JP2013037656A - Server load reduction method in client server system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a client server system for allowing clients to receive good responses from a server while suppressing a load of the server as much as possible even if the number of clients is increased in a network in the form of a client server system.SOLUTION: A client server system includes a server provided with means for receiving access from clients, means for managing notification information that is managed for every client and to be notified to the every client, and response means for transmitting request contents asking that prescribed contents should be transmitted to a client to be a target of the notification information to a transmission source client as a response to the received access.

Description

  The present invention relates to a network system in the form of a client server, and particularly relates to an apparatus that reduces the load on the server.

  In general, in a client-server system, the load on the server increases as the number of clients increases. As an example, assume a situation in which the clients 101 to 103 access (polling) the server 104 at predetermined time intervals in a network environment as shown in FIG.

  The sequence shown in FIG. 2 is for the case where the polling interval is 10 s (10 seconds). As shown in the figure, the time interval from when the client 101 first polls the server 104 (communication 111 and communication 121) until the next polling (communication 112 and communication 122) is 10 s. The same applies to other clients. In the figure, a state until the client 102 detects an event for the client 102 generated in the server 104 is shown.

  As described above, in the client server system illustrated in FIG. 2, when an event occurs for a certain client in the server 104, a maximum of 10 s is required until the client can detect the event. In other words, the average time until an event is detected increases in proportion to the length of the polling interval.

  In the client server system, it goes without saying that the larger the number of clients managed by one server, the better. However, if the number of clients is increased in the above system, the number of polls per unit time increases accordingly, which places a heavy burden on the server.

  The easiest way to improve this is to increase the client polling interval. For example, it is 30 s instead of 10 s described above. Naturally, if the polling interval is tripled, the number of clients that is theoretically tripled can be managed at the same server load as in the case of 10 s. In other words, increasing the polling interval makes it possible to manage clients that are theoretically infinite. This is because it is only necessary to increase the polling interval according to the number of clients.

  However, this has the following problems. For example, if the polling interval is set to 3600 s (1 hour), it will take a maximum of 3600 s until the client can detect an event for the client that has occurred in the server. In other words, the response to the client is delayed that much. This is especially a problem when a highly urgent event has occurred.

  An invention for improving such a problem is disclosed in Patent Document 1. In this case, when clients communicate with each other through a server, information to be managed by the server is classified into information to be managed by the server, information to be managed by the server is communicated through the server, and information not to be managed is classified into the client. They communicate directly with each other. As a result, communication between clients via the server can be performed with good response while reducing the load on the server.

  However, the invention disclosed in Patent Document 1 is based on the premise that there is information that the server does not need to manage, that is, information that is generally less important. For this reason, in the case of a system in which a large amount of information to be managed by the server (highly important information) occupies a large amount of communication to the server, naturally, as with conventional problems, the burden on the server is increased. Become heavier.

International Publication No. WO01 / 057578 Pamphlet

  The present invention solves such a problem. That is, in a network of client server systems, it is to provide a client server system that does not increase the load on the server as much as possible even if the number of clients is increased, and also provides a good response from the server to the client.

  According to a first aspect of the present invention, a server and a plurality of clients are connected to a network, and the client is a server in a client server system that accesses the server at a predetermined time interval. Means for receiving the access, means for managing the notification information that is managed for each client and should be notified to each client, and "send predetermined contents to the client that is the target of the notification information" And a response means for transmitting a request including the request to the transmission source client as a response to the received access.

  Preferably, the predetermined content is a trigger for an operation of “a client as a target of notification information accesses the server and acquires the notification information”.

  According to a second aspect of the present invention, a server and a plurality of clients are connected to a network, and the client is a server in a client server system that accesses the server at a predetermined time interval. Means for receiving access, means for managing notification information that is managed for each client and should be notified to each client, and when there are multiple pieces of notification information, determines the order of notification information based on predetermined conditions Then, the response to the received access includes the content “send the predetermined content to the client that is the target of the notification information” as the response to the received access regarding the predetermined number of notification information from the top of the ranking. And a response means for transmitting the request to the transmission source client.

  Preferably, the predetermined condition is “priority for a client as a target of notification information” and / or “unprocessed time of notification information in a server”.

  Preferably, the predetermined content is a trigger for an operation of “a client as a target of notification information accesses the server and acquires the notification information”.

