89 lines
2.0 KiB
C++
89 lines
2.0 KiB
C++
#ifndef MBGL_STORAGE_DEFAULT_SHARED_REQUEST_BASE
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#define MBGL_STORAGE_DEFAULT_SHARED_REQUEST_BASE
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#include <mbgl/storage/resource.hpp>
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#include <mbgl/storage/file_cache.hpp>
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#include <mbgl/storage/default_file_source.hpp>
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#include <mbgl/util/util.hpp>
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#include <mbgl/util/noncopyable.hpp>
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#include <string>
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#include <set>
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#include <cassert>
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typedef struct uv_loop_s uv_loop_t;
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namespace mbgl {
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class Request;
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class Response;
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class DefaultFileSource;
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class SharedRequestBase : private util::noncopyable {
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protected:
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MBGL_STORE_THREAD(tid)
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public:
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SharedRequestBase(DefaultFileSource *source_, const Resource &resource_)
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: resource(resource_), source(source_) {}
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virtual void start(uv_loop_t *loop, std::unique_ptr<Response> response = nullptr) = 0;
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virtual void cancel() = 0;
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void notify(std::unique_ptr<Response> response, FileCache::Hint hint) {
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MBGL_VERIFY_THREAD(tid);
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if (source) {
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source->notify(this, observers, std::shared_ptr<const Response>(response.release()),
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hint);
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}
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}
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void subscribe(Request *request) {
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MBGL_VERIFY_THREAD(tid);
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observers.insert(request);
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}
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void unsubscribeAll() {
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MBGL_VERIFY_THREAD(tid);
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source = nullptr;
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observers.clear();
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cancel();
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}
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void unsubscribe(Request *request) {
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MBGL_VERIFY_THREAD(tid);
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observers.erase(request);
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if (observers.empty()) {
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// There are no observers anymore. We are initiating cancelation.
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if (source) {
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// First, remove this SharedRequestBase from the source.
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source->notify(this, observers, nullptr, FileCache::Hint::No);
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}
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// Then, initiate cancelation of this request
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cancel();
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}
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}
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protected:
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virtual ~SharedRequestBase() {
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MBGL_VERIFY_THREAD(tid);
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}
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public:
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const Resource resource;
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private:
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DefaultFileSource *source = nullptr;
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std::set<Request *> observers;
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};
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}
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#endif
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