1 files changed, 61 insertions, 0 deletions
diff --git a/lib/base/loader.hpp b/lib/base/loader.hpp
new file mode 100644
index 0000000..f1c7759
--- /dev/null
+++ b/lib/base/loader.hpp
@@ -0,0 +1,61 @@
+/* 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 */