CN104796390A - Electronic whiteboard whole-network synchronous undoing and recovering system and method thereof - Google Patents
Electronic whiteboard whole-network synchronous undoing and recovering system and method thereof Download PDFInfo
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- CN104796390A CN104796390A CN201410029698.XA CN201410029698A CN104796390A CN 104796390 A CN104796390 A CN 104796390A CN 201410029698 A CN201410029698 A CN 201410029698A CN 104796390 A CN104796390 A CN 104796390A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
- H04L65/1104—Session initiation protocol [SIP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/40—Support for services or applications
- H04L65/403—Arrangements for multi-party communication, e.g. for conferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
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Abstract
The invention provides an electronic whiteboard whole-network synchronous undoing and recovering system and a method thereof. The system comprises a root electronic whiteboard server, a plurality of sub electronic whiteboard servers and a plurality of electronic whiteboard clients. The root electronic whiteboard server is connected with one or more sub electronic whiteboard servers or the electronic whiteboard clients, each sub electronic whiteboard server is connected with one or more sub electronic whiteboard servers or the electronic whiteboard clients, and thus, a multi-level tree-shaped structure is formed. According to the electronic whiteboard whole-network synchronous undoing and recovering system and the method thereof, the root electronic whiteboard server completes unified control and management on undoing and recovering operation data of all electronic whiteboards in the whole system, the other sub electronic whiteboard servers perform uploading and releasing of undoing and recovering operation data, the electronic whiteboard client does not need a related undoing and recovering function module, and thus processing of the electronic whiteboard client is simplified.
Description
Technical field
The present invention relates to a kind of technical field of electronic whiteboard, particularly relate to a kind of electronic whiteboard the whole network and synchronously cancel and the system recovered and method thereof.
Background technology
Electronic whiteboard is a kind of new high-tech product summarizing the multiple high-tech means such as sophisticated electronic technology, software engineering.In conjunction with computer and projector, electronic whiteboard can realize non-support cable and teaching, and it can be write as direct pen common blank or blackboard for education, is then passed in computer and goes, relative to projector, common blank etc., electronic whiteboard has the advantage of self uniqueness.
Interactive electric whiteboard can carry out information communication with computer, and electronic whiteboard is connected to computer, and utilizes projector by the content projection on computer on electronic whiteboard screen.Under the support of special application program, a large-screen, interactively cooperation meeting or teaching environment can be constructed, thus directly can edit file on electronic whiteboard, annotate, any operation that preservation etc. can realize on computers.At present, remote interaction electric whiteboard system can be widely used in multimedia netmeeting, tele-medicine, military explanation commander, vehicle scheduling, teaching, speech, ecommerce, working report, product introduction meeting, training, scientific research, engineering, Project design, security commentary, amusement and perform in a radio or TV programme, physical culture, map, meteorology, astronomy, interactive bulletin, hotel, universities, middle and primary schools the place linked up of the far and near journey of needs such as electronic teaching.
In the utilization of remote interaction electronic whiteboard, for the faulty operation of adding in electronic whiteboard, need to carry out destruction operation.Now just need use to cancel function, and the processing procedure of cancelling of existing electronic whiteboard is all cancelled by this locality.Remote interaction formula electronic whiteboard as the development trend of the present and the future's blank, the cancelling and recover also to need to carry out interactive processing of electronic whiteboard, thus reach the synchronous effect of the whole network.And cancelling and recovering all client-based electronic whiteboard of existing electronic whiteboard is carried out.
Summary of the invention
The shortcoming of prior art in view of the above, the system that the object of the present invention is to provide a kind of electronic whiteboard the whole network synchronously to cancel and to recover and method thereof, using server as the Data Source of destruction operation, to carry out in whole network synchronously cancelling of faulty operation in all electronic whiteboards, and electronic whiteboard client does not just need to cancel and recover relevant functional module, only need will cancel and regard general operation with recovery operation and process, cancelling and recovering data and also process with general data simultaneously to sending over from electronic white board server of receiving.
