CN101013986A - Method for realizing data inquiring system of sensor network based on middleware of mobile agent - Google Patents
Method for realizing data inquiring system of sensor network based on middleware of mobile agent Download PDFInfo
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Abstract
The invention relates to one sensor network data inquire process method based on mobile agent middle part, which comprises the following steps: regarding whole wireless sensor as one database; realizing on mobile agent middle part; executing user inquire task by mobile agent onto designed point to start operations till fulfilling inquire task to end its life circle or according to its task need onto other point; inquiring process system design to realize network base station to change inquire agent design.
Description
Technical field
The present invention is used for the design of the data query system of wireless sensor network.Mainly solve problems such as low and application cycle of inquiry issue, data collection and storage, search efficiency in the wireless sensor network is long, belong to the crossing domain of wireless sensor network and database technology.
Background technology
Sensor network is by being distributed in the network that microsensor node different geographic regions, that have the wireless broadcast communication ability is formed in a large number.Each sensor node all has the ability of measurement, storage and deal with data, and can communicate with other node within certain wireless range.The application that sensor network can be supported observes the building monitoring from biological habitat, to household automation control, and to the management of production and supply chain, or the like, relate to production, life, scientific research and consumption every field.
Sensor network is a kind of data-centered network, and its core is a perception data.The continuous information that the interested especially sensor network often of user obtains flows or the periodic statistics of certain physics phenomenon is reported, rather than transducer itself or its implementation procedure.By using wireless sensor network query process software system, the user can send the query requests of true-to-shape to wireless network, system with realize obtaining with detecting sensor network surrounding environment in physical data, for example: in the environmental monitoring application system, can inquire about data such as the temperature that perceives on the network node in the appointed area, air pressure, light intensity.
In order to realize the data query system of above-mentioned functions, and satisfying specific implementation again to the characteristic of user transparent, the system expandability, the system easily low coupling between deployment property, the system module, the high cohesion characteristic in the module, these realize it being very difficult on the very limited embedded type sensor node of resource.This be because: at first sensor node usually has very limited energy resource, storage resources and computational resource, and this is that size of node is mostly in cms magnitude even following by the small decision of volume of node; Secondly, the wireless communication link line state of sensor network is very unstable, and the noise jamming in the wireless channel is big, and data loss rate is higher, causes network data to have more mistake and lose; In addition, sensor node is a kind of Embedded hardware system, developing a new sensor network application system often needs to fire program again for all nodes in the network, this is for the sensor network of a large scale deployment, especially being deployed in the network that is difficult among the human approaching environment, is the thing that bothers very much.Therefore, realize that in sensor network effectively calculating, data query processing that is effectively energy-conservation, flexibility and changeability are challenging research topics.
Wireless sensor network data query is handled and generally can be divided into two steps: (1) is published to inquiry in the specified target area of inquiry and goes; (2) collect and process information from data source nodes.The main query processing scheme that has proposed at present can be divided into following three types:
(1) user uses the query statement of definition, to inquire about broadcast transmission and go on all nodes in the network, all nodes are all carried out inquiry and Query Result are sent back to the user, carry out certain Data Fusion in the process of loopback, thereby the minimizing data traffic alleviates the load of network;
(2) adopt particular way by inquiry is sent to the appointed area, the appointed area is by query contents decision, only carries out query task on the node in this zone, and with Query Result along the loopback that makes progress of the routing tree of appointment, up to arriving the network management base station, in the loopback process, be optimized processing;
(3) adopt interest information to describe inquiry, an interest is at first delivered to gateway node, and is delivered in the whole sensor network by one with jumping and goes.A node that lacks the match interest data can be transmitted the neighbor node of interest to it.Which position decision is forwarded to interest information and then is based on clue that data itself provide and specific routing mechanism, and node broadcasts sowing the data of match interest along interest opposite direction is transmitted back to the network management base station---and this is the solution that a kind of query processing and routing mechanism are combined closely;
Adopt first kind of scheme to mean and will the grammer of query requests be limited, this being limited with is beneficial to the optimization process that realizes various inquiry operators on node, help the fusion treatment in the data loopback process, but also limited the range of application of this inquiry system; Adopt second kind of scheme to dwindle the coverage of inquiry, alleviated the amount of calculation of whole network, but because inquiry is limited in the problem of the unpredictable node failure of specified node, the execution underaction of query task; Adopt the third scheme less for the restriction of inquiry form, and the routing mechanism that has adopted data-centered inquiry and route to combine, the issue of inquiry, result's loopback all have flexibility, but this design is unfavorable for the relative independentability of enquiry module and routing policy, having limited the variation of routing policy selects, make that the construction cycle of system is longer, and autgmentability is not strong yet; In addition, handle, need the application developer specifically to specify the code of optimization process, thereby also increased the query processing development difficulty though this scheme also can realize netting interior query optimization.
The query processing solution based on the mobile agent middleware that adopts among the present invention combines the advantage of first kind of scheme and second kind of scheme, it is relatively independent that enquiry module and route are handled, the with clearly defined objective of inquiry issue (is not broadcast transmission, get on but send to limited, node associated with the query), and can according to the situation of the needs of query task or node energy dynamically the migration query task to new destination node, go, make system have stronger robustness and adaptability; And can be according to the design of user's request flexible Application system in the modification of system and escalation process, as: the data structure and the display format that change query requests form and Query Result.
