CN111556104B - Seamless switching mode applied to multiple paths of acquired data - Google Patents
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- CN111556104B CN111556104B CN202010297708.3A CN202010297708A CN111556104B CN 111556104 B CN111556104 B CN 111556104B CN 202010297708 A CN202010297708 A CN 202010297708A CN 111556104 B CN111556104 B CN 111556104B
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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
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/2002—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where interconnections or communication control functionality are redundant
- G06F11/2012—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where interconnections or communication control functionality are redundant and using different communication protocols
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H04L45/24—Multipath
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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Abstract
The invention discloses a seamless switching mode applied to multipath acquired data, which comprises N first preprocessors, an application server and a remote terminal unit; the method comprises a data acquisition process of a first preprocessor x, a data uploading process of the data acquisition process, a process of data uploading of a data application process receiving uploading data of the data acquisition process, and a data preferential switching process of multiple paths of data application processes. The invention has the characteristics that the multipath data are all local, and the data application process can finish data preferred and realize seamless switching of path data.
Description
Technical Field
The invention relates to the technical field of data preference and dynamic switching after multi-channel data acquisition, in particular to a seamless switching mode applied to the multi-channel data acquisition.
Background
In many integrated monitoring systems, a preprocessor is often deployed between an application server and a remote terminal unit to complete data collection of a plurality of remote terminals with different data protocols. For a comprehensive monitoring system with higher data real-time performance and safety, such as a subway rail transit comprehensive monitoring system, when a single pre-processor has abnormal conditions such as machine faults or network faults, the comprehensive monitoring system has serious problems of data loss. Therefore, the integrated monitoring system often deploys a plurality of preprocessors to collect the remote terminal data in multiple ways, and one of the multiple ways of data needs to be selected as data application process for use, namely main path data. When the main path data is abnormal, the main path data can be dynamically and rapidly switched into the effective data of the other path, so that the real-time performance and the integrity of the data of the comprehensive monitoring system are ensured.
In the prior art, when a plurality of systems aim at multi-path data application, a plurality of preprocessors are communicated with each other or a third party technology is used for deciding a main preprocessor and a standby preprocessor, and the main preprocessor sends data to an application server, and the standby preprocessor does not work.
When a plurality of preprocessors are adopted to collect remote terminal data at the same time, if the main and standby path data of the preprocessors are used, communication needs to be established between the preprocessors, codes are written or the main and standby of the preprocessors are decided by means of a third-party technology, so that the complexity of development of a data collection process is greatly increased; secondly, the main and the standby of the pre-processor cannot represent the main and the standby of the path data on the current pre-processor, and the problem that the data on the main pre-processor is not good but still sent is solved; and the preprocessors need to communicate with each other, and switch the data uploading after deciding the main and the auxiliary after logic processing, which inevitably consumes a certain time in the process of switching the main and the auxiliary and the data uploading, and can cause data loss and data delay of the application server.
Disclosure of Invention
The invention aims to overcome the defects that the complexity of data acquisition process development is increased and the data loss and the data delay of an application server are caused when a plurality of preprocessors are adopted to acquire remote terminal data simultaneously in the prior art, and provides a seamless switching mode applied to data after multipath acquisition.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a seamless switching mode applied to multipath collected data comprises N preprocessors, an application server and a remote terminal unit, wherein N is more than 2; the method comprises a data acquisition process of an x-th preprocessor, a data uploading process of the data acquisition process, a process of receiving uploading data of the data acquisition process by a data application process, and a data preferential switching process of multiple paths of data of the data application process; x=1, 2,3, …, N;
and a data acquisition process of the data acquisition process:
(1-1) starting data acquisition by a data acquisition process of the xth preprocessor;
(1-2) calculating the health Cx of the acquisition path Lx at regular time; judging whether the connection between the data acquisition process and the acquisition path Lx of the remote terminal unit is normal or not; if Lx is abnormal, attempting to connect the remote terminal unit, and re-executing the step (1-1); if the acquisition path Lx is normal, the step (1-3) is carried out;
(1-3) the data acquisition process starts to communicate with the remote terminal, receives and analyzes the data, stores real-time data Ax, and records Ax to a change data queue if Ax is inconsistent with the data acquired and stored before the data acquisition process;
the calculation process of the collection path health Cx is as follows:
assuming that the data acquisition interval is 1 unit (1 unit is 1 second as the case may be), the value Fe is the recorded value of the e-th acquisition interval unit in the last 100 acquisition interval units, and if the acquisition path Lx is abnormal, the recorded value Fe is-2; if the acquisition path Lx is normal, the correct data record value Fe is received to be 1 in two acquisition interval units; the Fe value of the unreceived data record is-1; the received error data record value Fe is-2, the sum of the record values of the latest 100 acquisition interval units is counted, and the sum of the record values divided by 100 is the health degree of the acquisition path; where e=1, 2,3, …,100.
