ui: split steps of indexing files and saving the last few batches of data

* implemented showing dialog for database injection
* implemented easy-to-read way of creating behavior tree structures
* moved injector wait logic out of injection task

src/lib/utility/scheduling/TaskGroupSelector.cpp

@@ -0,0 +1,56 @@
+#include "utility/scheduling/TaskGroupSelector.h"
+
+TaskGroupSelector::TaskGroupSelector()
+{
+}
+
+TaskGroupSelector::~TaskGroupSelector()
+{
+}
+
+void TaskGroupSelector::addTask(std::shared_ptr<Task> task)
+{
+	m_taskRunners.push_back(std::make_shared<TaskRunner>(task));
+}
+
+void TaskGroupSelector::doEnter(std::shared_ptr<Blackboard> blackboard)
+{
+	m_taskIndex = 0;
+}
+
+Task::TaskState TaskGroupSelector::doUpdate(std::shared_ptr<Blackboard> blackboard)
+{
+	if (m_taskIndex >= int(m_taskRunners.size()))
+	{
+		return STATE_FAILURE;
+	}
+	else if (m_taskIndex < 0)
+	{
+		return STATE_SUCCESS;
+	}
+
+	TaskState state = m_taskRunners[m_taskIndex]->update(blackboard);
+
+	if (state == STATE_FAILURE)
+	{
+		m_taskIndex++;
+	}
+	else if (state == STATE_SUCCESS)
+	{
+		m_taskIndex = -1;
+	}
+
+	return STATE_RUNNING;
+}
+
+void TaskGroupSelector::doExit(std::shared_ptr<Blackboard> blackboard)
+{
+}
+
+void TaskGroupSelector::doReset(std::shared_ptr<Blackboard> blackboard)
+{
+	for (size_t i = 0; i < m_taskRunners.size(); i++)
+	{
+		m_taskRunners[i]->reset();
+	}
+}