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#pragma once
#include <mbgl/storage/file_source.hpp>
#include <mbgl/util/pass_types.hpp>
namespace mbgl {
class ResourceOptions;
class JointDatabaseStorage;
/**
* @brief A singleton class responsible for managing file sources.
*
* The FileSourceManager provides following functionality:
*
* - provides access to file sources of a specific type and configuration
* - caches previously created file sources of a (type, configuration) tuples
* - allows to register and unregister file source factories
*/
class FileSourceManager {
public:
using FileSourceFactory = std::function<std::unique_ptr<FileSource>(const ResourceOptions&)>;
/**
* @brief A singleton getter.
*
* @return FileSourceManager*
*/
static FileSourceManager* get() noexcept;
// Returns shared instance of a file source for (type, options) tuple.
// Creates new instance via registered factory if needed. If new instance cannot be
// created, nullptr would be returned.
PassRefPtr<FileSource> getFileSource(FileSourceType, const ResourceOptions&) noexcept;
// Returns shared instance of a joint database storage for the given options.
// Creates new instance, if needed. If new instance cannot be created, nullptr would be returned.
virtual PassRefPtr<JointDatabaseStorage> getDatabaseStorage(const ResourceOptions&) noexcept;
// Registers file source factory for a provided FileSourceType type. If factory for the
// same type was already registered, will unregister previously registered factory.
// Provided factory must not be null.
virtual void registerFileSourceFactory(FileSourceType, FileSourceFactory&&) noexcept;
// Unregisters file source factory. If there are no registered factories for a FileSourceType
// invocation has no effect.
virtual FileSourceFactory unRegisterFileSourceFactory(FileSourceType) noexcept;
protected:
FileSourceManager();
class Impl;
std::unique_ptr<Impl> impl;
virtual ~FileSourceManager();
};
} // namespace mbgl
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