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@startuml
title sig_chain时序图

participant frontend
participant router_eeg 
participant receiver <<Recriver>>
participant preprocess <<Preprocess>>
participant buffer_plot <<Buffer>>
participant buffer_classify_online <<Buffer>>
participant connecter <<Connecter>>
participant buffer_save <<Buffer>>
participant hardware_sdk
participant saver <<Saver>>

note over buffer_plot : 1s 
/ note over buffer_saver : 1s 
/ note over buffer_classify_online : 1s 
/ note over connecter : delay_milliseconds = 0.5s 

=== 主要逻辑 ==

frontend -> router_eeg: websocket: xxx/eeg/data(get_wave_from_buffer)

loop 直到 is_ready==False
...buffer数据时长/2 s 后 ...
router_eeg - -> receiver:
receiver - -> connecter: receive_wave
connecter - -> hardware_sdk: NeuracleControllerReadData
    alt 成功
        hardware_sdk - -> connecter: NeuracleResult_Succeed
        ref over connecter: 保存数据，并通知观察者 
        connecter - -> receiver: True
    else 失败
        hardware_sdk - -> connecter: 其它标志
        connecter - -> receiver: False
    end

router_eeg - -> receiver: get_data_from_buffer
receiver - -> buffer_plot: get_sig
alt 数据够了
    buffer_plot - -> receiver: ret = {'data':data, 'status': 'ok', 'timestamp':timestamp}
    note right: 清空buffer
else 数据不够
    buffer_plot - -> receiver: ret = {'data':None, 'status': 'warn', 'timestamp':None}
end
receiver - -> router_eeg: ret
alt status == 'ok'
    opt 预处理
        router_eeg - -> preprocess: 滤波、降采样之类
        note over preprocess #FFAAAA: 目前已知问题是，如果buffer_plot 返回的数据长度\n不能被降采样率整除，返回的数据长度就不对！！
    end
    router_eeg - -> frontend: {'eegdata':data}
end

end

=== 子模块详情 ==

group 保存数据，并通知观察者[_add_a_data_block_to_buffer]
    alt 满足保存条件（有buffer_save, 有saver, 且saver准备好了）
        connecter - -> buffer_save: update
        connecter - -> buffer_save: get_sig
        note right: 清空buffer
        alt status == 'ok'
            connecter - -> saver: save_raw_data
        end
    end
    connecter - -> buffer_plot: update
    note right: 前提是buffer_plot已加入connector的观察者列表, \n注意：buffer的长度不能低于每次取包的长度（即delay_millisecond）, 否则一定丢失数据
    connecter - -> buffer_classify_online: update
    note right: 前提是buffer_classify_online已加入connector的观察者列表, \n注意：buffer的长度不能低于每次取包的长度（即delay_millisecond）, 否则一定丢失数据
end

@enduml

PlantUML version 1.2022.7(Tue Aug 23 01:01:30 CST 2022)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) 64-Bit Server VM
Default Encoding: GBK
Language: zh
Country: CN
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