tree cd1416b02ae8c9c185a4412d2a2fe0c4f55702a1
parent 160c51cbe51298f50d8783d28d67ddcaf69c96ad
author Matt Spinler <spinler@us.ibm.com> 1580761420 -0600
committer Matt Spinler <spinler@us.ibm.com> 1582225457 +0000

PEL: Use class to watch properties in DataIface

Instead of having the DataInterface class explicitly watch for all of
the PropertiesChanged and InterfacesAdded signals for the D-Bus
properties it needs the values of, create some classes to wrap that
functionality.

The PropertyWatcher class will call a user defined function, passing it
the property value for the path/interface/property specified in the
following cases:
1) On construction, by making a property read method call, if the
   property is on D-Bus then.
2) On a properties changed signal for that property.
3) On an interfaces added signal for that property's interface.

The InterfaceWatcher class will call a user defined function, passing it
the property name/value map for all properties in that interface, in the
following cases:
1) On construction, by making a GetAll property read method call, if the
   interface is on D-Bus then.
2) On a properties changed signal for that interface.
3) On an interfaces added signal for that interface.

Both of these are derived from the DBusWatcher class, and the
DataInterface will store a vector of DBusWatcher pointers after it
creates the instances of the PropertyWatcher or InterfaceWatcher classes
in its constructor.

This commit changes the current properties being watched - the system
model, the system serial number, and the operating system status to this
method.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Iade4ac89a9ce1d46bdebf353350bf161722ced9f