The mobile agent middleware Technology is a kind of emerging technology that occurs along with the development of Internet, and it can simplify design, realization and the maintenance of distributed system effectively.Mobile agent is meant an independently software entity, and it is according to certain rules, can be autonomous on the network of isomery, move, representative of consumer is finished specific task.The advantage of mobile agent middleware mainly contains 2 points: on the one hand, it has realized independently drawing close to calculating resource requirement, and this can save the bandwidth of network and have asynchronous feature; On the other hand, permission program dynamically is published to main frame.Because the plurality of advantages of mobile agent middleware, it is in the wireless sensor network of main hardware resource that now existing researcher is applied to mobile proxy technology with the embedded device, the application program that helps dynamic develop and field sensor network, and can be by the distributed treatment of the realization of the cooperation between agency calculating, alleviate the heavier problem that causes premature failure of individual nodes load, and help the quick exploitation of application program;
The mobile agent middleware is handled as the data query of platform base exploitation wireless sensor network, can realize efficient, energy-conservation Distributed Query Processing function, by agency's migration query processing task being sent to concrete node associated with the query gets on, on limited source node, carry out query task and obtain Query Result, again the result being delivered to terminal gathers, because Query Result is generally much smaller than original data volume, therefore can reduce the transmission power consumption of network greatly, thereby save the integral energy of network; In addition, owing to query task is encapsulated in the Agent, thus can on the network management base station, come the content of flexible change task by the design that changes inquiry proxy, thus realize developing fast new query processing application system.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of sensor network data query system implementation method based on the mobile agent middleware, this method is used to solve that the network energy-saving that the current wireless sensor network data query handles is poor, search efficiency is not high, network-adaptive is poor, the construction cycle is long and dispose problems such as dumb.The invention provides wireless sensor network data query system, and improved efficiency of query and energy saving, reduce the develop and field cost that wireless sensor network data query is handled application system with broad field of application.
Technical scheme: the present invention is a kind of application system development method, can design realization on existing wireless sensor networks mobile agent middleware platform software.The present invention is by being abstracted into large database with wireless sensor network, and utilizes the agency mechanism of mobile agent middleware, realized a kind of data query system that can develop fast.Its design object is: the mobile agent that can carry out query task by structure, utilize the autonomous migration of mobile agent and the cooperation between the agency then, be implemented in position associated with the query and finish the query processing task of system's appointment, reduced the blindness of query processing; Also realize distributed treatment flexibly by the cooperation between the agency, improved the efficient of inquiry, the integral energy resource of having saved wireless sensor network; Allow query processing task dynamically to be published to the network node execution of getting on, be convenient to the deployment of application program, also make application to change flexibly according to user's demand.
A kind of sensor network data query system that the present invention realizes has following feature: realize on existing mobile agent middleware basis; Sensor network integral body is considered as a database, mobile agent produces according to the query requests content that the user sends, the agency is moved to bring into operation on the specified node and is finished until query task, then or finish life or move to other node according to the task needs to get on to continue to carry out; Query processing system is deployed on the network management base station rather than on the network node, can dynamically changes the function of system according to user's needs, and all nodes that the program code that does not need to change downloads in the network get on.
The present invention based on wireless sensor networks mobile agent middleware and system for sensor network operating combine all the sensors node that is deployed in the large-scale wireless sensor network and get on, the query processing application program of developing on this basis can dynamically send to by the form that sends the agency in the optional position in the network and go.The basic function mechanism of this mobile agent middleware is: the Agent according to appointment generates the mobile agent independent subject, and it is got on along the node that a certain routing policy (by the selected routing policy of middleware platform) sends to appointment, on this node by mobile agent virtual machine operation until end, and can be in acting on behalf of implementation according to Agent instruction move on other node and move.The agency is a software entity with independent computational resource and independent memory space.Can exchange by the tuple space on the access node between a plurality of mobile agents, tuple space is the metadata cache space of reserving on the node, what store is a plurality of tuple information, a tuple information is made up of tuple identification number and a plurality of information field, and the content of each information field is specified by the main body of acting on behalf of that produces tuple.Therefore, the agency can realize storage by inserting tuple to tuple space, again can be by the visit of tuple space being inquired about the data message that is stored in tuple space.Agency on other node also can visit the tuple space on the local node, thereby realizes the long-range interchange between the agency.
The Agent command system is different according to the design of mobile agent middleware platform, but the instruction of most of Agent all can be divided into following 6 types according to function:
1. computing class (comprising arithmetic, logical operation),
2. variable access class (the interim storage and the extraction of variable),
3. node state is adjusted class states such as () node is set are dormancy, perception, bright lamp, pipe,
4. tuple space access classes (tuple of local and remote tuple space is realized depositing, withdrawing operation),
5. the network information is obtained class (node locating, neighbor information are obtained, neighbours judge, link information calculate),
6. agency migration class (be divided into the agency removes and the agency duplicates migration two class migration patterns),
Based on the general frame of the sensor network data query system of mobile agent middleware as shown in Figure 1, the implementation method of this system has three key points in design: represent the design of the Agent of query task, query requests to the conversion and the network management base station of Agent the reception of Query Result to be handled.
