Abstract: A method for recording metadata for web caching in a cloud environment is provided. The method includes steps of: (a) a first web server caching file information of a first web server container corresponding to itself in a first cache memory in the first web server container; (b) the first web server recording metadata of the first cache memory in a common file storage; and (c) the first web server, if the first web server is scaled out by adding a second web server, allowing the second web server to access the common file storage, to thereby allow the metadata to be recorded in a second cache memory in a second web server container corresponding to the second web server.

Abstract: A web server is provided. The web server includes a communication part for receiving an HTTP request from an entity connected by network and communicating with at least one WAS; and a processor for performing at least one of (i) a process of transmitting the HTTP request received from the entity to a specific WAS selected among the at least one WAS and then receiving information on an HTTP session corresponding to the specific WAS from the specific WAS when receiving an HTTP response from the specific WAS in response to the HTTP request, thereby retaining the information on the HTTP session and (ii) a process of transmitting a PING signal and then receiving the information on the HTTP session corresponding to the specific WAS from the specific WAS when receiving a PONG signal in response to the PING signal, thereby retaining the information on the HTTP session.

Abstract: A method for auto-scaling at least one web server and at least one WAS (Web Application Server) is provided. The method includes a WAS administrating server grouping, as a first service group, both at least one first web server and at least one first WAS, which are connected with each other to provide a first application service, and grouping, as a second service group, both at least one second web server and at least one second WAS, which are connected with each other to provide a second application service, to thereby create at least two groups each of which includes at least its corresponding pair of web server and WAS, and the WAS administrating server allowing each of the grouped pairs of the web servers and the WAS's to be scaled out or scaled in, independently, by a process of scaling-out or scaling-in.

Abstract: A method controlling near caches in a distributed cache environment including distributed cache servers is provided. The method includes steps of: a specific distributed cache server among the distributed cache servers, if a request signal for original cache data is obtained from a client node, transmitting replicated cache data for the original cache data to the client node, to support the client node to store and refer to the replicated cache data in its corresponding near cache storage part, and managing a reference map with a correspondence between the client node referring to the replicated cache data, and the original cache data; and if the original cache data is changed, checking the number of the client nodes referring to the replicated cache data by referring to the reference map, and invalidating the replicated cache data according to the number of the checked client nodes.

Abstract: A multicasting method in a distributed cache environment is provided. The multicasting method includes steps of: (a) a specific distributed cache server among a plurality of distributed cache servers in the distributed cache environment, transmitting certain messages to client nodes including at least one another distributed cache server among the plurality of distributed cache servers in the distributed cache environment through multicast and then sequentially registering, in an unacknowledged message map, UNACK messages representing messages without their corresponding ACK messages from their corresponding client nodes among the certain messages; and (b) the specific distributed cache server checking the number of the UNACK messages registered in the unacknowledged message map and, if the number reaches a first predetermined number, stopping transmission of additional messages to the client nodes through the multicast.

Abstract: A method for supporting UI development of an application in a graphical user interface environment is provided. The method includes steps of: (a) a server, if an intention of a user to start editing an action which is a set of UI changes is detected through GUI environment, acquiring a previous state of the UI model, wherein the previous state is a state before editing the action; and (b) the server, if an intention of the user to finish editing the action is detected through the GUI environment, comparing a changed state of the UI model with the previous state thereof to acquire a comparison result, where information on the action having been completely edited is reflected on the previous state of the UI model to acquire the changed state thereof; and recording the information on the action having been completely edited by referring to the comparison result.

Abstract: A method for providing a trial environment to enable a user to try out at least one application in a cloud environment is provided. The method includes steps of: (a) if a selection of an application that the user prefers to try out is detected, acquiring information on a platform that is appropriate to run the application from related information of the application, and determining whether or not the trial environment built on the appropriate platform is available for the application to be run thereon; (b) if the trial environment is detected not to be available by referring to a result of the determination, configuring and setting the trial environment built on the appropriate platform to be available on the basis of the related information of the application; and (c) enabling the user to run the application in the available trial environment.

Abstract: Provided is a method for managing a cloud server by using a manager server in a cloud environment, the method including receiving server template information of a first cloud server in a cloud domain, to which the manager server pertains, from the first cloud server, generating server setting information for a cloud server in the cloud domain based on the server template information of the first cloud server, and transmitting the server setting information for the cloud server to the first cloud server to drive the first cloud server.

Abstract: A method for increasing throughputs of multiple services processed by multiple threads on conditions that the multiple services include at least a first, a second, and a third services and the multiple threads include at least a first and a second thread including steps of: (a) if the first service being processed by the first thread calls the second service, supporting the second thread to process the second service; and (b) while the second service is being processed, supporting the first thread to process the third service; and (c) if the processing of the second service is completed, supporting (i) the first thread or (ii) one or more other threads except the first thread to resume a processing of an unprocessed part of the first service, by using a result value acquired by the processing of the second service.

