405 results about "File caching" patented technology

The present invention provides a novel client side caching (CSC) infrastructure that supports transition states at the directory level to facilitate a seamless operation across connectivity states between client and remote server. More specifically, persistent caching is performed to safeguard the user (e.g., client) and/or the client applications across connectivity interruptions and/or bandwidth changes. This is accomplished in part by caching to a client data store the desirable file(s) together with the appropriate file access parameters. Moreover, the client maintains access to cached files during periods of disconnect. Furthermore, portions of a path can be offline while other portions upstream can remain online. CSC operates on the logical path which cooperates with DFS which operates on the physical path to keep track of files cached, accessed and changes in the directories. In addition, truth on the client is facilitated whether or not a conflict of file copies exists.

A system for scanning a file for malicious codes may include a client agent running in a client computer and a scan server running in a server computer, the client computer and the server computer communicating over a computer network. The client agent may be configured to locally receive a scan request to scan a target file for malicious codes and to communicate with the scan server to scan the target file using a scan engine running in the server computer. The scan server in communication with the client agent allows the scan engine to scan the target file by issuing file I/O requests to access the target file located in the client computer. The client agent may be configured to check for digital signatures and to maintain a file cache of previously scanned files to minimize network traffic.

A computer gateway for an intranet of computers, including a scanner for scanning incoming files from the Internet and deriving security profiles therefor, the security profiles being lists of computer commands that the files are programmed to perform, a file cache for storing files, a security profile cache for storing security profiles for files, and a security policy cache for storing security policies for client computers within an intranet, the security policies including a list of restrictions for files that are transmitted to intranet computers. A method and a computer-readable storage medium are also described and claimed.

The present invention provides a novel client side caching (CSC) infrastructure that supports transition states at the directory level to facilitate a seamless operation across connectivity states between client and remote server. More specifically, persistent caching is performed to safeguard the user (e.g., client) and/or the client applications across connectivity interruptions and/or bandwidth changes. This is accomplished in part by caching to a client data store the desirable file(s) together with the appropriate file access parameters. Moreover, the client maintains access to cached files during periods of disconnect. Furthermore, portions of a path can be offline while other portions upstream can remain online. CSC operates on the logical path which cooperates with DFS which operates on the physical path to keep track of files cached, accessed and changes in the directories. In addition, truth on the client is facilitated whether or not a conflict of file copies exists.

Systems and methods including storage systems that employ local file caching processes and that generate state variables to record, for subsequent use, intermediate states of a file hash process. In certain specific examples, there are systems that interrupt a hash process as it processes the data blocks of a file, and stores the current product of the interrupted hash process as a state variable that represents the hash value generated from the data blocks processed prior to the interruption. After interruption, the hash process continues processing the file data blocks. The stored state variables may be organized into a table that associates the state variables with the range of data blocks that were processed to generate the respective state variable. Such exemplary systems can be used with any type of storage system, including filers, database systems or other storage applications.

According to one embodiment, there is provided a playback apparatus which plays back content including an encrypted video object and an encrypted resource file, including a memory including a file cache area, a module configured to decrypt the video object, a playback process module configured to play back the decrypted video object and to output a resource file acquisition request, a module configured to determine whether the resource file is decrypted, to decrypt the resource file, to write the decrypted resource file over the encrypted resource file, to update the management information, and to send the decrypted resource file to the playback process module, and a module configured to determine whether the resource file is decrypted, to encrypt the decrypted resource file, to write the encrypted resource file over the decrypted resource file, to update the management information, and to send the encrypted resource file to the storage.

A method, system, and computer usable program product for selective memory donation in a virtual real memory environment are provided in the illustrative embodiments. A virtual machine receives a request for memory donation. A component of the virtual machine determines whether a portion of a memory space being used for file caching exceeds a threshold. The determining forms a threshold determination, and the portion of the memory space being used for file caching forms a file cache. If the threshold determination is false, the component ignores the request. If the threshold determination is true, a component of the virtual machine releases a part of the file cache that exceeds the threshold. The part of the file cache forms a released file cache. In response to the request, the virtual machine makes the released file cache available to a requester of the request.