Since the acquisition delay is considered, here the two acquisition interval units are selected to have a received data record value Fe of 1, it is possible that 100 interval units have not recorded 100 values.
The preprocessors are mutually independent, do not communicate, and are only responsible for data acquisition and uploading; after receiving the multipath data, the application server completes data preference and switching according to a certain algorithm and rule according to the path health degree sent by the data acquisition process, and the data application process can complete seamless switching of the path data while completing data preference because the multipath data are all local.
The application server: a server running various application service processes.
Data application process: and finishing the processes of data processing, data providing and other business functions.
The preprocessor: and the microcomputer or the server for data uploading and control issuing of the application server is completed.
And (3) data acquisition process: and finishing the process of collecting the remote terminal data and uploading the data to the application server function.
Remote terminal unit: a special computer measurement and control unit with a modularized structure is designed aiming at longer communication distance and severe industrial field environment, and connects an end detection instrument and an executing mechanism with a host computer of a remote control center.
The invention solves the problems of preferential and dynamic seamless switching of the data after the multi-path data acquisition. The data acquisition process is deployed on the preprocessor, and the data application process is deployed on the application server. The data acquisition process on the preprocessor is connected with the remote terminal unit (the connection is called an acquisition path) to acquire and store the data of the remote terminal unit, and the health degree of the uploading path is calculated according to a certain algorithm. The data collected by the data collection process on the single preprocessor is single-path data, and the data collected by the data collection process on the plurality of preprocessors is multi-path data. And the data acquisition process transmits the data and the health degree of the acquisition path to the data application process on the application server.
The data application process on the application server receives the multiple paths of data on the plurality of preprocessors and stores the multiple paths of data and the health degree locally at the same time. The data acquisition process and the data application process adopt a TCP/IP protocol which is oriented to connection and safe and reliable, so that the safety and accuracy of data are ensured, all data are uploaded after connection is adopted for the data transmission mode, and then the mode of changing uploading is adopted, so that the pressure of data communication on a network is reduced, and the real-time performance of data uploading is improved. The data application process selects the data of the acquisition path with higher health degree as the main data and the data of other acquisition paths as the standby data according to the received health degree of the acquisition path. In order to prevent the continuous switching of the data of the acquisition path caused by the shaking of the health degree, the program sets a health degree threshold value of 10 percent, and the data of the acquisition path is not switched if the current health degree is lower than the highest health degree by less than 10 percent. The data application process continuously selects and updates the main path data in real time, and even if the main path changes, the reselected path data can also provide data for the application to use because the reselected path data is local, so that the dynamic seamless switching of the path data is realized.
Preferably, the data uploading process of the data acquisition process includes the following steps:
(2-1) starting data uploading by a data acquisition process of the xth preprocessor;
(2-2) judging whether the uploading paths Yx of the data acquisition process and the data application process are normal; if Yx is abnormal, re-executing the step (2-1); if Yx is normal, go to step (2-3);
(2-3) uploading the data Ax and the health Cx of the collection path Lx to a data application process of the application server by the data collection process; and (3) re-executing the step (2-1).
