生产者位置
sequence(-1)
SequenceBarrier
EventProcessor（Consumer）
EventHandler
gatingSequences
Sequencer
sequences
waitStrategy
Producer
dependentSequences
EventFactory
依赖
cursor生产者序列
RingBuffer
EventHandlerGroup
ProducerSequencer
WaitStrategy
EventProcessorGroup1
FixedSequenceGroup(Sequence)
cursorSequence
EventProcessorGroup2