A robust and reliable mechanism is disclosed for detecting whether a system has (or may have) been booted into a compromised or otherwise unprotected environment, so that a persisted clean file cache can be used across boots when appropriate. As such security scanning of files. A clean file cache can be maintained and used by a security application to avoid unnecessarily re-scanning a file that has not been modified since last being scanned and determined clean. Unnecessary scans are therefore avoided.

A client station on computer network uses an operating system such as JavaOS which is permanently stored at the server rather than on storage media at the client location. JavaOS is loaded and installed at the client upon bootup of the client. The JavaOS is loaded and installed at the client upon bootup of the client. Once the basic system is booted using local firmware, and the base file systems on the network are enabled, an application can begin running, and when it needs to use a particular class file a request will be made through the file system and will be routed over to a generic file system driver, on the client, which will then determine, using a set of configured information, where this class exists; it will utilize the particular file systems available on to that booted client, whether it be NFS, or TFTP, to determine where the server is and how to retrieve that particular class file. It will go ahead and force that operation to occur and the class file will be retrieved and cached locally on the client to be used by the application. In order to avoid loading unneeded or lesser-used parts of the JavaOS from the server to the client memory at boot time, groups of classes are broken out of the monolithic image of JavaOS, as part of the Java service loader model (JSL). JSL-provided packages allow an URL prefix to be provided as part of a package's configuration information. When a class method/data is requested by the loader via the filesystem, if it is not already present, the URL prefix is used to lazily retrieve and cache that file in memory. This allows classes and data files to be delivered as needed, and significantly reduces the amount of data to be retrieved by TFTP by the client at boot time.

A system and method for publishing a file on a network is disclosed. A caching service is disclosed that reduces the load on the publisher's server by publishing that the file is at a fictitious network location. Requests directed to the fictitious location are received by the caching service and the fictitious network location is parsed to determine what file is being requested. If the caching service already has a copy of the file, then the copy is transmitted to the requestor without alerting to the requester that the address is fictitious. If the caching service does not have a copy of the file, then a copy is automatically obtained based on information contained in the fictitious network location.

The invention discloses a spatial data double cache method and a mechanism based on a key value structure, and belongs to the technical field of spatial data storage and management. A double cache mechanism of memory caching and file caching is disclosed by the spatial data double cache method and the mechanism based on the key value structure, the memory caching is first level caching, uses B+tree organizing data, and is written in the file caching by adopting a caching write-back mechanism in an asynchronous mode; the file caching is second level caching, uses large files to be built, and builds caching index based on the B+tree so as to accelerate the speed of searching; and a free space of the file caching uses free space management based on the B+tree to manage. The spatial data double cache method and the mechanism based on the key value structure have the advantages of being free in key value storage mode, fast in searching speed, high in concurrency performance and the like. Storage and visiting efficiency of spatial data caching in network environment are improved, and the spatial data double cache method and the mechanism based on the key value structure can be used for caching of generic spatial data such as remote-sensing images, vector data and dynamic effect model (DEM) in a network geographic information system (GIS).

A method and system for ensuring scanning of suspicious computer files without unnecessary caching of the files on a network device is provided. A network device receives a suspicious computer file and determines whether a target computer is protected by a malware protection program. If the network device determines that the target computer is protected by the malware protection program, the network device modifies the suspicious computer file to make the suspicious computer file unusable by the target computer and sends the modified suspicious computer file to the target computer.

A system and method for improving dynamic memory removals by reducing the file cache size prior to the dynamic memory removal operation initiating are provided. In one exemplary embodiment, the maximum amount of physical memory that can be used to cache files is reduced prior to performing a dynamic memory removal operation. Reducing the maximum amount of physical memory that can be used to cache files causes the page replacement algorithm to aggressively target file pages to bring the size of the file cache below the new maximum limit on the file cache size. This results in more file pages, rather than working storage pages, being paged-out.

