CN108809731A - A kind of control method dimming optical projection system business datum chain based on subway - Google Patents
A kind of control method dimming optical projection system business datum chain based on subway Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 230000002159 abnormal effect Effects 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000000977 initiatory effect Effects 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 20
- 230000006854 communication Effects 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 11
- 238000004422 calculation algorithm Methods 0.000 claims description 5
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000012512 characterization method Methods 0.000 claims description 3
- 230000001915 proofreading effect Effects 0.000 claims description 2
- 238000004590 computer program Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
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- 238000004458 analytical method Methods 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/069—Management of faults, events, alarms or notifications using logs of notifications; Post-processing of notifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/12—Applying verification of the received information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
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- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
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- General Engineering & Computer Science (AREA)
- Information Transfer Between Computers (AREA)
- Computer And Data Communications (AREA)
Abstract
The present invention relates to a kind of control methods dimming optical projection system business datum chain based on subway, which is characterized in that this method includes：Node is initiated to generation when controlling operation under node to the business datum chain to operating and being numbered with globally unique business applied to lower control；Business datum chain is transmitted between node, from node-node transmission business datum chain when generate corresponding data group, the data group is used to record the operation log information of all slave nodes transmitted and is transferred to next from node；Data group can be verified when receiving data group from node, is decided whether to continue to execute business according to check results；When having executed all business from node or having occurred abnormal, business datum chain is returned to initiating node.
Description
Technical field
The present invention relates to a kind of control methods dimming optical projection system business datum chain based on subway, belong to computer neck
Domain.
Background technology
Subway dims optical projection system and is powered transparent using light modulation film and powers off atomization characteristics, and light modulation film or dimming glass are pacified
Mounted in shield door side, as Projection Display curtain, in its obverse track regions side installation projecting apparatus as video output terminals,
By a set of detection arrangement monitors train in/out station, projection is closed in realization when train enters the station one by one, and light modulation film is transparent, does not influence
Passenger getting on/off；Projection, light modulation film atomization, playing video advertisement, information are opened one by one when train is outbound by delaying policy
Deng.
The all devices that subway light modulation optical projection system track regions are related to are real-time by Mining and Control Device for electric installation, equipment state
It monitors, the equipment component and IT resources in computer room are also monitored in real-time.Monitoring device establishes network with Mining and Control Device or serial ports is logical
Letter realizes automation O&M monitoring in domain by task strategies such as regular, timing, conditions.
Monitoring service realizes that monitoring data interacts with high in the clouds center service by network communication, and Terminal Server Client passes through access
High in the clouds center service realizes that the equipment state being related to each subway station light modulation optical projection system carries out remote monitoring.
In underground railway track field of traffic, its design of subway light modulation optical projection system needs to consider its safety in operation, stability
And abnormality alarming, investigation restorability, it is therefore desirable to which real-time tracing analysis is carried out to the overall process of control logic used.
Invention content
Several exemplary aspects of the disclosure are summarized as follows.This summary is provided to the convenience of reader, to provide to this
The basic comprehension of a little embodiments rather than fully limit the scope of the present invention.This summarizes the extensive of not all contemplated embodiments
Summary, and it is neither intended to mark crucial or important element in all aspects, the range in terms of any or all is not described yet.Its
Sole purpose is that some concepts of one or more embodiments are presented in simplified form, is retouched in more detail as what is presented later
The prelude stated.For convenience, term " some embodiments " herein can be used for referring to the single embodiment or multiple of the disclosure
Embodiment.
The present invention provides a kind of control methods dimming optical projection system business datum chain based on subway, which is characterized in that
This method includes：Node is initiated to when controlling operation under node, generation is to being applied to lower control operation and having globally unique business
The business datum chain of number；Business datum chain is transmitted between node, from node-node transmission business datum chain when generate
Corresponding data group, the data group are transferred to down for recording the operation log information from node and being added to business datum chain
One from node；When accepting business data-link from node, business datum chain can be verified, be decided whether according to check results
Continue to execute business；Wherein, when executed it is all from the business of node when, return to business datum chain to initiating node；When at certain
When a node occurs abnormal, abnormality processing is attempted, when can not handle, carries out daily record output and alarm, and directly from present node
Node is initiated to return；If without return, accepting node meeting from the background, control business chain and time-out are arranged, real-time status verifies according to having descended
It is proofreaded, response results is notified to initiate node.According to the control for dimming optical projection system business datum chain based on subway
Method processed, wherein it is the client terminal device for giving control operation under to initiate node.