For achieving the above object and other relevant objects, the invention provides the system that a kind of electronic whiteboard the whole network is synchronously cancelled and recovered, comprise root electronic white board server, some sub-electronic white board server and some electronic whiteboard clients; Wherein, one or more described sub-electronic white board server or described electronic whiteboard client is connected under described root electronic white board server, connect one or more described sub-electronic white board server or described electronic whiteboard client under each described sub-electronic white board server, thus form multistage tree structure; Described electronic white board server comprises synchrodata processing module, cancels and recovery operation command processing module; Described synchrodata processing module comprises data reception module, data transmission blocks and data simultaneous module; Described cancel to comprise with recovery operation command processing module cancel with recovery operation control module and cancel and recovery operation processing module; Described electronic whiteboard client comprises operating data sending module, operating data receiving processing module; Electronic whiteboard client carry out the whole network synchronously cancel with recovery operation time, what complete all electronic whiteboards in whole system by described root electronic white board server cancels the data unified control and management with recovery operation, and other sub-electronic white board server carry out cancelling and the uploading and assigning of recovery operation data; And described electronic whiteboard client only needs to process cancelling as general operation with recovery operation, cancelling and recovering data and also process according to general data simultaneously to sending over from electronic white board server of receiving.
According to the system that above-mentioned electronic whiteboard the whole network is synchronously cancelled and recovered, wherein: the data structure of described root electronic white board server comprise an operating procedure queue and one cancel recovery steering needle; The element of described operating procedure queue is an electronic whiteboard object linked list head pointer, each element in electronic whiteboard object chained list is an electronic whiteboard object data, all electronic whiteboard object datas in electronic whiteboard when each electronic whiteboard object chained list comprises current operation.
Further, according to the system that above-mentioned electronic whiteboard the whole network is synchronously cancelled and recovered, wherein: add, delete and revise electronic whiteboard object encoding each time and carried out the operation of primary electron blank; The tail of the queue of element to operating procedure queue of an operating procedure queue is then added in electronic whiteboard operation each time; The element comprised in newly-generated electronic whiteboard object chained list is the element comprised the electronic whiteboard object chained list pointed by the last tail of the queue of operating procedure queue, obtains after carrying out this electronic whiteboard operation
Meanwhile, the present invention also provides a kind of electronic whiteboard the whole network described above synchronously to cancel and the cancelling and restoration methods of the system recovered, and it comprises the following steps:
Step S1: electronic white board server receives the electronic whiteboard data that network sends, and judges the source of these electronic whiteboard data; If from the data of father's electronic white board server, then proceed to step S2; If from the data of electronic whiteboard client or other sub-electronic white board server, then proceed to step S3;
Step S2: the data in this electronic white board server and father's electronic white board server data are consistent, simultaneously by electronic whiteboard data retransmission to being connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server, finally make the data of electronic white board server all in whole electric whiteboard system and all electronic whiteboard clients be consistent;
Step S3: parse cancelling and recovery operation order in electronic whiteboard data, and judge whether this electronic white board server is root electronic white board server;
If root electronic white board server, then undertaken cancelling and recovery operation process by root electronic white board server;
If not root electronic white board server, then will cancel with recovery operation transferring order to father's electronic white board server of this electronic white board server; Then above-mentioned judgement is re-started to described father's electronic white board server, until cancelling in electronic whiteboard data is sent to root electronic white board server with recovery operation order, undertaken cancelling and recovery operation process by root electronic white board server.
According to the method that above-mentioned electronic whiteboard the whole network is synchronously cancelled and recovered, wherein: the data structure of described root electronic white board server comprise an operating procedure queue and one cancel recovery steering needle; The element of described operating procedure queue is an electronic whiteboard object linked list head pointer, each element in electronic whiteboard object chained list is an electronic whiteboard object data, all electronic whiteboard object datas in electronic whiteboard when each electronic whiteboard object chained list comprises current operation.
Further, according to the method that above-mentioned electronic whiteboard the whole network is synchronously cancelled and recovered, wherein: in step S3, if carry out destruction operation, then judge whether cancel recovery steering needle points to same node point with the head pointer of operating procedure queue, if identical, be then irritancy order, do not perform any operation; If different, then call to cancel and carry out destruction operation with recovery operation processing module.
