Class: Kvs

Inherits:
Object
  • Object
show all
Defined in:
lib/sekka/kvs.rb

Instance Method Summary collapse

Constructor Details

#initialize(dbtype) ⇒ Kvs

Returns a new instance of Kvs.



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# File 'lib/sekka/kvs.rb', line 37

def initialize( dbtype )
  @tcFlag = true
  begin
    require 'tokyocabinet'
  rescue LoadError
    @tcFlag = false
  end

  @redisFlag = true
  begin
    require 'redis'
  rescue LoadError
    @redisFlag = false
  end

  @dbmFlag = true
  begin
    require 'dbm'
  rescue LoadError
    @dbmFlag = false
  end

  @dbtype = dbtype
  case dbtype
  when :tokyocabinet
    if @tcFlag
      @db = TokyoCabinet::HDB.new( )
    else
      raise RuntimeError, "Kvs.new() missed require( 'tokyocabinet' )."
    end

  when :redis
    if not @redisFlag
      raise RuntimeError, "Kvs.new() missed require( 'redis' )."
    end

  when :memcache
    # do nothing

  when :dbm
    if @dbmFlag
      # do nothing
    else
      raise RuntimeError, "Kvs.new() missed require( 'dbm' )."
    end

    # do nothing

  when :pure
    # do nothing
  else
    raise ArgumentError, "Kvs.new() requires reserved DB typename"
  end
end

Instance Method Details

#_db ⇒ Object

for testing



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# File 'lib/sekka/kvs.rb', line 241

def _db()
  @db
end

#clear ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 175

def clear()
  case @dbtype
  when :tokyocabinet, :dbm, :pure
    @db.clear
  when :redis
    @db.flushall
  when :memcache
    # do nothing
  else
    raise RuntimeError
  end
end

#close ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 225

def close()
  case @dbtype
  when :tokyocabinet, :dbm
    @db.close
  when :memcache, :redis
    # do nothign
  when :pure
    File.open( @name, "w" ) { |f|
      f.print( @db )
    }
  else
    raise RuntimeError
  end
end

#delete(key) ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 165

def delete( key )
  case @dbtype
  when :redis
    @db.del( key )
  else
    @db.delete( key )
  end
  true
end

#fixdb ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 119

def fixdb( )
  case @dbtype
  when :tokyocabinet
    if not @db.optimize( )
      raise RuntimeError, sprintf( "TokyoCabinet::HDB.optimize error: file=%s", name )
    end
  end
  true
end

#forward_match_keys(prefix) ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 204

def forward_match_keys( prefix )
  case @dbtype
  when :tokyocabinet
    @db.fwmkeys( prefix ).each { |k|
      k.force_encoding("UTF-8")
    }
  when :redis
    @db.keys( prefix + "*" ).each { |k|
      k.force_encoding("UTF-8")
    }
  when :memcache
    raise RuntimeError, "Kvs#forward_match_keys method was not implemented for memcache."
  when :dbm, :pure
    self.keys( ).select {|key|
      key.match( "^" + prefix )
    }
  else
    raise RuntimeError
  end
end

#get(key, fallback = false) ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 152

def get( key, fallback = false )
  if 0 == key.size
    fallback
  else
    val = @db[ key ]
    if val
      val.force_encoding("UTF-8")
    else
      fallback
    end
  end
end

#keys ⇒ Object

return array of key string



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# File 'lib/sekka/kvs.rb', line 189

def keys()
  case @dbtype
  when :tokyocabinet, :dbm, :redis
    @db.keys.map { |k|
      k.force_encoding("UTF-8")
    }
  when :memcache
    raise RuntimeError, "Kvs#keys method was not implemented for memcache."
  when :pure
    @db.keys
  else
    raise RuntimeError
  end
end

#open(name) ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 92

def open( name )
  case @dbtype
  when :tokyocabinet
    if not @db.open( name, TokyoCabinet::HDB::OWRITER | TokyoCabinet::HDB::OCREAT )
      raise RuntimeError, sprintf( "TokyoCabinet::HDB.open error: file=%s", name )
    end
  when :redis
    @db = Redis.new( :host => name )
  when :memcache
    @db = MemCache.new( name )
  when :dbm
    @db = DBM.new( name )
  when :pure
    @name = name
    if File.exist?( @name )
      File.open( @name ) {|f|
        @db = eval( f.read() )
      }
      @db
    else
      @db = Hash.new
    end
  else
    raise RuntimeError
  end
end

#pure_put!(key, value, timeout = 0) ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 136

def pure_put!( key, value, timeout = 0 )
  if 0 < key.size
    case @dbtype
    when :tokyocabinet, :dbm, :redis
      @db[ key.force_encoding("ASCII-8BIT") ] = value.force_encoding("ASCII-8BIT")
    when :memcache
      @db.set( key.force_encoding("ASCII-8BIT"), value.force_encoding("ASCII-8BIT"), timeout )
    when :pure
      @db[ key ] = value
    else
      raise RuntimeError
    end
  end
  value
end

#put!(key, value, timeout = 0) ⇒ Object 



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# File 'lib/sekka/kvs.rb', line 129

def put!( key, value, timeout = 0 )
  if not self.pure_put!( key, value, timeout )
    raise RuntimeError sprintf( "put! error: key=%s", key.force_encoding("ASCII-8BIT"))
  end
  value
end