According to the control method for dimming optical projection system business datum chain based on subway, wherein from node for executing
Lower control operation, it is described from Node distribution in entity apparatus, each from node, there are multiple business operations, are each being handled from node
By globally unique node serial number after complete business operation, and, method, input parameter involved by business operation, output result and
Execute record etc. and be added into data group in order, data group is appended to business datum chain in order, wherein business operation include but
It is not limited to lower control operation and/or response business.
According to the control method for dimming optical projection system business datum chain based on subway, wherein initiating node to from section
The lower control of point, which operates, includes：A corresponding business datum chain, multiple lower controls behaviour are generated when lower control operates every time using node is initiated
Control can be in tight knot point at multiple business datum chains under the configuration that work is formed；When business datum chain generates, generated using assignment algorithm
Corresponding globally unique business number, business are inherited when numbering transmission services data-link among the nodes.
According to the control method for dimming optical projection system business datum chain based on subway, wherein being passed between node
Corresponding data group is generated when defeated business datum chain to include the following steps：Upper one is received from node push from node using next
When business datum chain, reads data signature result and verified, business processing is executed if being verified, if not on
Report is abnormal；It reads in data group in the past from nodal operation log information, and day will be operated when own service complete from node processing
Will information and from Node field mark be added in the past from nodal operation log information, and with business datum chain be sent to it is next from
Node；When sending, it is combined encryption by the data flow of itself and in the past from node data stream using HMAC and Base64, it is raw
It is sent to together at data signature result next from node；Wherein, it is data pair from the data flow of node, the data are to including
From Node field mark and operation log information；Wherein, it is identified as globally unique identifier from Node field.
Also according to the control method for dimming optical projection system business datum chain based on subway, wherein data signature result
Including：The encryption key issued is received from center service every fixed time period from node and be combined encryption, wherein key is slow
It is stored in inside the corresponding entity apparatus of node；Wherein, the encryption key that center service is issued every fixed time period is specific
Communication format.
According to the control method for dimming optical projection system business datum chain based on subway, wherein this method further includes：
When business datum chain is iterated through from node, re-calls the slave node controlled under executed and execute again, and will each save
Data group can be all written to business datum chain in point execution business.
According to the control method for dimming optical projection system business datum chain based on subway, wherein this method further includes：
It is described that multiple branch nodes are generated according to the difference of logical process when executing business processing from node, it will be from multiple branches section pair
Basis of characterization when being analyzed as Information Proofreading should be numbered from the business of node.
Beneficial effects of the present invention are：Business datum chain since supplemental data stream, data block step by step are redundancies,
But the business of control is far less than data collection service, therefore influences unobvious to data communication and business disposal efficiency；Each
In service node processing procedure, since business datum chain carries the business number being related to from starting service node to current business node
According to, therefore have enough data informations and carry out this service node and more refine business processing.All service nodes all can be into industry
Business data-link log recording will be according to the detailed warning information of generation, assist support personnel with business datum chain if there is exception
Quick positioning question point；Since each business level can periodically receive new key, and service node is in business processing, in industry
Business data-link carries out signature check and correction into fashionable, and control Information Security obtains higher guarantee, prevents invalid data from invading and harassing subway and throws
The equipment that shadow system is related to；Each service node has globally unique identifier number, and only there are one entrances for business processing, more
A outlet, therefore multiple branches can be generated in some service node, and then constitute control instruction under one and return to school with one group of response
To requiring；Business datum chain carries globally unique identifier ID, is that lower control instruction and response message are carried out in each level entity
Check and correction analysis when basis of characterization, for control result examine, control process trace, abnormal cause verification be provided which enough according to
According to.
Description of the drawings
Fig. 1 show overview flow chart according to the method for the present invention；
Fig. 2 is shown controls communication process schematic diagram according to the system business of embodiment of the present invention；
Fig. 3 show the control service logic process schematic according to embodiment of the present invention.
Specific implementation mode
Technical scheme of the present invention includes a kind of control method dimming optical projection system business datum chain based on subway, is applicable in
It is clear, complete in being carried out to the technique effect of the design of the present invention, concrete structure and generation below with reference to embodiment and attached drawing
Description, to be completely understood by the purpose of the present invention, scheme and effect.
