author: Gerald Dherbomez 
copyright: Heudiasyc UMR UTC/CNRS 7253 

Exercise 2: Managing the communication of components together
-------------------------------------------------------------


Exercise 2.1: communication between components
----------------------------------------------

In this exercise we will develop a new component with one input and one output. The component should add a specific number defined as a parameter to the input value and provide the result as output. Before sending the result on the output it must wait for 1 second. The component will print to the terminal the result of the addition too.

Write the code of this component in a new plugin but use the same pacpus project as the exercise 1. Build and install the plugin in the PACPUS_ROOT/bin folder and execute the plugin with the PacpusSensor application.

Indication:
- Now, the tree of your project may be something like that: 

pacpustutorials
   |
   |--> exercises
           |
           |--> exercise_1
                    |
                    |--> CMakeLists.txt
                    |--> MessageComponent.h
                    |--> MessageComponent.cpp
           |
           |--> exercise_2
                    |
                    |--> CMakeLists.txt
                    |--> AdditionComponent.h
                    |--> AdditionComponent.cpp
           |
           |--> build
                    |
                    |--> build_linux.sh
           |
           |--> CMakeLists.txt



Exercise 2.2: communication of variable size data
-----------------------------------------------
Create a new component in the same plugin as the previous one (exercise 2.1). It will have the same functionnality with the difference that it can do an addition on a vector of input values.

Build, install and run this new component.

Indication :
- you can use the QVector class as input/output type.



Exercise 2.3: Threaded component
--------------------------------
From the component written in exercise 2.2 create a new component with the same interface. The addition must be done in a separate thread.

Build, install and run this new component.

Indication :
- Your component must inherit from the QThread class.
- Take care of the protection of the data to guarantee a thread safe execution.