According to this method for designing, query processing task is divided into two kinds of historical query and immediate inquirings according to the difference in query aim period.For immediate inquiring, query processing task produces on the network management base station with agency's form, and be sent to the inquiry appointment network node on carry out, utilize the tuple remote operation that Query Result is sent back the network management base station from network node then, carry out last processing in the network management base station and the operation of storage data in historical data base; All query processings on the network node are finished by the agency, therefore the change of inquiry processing method does not relate to the machine code content on the node, therefore the query processing application system can change flexibly according to the variation of user's request, and does not need to redeploy the program on network and the network node.For historical query, inquiry to as if be stored in data in the historical data base, the key of design is the design of tableau format in the database.
Architecture:
Fig. 1 has provided the architecture of designing by the inventive method based on the wireless sensor network data query treatment system of mobile agent middleware, and this architecture has: inquiry proxy generation module, inquiry proxy transferring module, Query Result receive to be handled and four processing modules of historical data processing module and historical query interface and two kinds of user inquiring interfaces of immediate inquiring interface.These modules and interface are coordinated control by the unification of query processing system main control module.
Provide specifying of these four modules below:
The inquiry proxy generation module: the immediate inquiring required parameter information according to user's input is determined the task that the inquiry proxy needs are carried out, determine agency's code content, agency's state conversion process and the cooperation relation between the agency according to the query task content, finally generate a plurality of inquiry proxy main bodys (back is called inquiry " agent ").
Inquiry proxy sends transferring module: the insertion mechanism of acting on behalf of of calling the mobile agent middleware, the inquiry " agent " that generates sent in the wireless sensor network go, and in wireless sensor network, net interior migration according to the routing policy of mobile agent middleware appointment.This Module Design depends on the mobile agent mechanism of mobile agent middleware.
The Query Result receiving processing module: the network management base station utilizes communication port and communication line, receives the immediate inquiring result data bag that returns from wireless sensor network by network gateway node.Need design network communication of wireless sensor interface, realize monitoring the packet that network returns; In packet, extract needed immediate inquiring result (result at this moment adopts the form of tuple to represent), and the result is carried out integrated treatment and returns to the user by user interface;
Historical data base access process module: the data that each immediate inquiring is obtained are saved in the database (being called historical data base) of network management base station, and realization is to the query manipulation (being called historical query) of historical data base, historical query not only helps once query manipulation is carried out record, the more important thing is the perception data in a certain period period of history is preserved so that later inquiry.
Method flow:
Based on the development approach of the sensor network data query system of mobile agent middleware, the step of this development approach is: (referring to accompanying drawing 5)
Step 1). carry out demand analysis, determine the form and the parameter of the query requests that the user will import, the form and the structure of the result data that returns with inquiry determine that the user is to the requirement of ageing, the accuracy of query processing and to the requirement of Query Result representation;
Step 2). according to the time range of query requests and effective the requirement query requests is divided into two types of historical query and immediate inquirings, respectively to pending;
Step 3). step 1) is analyzed the selection of target area that the user's immediate inquiring request analysis that obtains becomes query task, data field scope, time domain scope, polling cycle, query manipulation and merged operator;
Step 4). according to the detailed functions of step 3) analysis and consult task, and write the query function specification;
Step 5). according to the collaboration diagram between the program flow diagram of query function specification design inquiry proxy, state transition diagram, the mobile agent with act on behalf of migration strategy;
Step 6). according to step 5) and according to mobile agent middleware instruction syntax, design comprises " inquiry proxy " Code Template of query manipulation parameter;
Step 7). the conversion processing flow chart according to step 3) and step 6) design from the query requests parameter to " inquiry proxy " code;
Step 8). the flow chart according to step 7) is write the program code of " conversion processing module ", and writes the driver and the stubs of " conversion processing module ", and " conversion processing module " tested;
Step 9). the flow chart of the generation processing module of design from " inquiry proxy code " to " inquiry proxy main body ", and programming realizes;
Step 10). " network insert handle " module of design " inquiry proxy " main body, " inquiry proxy " intelligent agent that insertion mechanism will generate of acting on behalf of of promptly calling the mobile agent middleware sends in wireless sensor network; Coding is realized " network insertion processing module " and is carried out module testing then;
Step 11). the sensor network interface module of the network abstraction interface of mobile agent middleware is called in design, is mainly used in the network management base station is mail in monitoring from sensor network message bag;
Step 12). data structures such as the tuple of planned network management of base station and tuple space are used for access and monitor the Query Result data acquire from the sensor network interface module, the data query structural design be with node on the tuple space data structure unified structure form of mobile agent middleware;
Step 13). the data access according to tuple space on the node is handled, and the data access processing module of operation is stored and extracted to design and realization to network management base station tuple space, is used for the Query Result that buffer memory and inquiry receive;
Step 14). be designed for the tuple template of in tuple space, searching the Query Result tuple, the data structure of tuple template is with reference to the tuple data structural design that designs in the step 12), and contained range information is according to step 2 in the template) in the user inquiring parameter design;
Step 15). design and programming realize the Query Result receiving processing module, and this module mainly utilizes tuple template and tuple space query manipulation to realize being stored in the inquiry that receives Query Result in the tuple space;
Step 16). all modules of integrated step 8), step 9), step 10), step 11) and step 15) form whole immediate inquiring processing module;
Step 17). according to immediate inquiring result's data format and historical query parameter, the enquiry of historical data storehouse of design stores historical query operation note and historical query data, and write the operation code that fulfillment database connects;
Step 18). design realizes historical data is carried out the module of database storage operation, realizes the preservation of historical query record and data query;
Step 19). design realizes historical data is carried out the module of database query operations, realizes the inquiry to historical query record and data query;
Step 20). integrated step 17) database and step 18) and step 19) module, form whole historical query processing module;
Step 21). according to step 2) and the analysis result of step 3), design and programming realize the user inquiring interface of query requests, the form of user inquiring interface can be graphical user interface, command line interface or application programming interfaces;
Step 22). design and programming realize that the Query Result of immediate inquiring and two kinds of inquiries of historical query returns interface, and interface shape can be graphical user interface, command line interface or application programming interfaces;
Step 23). integrated step 16), step 20), step 21) and step 22) all processing modules and user interface form whole sensor network data query system.
