e49c1e3da3
The core of the change is ensuring that ensureResource doesn't release Zalgo: it should be consistently async, rather than async in the case that the resource doesn't exist in the database, but sync if it does. This ensures that status is reported in a more consistent sequence, regardless of the database state.
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
#pragma once
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#include <mbgl/storage/offline.hpp>
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#include <mbgl/style/types.hpp>
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#include <list>
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#include <set>
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#include <memory>
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namespace mbgl {
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class OfflineDatabase;
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class FileSource;
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class WorkRequest;
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class FileRequest;
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class Resource;
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class Response;
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class SourceInfo;
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class StyleParser;
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class Source;
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/**
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* Coordinates the request and storage of all resources for an offline region.
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* @private
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*/
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class OfflineDownload {
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public:
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OfflineDownload(int64_t id, OfflineRegionDefinition&&, OfflineDatabase& offline, FileSource& online);
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~OfflineDownload();
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void setObserver(std::unique_ptr<OfflineRegionObserver>);
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void setState(OfflineRegionDownloadState);
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OfflineRegionStatus getStatus() const;
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private:
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void activateDownload();
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void deactivateDownload();
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std::vector<Resource> spriteResources(const StyleParser&) const;
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std::vector<Resource> glyphResources(const StyleParser&) const;
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std::vector<Resource> tileResources(SourceType, uint16_t, const SourceInfo&) const;
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/*
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* Ensure that the resource is stored in the database, requesting it if necessary.
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* While the request is in progress, it is recorded in `requests`. If the download
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* is deactivated, all in progress requests are cancelled.
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*/
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void ensureResource(const Resource&, std::function<void (Response)> = {});
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void ensureTiles(SourceType, uint16_t, const SourceInfo&);
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int64_t id;
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OfflineRegionDefinition definition;
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OfflineDatabase& offlineDatabase;
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FileSource& onlineFileSource;
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OfflineRegionStatus status;
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std::unique_ptr<OfflineRegionObserver> observer;
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std::list<std::unique_ptr<WorkRequest>> workRequests;
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std::list<std::unique_ptr<FileRequest>> fileRequests;
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std::set<std::string> requiredSourceURLs;
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};
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} // namespace mbgl
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