A computer file naming technique employs content-specific filenames (CSFN's) that represent globally-unique identifiers for the contents of a file. Since file references incorporating the CSFN's are not location-specific, they offer unique advantages in the areas of file caching and file installation. Particularly, web browsers enabled to recognize CSFN's inherently verify the content of files when they are retrieved from a local cache, eliminating the need for comparison of file data or time stamps of the cached file copy and the server copy. Thus, file verification occurs solely in the local context. The invention includes caching and software installation systems that incorporate the benefits of CSFN's.

The embodiment of the invention discloses a method and a device for setting the file cache time. The method comprises the following steps that: the reference cache time of a file is set; access information of the file is obtained, the access frequency is calculated according to the access information, and the reference cache time is adjusted according to the access frequency obtained after the calculation; and the reference cache time of the file is reset according to the adjusted reference cache time. Through the method and the device for setting the file cache time disclosed by the embodiment of the invention, the dynamic adjustment on the file cache time is realized; cache resources are reasonably allocated; the excessive cache resource occupation caused by too long or too short file cache time is prevented; the number of times of file resource return is reduced; and the bandwidth and server end resources are saved.

The invention discloses a method for caching local temporary files into embedded browser, which comprises the steps: establishing a subdirectory for each webpage which needs to perform temporary file cache in a root directory of the temporary file cache, and saving temporary files only for resources in the webpages in which the subdirectory is established; and traversing the temporary file cache, and if transcripts exist in the resources, only using data in the cache without downloading other data on line. Through the technical scheme of the invention, the method can improve the efficiency of accessing the webpages by the embedded browser.

A system and method for operating a server cluster that includes a set of server devices connected to a local area network (LAN). Each server device maintains a directory of the contents of its file cache. When a decrease in server cluster traffic is detected, a server device on the server cluster is selected for powering down. Prior to powering down a server device, the device's file cache directory is broadcast over the LAN to each of the other server devices on the cluster. If a subsequent request for a file stored in the powered-down server's file cache is received by the cluster, the request is routed to one of the remaining active server devices. This server device then retrieves the requested file from the powered-down server's file cache over the LAN. Prior to broadcasting the file cache directory, pending client requests on the selected server device are completed. The powered-down server may continue to provide power to its NIC and system memory while the processor is deactivated. The server device NIC may include direct memory access capability enabling the NIC to retrieve files from the system memory while the processor is powered-down.

The invention relates to a realization method and a device of a mixed secondary storage system. The realization method comprises the following steps that: step 1: a file is stored in a disk by default; step 2: if the required file is not in a memory, a flash memory is accessed; if the required file is not in the flash memory, the disk is accessed, and the file is obtained; step 3: if the required file is stored in the disk and the access frequency reaches a preset value, and the required file is cached in the flash memory; and step 4: when the size of the file cached in the flash memory reaches a certain value, some files are selected to be written into the disk. Compared with the prior art, the invention can realize a large-capacity and low-power consumption secondary storage system with low cost.

The invention discloses a file sharing method based on a social network. The invention provides a new method for file sharing and distribution among users based on a social network in a D2D communication environment controlled by a base station. In the method, the base station divides the users into multiple temporary groups according to the demands of the users, and judges a central user through the degrees of sociality of the users. In the case of no file cache demand in the system, the base station firstly sends a file to the central user through a wireless cellular communication link, and the central user shares the file to the users having social relations in the groups through D2D communication. The users having no social relations with the central user can acquire the file from the base station or other users who have acquired the file, and thus the file sharing is achieved. In addition, the problem that one D2D user can only process (receive or send) one request at the same time is solved. By adopting the file sharing method disclosed by the invention, the transmission delay is greatly reduced, the load of the base station is relieved, and the overall performance of the cellular communication system is optimized.