CN103825943A - SCORM standard courseware playing system based on P2P and implementation method thereof - Google Patents
SCORM standard courseware playing system based on P2P and implementation method thereof Download PDFInfo
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Abstract
The invention discloses a SCORM standard courseware playing system based on P2P. The SCORM standard courseware playing system based on the P2P is characterized by comprising a P2P catalog server, a P2P client side and active plugins. The invention further discloses an implementation method of the SCORM standard courseware playing system based on the P2P. According to the method, under the premise that a traditional SCORM courseware video-on-demand learning system overall architecture and a user using mode are not changed, the P2P technology is introduced to solve the problems of high concurrency and large throughput, the problems that users of a traditional enterprise SCORM online courseware learning system increase at high speed, locations are scattered, and hardware investment is large are solved, an existing courseware learning video-on-demand system can meet learning requirements of rapid increasing of online training systems of enterprises, quality of playing of the courseware can be improved, cost input of enterprise training can be lowered, and the SCORM standard courseware playing system based on the P2P and the implementation method thereof can be widely applied to online training systems of other enterprises.
Description
Technical field
The present invention relates to a kind of program request learning system, be specifically related to a kind of SCORM Standard Courseware program request Training and Learning system based on P2P, the invention still further relates to a kind of SCORM Standard Courseware Play System and its implementation based on P2P, the invention belongs to field of computer technology.
Background technology
Online courseware study is one of main business in enterprise's Web-Based Training, traditional courseware major part is take the audio/video multimedia courseware based on SCORM standard as main, existing SCORM courseware VOD mode is issued by streaming media service, when a broadcasting user increases and concurrent some sowing time, system is produced compared with heavy load pressure, and existing streaming media server and the network bandwidth are difficult to support good service performance.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide a kind of SCORM Standard Courseware Play System and its implementation based on P2P.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
SCORM Standard Courseware Play System based on P2P, is characterized in that, comprising: P2P LIST SERVER, P2P client, Active plug-in unit.
The aforesaid SCORM Standard Courseware Play System based on P2P, is characterized in that, described P2P client comprises:
Segment information synchronization module: for segment information being updated to P2P LIST SERVER;
Heartbeat link block: send heartbeat packet to P2P LIST SERVER for timing;
Sectional management module: the size of each segmentation is initial for managing, end position;
Exception management module: for extremely processing that P2P client is received in the time that P2P transmits;
Load balancing module: for carry out load balance process in the time that P2P LIST SERVER selects source;
Described P2P LIST SERVER comprises:
Heartbeat and renewal administration module: for receiving the heartbeat packet of P2P client, upgrade terminal resource and have situation;
Resource request administration module: for receive P2P client request, select source to process and generate seed list;
P2P transport module: for realizing P2P transmission;
Described Active plug-in unit is carried in courseware webpage, is responsible for to P2P client transmission download, webpage closing information.
The implementation method of the aforementioned SCORM Standard Courseware Play System based on P2P, is characterized in that, comprises the steps:
Step 1: user clicks after Video Courseware, webpage Active plug-in unit blocking-up streaming media service access request, and send download request to P2P client, and the return state of the request of waiting for downloads, when return state is successfully time, start P2P service mode, otherwise be streaming media service pattern;
Step 2: P2P client is after plug-in unit request, and local P2P client sends to P2P LIST SERVER the seed file request of downloading, request seed list file;
Step 3: P2P LIST SERVER receives after request, selects seed, generates seed list, sends to request P2P client;
Step 4: local P2P client is selected loading source based on seed list, starts multi-thread concurrent and downloads courseware;
Step 5: P2P client receives after the download application of other P2P clients, accepts applications and starts transmitting procedure, and upgrades P2P LIST SERVER, and the current Thread Count of this terminal adds 1.
The implementation method of the aforementioned SCORM Standard Courseware Play System based on P2P, is characterized in that, described step 1 comprises:
Step 1a: in the time that user clicks Video Courseware, if P2P service does not start, courseware video automatically switches to streaming media service, and this process is transparent to learner;
Step 1b: click after Video Courseware broadcasting user, courseware is also in transmitting procedure, and P2P LIST SERVER is abnormal suddenly, and P2P client detects that P2P LIST SERVER is abnormal, and ejects prompting frame, and then P2P client exits automatically.
The implementation method of the aforementioned SCORM Standard Courseware Play System based on P2P, is characterized in that, the situation that described P2P service does not start comprises: P2P client does not start, and P2P LIST SERVER is abnormal.