Beneficial effect: the inventive method has proposed a kind of new types of data inquiry system of wireless sensor network, and has proposed to develop the implementation method of this inquiry system based on mobile agent.The mobile agent mechanism that the present invention has used mobile agent middleware software platform to provide, and adopted the abstract technology of " wireless sensor network is a database ".The query processing system that the inventive method is designed has the following remarkable advantage, is that at present other wireless sensor network query is handled the designed inquiry system that goes out of development approach and do not possessed or be not so good as:
(1) improved the develop and field efficient of query processing application system: the inventive method has utilized mobile agent middleware platform support application program dynamically to be published to the characteristics of main frame (sensor network nodes), realize only on network management base station static state, the resource abundance, carrying out the wireless sensor network query processing application system of develop and field, and provided the structure of this system and detailed development process.Owing to avoided compiling and fire the process of embedded machine code continually for all the sensors node, thereby improved the develop and field efficient of system greatly, reduced the difficulty and the expense of system development and deployment.In addition, because the inventive method with the design of query processing system and the design of protocol independence of network route, has therefore reduced the complexity of exploitation.
(2) improved the search efficiency of wireless sensor network query treatment system: utilize mobile agent mechanism by mobile agent on behalf of carrying out query task, network inquiry task to complexity realizes the Distributed Calculation processing, because the agency can be moved on other nodes flexibly with the needs that query task is carried out, therefore the agency is published on the limited destination node and expands again as required then, help reducing the blindness of inquiry like this, thereby reduced query time, improved the efficient of inquiry.
(3) query processing system has lower network power consumption property: because the query processing system of the inventive method has been realized inquiry and the distributed treatment of calculating by the mutual cooperation between the agency, thereby alleviated because the individual nodes overload causes the problem of too early actual effect.On the other hand, because the query processing system of this method is optimized processing to data query by the agency and calculates on node, result after will optimizing then is sent to the base station, because the result after optimizing is more much smaller than the data volume of initial data, therefore can reduce the transmission power consumption of network ground widely, thereby increase the life cycle of sensor network.
(4) can satisfy widely application demand and flexibly application extension require: present various wireless sensor network query treatment systems not only the construction cycle longer, and can not make amendment and expand according to user's needs.The inventive method can change the design of system flexibly according to user's request, or old system expanded, upgrades, this is because the design of the inventive method does not have the function of strict limits application, and new system can be deployed on the network management base station very easily, therefore satisfy query processing system application demand widely, improved the easy autgmentability of system.
Description of drawings
Fig. 1 is based on the sensor network data query system software structure figure of mobile agent middleware.Represent the level that calls between software module from bottom to top.
Fig. 2 is the 26S Proteasome Structure and Function schematic diagram that operates in the inquiry proxy (inquiry " Agent ") on sensor node hardware and the mobile agent middleware in the wireless sensor network.
Fig. 3 is based on the software arrangement schematic diagram of the sensor network data query system of mobile agent middleware.Dotted line is the hardware infrastructure of system with the lower part, and dotted line is the basis of software facility of system with top.In the frame of broken lines is the composition structure of this query processing system.
Fig. 4 be in the embodiment (5) design operate in inquiry " agent " program structure diagram on the query aim node
Fig. 5 is based on the step key diagram of development approach of the sensor network data query system of mobile agent middleware.By having represented the step process of developing from top to bottom and from left and right order.
Embodiment
Development process based on the sensor network data query system of mobile agent middleware is specific as follows:
Step 1: carry out demand analysis and determine user interface parameters and query task definition.
At first, according to the expression form of clear and definite inquiry mode of user's needs and query requests, thus the query argument of definite system.The mode of inquiry can be the graphical user interface form, also can be command line mode, can also be routine interface form (generally being used for the design of middleware or platform software).The expression form of inquiry can design according to the mode of inquiry and user's demand, and relatively Chang Yong inquiry expression form is the query statement of class data base query language (as the SQL query language) form, also can select with the mode of graphical selection.The query argument of system is used to specify the type of inquiry and the content of query task, for example can be the combination of following several parameters: the community set of the time range of inquiry, the regional extent of inquiry, inquiry, the operation function of Query Result, the periodicity of inquiry.Also will determine the parameter that the accuracy about the ageing of inquiry and inquiry requires in query argument, inquiry is divided into two kinds of immediate inquiring (to the inquiry of current network or the network data in following a period of time) and historical querys (query manipulation of once handling in over and done with a period of time and the network data that inquires are inquired about) according to the ageing difference of inquiry.The query task of immediate inquiring is finally moved to by inquiry " Agent " (inquiry mobile agent) and is gone in the network to carry out, and the task of historical query is handled by independently historical query processing module.