Further, according to the method that above-mentioned electronic whiteboard the whole network is synchronously cancelled and recovered, wherein: when carrying out destruction operation, recover electronic whiteboard object chained list that steering needle points to cancelling and recover the element that steering needle subtracts in the electronic whiteboard object chained list of a sensing by cancelling and compare one by one, find out respectively in the electronic whiteboard object chained list of cancelling and recovering steering needle sensing and be added, the linked list element deleted and revise, do contrary operation respectively simultaneously, namely the linked list element added is deleted, the linked list element deleted adds, the element of amendment then uses to cancel and recovers the element replacement that steering needle subtracts correspondence in the electronic whiteboard object chained list of a sensing, the electronic whiteboard object data obtained by all contrary operations sends to and is allly connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server, finally will cancel to recover pointer and subtract one.
Further, according to the method that above-mentioned electronic whiteboard the whole network is synchronously cancelled and recovered, wherein: in step S3, if carry out recovery operation, cancel with recovery operation control module in judge to cancel and recover the rear pointer whether steering needle control queue with operation and point to same node point, if identical, be then without efficient recovery order, do not perform any operation; If different, then call to cancel and carry out recovery operation with recovery operation processing module.
Further, when carrying out recovery operation, recover steering needle and point to electronic whiteboard object chained list with cancelling by cancelling and recovers the element that steering needle adds in a sensing electronic whiteboard object chained list and compare one by one, find out respectively to cancel and recover steering needle and add in the electronic whiteboard object chained list of a sensing linked list element adding, delete and revise; All electronic whiteboard object datas found out are sent to and is allly connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server, finally will cancel and recover pointer and add one.
As mentioned above, electronic whiteboard the whole network of the present invention is synchronously cancelled and the system recovered and method thereof, has following beneficial effect:
(1) what complete all electronic whiteboards in whole system by root electronic white board server cancels the data unified control and management with recovery operation, and other sub-electronic white board server carry out cancelling and the uploading and assigning of recovery operation data;
(2) electronic whiteboard client does not need to cancel and recover relevant functional module, only need to cancel and process as general operation with recovery operation, cancelling and recovering data and also process according to general data simultaneously to sending over from electronic white board server of receiving, thus simplify the process of electronic whiteboard client.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of electric whiteboard system of the present invention;
Fig. 2 is shown as the method flow diagram that electronic whiteboard the whole network of the present invention is synchronously cancelled and recovered;
Fig. 3 is shown as operating procedure queue in the present invention and cancels the structural representation recovering steering needle.
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
The structure of electric whiteboard system of the present invention as shown in Figure 1, comprises some electronic white board server and some electronic whiteboard clients.Wherein, according to syndeton, electronic white board server is divided into again root electronic white board server and sub-electronic white board server.Particularly, one or more sub-electronic white board server or electronic whiteboard client is connected under root electronic white board server, connect one or more sub-electronic white board server or electronic whiteboard client under every sub-electronic white board server, thus form multistage tree structure.
Electronic white board server comprises synchrodata processing module, cancels and recovery operation command processing module.Synchrodata processing module comprises data reception module, data transmission blocks and data simultaneous module.Cancel to comprise with recovery operation command processing module and cancel with recovery operation control module and cancel and recovery operation processing module.Electronic whiteboard client comprises operating data sending module, operating data receiving processing module.
Electronic whiteboard client carry out the whole network synchronously cancel with recovery operation time, do synchronously cancelling and recovering in whole system in all electronic whiteboard clients by root electronic white board server, other sub-electronic white board server carry out cancelling and the uploading and assigning of recovery operation data, and electronic whiteboard client does not need to cancel and recover relevant functional module, only need will cancel and regard general operation with recovery operation and process, cancelling and recovering data and also process according to general data simultaneously to sending over from electronic white board server of receiving.
With reference to Fig. 2, electronic whiteboard the whole network of the present invention is synchronously cancelled and the method recovered comprises the following steps:
Step S1: electronic white board server receives the electronic whiteboard data that network sends, and judges the source of these electronic whiteboard data; If from the data of father's electronic white board server, then proceed to step S2; If from the data of electronic whiteboard client or other sub-electronic white board server, then proceed to step S3;
Particularly, electronic white board server receives the electronic whiteboard data that network sends by data reception module, and judge that it is electronic whiteboard client, other sub-electronic white board server of connecting from this electronic white board server, or from the data of father's electronic white board server.
Step S2: the data in this electronic white board server and father's electronic white board server data are consistent, simultaneously by electronic whiteboard data retransmission to being connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server, finally make the data of electronic white board server all in whole electric whiteboard system and all electronic whiteboard clients be consistent.
