CN1180607C - Method of realizing dynamic control of distribution system using state array of time slot - Google Patents
Method of realizing dynamic control of distribution system using state array of time slot Download PDFInfo
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- CN1180607C CN1180607C CNB021040060A CN02104006A CN1180607C CN 1180607 C CN1180607 C CN 1180607C CN B021040060 A CNB021040060 A CN B021040060A CN 02104006 A CN02104006 A CN 02104006A CN 1180607 C CN1180607 C CN 1180607C
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Abstract
The present invention relates to a method of realizing the dynamic control of a distribution system by using a state array of a time slot, which utilizes the state array of the time slot to realize the time slot function of the distribution system; thereby, the dynamic control relevant to the time is provided for a relevant module. In the distribution system, the method has a comparatively simple technical measure and can reduce the quantity of synchronous data transmitted between a master control board and an interface board, namely that on the basis of the low load of the master control board, the control function of each time slot can be ensured to be accurately realized in real time and high efficiency simultaneously. A firewall module is taken as an example to show how the method of the present invention realizes the time slot function with quickness, low resource occupation and simple synchronous method in the distribution system composed of the master control board and the interface board. The time slot function has the characteristic of high independence and can be very conveniently used for other modules requiring of time control.
Description
Affiliated field
The present invention relates to the method that a kind of state array of utilizing the time period realizes the dynamic control of distributed system, exactly, relate to the time period function that a kind of state array of utilizing the time period realizes distributed system, thereby for correlation module provides method with the dynamic control of time correlation, this method belongs to the IP communication technical field.
Background technology
In the IP communications field, there are part of module or agreement need finish the function of dynamic control according to the time period that the user sets.With the fire compartment wall on the router is example: the user may use the firewall rule of a cover appointment in some time ranges when setting firewall rule, and in another time period, use another set of firewall rule, and require the conversion of these two kinds of rules to finish automatically by system.This problem can be solved by the time period function, and it only needs the user to divide the different time periods according to demand in advance, and then that these are the different time periods is distributed to corresponding different fire-proof rule, and remaining work just can have been finished automatically by system.
Distributed system generally (for example: the equipment such as access server of applicant's development) is made up of master control borad and a plurality of interface board.Wherein master control borad is born the centralized control of equipment, the function of management, the common features of each interface board of realizing different business is focused on, and then be distributed to each interface board.Each interface board more is to be concerned about own professional processing and realization.For common features, distributed system generally adopts synchronous mechanism, by the management of master control borad realization common features, as configuration, modification and operation.The synchronous transmission as a result that to handle then arrives each interface board for its use.Master control borad normally provides the dynamic control of common features and management function according to the time period for its correlation module.The advantage of this distributed system is: control and management is more convenient fast, and improves systematic function and save system resource or the like, so obtained to use widely in fields such as telecommunications.
Usually, time period comprise an absolute time section and a plurality of cycle time section.The absolute time section is a continuous time range, and clear and definite zero-time and concluding time are arranged, as: 2001/10/1 6:00...2001/10/30 20:00.Cycle time, section more approached descriptive statement, as: Monday weekly is to Wednesday; 6:00 on every Saturdays is to 20:00; Weekend weekly (Saturday and Sunday) or the like.Cycle time, section all was to be unit with the week, the expression weekly certain timeslice or certain several timeslice weekly.Section depended on the absolute time section and existed cycle time, and the timeslice of indication cycle's time period is all in the specified time range of absolute time.Each time period all is provided with a slot number, all is provided with a rule number as each firewall rule.In distributed system, master control borad just can be realized the dynamically function of control as long as corresponding slot number is distributed to the module that need control and manage in this time period.
Data structure schematic diagram referring to time period tabulation shown in Figure 1, wherein the absolute time section leaves in the array, each absolute time section in this array following is designated as time number, claims slot number or call number again, because be with the sequence number of this slot number as index in this array.Cycle time, Duan Ze linked with corresponding absolute time section under it with the form of single-track link table, represented a plurality of cycle time of the section under this absolute time section.
