Hello,
I'm writting a decorator pattern for a protocol in Thrift that's based
on c_glib. One of the cases I found is that you can have this:
// From Thrift code:
/*!
* Thrift Protocol Decorator instance.
*/
struct _ThriftProtocolDecorator
{
ThriftProtocol parent;
ThriftProtocol *concrete_protocol;
};
typedef struct _ThriftProtocolDecoratorClass ThriftProtocolDecoratorClass;
That's a class that implements an interface but when a method is called,
it really calls the concrete_protocol method. That's nice. It works but
when dealing with properties that's a new history.
For example you can decorate a concrete_protocol that has a property
called "transport" but when the code does something like:
g_object_get(decorated_protocol, "transport", &transportvar, NULL);
glib will search over the decorator class installed properties that's
not what I want. I resolved hacking a known property install and trying
to find its values on
concrete_protocol.
Something like this:
In the init class
// TODO Ugly hack, in theory we must override all properties from
underlaying
// protocol
thrift_stored_message_protocol_obj_properties[PROP_THRIFT_STORED_MESSAGE_PROTOCOL_TRANSPORT]
=
g_param_spec_pointer ("transport",
"Transport on the underlaying implementation",
"Transport of decorated protocol",
G_PARAM_READABLE);
In the getter function
case PROP_THRIFT_STORED_MESSAGE_PROTOCOL_TRANSPORT:
// FIXME Since we don't override properties in the decorator as
it should
// we just override the properties that we know are used
g_object_get(decorator->concrete_protocol,pspec->name, &transport, NULL);
g_value_set_pointer (value, transport);
break;
But it will fail if it asks for other property of the concrete_protocol
instance. So the question is:
Is there any way to install all properties installed on the
concrete_protocol? So I can override the "Getter" and "Setter" and
fordward the request to the decorated instance?
Best regards,
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