The implementation method of the aforementioned SCORM Standard Courseware Play System based on P2P, is characterized in that, described step 3 comprises: according to selecting source policy to select 6 seeds, whole if 6 of less thaies are selected, if be not empty.
The implementation method of the aforementioned SCORM Standard Courseware Play System based on P2P, it is characterized in that, described step 4 comprises: if seed number is more than or equal to 4, in order using front 4 as loading source, if seed number is greater than 1 and be less than 4, in seed list, all seed, all as loading source, if seed list is empty, is directly downloaded to the application of P2P LIST SERVER.
The implementation method of the aforementioned SCORM Standard Courseware Play System based on P2P, is characterized in that, described step 5 comprises: in the time that this P2P client upload Thread Count reaches 4, P2P LIST SERVER will can be using this P2P client as kind of a child node in the time selecting source.
The implementation method of the aforementioned SCORM Standard Courseware Play System based on P2P, is characterized in that, described step 5 comprises:
Step 5a: in the time that P2P client has just started to download, P2P client can directly be downloaded from P2P LIST SERVER; P2P LIST SERVER reaches to be uploaded after the upper limit, if there is the application of P2P client, can not provide download again, can eject prompting frame " P2P LIST SERVER is busy, please refresh courseware webpage and relearn ";
Step 5b: when after the complete segmentation of P2P client downloads, can automatically be updated to P2P LIST SERVER, then have other P2P client to bring in this resource of application download, can the P2P client of complete segmentation go to download this segmentation from; If P2P client upload Thread Count reaches the upper limit 4, P2P LIST SERVER can not select this P2P client to provide upload service for other P2P client;
Step 5c: when the resource seed amount of P2P client application exceedes setting numerical value, P2P LIST SERVER can be selected 6 according to tactful and equilibrating mechanism and send to P2P client to download, and all sends if be less than 6.
The implementation method of the aforementioned SCORM Standard Courseware Play System based on P2P, is characterized in that, described strategy and equilibrating mechanism comprise following three classes:
The first kind: for the user that checks in the network segment of areal, after logging in system by user, system can identify the student which area is use belong to, can provide the P2P client downloads of this area; When P2P client is selected source with this P2P client-access P2P LIST SERVER, only select the user in this area;
Equations of The Second Kind: when P2P LIST SERVER selects source, upload several sequencing selection according to thread;
The 3rd class: when P2P LIST SERVER selects source, according to poor sequencing selection of heartbeat turnaround time.
Usefulness of the present invention is: the present invention is not changing under the prerequisite of traditional SCORM courseware VOD learning system general frame and user's occupation mode, introducing P2P technology has solved high concurrent, the problem of handling up greatly, solve the online courseware learning system of the SCORM of traditional forms of enterprises user rapid growth, region disperses, the problem that hardware has high input, make existing courseware study VOD system can meet the learning demand of enterprise's Web-Based Training rapid growth, improve the quality that courseware is play, reducing corporate training cost drops into, can be widely used in other enterprise's Web-Based Trainings.
Accompanying drawing explanation
Fig. 1 is system operation schematic diagram of the present invention;
Fig. 2 is P2P service of the present invention and streaming media service switching flow figure;
Fig. 3 is P2P transmission basic flow sheet of the present invention;
Fig. 4 is the abnormality processing flow chart of P2P transmission of the present invention;
Fig. 5 is that P2P LIST SERVER of the present invention selects source policy flow chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is done to concrete introduction.
Along with the development of the Internet media communications, this new technique of P2P has changed original centralized content release model from mechanism, is particularly useful for the content sharing application that number of users is larger.For the present situation of the Web-Based Training user of enterprise rapid growth, centralized issue courseware learning content, P2P technology is highly suitable in online learning System, with the bearing capacity of elevator system.Therefore, the object of this research is in the situation that not changing existing network university system architecture and user's occupation mode, propose to improve feasible scheme based on the online courseware learning system of P2P, changed traditional SCORM Standard Courseware program request learning system and be difficult to tackle high problem concurrent, that handle up greatly, the quality, the reduction corporate training cost that make existing courseware study VOD system can meet the learning demand of Su electricity university rapid growth, the broadcasting of raising courseware drop into.