Secondly, determine that Query Result turns back to the user representing mode.After Query Result turns back to the network management base station with the form of tuple, produce the result data of user's desired form through system handles.Similar with the user inquiring request, result data can be designed to the display mode of graphic user interface, also can be command line mode, can also be routine interface parametric form (middleware or platform software system adopt), and selected a kind of user result returns form according to user's request.
Once more, provide the clearly definition of query task according to query argument.Query task is the functional description of query processing system, mainly determine content, for example: determine that according to parameters such as the community set of inquiry, the periodicity of inquiry the perception task definition of inquiry is the value of at set intervals certain some attribute being carried out a sense operation and returning them according to query argument.
Step 2: the conversion process module of design from the immediate inquiring parameter to inquiry " Agent ".Because finally being moved to by inquiry " Agent " (inquiry mobile agent), the query task of immediate inquiring goes in the network to carry out, so, the immediate inquiring parameter must be converted to inquiry " Agent " for immediate inquiring.
At first, the process template of design inquiry " Agent ".According to the class figure of the design inquiry of the query task function in the step 1 " Agent " and the collaboration diagram between the agency, design program structure, state transition graph and the mobile agent migration strategy of inquiry " Agent " more earlier; Adopt the Agent language design of mobile agent middleware platform appointment to be with the process template of the inquiry " Agent " of parameter again;
Once more, the generation module of design inquiry " Agent ".The structure of inquiry " Agent " main body as shown in Figure 2, the main body of inquiry " Agent " mainly comprises code block, active stack, heap space and the several structures of reaction formation, utilizes the mobile agent middleware platform to provide the virtual machine function to arrange and carry out inquiry " Agent "; At last for the user inquiring interface with act on behalf of parameter passing interface between generation module.
At last, generation module and the query argument transmission that will inquire about " Agent " are module integrated, form the conversion processing module from the immediate inquiring parameter to inquiry " Agent ".
Step 3: design receiving processing module to the Query Result that from wireless sensor network, sends.Native system is put into tuple with Query Result, utilize " long-range insertion tuple " operation of mobile agent that Query Result is sent back the base station, but be to show when Query Result is back to the user, therefore need design the Return Reception Dept. branch according to the user's request in the step 1 with the form of application system specific requirement.
At first, tuple space and realization tuple space on the planned network management of base station to operate.Tuple is the memory cell that is made of a plurality of attributes and corresponding property value.Tuple space is made up of the tuple of limited number, be fit to deposit the object information that inquiry obtains from database table, according to network is the thought of database, unlimited sensor network integral body is seen as a big database, and the data on the node all adopt the storage of tuple form, so tuple space also is fit to the storage data that inquiry obtains from wireless sensor network.In general, mobile agent middleware platform itself also provides tuple space and tuple space operation, for example: sensor network middleware Agilla (development of Washington, DC university).Also can new tuple space and the tuple space operation of independent design.
Secondly, want the form of expression of specified data in tuple and put in order (this part the inquiry " Agent " in the realization, because tuple is produced by inquiry " Agent "), to return results be divided into a plurality of tuples according to the maximum length of tuple in addition and return;
Once more, the tuple of planned network management of base station part is monitored the processing section.Method is to utilize the network monitoring module of mobile agent middleware platform and interface to realize monitoring sensor network, and intercepting comprises the message of tuple then, resolves the message bag and obtains the tuple space that tuple as a result is inserted into the base station.
Then, the cyclic query thread of design tuple space.Method is according to the tuple template of query contents design element group polling (being used for the matched and searched tuple), and the query manipulation inquiry of calling tuple space in the circulation thread can be mated the tuple of tuple template, and programming realizes this thread.
At last, calculate and the conversion Query Result, and provide user result to return interface.From the tuple that matches, extract nonredundant Query Result data, and carry out last selection and aggregation operator.According to user's request, the user who designs particular form is interface as a result.
Step 4: design immediate inquiring " Agent " is inserted into the program module in the sensor network, mainly calls the insertion mechanism of acting on behalf of of mobile agent middleware platform.At first, to determine the insertion position (which node that promptly is inserted into sensor network gets on) of inquiry " Agent " according to query task, secondly, design will be inquired about the module of the query statement that " Agent " be compiled into a rule mobile agent middleware platform appointment (the mobile agent middleware platform has a command system set), and programming realizes; Call acting on behalf of insert module and will inquiring about the assigned address that " Agent " send in the network and get on of mobile agent middleware platform then.
Step 5: history design query processing module and historical data base.Historical query is the inquiry that is used to realize the network data (being the environment of network) to the past period.
At first, because the data result of immediate inquiring is the main contents of historical data library storage, so should be according to the data result of immediate inquiring and the customer parameter history design database of historical query, Database Systems adopt the relational Database Design method to begin design from design E-R model, main form is Query Result data form and query task form, is respectively applied for enquiry of historical data and historical query record.
Secondly, history design query processing module.According to historical query parameter designing query sentence of database.Consider at user option all query argument scopes, the number of parameters of permission, the design alternative actual parameter also changes into the processing module of query statement.For example: the date range of inquiry is date1 to date2, the range of attributes of inquiry is: attr1 and attr2, the target area scope of inquiry is that the address is at matrix [(x1, y1), (x2, y2)] Nei node, inquiry have two operators: division operation: group (attr2) (promptly dividing into groups) and aggregation operator: avr (attr1) (being averaging) according to the difference of attr2 then query statement can be designed as:
select?average(attr1)，attr2
where?x1＜locs.x?and?locs.x＜x2?and?y1＜locs.y?and?locs.y＜y2
group?by?attr2
from?history_datasheet
Then, design utilizes query statement to carry out the database access operation, finishes the query task to historical data base.Can utilize the database access control interface of high-level language, as: the JDBC of java.