Abstract: A method for clustering objects distributed in multiple servers to allow one or more distributed objects to be used as if they were one object is provided. The method includes steps of: (a) a specific server transmitting to a client a remote controller including a particular communication object capable of supporting communications between the client and the specific server; and (b) the specific server supporting the client to include at least one communication object, capable of supporting communications between the client and at least one server, respectively, except the specific server within the cluster, in the remote controller, to thereby support the client to be communicable with all the servers in the cluster by acquiring, and providing to the client, the at least one communication object by referring to information on all the servers within the cluster.

Abstract: A method for managing a thread pool size dynamically using elemental task throughputs is provided. The method includes steps of: a computing device (a) calculating a first representative task throughput corresponding to a first group including elemental task throughputs during the first time section, and then increasing a maximum thread value for the first time section and setting it as a maximum thread value for the second time section; (b) calculating a second representative task throughput corresponding to a second group including elemental task throughputs during the second time section; and (c) comparing the first and the second representative task throughput and then, if the latter is greater than the former by an amount equal to or greater than a preset first threshold value, increasing the maximum thread value for the second time section and setting it as a maximum thread value for a third time section.

Abstract: A method for assigning relative order to messages by using vector clocks under a distributed server environment is disclosed. The method includes the steps of: (a) a server assigning a vector clock to a message and storing the message to which the vector clock is assigned if the message required to be assigned relative order is acquired through a network; and (b) the server transmitting an increased vector clock to one or more other servers connected with itself through the network and supporting said other servers to update their vector clocks by referring to the increased vector clock.

Abstract: A method for setting transactions of multiple data objects is provided. The method includes steps of: (a) a server acquiring information on multiple data objects used for a service object, and obtaining information on data sources which are set to correspond respectively to the data objects by referring to a setting file; and (b) the server determining the multiple data objects to be used by local transactions or distributed transactions by referring to the information on the data source.

Abstract: A method for providing a framework to develop a client application executed on multiple platforms is disclosed. The method includes steps of: (a) an apparatus for providing a framework acquiring information on platform independent user interface (UI) and information on business logic written by using a general-purpose programming language; and (b) the apparatus performing (i) a process for generating a platform-dependent UI code corresponding to the acquired information on the platform independent UI as UI code for a target platform among the multiple platforms and (ii) a process for generating business logic code corresponding to the acquired information on the business logic as business logic code for the target platform.

Abstract: A method for minimizing lock contention among threads in a multithreaded system is disclosed. The method includes the steps of: (a) a processor causing a control thread, if information on a task is acquired by the control thread, to acquire a lock to thereby put the information on a task into a specific task queue which satisfies a certain condition among multiple task queues; and (b) the processor causing a specified worker thread corresponding to the specific task queue among multiple worker threads, if the lock held by the control thread is released, to acquire a lock to thereby get a task stored in the specific task queue.

Abstract: A method for distributing a file descriptor in a web server is disclosed. The method includes the steps of: (a) a listener processor, if acquiring at least one file descriptor representing a connection of a network between the web server and at least one client, transmitting the at least one file descriptor to a specific kernel buffer corresponding to a specified handler processor among at least one handler processor for handling at least one service request corresponding to the file descriptor, by referring to the number of file descriptors stored in each kernel buffer corresponding to each handler processor; and (b) the specified handler processor handling a service request of a specific client by receiving the file descriptor from the specific kernel buffer.

Abstract: Disclosed is a cache management apparatus based on a distributed environment. The cache management apparatus includes a local cache that stores a preset amount of first cache data; a cache distribution state view configured to have the record of location and state information about the first cache data stored in the local cash and second cache data stored in the other nodes; a synchronization processing unit configured to synchronize the location and state information about the first and second cache data. Further, the cache management apparatus includes a distributed cache calculation controlling unit, upon receipt of a request for particular cache data from any application, configured to identify the location of the requested particular cache data and to retrieve the requested cache data from the other nodes or the local cache to provide it to the application.

Abstract: A method for managing connections using a dummy HTTP, the method comprising: upon receiving an HTTP request from a client, establishing, by a Web server, a connection to a Web application server to transmit the HTTP request to the Web application server over the connection; transmitting, by the Web server, an HTTP response received from the Web application server to the client; and continuing, by the Web server, the connection by exchanging a dummy HTTP request and a dummy HTTP response with the Web application server when a count of a duration time of the connection reaches a preset survival check time.

Abstract: A method includes performing a check-out process of fetching a program to be modified from an operating space to a development space, performing a modification task on the checked-out program in the development space, selecting a target program of the operating space having a fetch relationship with the modified program when the modification task is completed, changing the selected target program so that the selected target program is fetched, performing simulations on the modified program through an association between the modified program and the target program, and performing a check-in process of updating contents of the modified program by incorporating the contents of the modified program into the operating space when program development is completed.