Particularly, if from the data of father's electronic white board server, then calling data synchronization module makes the data in this electronic white board server be consistent with father's electronic white board server data, calling data sending module is by electronic whiteboard data retransmission to being connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server simultaneously, finally makes the data of all electronic white board server and all electronic whiteboard clients be consistent.
When electronic whiteboard data are from father's electronic white board server, the inevitable father's electronic white board server from its upper level of electronic whiteboard data of this father's electronic white board server.By that analogy, initial electronic whiteboard data are namely from root electronic white board server.When data retransmission goes down by root electronic white board server, the all electronic whiteboard clients be connected under root electronic white board server keep data consistent with root electronic white board server, and all sub-electronic white board server be simultaneously connected under root electronic white board server also keeps data consistent with root electronic white board server; And the sub-electronic white board server under all root of being connected to electronic white board server ensures, all electronic whiteboard clients be connected under book electronic white board server keep data consistent with book electronic white board server with all sub-electronic white board server.The rest may be inferred, just can ensure that the data of all electronic white board server and all electronic whiteboard clients are consistent.
Step S3: parse cancelling and recovery operation order in electronic whiteboard data, and judge whether this electronic white board server is root electronic white board server; If root electronic white board server, then undertaken cancelling and recovery operation process by root electronic white board server; If not root electronic white board server, then will cancel with recovery operation transferring order to father's electronic white board server of this electronic white board server.Father's electronic white board server judges whether this electronic white board server is root electronic white board server again; If root electronic white board server, then undertaken cancelling and recovery operation process by root electronic white board server; If not root electronic white board server, then will cancel with recovery operation transferring order to father's electronic white board server of this electronic white board server.The like, until cancelling in electronic whiteboard data is sent to root electronic white board server with recovery operation order, undertaken cancelling and recovery operation process by root electronic white board server.
Particularly, if from the data of electronic whiteboard client or other sub-electronic white board server, then parse cancelling and recovery operation order wherein, and judge whether this electronic white board server is root electronic white board server.If root electronic white board server, then call to cancel and carry out cancelling and recovery operation process with recovery operation command processing module; If not root electronic white board server, then calling data sending module will be cancelled with recovery operation transferring order to father's electronic white board server of this electronic white board server; And then aforesaid operations is repeated to current parent's electronic whiteboard, be sent to root electronic white board server until will cancel with recovery operation order, finally undertaken cancelling and recovery operation process by root electronic white board server.
Wherein, cancel with recovery operation command processing module in relate to all for cancelling and the data of Recovery processing and related data structures.
In a preferred embodiment of the invention, the data structure of root electronic white board server comprise an operating procedure queue and one cancel recovery steering needle, as shown in Figure 3.The element of this operating procedure queue is an electronic whiteboard object linked list head pointer, each element in electronic whiteboard object chained list is an electronic whiteboard object data, all electronic whiteboard object datas in electronic whiteboard when each electronic whiteboard object chained list comprises current operation.Add, delete and revise electronic whiteboard object encoding each time and carry out the operation of primary electron blank.The tail of the queue of element to operating procedure queue of an operating procedure queue is then added in electronic whiteboard operation each time; An operating procedure queue element (QE) i.e. electronic whiteboard object linked list head pointer of new interpolation, the electronic whiteboard object chained list that this pointed is newly-generated.The element comprised in newly-generated electronic whiteboard object chained list is the element comprised the electronic whiteboard object chained list pointed by the last tail of the queue of operating procedure queue, obtains after carrying out this electronic whiteboard operation.
Root electronic white board server receive one cancel or recovery operation order time, call cancelling and recovery operation control module on it, to cancel or concrete control is carried out in recovery operation order in this module.