At last, will return to the user with the form that the user needs from the data that data base querying returns.The form of specifically returning designs according to the demand analysis in the step 1.
Step 6: dispose sensor network data query system based on the mobile agent middleware.As shown in Figure 3, with one typically based on the sensor network data query system deployment of mobile agent middleware on the infrastructure system that multiple hardwares infrastructure and basis of software facility are formed.The system bottom be hardware infrastructure, have following three kinds:
(1) wireless sensor node: be the website of wireless sensor network, have independently calculating, storage capacity, and can carry out wireless broadcast communication by wireless channel and wireless protocols with other sensor nodes on every side.Wireless sensor node also has the variation that perception device can predict some characteristic of physical environment, as: temperature, light intensity, air pressure, acceleration or the like.The wireless sensor node volume is small, and present node can reach Centimeter Level size even millimeter level.Node usually is spread out over human masty place, or is difficult for the place of searching, adds the restriction of volume, and the energy supply of sensor node is limited often.But the static node (position is immutable) that has sustainable power supply as the gateway node of the interface that communicates with the base station often.A wireless sensor network has 1 usually as the sensor node of gateway node and a large amount of general sensor nodes.
(2) wireless sensor network management of base station: the conventional microcomputer system that server OS has been installed, storage and computing capability with big order of magnitude, have lasting supply of electric power, provide and gateway node between the wire communication interface between software and hardware.
(3) equipment connected in series between wireless sensor network and the network base station: wireless sensor network communicates by gateway node and network base station, connects the normally serial wired connection cable of gateway node and network base station, and communication link is comparatively stable.
Disposed and also will on the hardware facility basis, load following several basic software system after the hardware infrastructure:
(1) wireless sensor network operating system: be deployed in the systems soft ware on the wireless sensor node.The hardware device drivers of node is provided, process of moving on the management node and thread, the access interface of the basic communication protocol (physical layer and media access layer) of wireless personal area network communication protocol is provided, the energy of management node and the equipment control interface that node state changes are provided.More well-known wireless sensor network operating system has at present: TinyOS, Mantis OS etc.
(2) wireless sensor networks mobile agent middleware: be deployed in the software systems on the wireless sensor network operating system of node side, be used to provide support to mobile agent mechanism.Present existing wireless sensor networks mobile agent middleware platform has: the Agilla of department of computer science of University of Washington development, the present invention institute based on a kind of mobile agent middleware platform software DisWare be a kind of wireless sensor network middleware platform of developing by department of computer science of Nanjing Univ. of Posts and Telecommunications based on dual operating systems (TinyOS and Mantis OS).
(3) the wireless sensor network supervisory control system of network base station end: be deployed on the network management base station server, the interface facility to wireless sensor network control and monitoring is provided.
(4) network base station end mobile agent middleware system: be deployed on the wireless sensor network supervisory control system, provide, and the structure of mobile agent main body and the instrument that the agency inserts to network are provided to the mobile agent mechanism similar to node side.
(5) network base station Database Systems: be deployed in the systems soft ware on the network base station, be used to provide storage, management and the access function of mass data.The inventive method has made up a sensor network historical data base in these Database Systems, be used for the inquiry of historical data.
Disposed after the above basic software system, just can by the inventive method designed based on the sensor network data query system deployment of mobile agent middleware on the basic software of network base station end, and along with using or the change of user's request can simply replace to new inquiry system with former inquiry system and gets final product.
For convenience of description, we have following simple application example at supposition: develop a wireless sensor network query treatment system that the class database inquiry system form of graphic user interface is provided, the primary demand of this application provides graphic user interface that is similar to data base querying to the user, select the query requests parameter of various combinations for the user, system generates the query statement of class SQL in view of the above automatically, and sensor network is considered as the perception data query task that database is carried out the query statement appointment, the attribute list case form of Query Result with the inquiry appointment shown.
Suppose that the mobile agent middleware software basis that this system adopts is DisWare middleware platform (development of department of computer science of Nanjing Univ. of Posts and Telecommunications), briefly provide the specific implementation method of this system below:
(1). carry out demand analysis, determine to use graphical user interface to receive user's request, and provide graphic interface to show Query Result.For satisfying different ageing query requests, in graphic interface, provide immediate inquiring and historical query two kinds of query arguments.The parameter selection mode of immediate inquiring is as follows: use drop-down menu that the selection (can be 128ms, 256ms, 512ms, 1024ms, 2048ms, 4096ms or the like) of polling cycle length is provided, use text box that the selection of node number or the selection of node location scope are provided, use the multiselect frame that the selection of querying attributes is provided; The parameter selection mode of historical query is as follows: use text box that the selection of node number and all kinds of attribute-value ranges is provided, the clock selecting frame of two ejections of use is realized the selection of data collection date range.
(2). judge that according to the selection in the query requests graphic interface user's request belongs to any in historical query and the immediate inquiring, and produce corresponding query task.
