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