It should be noted that unless otherwise specified, when a certain feature is referred to as " fixing ", " connection " is in another feature,
It can directly fix, be connected in another feature, can also fix, be connected in another feature indirectly.In addition, this
The descriptions such as the upper and lower, left and right used in open are only the mutual alignment pass relative to each component part of the disclosure in attached drawing
For system.The "an" of used singulative, " described " and "the" are also intended to including most forms in the disclosure, are removed
Non- context clearly shows that other meanings.In addition, unless otherwise defined, all of technologies and scientific terms used here by the article
It is identical as the normally understood meaning of those skilled in the art.Term used in the description is intended merely to describe herein
Specific embodiment is not intended to be limiting of the invention.Term as used herein "and/or" includes one or more relevant
The arbitrary combination of Listed Items.
It will be appreciated that though various elements, but this may be described using term first, second, third, etc. in the disclosure
A little elements should not necessarily be limited by these terms.These terms are only used for same type of element being distinguished from each other out.For example, not departing from
In the case of disclosure range, first element can also be referred to as second element, and similarly, second element can also be referred to as
One element.The use of provided in this article any and all example or exemplary language (" such as ", " such as ") is intended merely to more
Illustrate the embodiment of the present invention well, and unless the context requires otherwise, otherwise the scope of the present invention will not be applied and be limited.
Fig. 1 show overview flow chart according to the method for the present invention.It includes：Node is initiated to the control operation under node
Shi Shengcheng applied to lower control to operating and with the business datum chain of globally unique business number；By business datum chain from section
Be transmitted between point, from node-node transmission business datum chain when generate corresponding data group, the data group is all for recording
The operation log information of the slave node transmitted is simultaneously transferred to next from node；It can be to data group when receiving data group from node
It is verified, is decided whether to continue to execute business according to check results；When having executed all business from node or occurred abnormal
When, business datum chain is returned to initiating node.
Fig. 2 is shown controls communication process schematic diagram according to the system business of embodiment of the present invention.Subway light modulation projection
The control of system comes from two aspects：The control command that user is generated by remote terminal manual operation；Center service or domain
The control command that interior monitoring device is generated by task strategies such as regular, timing, conditions.
One completely Service control overall process information is controlled by the lower step by step of client to terminal device or third-party platform
Response message corresponding with one group returns up result composition step by step.No matter down control instruction or response message, can pass through a system
Row service node (logic) realizes that these nodes are dispersed in the entities such as center service, monitoring device, Mining and Control Device.
Fig. 3 show the control service logic process schematic according to embodiment of the present invention.It handles the following institute of logic
Show：
Each lower control operation can generate a business datum chain, and control can be multiple in the generation of initial service node under a configuration
Business datum chain, business datum chain can generate a globally unique business according to special algorithm simultaneously when generating its first time
It numbers (Bid), follow-up business number can inherit front service number.In addition in the service nodes of certain lower controls or return into industry
Business processing will appear point logic and generate multiple points of branches.The business number of each response message then comes from its corresponding lower control
Information, business number be carried out in each level entity identification when lower control information is analyzed with the check and correction of one group of response message according to
According to.
During Service control, service logic branch's micronization processes logic or business processing can occur in some service node
Abnormal conditions.It, can overall process record by being initially generated business datum chain to during finally returning that response message or exception throws
The data informations such as parameter, method that business processing is related to.
There are one globally unique field identifications (Nid) for each service node tool, often pass through a service node into industry
Business can all be generated after handling or one group of data of transfer, and the field identification of this group of data and service node can be used as the service node
Data flow is added record into business datum chain in be transferred to next service node.Simultaneously the node can be by all industry in front
The data flow of node of being engaged in and data stream carry out HMAC+Base64 algorithm for encryption and generate a data signature result
(Signature) it is transferred to next service node together.And the key that algorithm for encryption needs is buffered in this stage entity
Portion periodically issues acquisition step by step by center service by specific communications format.
Next service node receives the business datum chain of front service node push, needs first to do signature result verification
It just can be afterwards and carry out this node business processing, otherwise it is assumed that business datum is alerted extremely, terminate business processing.
The data flow of each service node is usually by one group of data to (Map<Key,Value>) constitute, specifically state format
Also can be diversified, each service node obtains corresponding data from business data-link as needed and realizes in practical business processing procedure
Oneself specific transactions.