Technical problem to be solved by this invention is:
How to guarantee the compatibility issue of two kinds of mode of operations of system, existing on-line study system is streaming media on demand service mode, if on the original basis, based on a kind of new distributed resource release model of P2P art designs, need to guarantee the mutual switching of whole system aspect two kinds of service modes, mutually supplement;
How Media Player player supports P2P mode of operation problem, under existing system mode of operation, Media Player carries out content delivery as P2P client and media P 2 P LIST SERVER by real time streaming protocol RTP, RTCP and udp protocol, and system adopts " transmission of broadcasting limit, limit " mode to work;
P2P system for content is issued problem of load balancing, problem of load balancing in P2P system refers to how to guarantee in the time of the concurrent broadcasting of multiple system terminals, prevent seed and select hot issue, the advantage of P2P mechanism itself is that the user of same content play is more, the speed that user afterwards downloads is just faster, if but the mechanism not had is avoided its hot issue, its advantage is just difficult to bring into play.
For solving the problems of the technologies described above, the invention provides a kind of SCORM Standard Courseware Play System based on P2P, comprise P2P LIST SERVER, P2P client and Active plug-in unit, it is characterized in that traditional SCORM Standard Courseware VOD system utilizes B/S framework, adopt on the basis of streaming media playing service, the problem of easily blocking up for solving high concurrent, centralized courseware issuing, is not changing under the prerequisite of original system general frame and user's occupation mode, introduces P2P technology and solves.Shown in Fig. 1, this system mainly comprises P2P LIST SERVER and P2P client, Active plug-in unit.
Wherein, P2P client comprises:
Segment information synchronization module: for segment information being updated to P2P LIST SERVER;
Heartbeat link block: send heartbeat packet to P2P LIST SERVER for timing;
Sectional management module: the size of each segmentation is initial for managing, end position;
Exception management module: for extremely processing that P2P client is received in the time that P2P transmits;
Load balancing module: for carry out load balance process in the time that P2P LIST SERVER selects source;
P2P LIST SERVER comprises:
Heartbeat and renewal administration module: for receiving the heartbeat packet of P2P client, upgrade terminal resource and have situation;
Resource request administration module: for receive P2P client request, select source to process and generate seed list;
P2P transport module: for realizing P2P transmission;
Active plug-in unit is carried in courseware webpage, is responsible for to P2P client transmission download, webpage closing information.
As shown in Figure 1, user is in terminal when order video courseware, and IP Information On Demand is notified P2P client by the Active plug-in unit in courseware webpage; P2P client is applied for foradownloaded video Courseware Resource alternately with P2P LIST SERVER again; P2P LIST SERVER receives P2P client-requested, generates seed list, and feeds back to P2P client; P2P client is downloaded according to seed list.Idiographic flow is described and is comprised the steps:
Step 1: user clicks after Video Courseware, first webpage Active plug-in unit blocks streaming media service access request, sends download request to P2P client, and the return state of wait request, when return state is successfully time, start P2P service mode, otherwise be streaming media service pattern;
Step 2: P2P client is after plug-in unit request, and local P2P client sends to P2P LIST SERVER the seed file request of downloading, request seed list file;
Step 3: P2P LIST SERVER receives after request, according to selecting source policy to select 6 seeds (whole if 6 of less thaies are selected, if be not empty), generates seed list, sends to request P2P client;
Step 4: local P2P client is selected loading source based on seed list, starts multi-thread concurrent and downloads courseware.If seed number is more than or equal to 4, if being greater than 1, seed number is less than 4 as loading source using first 4 in order, and in list, all seed, all as loading source, if list is empty, is directly downloaded to the application of P2P LIST SERVER;
Step 5: P2P client receives after the download application of other P2P clients, accepts applications and starts transmitting procedure, and upgrades the current biography Thread Count of this terminal of P2P LIST SERVER and add 1.In the time that this P2P client upload Thread Count reaches 4, P2P LIST SERVER will can be using this P2P client as kind of a child node in the time selecting source.
Furthermore: design at P2P service and streaming media service switchover policy, Fig. 2 has described P2P and served the Strategy Design switching with streaming media service, mainly comprises:
Before starting, P2P service transmission switches: in the time that user clicks Video Courseware, if P2P service does not start, and no matter is that P2P client does not start, or P2P LIST SERVER is abnormal, courseware video council automatically switches to streaming media service, and this process is transparent to learner;
In P2P service transmission, switch: click after Video Courseware broadcasting user, courseware is also in transmitting procedure, P2P LIST SERVER is abnormal suddenly, P2P client can detect that P2P LIST SERVER is abnormal, and eject prompting frame, and " courseware bust this please be closed courseware and reopen; study schedule can not be lost ", then P2P client exits automatically.
