Cache strategy |
With the development of cache in SuperMap GIS series products, SuperMap server product provides all- around support in cache. It supports HTTP Cache, Request Cache covering all service types, and provides tiles of raster, vector and attributes for map services.
Generally speaking, the map cache refers to map tiles. From the product 7C, besides the map tiles, the map cache also includes vector tiles and attribute tiles.
SuperMap iServer support to enable HTTP Cache.
HTTP Cache saves the results of different requests to memory to implement caching. You can select whether to enable/disable HTTP Cache according to the demand. After enabling HTTP Cache, the result will be cached automatically. When client sends the same request, the server will return this cached result to improve responding speed.
SuperMap iServer enables HTTP Cache by default. Cache life cycle is 1 minute. When there are no same request in one minute, the cached result will be invalidated automatically. REST map services and REST 3D services supports the HTTP Cache.
Request Cache means the server saving the response result of the request from the client to local. When the server receives the same request later, it only directly return the cached result . Here the response result can be map tile, analysis result, 3D model, etc. Request Cache supports all-around REST services, such as map, data, analysis, and 3D, etc.
Table 1 Services and resources which support Request Cache
| Remote REST service | Resources which support Request Cache | |
| REST map service | entireImage, image, overview, symbol, tileImage | |
| REST data service | features feature statistic Notes: only support the query operations and the getting operation of features. |
|
| REST spatial analysis service | The BufferAnalyst resource | datasetBufferResults, datasetBufferResult, geometryBufferResults, geometryBufferResult |
| The OverlayAnalyst resource | datasetOverlayResults, datasetOverlayResult, geometryOverlayResults, geometryOverlayResult | |
| The resource for extracting isoline | datasetIsolineResults, datasetIsolineResult, geometryIsolineResult, geometryIsoregionResults | |
| The resource for extracting isoregion | datasetIsoregionResults, datasetIsoregionResult, geometryIsoregionResults, geometryIsoregionResult | |
| The interpolation analysis resource | datasetInterpolation, datasetThiessenResults, datasetThiessenResult, interpolationIDW, interpolationIDWResult, interpolationDensity, interpolationDensityResult, interpolationRBF, interpolationRBFResult, interpolationKriging, interpolationKrigingResult |
|
| The Linear Reference resource | datasetLinearReferencing, generateSpatialData, spatialDataResult | |
| The analysis result set of space relations | datasetGeorelationResults, datasetGeorelationResult | |
| The result set resource of dataset proximity analysis | datasetGeorelationResults, datasetGeorelationResult, geometryThiessennResults, geometryThiessennResult | |
| REST transportation analysis service | TSPPaths, serviceAreas, MTSPPaths, location, closestfacilities, paths | |
| REST traffic transfer service | transferSolutions, transferPath, transferStops, stopListByKeyword | |
| REST 3D service | datas, data, modelIndex, config, dataversion, tiledata | |
The map cache is mainly created by Distributed Tiling service. This function supports to split the map data into many formats and tiles, such as FastDFS, MongoDB, SMTiles, UGCV5 map tiles, SVTiles vector tiles, and UTFGrid attribute tiles.
Split and store all layers in map as raster map tiles, supporting FastDFS and MongoDB distributed storage, SMTiles and MBTiles and SuperMap UGC formats.
SuperMap UGC is a general and traditional tile format in SuperMap products. The map tiles with same version can be used. Distributed tile service supports the "UGCV5" tiles, which means the 5.0 original caches.
Split and store the vector layers in maps in the format of vector tiles, supporting SVTiles format.
Store the attribute data of vector layers in maps in the format of attribute tiles, supporting UTFGrid format.
Please refer to Map cache format for more information.