value, ttl) VALUES(?,?,?)", 
          Marshal.uid(key), Marshal.marshal(value), ttl ? ttl + Time.now.to_i : 0)
  else
    ask("DELETE FROM #{TABLE_NAME} WHERE uid=?", Marshal.uid(key))
  end

  value
end