Summary of the invention
The purpose of this invention is to provide the method that a kind of state array of utilizing the time period realizes the dynamic control of distributed system, just a kind of state array of utilizing the time period realizes the time period function of distributed system, thereby provides method with the dynamic control of time correlation for corresponding module.In distributed system, the technological means of this method is fairly simple, can reduce the synchrodata amount of transmitting between master control borad and each interface board, promptly on the basis of master control borad underload, guarantee simultaneously that the controlled function of each time period can be accurately, in real time, realize efficiently.
The object of the present invention is achieved like this: a kind of state array of utilizing the time period realizes the method for the dynamic control of distributed system, and it is characterized in that: this method includes the following step:
(1) the time segment table is set on master control borad, a variable also is set identifies each time period as the identifier of time period and whether be in current time;
(2) a time period state array is set and represents the different conditions of time periods all on this master control borad in the current time, element number in this time period state array should equal the number of all time periods, and the state whether numerical value of each element is in the current time with its pairing each time period respectively is corresponding;
(3) when opening the time period function, start each time period of timer timing scan simultaneously at the state of current time, each state value that it obtained is write in the time corresponding section state array then; Meanwhile, should time period status number group distinguish copy backup to each interface board, and during the each refresh time section of the time period module state array on master control borad, master control borad also will have the slot number of state variation to notify each interface board, so that the time period state array of each interface board and master control borad are realized synchronously.
Whether to be in the variable of current time each time period be to represent respectively that with two different numerical value of this variable current time is in the time range of this time period and current time two kinds of different conditions in the time range of this time period not to sign in described (1) step.
Described current time is the situation in the time range of this time period, comprises that current time is in this time section boundary constantly just.
Described variable is represented with a binary digit with " 1 ", " 0 " two kinds of different numerical value.
The time interval of timer timing scan is 10-50 second in described (3) step.
The time interval of described timer timing scan is the system response time after the identifier configurations of time period is changed.
This method further includes following step:
(4) each permission (permit) in the Access Control List (ACL) on master control borad/forbid that (deny) description entry expands a territory, is used to deposit the slot number of configuration; Time period state array then regularly refreshes, and the current state of corresponding slot number is left in wherein;
(5) each bar is being allowed (permit)/forbid that (deny) is when description entry mates, in time period state array, search current state of this time period according to the slot number of configuration earlier, if its numerical value shows that this rule is effective in the current time, proceed the comparison of other attributes; If its numerical value shows that this rule is invalid in the current time, proceed matching ratio that next bar allowed/forbade description entry; So can carry out the controlled function of corresponding time period.
It is in the time range in this time period that the numerical value of the 0th element in described (4) step in the time period state array is set to current time, and this numerical value is constant all the time.
Its rule is permanently effective and when not changing in time, the time period that this is regular is distributed in the time period No. 0 requiring one.
Characteristics of the present invention are to propose a kind of very simple form-time period state array-be used for realizing the time period function in distributed system.The a plurality of identifier whether this time period state array is in current time by each time period of sign is formed, it provides strong, a simple in structure interface very easy to use again of independence to realize the time controlled function towards other modules, and the cost that realizes is very little.Therefore, when this method was implemented in distributed systems, the signal between master control borad and each interface board was few alternately, and the data volume of exchange is also very little; Each interface board only need one with the synchronous time period state array of master control borad just can usage time interval function.The time range that the present invention can need to set according to the user in distributed system (for example: be widely used fire compartment wall) realizes dynamic difference in functionality module of controlling or agreement.
Description of drawings
Fig. 1 is the data structure schematic diagram of time period tabulation.
Fig. 2 is the schematic diagram that concerns of time period state array and time segment table.
Fig. 3 is that the present invention utilizes the state array of time period to realize time period function with time correlation in distributed system, thereby the method schematic diagram of dynamic control is provided for correlation module.
Fig. 4 is one embodiment of the invention: utilize the state array of time period to realize the interface schematic diagram of firewall functionality in distributed system.