Preferably, the process of the data application process receiving the data acquisition process and uploading the data comprises the following steps:
(3-1) starting monitoring by the data application process, and receiving an uploading path Yx of the data acquisition process;
(3-2) judging whether an uploading path Yx of the data acquisition process of the xth preprocessor is received, if the uploading path Yx is not received, setting the uploading path Yx as abnormal, and re-executing the step (3-1); if the up-feed path Yx is normal; step (3-3)
And (3-3) receiving and storing the data Ax and the health degree Cx of the up-feed acquisition path Lx of the data acquisition process, wherein the storage sequence and the structure of the data Ax in the memory are completely consistent.
Preferably, the data preferential switching process of the data application process multipath comprises the following steps:
(4-1) the data application process on the application server starting to perform multi-way data preference;
(4-2) initializing the maximum value Cmn of the health degree to be 0%, and circularly judging whether the upstream acquisition process of the x-th pre-processor and the upstream path Yx of the data application process are normal or not by the data application process; if the uploading path Yx is normal, judging whether the health degree Cx of the collecting path Lx meets Cx > Cmn, if so, cmn=cx; x=1, 2,3, …, N;
(4-3) in order to prevent the selected data from being jittered and switched, judging whether an acquisition path has been selected before, if the acquisition path Lmo has been selected, judging whether the current acquisition path Cmo meets Cmo > (Cmn-10%), if so, not switching the data, still using the data Amo as application data, and otherwise switching the data amb as application data; mo is one of 1,2,3, …, N; mn is one of 1,2,3, …, N;
(4-4) storing the data Amo and Amn in a local memory, wherein the data storage sequence and the data storage structure are consistent; and the application data switching is only performed on the pointer corresponding to the data Amn to perform locking switching, so that seamless switching of the data is realized.
Therefore, the invention has the following beneficial effects: the pre-processors are mutually independent and have no communication, and the module logic is simple and consistent and only takes charge of data acquisition and uploading; after receiving the multipath data, the application server completes data preference and switching according to a certain algorithm and rule according to the health degree of the acquisition path sent by the data acquisition process, and the multipath data are stored in the local memory, and the sequence and the structure of the memory are consistent, so that the switching of the multipath data is only aimed at locking switching of the pointer corresponding to the data, and seamless switching of path data can be realized when the data application process completes data preference.
Drawings
FIG. 1 is a block diagram of a system for multi-way data acquisition and upload in accordance with the present invention;
FIG. 2 is a data acquisition process diagram of a data acquisition process of the present invention;
FIG. 3 is a diagram of a data collection process and data upload process according to the present invention;
FIG. 4 is a diagram of a data application process data receiving process of the present invention;
fig. 5 is a diagram of a data application process multi-path data preferential process of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As shown in FIG. 1, a system structure diagram for multi-path data acquisition and uploading
Comprises 2 preprocessors 1, an application server 2 and a remote terminal unit 3; the method comprises a data acquisition process of an x-th preprocessor, a data uploading process of the data acquisition process, a process of receiving uploading data of the data acquisition process by a data application process, and a data preferential switching process of multiple paths of data of the data application process;
the 1 st preprocessor is connected with the data application process of the application server through the uploading path Y1 and uploads the data A1 and the health degree C1 of the acquisition path L1;
the data acquisition process of the 2 nd preprocessor acquires the data A2 of the remote terminal unit through an acquisition path L2 and calculates the health degree C2 of the acquisition path L2, and the 2 nd preprocessor is connected with the data application process of the application server through an uploading path Y2 and uploads the data A2 and the health degree C2 of the acquisition path L2; the application server receives the data A1 and the health degree C1 of the acquisition path L1 and the data A2 and the health degree C2 of the acquisition path L2.
