116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
#ifndef MBGL_STORAGE_DEFAULT_DEFAULT_FILE_SOURCE_IMPL
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#define MBGL_STORAGE_DEFAULT_DEFAULT_FILE_SOURCE_IMPL
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#include <mbgl/storage/default_file_source.hpp>
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#include <mbgl/storage/asset_context_base.hpp>
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#include <mbgl/storage/http_context_base.hpp>
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#include <mbgl/util/async_task.hpp>
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#include <mbgl/util/noncopyable.hpp>
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#include <mbgl/util/chrono.hpp>
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#include <mbgl/util/timer.hpp>
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#include <set>
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#include <unordered_map>
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namespace mbgl {
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class RequestBase;
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class DefaultFileRequest : public FileRequest {
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public:
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DefaultFileRequest(const Resource& resource_,
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DefaultFileSource& fileSource_)
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: resource(resource_),
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fileSource(fileSource_) {
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}
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~DefaultFileRequest() {
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fileSource.cancel(resource, this);
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}
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Resource resource;
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DefaultFileSource& fileSource;
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std::unique_ptr<WorkRequest> workRequest;
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};
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class DefaultFileRequestImpl : public util::noncopyable {
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public:
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using Callback = std::function<void (Response)>;
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const Resource resource;
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std::unique_ptr<WorkRequest> cacheRequest;
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RequestBase* realRequest = nullptr;
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std::unique_ptr<util::Timer> timerRequest;
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inline DefaultFileRequestImpl(const Resource& resource_)
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: resource(resource_) {}
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~DefaultFileRequestImpl();
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// Observer accessors.
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void addObserver(FileRequest*, Callback);
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void removeObserver(FileRequest*);
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bool hasObservers() const;
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// Updates/gets the response of this request object.
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void setResponse(const std::shared_ptr<const Response>&);
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const std::shared_ptr<const Response>& getResponse() const;
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// Returns the seconds we have to wait until we need to redo this request. A value of 0
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// means that we need to redo it immediately, and a negative value means that we're not setting
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// a timeout at all.
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Seconds getRetryTimeout() const;
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// Checks the currently stored response and replaces it with an idential one, except with the
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// stale flag set, if the response is expired.
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void checkResponseFreshness();
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// Notifies all observers.
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void notify();
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private:
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// Stores a set of all observing Request objects.
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std::unordered_map<FileRequest*, Callback> observers;
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// The current response data. We're storing it because we can satisfy requests for the same
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// resource directly by returning this response object. We also need it to create conditional
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// HTTP requests, and to check whether new responses we got changed any data.
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std::shared_ptr<const Response> response;
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// Counts the number of subsequent failed requests. We're using this value for exponential
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// backoff when retrying requests.
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int failedRequests = 0;
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};
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class DefaultFileSource::Impl {
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public:
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using Callback = std::function<void (Response)>;
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Impl(FileCache*, const std::string& = "");
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~Impl();
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void networkIsReachableAgain();
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void add(Resource, FileRequest*, Callback);
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void cancel(Resource, FileRequest*);
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private:
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void update(DefaultFileRequestImpl&);
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void startCacheRequest(DefaultFileRequestImpl&);
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void startRealRequest(DefaultFileRequestImpl&);
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void reschedule(DefaultFileRequestImpl&);
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std::unordered_map<Resource, std::unique_ptr<DefaultFileRequestImpl>, Resource::Hash> pending;
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FileCache* const cache;
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const std::string assetRoot;
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const std::unique_ptr<AssetContextBase> assetContext;
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const std::unique_ptr<HTTPContextBase> httpContext;
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util::AsyncTask reachability;
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};
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}
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#endif
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