rework message hierarchy

Rework message hierarchy with the final objective
of splitting libqtappfw into several libraries.
This commit carries the following changes:
- Simplify message hierarchy, keeping abstract
Message class, adding specialization for call and
event messages, keeping ResponseMessage, and
removing all module specific specializations.
- Add MessageFactory class to create message
objects.
- Change messages life cycle: using smart pointers
and removing QObject from message hierarchy (a
Message is not a QObject anymore and thus
'deleteLater()' is not available).
- Adapt all modules to use new message hierarchy.
- Keep ResponseMessage original constructor to
avoid breaking TaskManager.
- Message constructors have been kept public, but
will go private on a follow-up patch (once
TaskManager class has been modified to use new
MessageFactory).

Bug-AGL: SPEC-3112
Signed-off-by: Raquel Medina <raquel.medina@konsulko.com>
Change-Id: I3a7a6325209ddeca2293f1ac745371861a947bfb

1 files changed, 42 insertions, 0 deletions

diff --git a/messagefactory.h b/messagefactory.h
new file mode 100644
index 0000000..f826483
--- /dev/null
+++ b/messagefactory.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2020 Konsulko Group
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MESSAGEFACTORY_H
+#define MESSAGEFACTORY_H
+
+#include <memory>
+#include <QJsonDocument>
+
+class Message;
+enum class MessageId;
+
+class MessageFactory {
+	public:
+		static MessageFactory& getInstance() {
+			static MessageFactory instance;
+			return instance;
+		}
+		std::unique_ptr<Message> createInboundMessage(MessageId id, QJsonDocument content);
+		std::unique_ptr<Message> createOutboundMessage(MessageId);
+		MessageFactory(MessageFactory const&) = delete;
+		void operator=(MessageFactory const&) = delete;
+
+	private:
+		MessageFactory() = default;
+		~MessageFactory() = default;
+};
+
+#endif // MESSAGEFACTORY_H