Class: Kvs
- Inherits:
-
Object
- Object
- Kvs
- Defined in:
- lib/sekka/kvs.rb
Instance Method Summary collapse
-
#_db ⇒ Object
for testing.
- #clear ⇒ Object
- #close ⇒ Object
- #delete(key) ⇒ Object
- #fixdb ⇒ Object
- #forward_match_keys(prefix) ⇒ Object
- #get(key, fallback = false) ⇒ Object
-
#initialize(dbtype) ⇒ Kvs
constructor
A new instance of Kvs.
-
#keys ⇒ Object
return array of key string.
- #open(name) ⇒ Object
- #pure_put!(key, value, timeout = 0) ⇒ Object
- #put!(key, value, timeout = 0) ⇒ Object
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 @gdbmFlag = true begin require 'gdbm' rescue LoadError @gdbmFlag = false end @leveldbFlag = true begin require 'leveldb' rescue LoadError @leveldbFlag = false end @mapdbFlag = true begin require 'sekka/jruby_mapdb' rescue LoadError @mapdbFlag = 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 :gdbm if @gdbmFlag # do nothing else raise RuntimeError, "Kvs.new() missed require( 'gdbm' )." end when :leveldb if @leveldbFlag # do nothing else raise RuntimeError, "Kvs.new() missed require( 'leveldb' )." end when :mapdb if @mapdbFlag # do nothing else raise RuntimeError, "Kvs.new() missed require( 'sekka/jruby_mapdb' )." end 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 292 def _db() @db end |
#clear ⇒ Object
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# File 'lib/sekka/kvs.rb', line 222 def clear() case @dbtype when :tokyocabinet, :gdbm, :pure, :mapdb @db.clear when :leveldb @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 274 def close() case @dbtype when :tokyocabinet, :leveldb, :gdbm @db.close when :memcache, :redis # do nothing when :mapdb @basedb.close 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 212 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 156 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 253 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 :gdbm, :leveldb, :pure, :mapdb 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 191 def get( key, fallback = false ) if 0 == key.size fallback else val = '' case @dbtype when :memcache val = @db.get(key.force_encoding("ASCII-8BIT")) when :mapdb val = @db.get(key) else val = @db[ key ] end if val return val.force_encoding("UTF-8") else return fallback end end end |
#keys ⇒ Object
return array of key string
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# File 'lib/sekka/kvs.rb', line 238 def keys() case @dbtype when :tokyocabinet, :gdbm, :redis, :mapdb @db.keys.map { |k| k.force_encoding("UTF-8") } when :memcache raise RuntimeError, "Kvs#keys method was not implemented for memcache." when :leveldb, :pure @db.keys else raise RuntimeError end end |
#open(name) ⇒ Object
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# File 'lib/sekka/kvs.rb', line 118 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 = MemcachePod::Client.new( name, { :expires_in => 600 } ) when :gdbm if not name.match( /.db$/ ) name = name + ".db" end @db = GDBM.new( name, nil, GDBM::FAST | GDBM::WRCREAT ) when :leveldb if not name.match( /.ldb$/ ) name = name + ".ldb" end @db = LevelDB::DB.new name when :mapdb @basedb = MapDB::DB.new(name,"sekka") @db = @basedb.getTree 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 173 def pure_put!( key, value, timeout = 0 ) if 0 < key.size case @dbtype when :tokyocabinet, :gdbm, :redis, :leveldb @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 :mapdb @db.set( key, value ) 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 166 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 |