Embodiment
Referring to Fig. 2 and Fig. 3, the present invention is the method that a kind of state array of utilizing the time period realizes the dynamic control of distributed system, and this method includes the following step:
The time segment table at first is set on master control borad, a variable also is set, and to identify each slot number as the identifier of time period be time period of m whether to be in current time, because in some moment, for slot number is time period of m to have only two kinds of situations, that is: current time in the time range of this time period m, (comprise that current time is positioned at this time section boundary constantly just) and the current time not in the time range of this time period m.Identifying this state variable can represent with a binary digit with " 1 ", " 0 " two kinds of different numerical value, as: 1 is illustrated in the current time scope, and 0 expression is not in the current time scope.
The so-called time period state array that its element number equals the time period number is set again represents that each time period is at the different conditions of current time on this master control borad, the number of the element in this time period state array should equal the number of all time periods, and the state whether numerical value of each element is in the current time with its pairing each time period respectively is corresponding;
Then, when opening the time period function, start a timer simultaneously and come each time period of timing scan, each state value that it obtained is write in the time corresponding section state array (as shown in Figure 2) then at the state of current time; Because the time period function is not very high to the requirement of time precision, generally be minute being unit.So setting the time interval of timer timing scan can be 10-50 second (for example 20 seconds, promptly per 20 seconds run-downs).This time interval also is simultaneously the system response time after the identifier configurations of time period is changed; That is to say after the user has changed a time period configuration this configuration generation effect in 20 seconds time at most.Meanwhile, should time period status number group distinguish copy backup to each interface board, and during the each refresh time section of the time period module state array on master control borad, master control borad also will have the slot number of state variation each interface board of issuing a notice, be " variation of state array issues with the time period " shown in Fig. 3, so that make the time period state array of each interface board A, B, C and master control borad realize (as shown in Figure 3) synchronously.
In distributed system, require the common configuration of each veneer to want synchronously.Time period state array can realize the time period function of distributed system very simply.Method of the present invention not be used in and all keeps a time segment table on each veneer, only need by master control borad resting period segment table and time period state array, and backup that other interface boards are preserved a time period state array just.During the each refresh time section of time period module state array on master control borad, master control borad will have the slot number of state variation to be notified to interface board just can realize the synchronous of time period state array.Being time period of 1 such as: slot number changes refreshing the back state, and master control borad only needs the status values of slot number 1 is issued each interface board.Each interface board is received after this message the element value that is designated as 1 in the time period state array down made amendment and is got final product.
Referring to Fig. 4, with the fire compartment wall example below, illustrate that the application of this method time period also further includes following step:
(4) each permission (permit) in the Access Control List (ACL) on master control borad/forbid that (deny) description entry expands a territory, is used to deposit the slot number of configuration; And time period state array timing (for example 20 seconds) wherein refreshes, and what deposit is the current state of corresponding slot number;
(5) like this, in the process of packet filtering, each bar is being allowed/when forbidding that description entry mates, at first in time period state array, search current state of this time period according to the slot number of configuration, if its numerical value shows this rule and current time effective (for example being 1), proceeds the comparison of other attributes; If its numerical value shows this rule and current time invalid (for example being 0), proceeds the comparison that next bar allowed/forbade description entry; So can carry out the controlled function of corresponding time period.
It is in the time range of this time period that the numerical value of 0th element of method of the present invention in can time period state array is set to current time, and promptly its value is always 1, and this numerical value is constant all the time.Require a certain rule permanently effective and when not changing in time, time period that should rule can be distributed in the time period No. 0.
Can see that from this embodiment though fire compartment wall has realized dynamically changing according to the time function of configuration, the cost of its realization is very little.In time: only increase by one in the rule match of packet filtering and judged statement, very little to effectiveness affects; Spatially, only be that the permit/deny description entry has increased a territory and is used for the resting period segment number.Because these characteristics, can method of the present invention be applied to other at an easy rate need be by the module of time period state of a control.