If destruction operation order, cancel with recovery operation control module in judge cancel recover steering needle whether point to same node point with the head pointer of operating procedure queue, if identical, be then irritancy order, do not perform any operation; If different, then call and cancel and recovery operation processing module.Cancel with recovery operation processing module in recover electronic whiteboard object chained list that steering needle points to cancelling and recover the element that steering needle subtracts in the electronic whiteboard object chained list of a sensing by cancelling and compare one by one, find out respectively in the electronic whiteboard object chained list of cancelling and recovering steering needle sensing and be added, the linked list element deleted and revise, do contrary operation respectively simultaneously, namely the linked list element added is deleted, the linked list element deleted adds, the element of amendment then uses to cancel and recovers the element replacement that steering needle subtracts correspondence in the electronic whiteboard object chained list of a sensing.The linked list element content of contrary operation is the electronic whiteboard object data needing to cancel.The electronic whiteboard object data that all contrary operations obtain by calling data sending module sends to general electronic whiteboard data format and is allly connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server, finally will cancel to recover pointer and subtract one.
If recovery operation order, cancel with recovery operation control module in judge to cancel and recover the rear pointer whether steering needle control queue with operation and point to same node point, if identical, be then without efficient recovery order, do not perform any operation; If different, then call and cancel and recovery operation processing module.Cancel with recovery operation processing module in recover electronic whiteboard object chained list that steering needle points to cancelling and recover the element that steering needle adds in the electronic whiteboard object chained list of a sensing by cancelling and compare one by one, find out respectively to cancel and recover steering needle and add in the electronic whiteboard object chained list of a sensing and add, delete and the linked list element of amendment, and the linked list element content of the interpolation found out, deletion and amendment is the electronic whiteboard object data needing to recover; All electronic whiteboard object datas found out send to general electronic whiteboard data format and are allly connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server by calling data sending module, electronic whiteboard client carries out reception process by operating data receiver module, sub-electronic white board server carries out reception process by data reception module, finally will cancel recovery pointer and add one.
In sum, electronic whiteboard the whole network of the present invention is synchronously cancelled and the system recovered and method thereof complete all electronic whiteboards in whole system by root electronic white board server cancels the data unified control and management with recovery operation, and other sub-electronic white board server carry out cancelling and the uploading and assigning of recovery operation data; Electronic whiteboard client does not need to cancel and recover relevant functional module, only need to cancel and process as general operation with recovery operation, cancelling and recovering data and also process according to general data simultaneously to sending over from electronic white board server of receiving, thus simplify the process of electronic whiteboard client.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (9)
1. electronic whiteboard the whole network system of synchronously cancelling and recovering, is characterized in that: comprise root electronic white board server, some sub-electronic white board server and some electronic whiteboard clients; Wherein, one or more described sub-electronic white board server or described electronic whiteboard client is connected under described root electronic white board server, connect one or more described sub-electronic white board server or described electronic whiteboard client under each described sub-electronic white board server, thus form multistage tree structure;
Described electronic white board server comprises synchrodata processing module, cancels and recovery operation command processing module; Described synchrodata processing module comprises data reception module, data transmission blocks and data simultaneous module; Described cancel to comprise with recovery operation command processing module cancel with recovery operation control module and cancel and recovery operation processing module; Described electronic whiteboard client comprises operating data sending module, operating data receiving processing module;
Electronic whiteboard client carry out the whole network synchronously cancel with recovery operation time, what complete all electronic whiteboards in whole system by described root electronic white board server cancels the data unified control and management with recovery operation, and other sub-electronic white board server carry out cancelling and the uploading and assigning of recovery operation data; And described electronic whiteboard client only needs to process cancelling as general operation with recovery operation, cancelling and recovering data and also process according to general data simultaneously to sending over from electronic white board server of receiving.
2. electronic whiteboard the whole network according to claim 1 system of synchronously cancelling and recovering, is characterized in that: the data structure of described root electronic white board server comprise an operating procedure queue and one cancel recovery steering needle; The element of described operating procedure queue is an electronic whiteboard object linked list head pointer, each element in electronic whiteboard object chained list is an electronic whiteboard object data, all electronic whiteboard object datas in electronic whiteboard when each electronic whiteboard object chained list comprises current operation.
3. electronic whiteboard the whole network according to claim 2 system of synchronously cancelling and recovering, is characterized in that: add, delete and revise electronic whiteboard object encoding each time and carried out the operation of primary electron blank; The tail of the queue of element to operating procedure queue of an operating procedure queue is then added in electronic whiteboard operation each time; The element comprised in newly-generated electronic whiteboard object chained list is the element comprised the electronic whiteboard object chained list pointed by the last tail of the queue of operating procedure queue, obtains after carrying out this electronic whiteboard operation.
