Introducing the BufferCache announced on the mailing list, and some small changes. L4Sys is still WIP.

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1316 8c4709b5-6ec9-48aa-a5cd-a96041d1645a

core/controller/BufferCache.cc

@@ -0,0 +1,74 @@
+#include "BufferCache.hpp"
+#include "Event.hpp"
+
+namespace fi {
+
+template<class T> int BufferCache<T>::add(T val) {
+	size_t new_size = get_count() + 1;
+	size_t new_last_index = get_count();
+
+	int res = reallocate_buffer(new_size);
+	if (res == 0) {
+		set(new_last_index, val);
+	}
+
+	return res;
+}
+
+template<class T> int BufferCache<T>::remove(T val) {
+	bool do_remove = false;
+	for (size_t i = 0; i < get_count(); i++) {
+		if (get(i) == val) {
+			do_remove = true;
+		}
+		if (do_remove) {
+			if (i > get_count() - 1) {
+				set(i, get(i + 1));
+			}
+		}
+	}
+
+	int res = 0;
+	if (do_remove) {
+		size_t new_size = get_count() - 1;
+		res = reallocate_buffer(new_size);
+	}
+
+	return res;
+}
+
+template<class T> void BufferCache<T>::clear() {
+	set_count(0);
+	free(m_Buffer);
+	m_Buffer = NULL;
+}
+
+template<class T> int BufferCache<T>::erase(int idx) {
+	for (size_t i = idx; i < get_count() - 1; i++) {
+		set(i, get(i + 1));
+	}
+
+	size_t new_size = get_count() - 1;
+	if (reallocate_buffer(new_size) != 0)
+		return -1;
+	return idx;
+}
+
+template<class T> int BufferCache<T>::reallocate_buffer(size_t new_size) {
+	if (new_size == 0) {
+		clear();
+		return 0;
+	}
+	void *new_buffer = realloc(m_Buffer, new_size * sizeof(T));
+	if (new_buffer == NULL)
+		return 10;
+	m_Buffer = static_cast<T*>(new_buffer);
+	set_count(new_size);
+	return 0;
+}
+
+//declare whatever instances of the template
+//you are going to use here:
+template class BufferCache<BPEvent*>;
+
+} /* namespace fi */