Method of the present invention has been implemented test in the access server equipment of applicant's development, be mainly used in the time controlled function of realization to fire compartment wall, and the result of test is successful, has realized goal of the invention.
Claims (9)
1, a kind of state array of utilizing the time period realizes the method for the dynamic control of distributed system, and it is characterized in that: this method includes the following step:
(1) the time segment table is set on master control borad, a variable also is set identifies each time period as the identifier of time period and whether be in current time;
(2) a time period state array is set and represents the different conditions of time periods all on this master control borad in the current time, element number in this time period state array should equal the number of all time periods, and the state whether numerical value of each element is in the current time with its pairing each time period respectively is corresponding;
(3) when opening the time period function, start each time period of timer timing scan simultaneously at the state of current time, each state value that it obtained is write in the time corresponding section state array then; Meanwhile, should time period status number group distinguish copy backup to each interface board, and during the each refresh time section of the time period module state array on master control borad, master control borad also will have the slot number of state variation to notify each interface board, so that the time period state array of each interface board and master control borad are realized synchronously.
2, the state array of utilizing the time period according to claim 1 realizes the method for the dynamic control of distributed system, it is characterized in that: whether to be in the variable of current time be to represent respectively that with two different numerical value of this variable current time is in the time range of this time period and current time two kinds of different conditions in the time range of this time period not each time period of sign in described (1) step.
3, the state array of utilizing the time period according to claim 2 realizes the method for the dynamic control of distributed system, it is characterized in that: described current time is the situation in the time range of this time period, comprises that current time is in this time section boundary constantly just.
4, the state array of utilizing the time period according to claim 2 realizes the method for the dynamic control of distributed system, and it is characterized in that: described variable is represented with a binary digit with " 1 ", " 0 " two kinds of different numerical value.
5, the state array of utilizing the time period according to claim 1 realizes the method for the dynamic control of distributed system, and it is characterized in that: the time interval of timer timing scan is 10-50 second in described (3) step.
6, utilize the state array of time period to realize the method for the dynamic control of distributed system according to claim 1 or 5, it is characterized in that: the time interval of described timer timing scan is the system response time after the identifier configurations change of time period.
7, the state array of utilizing the time period according to claim 1 realizes the method for the dynamic control of distributed system, and it is characterized in that: this method further includes following step:
(4) each permission in the Access Control List (ACL) on master control borad/forbid that description entry expands a territory, is used to deposit the slot number of configuration; Time period state array then regularly refreshes, and the current state of corresponding slot number is left in wherein;
(5) each bar is being allowed/when forbidding that description entry mates, in time period state array, search current state of this time period according to the slot number of configuration earlier,, proceeding the comparison of other attributes if its numerical value shows that this rule is effective in the current time; If its numerical value shows that this rule is invalid in the current time, proceed matching ratio that next bar allowed/forbade description entry.
8, the state array of utilizing the time period according to claim 7 realizes the method for the dynamic control of distributed system, it is characterized in that: it is in the time range in this time period that the numerical value of the 0th element in described (4) step in the time period state array is set to current time, and this numerical value is constant all the time.
9, realize the method for the dynamic control of distributed system according to claim 7 or the 8 described state arrays of utilizing the time period, it is characterized in that: its rule is permanently effective and when not changing in time, the time period that this is regular is distributed in the time period No. 0 requiring one.
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| CN100437423C (en) * | 2006-07-07 | 2008-11-26 | 中国科学院力学研究所 | Computer distribution type system time synchronous method |
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| EP2391032B8 (en) | 2009-01-23 | 2019-12-11 | Alcatel Lucent | Synchronization method and device for real-time distributed system |
| CN107991979B (en) * | 2017-11-17 | 2019-05-21 | 通用电气（武汉）自动化有限公司 | A kind of array scan-type control method |
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| CN100437423C (en) * | 2006-07-07 | 2008-11-26 | 中国科学院力学研究所 | Computer distribution type system time synchronous method |
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