In the design of P2P transmission policy, as Fig. 3 has described the elementary tactics flow process that P2P transmits:
While just starting to download, there is no other seed P2P client, P2P client can directly be downloaded from P2P LIST SERVER.P2P LIST SERVER reaches to be uploaded after the upper limit, then has the application of P2P client that P2P client downloads can be provided, and can eject prompting frame " P2P LIST SERVER is busy, please refresh courseware webpage and relearn ".
When after the complete segmentation of P2P client downloads, can automatically be updated to P2P LIST SERVER, then have other P2P client to bring in this resource of application download, can from, the P2P client of complete segmentation go to download this segmentation.If P2P client upload Thread Count reaches the upper limit 4, P2P LIST SERVER can not select this P2P client to provide upload service for other P2P client.
Set numerical value (can manually set, such as 10) when the resource seed amount of P2P client application exceedes, P2P LIST SERVER can be selected 6 according to certain strategy and equilibrating mechanism and send to P2P client to download, and all sends if be less than 6.
Fig. 4 has described the abnormal strategic process of P2P transmission, after the download of P2P client application section resource, if connect wherein certain seed P2P client failure, again apply for to P2P LIST SERVER, upgrade seed list, select a new P2P client to continue failed thread and download.So, still can not connect download after repeating 2 times, not reattempt other user of application and continued download as source, download but directly turn to P2P LIST SERVER to complete this thread.
Select in source policy & equilibrium treatment mechanism in P2P service,
P2P LIST SERVER, in the time selecting source, selects applicable seed to generate seed list according to the priority orders of following strategy, and sends to the P2P client of request.As shown in Figure 5:
One, in the network segment of areal, check user: after logging in system by user, system can identify the student which area is use belong to, the P2P client downloads of this area can be provided.When P2P client is selected source with this P2P client-access P2P LIST SERVER, only can select the user in this area;
Two, upload several sequencing selection according to thread: the timing of P2P client sends a heartbeat to P2P LIST SERVER and connects bag, in bag, attach some and upload the information such as thread, heartbeat turnaround time stamp, P2P LIST SERVER can record these information and can use these data in the time selecting source.In order to keep current state to upgrade, the time of heartbeat packet be set as 1 minute more reasonable.P2P client can send heartbeat packet to P2P LIST SERVER, upgrades the real-time Thread Count of uploading, burst information etc.When P2P LIST SERVER selects source, also can sort according to user's the Thread Count of uploading, preferential select to upload P2P client that thread is few as source, so both can guarantee the quality in source, also can accomplish load balancing;
Three, according to poor sequencing selection of heartbeat turnaround time: the heartbeat packet that P2P client sends, can calculate a time difference back and forth, this time difference can be reflected the problem of the certain network bandwidth and machine performance.When P2P LIST SERVER selects source, according to time extent sequence, the preferential poor little client computer of select time is as source.
The present invention is not changing under the prerequisite of traditional SCORM courseware VOD learning system general frame and user's occupation mode, introduce P2P technology and solved high problem concurrent, that handle up greatly, solve the problem that the online courseware learning system of the SCORM of traditional forms of enterprises user rapid growth, region dispersion, hardware have high input, make existing courseware study VOD system can meet the learning demand of enterprise's Web-Based Training rapid growth, improve quality, reduction corporate training cost input that courseware is play, can be widely used in other enterprise's Web-Based Trainings.
More than show and described basic principle of the present invention, principal character and advantage.The technical staff of the industry should understand, and above-described embodiment does not limit the present invention in any form, and all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all drops in protection scope of the present invention.
Claims (10)
1. the SCORM Standard Courseware Play System based on P2P, is characterized in that, comprising: P2P LIST SERVER, P2P client, Active plug-in unit.
2. the SCORM Standard Courseware Play System based on P2P according to claim 1, is characterized in that, described P2P client comprises:
Segment information synchronization module: for segment information being updated to P2P LIST SERVER;
Heartbeat link block: send heartbeat packet to P2P LIST SERVER for timing;
Sectional management module: the size of each segmentation is initial for managing, end position;
Exception management module: for extremely processing that P2P client is received in the time that P2P transmits;
Load balancing module: for carry out load balance process in the time that P2P LIST SERVER selects source;
Described P2P LIST SERVER comprises:
Heartbeat and renewal administration module: for receiving the heartbeat packet of P2P client, upgrade terminal resource and have situation;
Resource request administration module: for receive P2P client request, select source to process and generate seed list;
P2P transport module: for realizing P2P transmission;
Described Active plug-in unit is carried in courseware webpage, is responsible for to P2P client transmission download, webpage closing information.
