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When inserting an cached resource, or removing a region, remove least-recently used resources and tiles, not used by offline regions, until the used database size, as calculated by multiplying the number of in-use pages by the page size, is less than the maximum cache size minus 5 times the page size. In addition, OfflineDatabase may be configured to ignore cache puts of individual resources larger than a certain size. This policy is similar but not identical to the former SQLiteCache policy: * It accounts for offline, by exempting resources required by offline regions from eviction. * It must delete from two tables (resources and tiles), rather than one. Currently the strategy is naive: evict 50 rows at a time from each table. * It makes maximumCacheSize and maximumCacheEntrySize completely independent. The SQLiteCache implementation evicted when `usedSize > maximumCacheSize - 2 * maximumCacheEntrySize`. This evicts when `usedSize > maximumCacheSize - 5 * pageSize`. * It uses a non-unlimited default value for maximumCacheSize: 50 MB. We should have always had a limit in place; "a cache without an eviction policy is a resource leak".
Mapbox GL Native
A library for embedding interactive, customizable vector maps into native applications on multiple platforms. It takes stylesheets that conform to the Mapbox GL Style Specification, applies them to vector tiles that conform to the Mapbox Vector Tile Specification, and renders them using OpenGL. Mapbox GL JS is the WebGL-based counterpart, designed for use on the Web.
The Mapbox GL ecosystem
This repository hosts the cross-platform Mapbox GL Native library, plus convenient SDKs for several platforms. The cross-platform library comes with a GLFW-based demo application for Ubuntu Linux and OS X. The SDKs target the usual languages on their respective platforms:
| SDK | Languages | Build status |
|---|---|---|
| Mapbox GL Native | C++14 |  |
| Mapbox Android SDK | Java |  |
| Mapbox iOS SDK | Objective-C or Swift |  |
| Mapbox OS X SDK | Objective-C or Swift |  |
| node-mapbox-gl-native | Node.js | |
Additional Mapbox GL Native–based libraries are developed outside of this repository:
- React Native Mapbox GL for React Native applications on iOS and Android
- QMapboxGL for Qt-based applications
- Telerik’s Mapbox plugin for Apache Cordova Hybrid applications
- Telerik’s Mapbox plugin for NativeScript Hybrid applications
- Xamarin's Mapbox component for Xamarin Hybrid applications
If your platform or hybrid application framework isn’t listed here, consider embedding Mapbox GL JS using the standard Web capabilities on your platform.