  A third form according to the present invention is a client server system in which a server and a plurality of clients are connected to a network, and the client accesses the server at a predetermined time interval. Means for receiving access from a client, means for managing notification information that is managed for each client and should be notified to each client, and "send predetermined contents to the client that is the target of the notification information" The client server system comprises response means for transmitting the request contents to the transmission source client as a response to the received access.

  According to a fourth aspect of the present invention, there is a client server system in which a server and a plurality of clients are connected to a network, and the client accesses the server at a predetermined time interval. A means for receiving access, a means for managing notification information to be notified to each client and to be notified to each client, and when there are a plurality of pieces of notification information, the order of the notification information is determined based on a predetermined condition. As a response to the received access, a request including the content “send the predetermined content to the client that is the target of the notification information” as the response to the received access regarding the predetermined number of notification information from the top of the ranking And a response means for sending the message to the transmission source client. That.

  According to a fifth aspect of the present invention, a server and a plurality of clients are network-connected, and the client accesses the server in a client server system that accesses the server at a predetermined time interval. , A means for managing notification information that is managed for each client and is to be notified to each client, and a request content such as “send predetermined contents to the client that is the target of the notification information”. This is a program that functions as a response means that transmits an included response to a transmission source client as a received access response.

  Preferably, the predetermined content is a trigger for an operation of “a client as a target of notification information accesses the server and acquires the notification information”.

  In a sixth embodiment according to the present invention, a server and a plurality of clients are connected to a network, and the client accesses the server in a client server system that accesses the server at a predetermined time interval. Means for receiving notifications, means for managing notification information to be notified to each client, and when there are a plurality of pieces of notification information, the order of notification information is determined based on predetermined conditions, As a response to the received access, a request including the content “send the predetermined content to the client that is the target of the notification information” as the response to the received access regarding the predetermined number of notification information from the top of the ranking. This is a program that functions as a response means for sending to the transmission source client.

  Preferably, the predetermined condition is “priority for a client as a target of notification information” and / or “unprocessed time of notification information in a server”.

  Preferably, the predetermined content is a trigger for an operation of “a client as a target of notification information accesses the server and acquires the notification information”.

  According to the first aspect of the present invention, the event occurrence notification request for a specific client generated in the server is included in the polling response of the other client, thereby increasing the number of clients in order to reduce the load on the server. Even if the interval is increased, the specific client can detect the event occurrence for itself without delay. Furthermore, the specific client that received the event occurrence notification uses this reception as a trigger to access the server and acquire the content of the event that has occurred to itself, thereby increasing the importance and confidentiality. Even if the event has such a content, the content can be acquired while maintaining a good response.

  Furthermore, according to the second aspect of the present invention, the event occurrence notification request transmitted from the server is determined based on the importance of the event and the unprocessed time of the event, so that the number of clients increases. Even if a large number of events occur, the client can be notified efficiently.

  In addition, according to another aspect, by changing the priority according to the unprocessed time of the event, it is possible to avoid the problem that an event with a low priority is not notified over a long period of time.

  Further, according to another embodiment, by changing the number of events notified to the polled client according to the processing capability of the client, event notification to the client where the event has occurred can be made more efficient. Can be done automatically.

Embodiments according to the present invention will be described below with reference to the drawings.
[Example 1]

  FIG. 3 is a sequence diagram according to the present embodiment. As shown in the figure, in this embodiment, the polling interval is set to 30 s. In the description of FIG. 2, it is 10 s, but the interval is longer than this. In this way, even if the number of clients is tripled, the load on the server is theoretically the same as in FIG.

  In the present invention, in order to prevent a decrease in response from the server to the client due to an increase in the polling interval, in response to polling from an arbitrary client (an event does not necessarily have to occur in the client), Includes a request for event notification to the client where the event occurred. The client receiving this response notifies the event occurrence to the client in which the event has occurred. In this way, the client in which the event has occurred can receive the event occurrence notification from other clients and detect the occurrence of the event regardless of its own polling interval. That is, for a client in which an event has occurred, reception of an event occurrence notification transmitted from another client is a trigger for accessing the server and acquiring the contents of the event.