Technical scheme of the present invention also discloses serializing and the inverted sequence of each phase Network communication message of business datum chain
Rowization requirement：
1) serializing requires, and first word of text section indicates that heading, end are ended up with 0XFF to be more than 0XF0 beginnings,
Message needs to do escape processing from second byte to penultimate byte if there is being more than 0XF0:
Such as by 0XF3 escapes be 0XF0 0X03.
2) unserializing requires, if it find that certain byte is equal to 0XF0 in message, with its follow-up bit combination and escape:
Such as 0XF0 0X0A escapes 0XFA.
3) serializing escape is carried out when either dynamic key communication formats or business datum chain format generate retransmits letter
It ceases, after reception information after first unserializing, then data format parses by definition
4) all done other than first byte and last byte due to communication message escape processing, first byte and last byte at
Special identifier can be applied to data frame identification, it can be achieved that efficient data communicates.
5) the dynamic Key data communication formats periodically issued step by step by center service, as shown in table 1 below：
Table 1
Explanation：All short, time_t32 use small tail end, i.e. low byte is preceding, and high byte is rear.
It controls downlink and responds the business datum chain data communication format of uplink, as shown in table 2 below：
Table 2
Explanation：All short use small tail end, i.e. low byte is preceding, and high byte is rear.
Remarks 1：The key meter of HMAC (HMAC-MD5, HMAC-SHA1, HMAC-SHA256, HMAC-SHA512)+base64
It calculates.Business datum chain is in service node internal structured format：Data flow architecture { integer node ID；Integer length；Character string
Content；}；Business chain structure { integer traffic ID；Character string cipher key calculation result；Data flow architecture stream container；}；
It should be appreciated that the embodiment of the present invention can be by computer hardware, the combination of hardware and software or by depositing
The computer instruction in non-transitory computer-readable memory is stored up to be effected or carried out.The method can be compiled using standard
Journey technology-includes that the non-transitory computer-readable storage media configured with computer program is realized in computer program,
In configured in this way storage medium computer is operated in a manner of specific and is predefined --- according in a particular embodiment
The method and attached drawing of description.Each program can with the programming language of level process or object-oriented come realize with department of computer science
System communication.However, if desired, the program can be realized with compilation or machine language.Under any circumstance, which can compile
The language translated or explained.In addition, the program can be run on the application-specific integrated circuit of programming for this purpose.
In addition, the operation of process described herein can be performed in any suitable order, unless herein in addition instruction or
Otherwise significantly with contradicted by context.Process described herein (or modification and/or a combination thereof) can be configured with can hold
It executes, and is can be used as jointly on the one or more processors under the control of one or more computer systems of row instruction
The code (for example, executable instruction, one or more computer program or one or more application) of execution, by hardware or its group
It closes to realize.The computer program includes the multiple instruction that can be executed by one or more processors.
Further, the method can be realized in being operably coupled to suitable any kind of computing platform, wrap
Include but be not limited to PC, mini-computer, main frame, work station, network or distributed computing environment, individual or integrated
Computer platform or communicated with charged particle tool or other imaging devices etc..Each aspect of the present invention can be to deposit
The machine readable code on non-transitory storage medium or equipment is stored up to realize no matter be moveable or be integrated to calculating
Platform, such as hard disk, optical reading and/or write-in storage medium, RAM, ROM so that it can be read by programmable calculator, when
Storage medium or equipment can be used for configuration and operation computer to execute process described herein when being read by computer.This
Outside, machine readable code, or part thereof can be transmitted by wired or wireless network.When such media include combining microprocessor
Or other data processors realize the instruction of steps described above or when program, invention as described herein including these and other not
The non-transitory computer-readable storage media of same type.When methods and techniques according to the present invention program, the present invention
It further include computer itself.
Computer program can be applied to input data to execute function as described herein, to convert input data with life
At storing to the output data of nonvolatile memory.Output information can also be applied to one or more output equipments as shown
Device.In the preferred embodiment of the invention, the data of conversion indicate physics and tangible object, including the object generated on display
Reason and the particular visual of physical objects are described.
The above, only presently preferred embodiments of the present invention, the invention is not limited in the above embodiments, as long as
It reaches the technique effect of the present invention with identical means, all within the spirits and principles of the present invention, any modification for being made,
Equivalent replacement, improvement etc., should be included within the scope of protection of the invention.Its technical solution within the scope of the present invention
And/or embodiment can have a variety of different modifications and variations.