As shown in fig. 2, a data acquisition process is a data acquisition process:
(1-1) starting data acquisition by a data acquisition process of the xth preprocessor;
(1-2) calculating the health Cx of the acquisition path Lx at regular time; judging whether the connection between the data acquisition process and the acquisition path Lx of the remote terminal unit is normal or not; if Lx is abnormal, attempting to connect the remote terminal unit, and re-executing the step (1-1); if the acquisition path Lx is normal, the step (1-3) is carried out;
(1-3) the data acquisition process starts to communicate with the remote terminal unit, receives and analyzes the data, stores real-time data Ax, and records Ax to a change data queue if Ax is inconsistent with the data acquired and stored before the data acquisition process;
the calculation process of the collection path health Cx is as follows:
assuming that the data acquisition interval is 1 unit, the value Fe is the recorded value of the e-th acquisition interval unit in the last 100 acquisition interval units, and if the abnormal recorded value Fe of the acquisition path Lx is-2; if the acquisition path Lx is normal, the correct data record value Fe is received to be 1 in two acquisition interval units; the Fe value of the unreceived data record is-1; the received error data record value Fe is-2, the sum of the record values of the latest 100 acquisition interval units is counted, and the sum of the record values divided by 100 is the health degree of the acquisition path Lx; where e=1, 2,3, …,100.
As shown in fig. 3, the data uploading process of the data acquisition process:
(2-1) starting data uploading by a data acquisition process of the xth preprocessor;
(2-2) judging whether the uploading paths Yx of the data acquisition process and the data application process are normal; if Yx is abnormal, re-executing the step (2-1); if Yx is normal, go to step (2-3);
(2-3) uploading the data Ax and the health Cx of the collection path Lx to a data application process of the application server by the data collection process; and (3) re-executing the step (2-1).
As shown in fig. 4, the data preferential switching process of the data application process multiplexing:
(3-1) starting monitoring by the data application process, and receiving an uploading path Yx of the data acquisition process;
(3-2) judging whether an uploading path Yx of the data acquisition process of the xth preprocessor is received, if the uploading path Yx is not received, setting the uploading path Yx as abnormal, and re-executing the step (3-1); if the up-feed path Yx is normal; step (3-3)
And (3-3) receiving and storing the data Ax and the health degree Cx of the up-feed acquisition path Lx of the data acquisition process, wherein the storage sequence and the structure of the data Ax in the memory are completely consistent.
As shown in fig. 5, the process multi-way data preference procedure is applied to data
The process of data application process multi-path data preference is illustrated. The following operations are all completed in the data application process.
The data preferential switching process of the data application process multipath comprises the following steps:
(4-1) the data application process on the application server starting to perform multi-way data preference;
(4-2) initializing the maximum value Cmn of the health degree to be 0%, and circularly judging whether the upstream acquisition process of the x-th pre-processor and the upstream path Yx of the data application process are normal or not by the data application process; if the uploading path Yx is normal, judging whether the health degree Cx of the collecting path Lx meets Cx > Cmn, if so, cmn=cx; x=1, 2,3, …, N;
(4-3) in order to prevent the selected data from being jittered and switched, judging whether an acquisition path has been selected before, if the acquisition path Lmo has been selected, judging whether the current acquisition path Cmo meets Cmo > (Cmn-10%), if so, not switching the data, still using the data Amo as application data, and otherwise switching the data amb as application data; mo is one of 1,2,3, …, N; mn is one of 1,2,3, …, N;
(4-4) storing the data Amo and Amn in a local memory, wherein the data storage sequence and the data storage structure are consistent; and the application data switching is only performed on the pointer corresponding to the data Amn to perform locking switching, so that seamless switching of the data is realized.