(3). for the request of user's immediate inquiring, for query task generates following several query argument: length sampling period of the destination node scope of the code name of inquiry, inquiry, the attribute-name array of inquiry, inquiry, the fusion operator of inquiry (as: asking average calculating operation symbol avg (), summation operation symbol sum (), maximizing operator max () and the operator min () that minimizes) and corresponding grouping operational attribute name;
(4). according to the immediate inquiring required parameter of (3) generation, use SQL-like language to provide the description of immediate inquiring task, the query argument of selecting for following one group of user for example: the destination node scope is: in the rectangular area [{ 1,1}, { 5,5}] within node, the attribute of inquiry is by name: light, temperature, length sampling period of inquiry is 1024ms, the fusion computing of inquiry is: avr (light) and sum (temperature), and merge divide into groups the accordingly attribute of computing of computing and be called moteid.Corresponding immediate inquiring task description is:
select?avr(light)，sum(temperature)，moteid
where?motelocation?in[{1，1}，{5，5}]
group?by?moteid
from?sensomet
sample?period＝1024；
Determine the node number parameter of node number array according to the node location scope of inquiry again as inquiry, for example to above-described query task, calculate the position of judging which node from the base station by node location and belong to [{ 1,1}, { 5,5}] within the scope, then its node number is put within the array parameter.
(5). the program flow diagram of describing the design inquiry proxy according to the query task of (4) is as shown in Figure 4.In addition, cooperation between the mobile agent realizes by long-range tuple operation, if consider the situation that node energy exhausts, then also need design and act on behalf of migration strategy: the energy value that obtains present node before promptly each inquiry, and judge whether less than critical value, if then select a neighbor node of finding out recently, with this agent migration in the past, and this migration strategy joined in the program structure go;
(6). design the inquiry proxy process template according to (5), promptly with " inquiry agent " code of query argument, the grammer of Agent adopts the language syntax of acting on behalf of of DisWare middleware platform.
(7). according to the query argument of (3) and the inquiry proxy process template of (6), the conversion processing flow chart of design from the query requests parameter to " inquiry agent " program;
(8). the flow chart coding according to (7) is realized " conversion processing module ", and writes the driver and the stubs of " conversion processing module ", and " conversion processing module " tested.Driver module is an interface routine that transmits the various customer parameters of graphic user interface, and stubs then is that an Agent is printed display routine, is used to show the Agent code of generation;
(9). the generation process chart of design from " inquiry agent " code to " inquiry agent " main body, and the programming realization, mainly be to utilize the mobile agent generation module of the DisWare middleware platform of base station to be this inquiry " agent " assignment agent active stack, agent code piece, to act on behalf of heap space and act on behalf of reaction compartment;
(10). call acting on behalf of insertion mechanism and will inquiring about " agent " body portion and be slit into status message, code block message, active stack message, heap message and response message of DisWare platform, then these message are sent to according to the order of sequence on the node in the destination node location scope of analyzing the inquiry that produces in (2); (node receives that inquiry " agent " will should " agent " main body carry out query task by operation afterwards: the data of cyclic samples perception specified attribute, carry out fusion treatment, carry out long-range insertion tuple command then tuple is returned to user base station).
(11). in network management base station design tuple message sink module, the receiving function of the wireless sensor network interface module by calling the DisWare platform software comes monitoring reception to send it back base station message to all from network, and message screened, only keep tuple message wherein;
(12). the cache module of design Query Result tuple.Resolve monitoring the tuple message that obtains from the sensor network interface module in (11), extract tuple wherein, the tuple of calling the DisWare platform software of network management base station is then inserted in the tuple space that operation is inserted into this tuple at DisWare platform base station end and is gone.(must at first the tuple space of DisWare platform base station end be quoted and put in this module);
(13). accessing operation processing modules such as the storage of planned network management of base station tuple space and extraction are used for the Query Result (the access visit operating function of all tuple spaces of mobile agent middleware is identical on this accessing operation and the node) that buffer memory and inquiry receive.
(14). be designed for the tuple template of in tuple space, searching the Query Result tuple, the attribute number that tuple is inserted in the tuple of operation in the attribute number of inquiry tuple template and the inquiry proxy process template in (6) is identical, and template has inserts the function that the type of each attribute of the tuple of operating is judged to tuple in the inquiry proxy process template in (6);
(15). design and programming realize the receiving processing module of Query Result, design the tuple query statement of the DisWare plateform system of a thread dispatching base station end, this query statement will be sought the Query Result tuple that is sent back the base station by inquiry " agent " according to first pack module in tuple space.This thread is designed to the thread of circular flow, when system receives user's termination query statement (receiving from graphical user interface), stops;
(16). the Query Result tuple data that obtains in (15) is carried out data type conversion, extract the required property value of wherein inquiry and be put in the Query Result form, then this form is shown with graphic form with the form of character string.All modules of integrated then (8), (9), (10), (11) and (15) form whole immediate inquiring processing module;
(17). select at the historical query parameter in the historical query task in (2) and (1), the query task parameter of determining historical query is the combination in any of following parameter: node number, various range of attributes (as: x1＜light＜x2, y1＜temperature＜y2 ...), Query Dates scope (date1 to date2).According to query task parameter and immediate inquiring data result history design database.The historical data base of native system is designed to comprise a historical query operation sheet and historical query result data table two form, query statement of each bar record expression in the historical query operation sheet, comprise following several project: the code name of inquiry, querying attributes name (identical) with the statement in (4), the operator of inquiry, the node i d of inquiry.Query Result data that the base station receives of each query statement record expression in the historical query result data table comprise following several project: the code name of data record code name, inquiry, polling cycle number, attribute-name and property value.Write the program code that historical data base is connected then;
(18). design query manipulation and Query Result memory module, the immediate inquiring result data that (16) are produced deposits in the historical query tables of data of historical data base, and converts query task and the parameter that (4) produce to historical query operation sheet that the query manipulation record deposits historical data base in.