FIG. 3 illustrates a case where an event for the client 102 occurs in the server 104. As can be seen from the figure, the client 102 can detect the event occurrence without waiting for its own polling time. As a result, the average time until the client 102 detects an event can be significantly shorter than the polling interval.
[Block Diagram]

  FIG. 4 is a block diagram of the server 104 according to the present embodiment.

  When an event for the client occurs, the event management unit 404 registers this in the event storage area 406.

  Access receiving means 402 is means for receiving polling from the client via the network interface 401.

  When there is an access from a client, the event presence / absence determination unit 403 determines whether there is an event for a client other than the client with reference to the event storage area 406. If there is an event as a result of the determination, the response means 405 described later is notified to that effect.

The response means 405 responds to the polling from the client received by the access reception means 402. If the notification is received from the event existence determination means 403 at the time of response, the response storage area 405 Event information is read from 406, and the client responds with the information. If there are multiple events, read all of them and respond.
[Server operation flow]

  FIG. 5 is an operation flow of the server 104.

  In step 501, it is determined whether there is an access from a client. If there is an access as a result of the determination, the process proceeds to the next step, and if not, the reception determination is repeated.

  In step 502, it is determined with reference to the event storage area 406 whether there is an event. As a result of the determination, if it exists, the process proceeds to the next step, otherwise returns to the reception determination.

In step 503, the event is read from the event storage area 406, and this is included in the response contents for the access received in step 501, and responds.
[Example 2]

  As described above, by increasing the client polling interval, the number of clients can be increased without increasing the load on the server 104. However, if the number of clients is increased, the number of events will increase accordingly.

  Notifying all the events that have occurred to the client that has polled at one time is a heavy burden on the client. Therefore, in this embodiment, the server 104 ranks events to be notified to the clients, and notifies each client that has been polled one by one in order from the top, thereby reducing the load on the client. Efficient event notification.

  FIG. 6 shows the operation described above. This is a list of events managed by the server 104 in the event storage area 406. As shown in the drawing, each event is given an attribute of a client name to be notified, an event priority, and an unprocessed time.

  The event priority means the urgency and importance for the client, and the higher the priority, the more immediate processing is expected. Predetermined priority levels (S, A, B, C in descending order of priority in the figure) corresponding to the type of event are determined in advance. On the other hand, the unprocessed time is an elapsed time since the event occurred in the server 104. Generally, the longer the unprocessed time, the more immediate processing is required.

  The event management means 404 of the server 104 registers the event priority as the first key when registering the generated event in the event storage area 406. Next, the ranking in the same event priority is sorted and registered so that the longer the unprocessed time is, the higher the ranking is.

When polling from a client is received, an event is notified from the host one by one for each polling. As a result, the target client can be notified in the order of events that are estimated to have the highest importance and urgency.
[Block Diagram]

  FIG. 7 is a block diagram of the server 104 in the second embodiment. As shown in the figure, the event management means 404 is provided with an event sorting means 701 that is a means for sorting events using priority and unprocessed time as keys. Since the remaining means are the same as those in the first embodiment, the description thereof is omitted.

  FIG. 8 is an operation flow of the server 104 in the second embodiment. As shown in the figure, in step 802 of the event management task, the generated events are sorted in the order of priority and unprocessed time and registered in the event storage area 406.

Next, in step 803 of the main task, the event stored in the event storage area 406 is notified to the client that has polled in order from the top.
[Other Examples]
In the second embodiment, the event is managed by the priority and the unprocessed time. However, when the unprocessed time exceeds a predetermined threshold, the priority may be increased. For example, when the unprocessed time of an event of priority A exceeds 100 s, it is changed to priority S. In this case, it is desirable to reset the unprocessed time to 0 (zero) once.

In the second embodiment, the event that occurred in the server 104 is notified to the client that has polled one by one. However, considering the processing capability of the client, several events are reported in order from the highest priority. You can also For example, when the processing capability of the client is high, a plurality of events can be notified.
[Summary]

  According to the first aspect of the present invention, an event occurrence notification request for a specific client generated in a server is included in a polling response of another client, thereby increasing the number of clients in order to reduce the load on the server, Even if the polling interval is increased, the specific client can detect the event occurrence for itself without delay. Furthermore, the specific client that received the event occurrence notification uses this reception as a trigger to access the server and acquire the content of the event that has occurred to itself, thereby increasing the importance and confidentiality. Even if the event has such a content, the content can be acquired while maintaining a good response.

