prepare for selectable backends

backend.cpp

@@ -0,0 +1,65 @@
+#include "backend.h"
+
+AiBackend::Request::Request(const QString& textIn, void* userPtrIn):
+text(textIn),
+userPtr(userPtrIn)
+{
+	id = idCounter++;
+}
+
+const QString& AiBackend::Request::getText() const
+{
+	return text;
+}
+
+uint32_t AiBackend::Request::getId() const
+{
+	return id;
+}
+
+void* AiBackend::Request::getUserPtr() const
+{
+	return userPtr;
+}
+
+bool AiBackend::Request::operator==(const Request& in)
+{
+	return id == in.id;
+}
+
+AiBackend::Response::Response(QString textIn, uint32_t idIn, bool finishedIn, void* userPtrIn):
+AiBackend::Request::Request(textIn, userPtrIn),
+finished(finishedIn)
+{
+	id = idIn;
+}
+
+bool AiBackend::Response::isFinished() const
+{
+	return finished;
+}
+
+void AiBackend::Response::setUserPtr(void* ptr)
+{
+	userPtr = ptr;
+}
+
+void AiBackend::generate(const Request& request)
+{
+	m_requests.insert(request.getId(), request);
+	generateImpl(request);
+}
+
+bool AiBackend::isValidId(uint32_t id)
+{
+	return m_requests.find(id) != m_requests.end();
+}
+
+void AiBackend::feedResponse(Response response)
+{
+	response.setUserPtr(m_requests[response.getId()].getUserPtr());
+	if(response.isFinished())
+		m_requests.remove(response.getId());
+
+	gotResponse(response);
+}