3. the implementation method of the SCORM Standard Courseware Play System based on P2P described in claim 1, is characterized in that, comprises the steps:
Step 1: user clicks after Video Courseware, webpage Active plug-in unit blocking-up streaming media service access request, and send download request to P2P client, and the return state of the request of waiting for downloads, when return state is successfully time, start P2P service mode, otherwise be streaming media service pattern;
Step 2: P2P client is after plug-in unit request, and local P2P client sends to P2P LIST SERVER the seed file request of downloading, request seed list file;
Step 3: P2P LIST SERVER receives after request, selects seed, generates seed list, sends to request P2P client;
Step 4: local P2P client is selected loading source based on seed list, starts multi-thread concurrent and downloads courseware;
Step 5: P2P client receives after the download application of other P2P clients, accepts applications and starts transmitting procedure, and upgrades P2P LIST SERVER, and the current Thread Count of this terminal adds 1.
4. the implementation method of the SCORM Standard Courseware Play System based on P2P according to claim 3, is characterized in that, described step 1 comprises:
Step 1a: in the time that user clicks Video Courseware, if P2P service does not start, courseware video automatically switches to streaming media service, and this process is transparent to learner;
Step 1b: click after Video Courseware broadcasting user, courseware is also in transmitting procedure, and P2P LIST SERVER is abnormal suddenly, and P2P client detects that P2P LIST SERVER is abnormal, and ejects prompting frame, and then P2P client exits automatically.
5. the implementation method of the SCORM Standard Courseware Play System based on P2P according to claim 4, is characterized in that, the situation that described P2P service does not start comprises: P2P client does not start, and P2P LIST SERVER is abnormal.
6. the implementation method of the SCORM Standard Courseware Play System based on P2P according to claim 5, is characterized in that, described step 3 comprises: according to selecting source policy to select 6 seeds, if 6 of less thaies select all, if be sky.
7. the implementation method of the SCORM Standard Courseware Play System based on P2P according to claim 6, it is characterized in that, described step 4 comprises: if seed number is more than or equal to 4, in order using front 4 as loading source, if seed number is greater than 1 and be less than 4, in seed list, all seed, all as loading source, if seed list is empty, is directly downloaded to the application of P2P LIST SERVER.
8. the implementation method of the SCORM Standard Courseware Play System based on P2P according to claim 7, it is characterized in that, described step 5 comprises: in the time that this P2P client upload Thread Count reaches 4, P2P LIST SERVER will can be using this P2P client as kind of a child node in the time selecting source.
9. the implementation method of the SCORM Standard Courseware Play System based on P2P according to claim 8, is characterized in that, described step 5 comprises:
Step 5a: in the time that P2P client has just started to download, P2P client can directly be downloaded from P2P LIST SERVER; P2P LIST SERVER reaches to be uploaded after the upper limit, if there is the application of P2P client, can not provide download again, can eject prompting frame " P2P LIST SERVER is busy, please refresh courseware webpage and relearn ";
Step 5b: when after the complete segmentation of P2P client downloads, can automatically be updated to P2P LIST SERVER, then have other P2P client to bring in this resource of application download, can the P2P client of complete segmentation go to download this segmentation from; If P2P client upload Thread Count reaches the upper limit 4, P2P LIST SERVER can not select this P2P client to provide upload service for other P2P client;
Step 5c: when the resource seed amount of P2P client application exceedes setting numerical value, P2P LIST SERVER can be selected 6 according to tactful and equilibrating mechanism and send to P2P client to download, and all sends if be less than 6.
10. the implementation method of the SCORM Standard Courseware Play System based on P2P according to claim 9, is characterized in that, described strategy and equilibrating mechanism comprise following three classes:
The first kind: for the user that checks in the network segment of areal, after logging in system by user, system can identify the student which area is use belong to, can provide the P2P client downloads of this area; When P2P client is selected source with this P2P client-access P2P LIST SERVER, only select the user in this area;
Equations of The Second Kind: when P2P LIST SERVER selects source, upload several sequencing selection according to thread;
The 3rd class: when P2P LIST SERVER selects source, according to poor sequencing selection of heartbeat turnaround time.
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| CN103825943B (en) | 2017-03-29 |
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