  Furthermore, according to the second aspect of the present invention, the event occurrence notification request transmitted from the server is determined in order of transmission based on the importance of the event and the unprocessed time of the event by the server. Even if the number of events increases and many events occur, the client can be notified efficiently.

  In addition, according to another aspect, by changing the priority according to the unprocessed time of the event, it is possible to avoid the problem that an event with a low priority is not notified over a long period of time.

Further, according to another embodiment, by changing the number of events notified to the polled client according to the processing capability of the client, event notification to the client where the event has occurred can be made more efficient. Can be done automatically.

Overall system diagram Prior art sequence diagram Example 1 Sequence diagram Example 1 Server block diagram Example 1 Server operation flow Example 2 Order of sending event notification requests on the server side Example 2 Server block diagram Example 2 Server operation flow

402 Access receiving means 404 Event management means 405 Response means

Claims (12)

A server and a plurality of clients are connected to a network, and the client is a server in a client server system that accesses the server at a predetermined time interval.
A means of receiving access from clients;
A means for managing notification information that is managed for each client and should be notified to each client;
A response unit that transmits a request including the content “send predetermined content to a client as a target of the notification information” to the transmission source client as a response to the received access.   2. The server according to claim 1, wherein the predetermined content is a trigger for an operation of “the client that is the target of the notification information accesses the server and acquires the notification information”. A server and a plurality of clients are connected to a network, and the client is a server in a client server system that accesses the server at a predetermined time interval.
A means of receiving access from clients;
A means for managing notification information that is managed for each client and should be notified to each client;
When the number of pieces of notification information is plural, the ranking of the notification information is determined based on a predetermined condition, and as a response to the received access, regarding the predetermined number of notification information from the top of the ranking, the received access information A server comprising response means for transmitting a request including a content “send predetermined content to a client as a target of the notification information” as a response to the transmission source client.   The server according to claim 3, wherein the predetermined condition is “priority for a client as a target of the notification information” and / or “unprocessed time of the notification information in the server”.   5. The server according to claim 3, wherein the predetermined content is a trigger for an operation of “the client that is the target of the notification information accesses the server and acquires the notification information”. A server and a plurality of clients are connected to a network, and the client is a client server system that accesses the server at predetermined time intervals.
The server
Means for receiving access from a given client;
A means for managing notification information that is managed for each client and should be notified to each client;
A response means for transmitting a request content “send predetermined content to the client as a target of the notification information” to the transmission source client as a response to the received access;
A client server system comprising: There is a client server system in which a server and a plurality of clients are connected to a network, and the client accesses the server at a predetermined time interval.
The server
A means of receiving access from clients;
A means for managing notification information that is managed for each client and should be notified to each client;
When the number of pieces of notification information is plural, the ranking of the notification information is determined based on a predetermined condition, and as a response to the received access, regarding the predetermined number of notification information from the top of the ranking, the received access information A response means for sending a request including the content “send the predetermined content to the client that is the target of the notification information” as a response to the transmission source client;
A client server system comprising: A server and a plurality of clients are network-connected, and the client accesses the server in a client server system that accesses the server at a predetermined time interval.
A means of receiving access from clients;
A means for managing notification information that is managed for each client and should be notified to each client;
Function as a response means for transmitting a response including a request content “send predetermined content to the client as a target of the notification information” to the transmission source client as a response to the received access Program to make.   The program according to claim 8, wherein the predetermined content is a trigger for an operation of “the client that is a target of notification information accesses the server and acquires the notification information”. A server and a plurality of clients are network-connected, and the client accesses the server in a client server system that accesses the server at a predetermined time interval.
A means of receiving access from clients;
A means for managing notification information that is managed for each client and should be notified to each client;
When the number of pieces of notification information is plural, the ranking of the notification information is determined based on a predetermined condition, and as a response to the received access, regarding the predetermined number of notification information from the top of the ranking, the received access information A program that functions as a response unit that transmits a request including a content “send predetermined content to a client as a target of the notification information” to a transmission source client as a response.   The program according to claim 10, wherein the predetermined condition is “priority for a client as a target of the notification information” and / or “unprocessed time of the notification information in the server”. The program according to claim 10 or 11, wherein the predetermined content is a trigger for an operation of "the client that is the target of notification information accesses the server and acquires the notification information".