4. electronic whiteboard the whole network as claimed in claim 1 is synchronously cancelled and the cancelling and a restoration methods of the system recovered, it is characterized in that: comprise the following steps:
Step S1: electronic white board server receives the electronic whiteboard data that network sends, and judges the source of these electronic whiteboard data; If from the data of father's electronic white board server, then proceed to step S2; If from the data of electronic whiteboard client or other sub-electronic white board server, then proceed to step S3;
Step S2: the data in this electronic white board server and father's electronic white board server data are consistent, simultaneously by electronic whiteboard data retransmission to being connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server, finally make the data of electronic white board server all in whole electric whiteboard system and all electronic whiteboard clients be consistent;
Step S3: parse cancelling and recovery operation order in electronic whiteboard data, and judge whether this electronic white board server is root electronic white board server;
If root electronic white board server, then undertaken cancelling and recovery operation process by root electronic white board server;
If not root electronic white board server, then will cancel with recovery operation transferring order to father's electronic white board server of this electronic white board server; Then above-mentioned judgement is re-started to described father's electronic white board server, until cancelling in electronic whiteboard data is sent to root electronic white board server with recovery operation order, undertaken cancelling and recovery operation process by root electronic white board server.
5. electronic whiteboard the whole network according to claim 4 method of synchronously cancelling and recovering, is characterized in that: the data structure of described root electronic white board server comprise an operating procedure queue and one cancel recovery steering needle; The element of described operating procedure queue is an electronic whiteboard object linked list head pointer, each element in electronic whiteboard object chained list is an electronic whiteboard object data, all electronic whiteboard object datas in electronic whiteboard when each electronic whiteboard object chained list comprises current operation.
6. electronic whiteboard the whole network according to claim 5 method of synchronously cancelling and recovering, it is characterized in that: in step S3, if carry out destruction operation, then judge whether cancel recovery steering needle points to same node point with the head pointer of operating procedure queue, if identical, be then irritancy order, do not perform any operation; If different, then call to cancel and carry out destruction operation with recovery operation processing module.
7. electronic whiteboard the whole network according to claim 6 method of synchronously cancelling and recovering, it is characterized in that: when carrying out destruction operation, recover electronic whiteboard object chained list that steering needle points to cancelling and recover the element that steering needle subtracts in the electronic whiteboard object chained list of a sensing by cancelling and compare one by one, find out respectively in the electronic whiteboard object chained list of cancelling and recovering steering needle sensing and be added, the linked list element deleted and revise, do contrary operation respectively simultaneously, namely the linked list element added is deleted, the linked list element deleted adds, the element of amendment then uses to cancel and recovers the element replacement that steering needle subtracts correspondence in the electronic whiteboard object chained list of a sensing, the electronic whiteboard object data obtained by all contrary operations sends to and is allly connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server, finally will cancel to recover pointer and subtract one.
8. electronic whiteboard the whole network according to claim 5 method of synchronously cancelling and recovering, it is characterized in that: in step S3, if carry out recovery operation, cancel with recovery operation control module in judge to cancel and recover the rear pointer whether steering needle control queue with operation and point to same node point, if identical, be then without efficient recovery order, do not perform any operation; If different, then call to cancel and carry out recovery operation with recovery operation processing module.
9. electronic whiteboard the whole network according to claim 8 method of synchronously cancelling and recovering, it is characterized in that: when carrying out recovery operation, recover steering needle and point to electronic whiteboard object chained list with cancelling by cancelling and recovers the element that steering needle adds in a sensing electronic whiteboard object chained list and compare one by one, find out respectively to cancel and recover steering needle and add in the electronic whiteboard object chained list of a sensing linked list element adding, delete and revise; All electronic whiteboard object datas found out are sent to and is allly connected to the electronic whiteboard client of this electronic white board server and sub-electronic white board server, finally will cancel and recover pointer and add one.
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| CN201410029698.XA CN104796390B (en) | 2014-01-22 | 2014-01-22 | The system and method that a kind of electronic whiteboard the whole network is synchronously cancelled and recovered |
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| CN201410029698.XA CN104796390B (en) | 2014-01-22 | 2014-01-22 | The system and method that a kind of electronic whiteboard the whole network is synchronously cancelled and recovered |
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