Claims (8)
1. a kind of control method dimming optical projection system business datum chain based on subway, which is characterized in that this method includes：
Node is initiated to when controlling operation under node, is generated to being operated applied to lower control and with the industry of globally unique business number
Business data-link；
Business datum chain is transmitted between node, from node-node transmission business datum chain when generate corresponding data group,
The data group for record the operation log information from node and be added to business datum chain be transferred to it is next from node；
When accepting business data-link from node, business datum chain can be verified, decide whether to continue to hold according to check results
Industry is engaged in；
Wherein,
When executed it is all from the business of node when, return to business datum chain to initiating node；
When some node occurs abnormal, abnormality processing is attempted, when can not handle, carries out daily record output and alarm, and directly
Node is initiated from present node to return；
If without return, node meeting basis is accepted from the background, control business chain and time-out setting, real-time status has been descended to be proofreaded,
Response results are notified to initiate node.
2. the control method according to claim 1 for dimming optical projection system business datum chain based on subway, which is characterized in that
The node of initiating is the client terminal device that control operation is given under.
3. the control method according to claim 1 for dimming optical projection system business datum chain based on subway, which is characterized in that
It is described to be operated from node for executing lower control, it is described from Node distribution in entity apparatus, each from node, there are multiple business to grasp
Make, each from node after having handled business operation by globally unique node serial number, and, method involved by business operation,
Input parameter, output result and execution record etc. are added into data group in order, and data group is appended to business datum chain in order,
Wherein business operation includes but not limited to lower control operation and/or response business.
4. the control method according to claim 1 for dimming optical projection system business datum chain based on subway, which is characterized in that
The initiation node under node control operation include：
A corresponding business datum chain, the configurations that multiple lower control operations are formed are generated when lower control operates every time using node is initiated
Lower control can accept node into multiple business datum chains；
When business datum chain generates, generates corresponding globally unique business using assignment algorithm and number, business is numbered in node
Between transmission services data-link when inherited.
5. the control method according to claim 1 or 3 for being dimmed optical projection system business datum chain based on subway, feature are existed
In when from transmission services data-link between node generating corresponding data group includes the following steps：
When using next business datum chain pushed from node reception upper one from node, reads data signature result and simultaneously tested
Card, executes business processing, if not by reporting exception if being verified；
It reads in data group in the past from nodal operation log information, and believes operation log when own service complete from node processing
It breath and is added in the past from nodal operation log information, and is sent to business datum chain next from section from Node field mark
Point；
When sending, it is combined encryption by the data flow of itself and in the past from node data stream using HMAC and Base64, it is raw
It is sent to together at data signature result next from node；
Wherein, it is data pair from the data flow of node, the data are to including from Node field mark and operation log information；
Wherein, it is identified as globally unique identifier from Node field.
6. the control method according to claim 5 for dimming optical projection system business datum chain based on subway, which is characterized in that
The data signature result further includes：
The encryption key issued is received from center service be combined encryption from node every fixed time period,
Wherein, cipher key cache is in inside the corresponding entity apparatus of node；
Wherein, the encryption key that center service is issued every fixed time period is specific communications format.
7. the control method according to claim 5 for dimming optical projection system business datum chain based on subway, which is characterized in that
This method further includes：
When business datum chain is iterated through from node, re-calls the slave node controlled under executed and execute again, and will be every
A node, which executes business, can all be written data group to business datum chain.
8. the control method according to claim 1 for dimming optical projection system business datum chain based on subway, which is characterized in that
This method further includes：
It is described that multiple branch nodes are generated according to the difference of logical process when executing business processing from node, it will be from multiple branches
Node corresponds to basis of characterization when being analyzed from the business of node number as Information Proofreading.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810691434.9A CN108809731B (en) | 2018-06-28 | 2018-06-28 | Control method based on subway dimming projection system service data link |
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| CN201810691434.9A CN108809731B (en) | 2018-06-28 | 2018-06-28 | Control method based on subway dimming projection system service data link |
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| CN108809731B CN108809731B (en) | 2021-05-04 |
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| CN201810691434.9A Active CN108809731B (en) | 2018-06-28 | 2018-06-28 | Control method based on subway dimming projection system service data link |
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