(19) design realizes the historical data form is carried out the module of query manipulation, be combined into a complete SQL query statement according to the query argument of determining in (17), in his-and-hers watches, retrieve qualified record after all record traversals and constitute a record set, for every in record set record, all Query Result object of instantiation is stored in the chained list class, calls for Query Result image display module or user program.
(20). all modules of design in integrated (17), (18) and (19) form whole historical query processing module.
(21). according to the query requests parameter in the demand analysis in (1) and (3), adopt the java applet Programming with Pascal Language to realize patterned user inquiring request interface, analysis by (2) will be divided into two guidance panels of immediate inquiring and historical query in this graphical interfaces;
(22). design and programming realize the user interface of Query Result receiving processing module, adopt patterned user interface, show the Query Result of each sampling period with the form of form, and provide inquiry to stop the function that order button realizes stopping this inquiry agent;
(23). the interface in the module in integrated (16) and (20) and (21) and (22), form whole wireless sensor network data query system, dispose the wireless sensor network data query system according to the software and hardware architecture layer of structure of Fig. 3 then.
Claims (1)
1. development approach based on the sensor network data query system of mobile agent middleware is characterized in that the step of this development approach is:
Step 1). carry out demand analysis, determine the form and the parameter of the query requests that the user will import, the form and the structure of the result data that returns with inquiry determine that the user is to the requirement of ageing, the accuracy of query processing and to the requirement of Query Result representation;
Step 2). according to the time range of query requests and effective the requirement query requests is divided into two types of historical query and immediate inquirings, respectively to pending;
Step 3). step 1) is analyzed the selection of target area that the user's immediate inquiring request analysis that obtains becomes query task, data field scope, time domain scope, polling cycle, query manipulation and merged operator;
Step 4). according to the detailed functions of step 3) analysis and consult task, and write the query function specification;
Step 5). according to the collaboration diagram between the program flow diagram of query function specification design inquiry proxy, state transition diagram, the mobile agent with act on behalf of migration strategy;
Step 6). according to step 5) and according to mobile agent middleware instruction syntax, design comprises " inquiry proxy " Code Template of query manipulation parameter;
Step 7). the conversion processing flow chart according to step 3) and step 6) design from the query requests parameter to " inquiry proxy " code;
Step 8). the flow chart according to step 7) is write the program code of " conversion processing module ", and writes the driver and the stubs of " conversion processing module ", and " conversion processing module " tested;
Step 9). the flow chart of the generation processing module of design from " inquiry proxy code " to " inquiry proxy main body ", and programming realizes;
Step 10). " network insert handle " module of design " inquiry proxy " main body, " inquiry proxy " intelligent agent that insertion mechanism will generate of acting on behalf of of promptly calling the mobile agent middleware sends in wireless sensor network; Coding is realized " network insertion processing module " and is carried out module testing then;
Step 11). the sensor network interface module of the network abstraction interface of mobile agent middleware is called in design, is mainly used in the network management base station is mail in monitoring from sensor network message bag;
Step 12). data structures such as the tuple of planned network management of base station and tuple space are used for access and monitor the Query Result data acquire from the sensor network interface module, the data query structural design be with node on the tuple space data structure unified structure form of mobile agent middleware;
Step 13). the data access according to tuple space on the node is handled, and the data access processing module of operation is stored and extracted to design and realization to network management base station tuple space, is used for the Query Result that buffer memory and inquiry receive;
Step 14). be designed for the tuple template of in tuple space, searching the Query Result tuple, the data structure of tuple template is with reference to the tuple data structural design that designs in the step 12), and contained range information is according to step 2 in the template) in the user inquiring parameter design;
Step 15). design and programming realize the Query Result receiving processing module, and this module mainly utilizes tuple template and tuple space query manipulation to realize being stored in the inquiry that receives Query Result in the tuple space;
Step 16). all modules of integrated step 8), step 9), step 10), step 11) and step 15) form whole immediate inquiring processing module;
Step 17). according to immediate inquiring result's data format and historical query parameter, the enquiry of historical data storehouse of design stores historical query operation note and historical query data, and write the operation code that fulfillment database connects;
Step 18). design realizes historical data is carried out the module of database storage operation, realizes the preservation of historical query record and data query;
Step 19). design realizes historical data is carried out the module of database query operations, realizes the inquiry to historical query record and data query;
Step 20). integrated step 17) database and step 18) and step 19) module, form whole historical query processing module;
Step 21). according to step 2) and the analysis result of step 3), design and programming realize the user inquiring interface of query requests, the form of user inquiring interface can be graphical user interface, command line interface or application programming interfaces;
Step 22). design and programming realize that the Query Result of immediate inquiring and two kinds of inquiries of historical query returns interface, and interface shape can be graphical user interface, command line interface or application programming interfaces;
Step 23). integrated step 16), step 20), step 21) and step 22) all processing modules and user interface form whole sensor network data query system.
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