It should be understood that the examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (3)
1. A seamless switching mode applied to multipath collected data is characterized by comprising N preprocessors (1), an application server (2) and a remote terminal unit (3), wherein N is more than 2; the method comprises a data acquisition process of an x-th preprocessor, a data uploading process of the data acquisition process, a process of receiving uploading data of the data acquisition process by a data application process, and a data preferential switching process of multiple paths of data of the data application process; x=1, 2,3, …, N;
and a data acquisition process of the data acquisition process:
(1-1) starting data acquisition by a data acquisition process of the xth preprocessor;
(1-2) calculating the health Cx of the acquisition path Lx at regular time; judging whether the connection between the data acquisition process and the acquisition path Lx of the remote terminal unit is normal or not; if Lx is abnormal, attempting to connect the remote terminal unit, and re-executing the step (1-1); if the acquisition path Lx is normal, the step (1-3) is carried out;
(1-3) the data acquisition process starts to communicate with the remote terminal unit, receives and analyzes the data, stores real-time data Ax, and records Ax to a change data queue if Ax is inconsistent with the data acquired and stored before the data acquisition process;
the calculation process of the collection path health Cx is as follows: assuming that the data acquisition interval is 1 unit, the value Fe is the recorded value of the e-th acquisition interval unit in the last 100 acquisition interval units, and if the abnormal recorded value Fe of the acquisition path Lx is-2; if the acquisition path Lx is normal, the correct data record value Fe is received to be 1 in two acquisition interval units; the Fe value of the unreceived data record is-1; the received error data record value Fe is-2, the sum of the record values of the latest 100 acquisition interval units is counted, and the sum of the record values divided by 100 is the health degree of the acquisition path Lx; wherein e = 1,2,3, …,100;
the data preferential switching process of the data application process multipath comprises the following steps:
(4-1) the data application process on the application server starting to perform multi-way data preference;
(4-2) initializing the maximum value Cmn of the health degree to be 0%, and circularly judging whether the upstream acquisition process of the x-th pre-processor and the upstream path Yx of the data application process are normal or not by the data application process; if the uploading path Yx is normal, judging whether the health degree Cx of the collecting path Lx meets Cx > Cmn, if so, cmn=cx; x=1, 2,3, …, N;
(4-3) in order to prevent the selected data from being jittered and switched, judging whether an acquisition path has been selected before, if the acquisition path Lmo has been selected, judging whether the current acquisition path Cmo meets Cmo > (Cmn-10%), if so, not switching the data, still using the data Amo as application data, and otherwise switching the data amb as application data; mo is one of 1,2,3, …, N; mn is one of 1,2,3, …, N;
(4-4) storing the data Amo and Amn in a local memory, wherein the data storage sequence and the data storage structure are consistent; and the application data switching is only performed on the pointer corresponding to the data Amn to perform locking switching, so that seamless switching of the data is realized.
2. The seamless switching method for multi-channel acquired data according to claim 1, wherein the data uploading process of the data acquisition process comprises the following steps:
(2-1) starting data uploading by a data acquisition process of the xth preprocessor;
(2-2) judging whether the uploading paths Yx of the data acquisition process and the data application process are normal; if Yx is abnormal, re-executing the step (2-1); if Yx is normal, go to step (2-3);
(2-3) uploading the data Ax and the health Cx of the collection path Lx to a data application process of the application server by the data collection process; and (3) re-executing the step (2-1).
3. The seamless switching method for multi-channel data acquisition according to claim 1, wherein the process of receiving the data acquisition process and uploading the data by the data application process comprises the following steps:
(3-1) starting monitoring by the data application process, and receiving an uploading path Yx of the data acquisition process;
(3-2) judging whether an uploading path Yx of the data acquisition process of the xth preprocessor is received, if the uploading path Yx is not received, setting the uploading path Yx as abnormal, and re-executing the step (3-1); if the up-feed path Yx is normal; turning to the step (3-3);
and (3-3) receiving and storing the data Ax and the health degree Cx of the up-feed acquisition path Lx of the data acquisition process, wherein the storage sequence and the structure of the data Ax in the memory are completely consistent.
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