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/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
#ifndef LOADER_H
#define LOADER_H
#include "base/i2-base.hpp"
#include "base/initialize.hpp"
#include "base/string.hpp"
#include <boost/thread/tss.hpp>
#include <queue>
namespace icinga
{
struct DeferredInitializer
{
public:
DeferredInitializer(std::function<void ()> callback, InitializePriority priority)
: m_Callback(std::move(callback)), m_Priority(priority)
{ }
bool operator>(const DeferredInitializer& other) const
{
return m_Priority > other.m_Priority;
}
void operator()()
{
m_Callback();
}
private:
std::function<void ()> m_Callback;
InitializePriority m_Priority;
};
/**
* Loader helper functions.
*
* @ingroup base
*/
class Loader
{
public:
static void AddDeferredInitializer(const std::function<void ()>& callback, InitializePriority priority = InitializePriority::Default);
static void ExecuteDeferredInitializers();
private:
Loader();
// Deferred initializers are run in the order of the definition of their enum values.
// Therefore, initializers that should be run first have lower enum values and
// the order of the std::priority_queue has to be reversed using std::greater.
using DeferredInitializerPriorityQueue = std::priority_queue<DeferredInitializer, std::vector<DeferredInitializer>, std::greater<>>;
static boost::thread_specific_ptr<DeferredInitializerPriorityQueue>& GetDeferredInitializers();
};
}
#endif /* LOADER_H */
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