dynobject

Kind of dynamic Objects for rust. Allowing to create, change and access typed properties with runtime type checks

Note: Rust has perfectly fine mechanismen to do mostly everything without refering to such a roundabout crates like dynobject

The DynObject is a dynamic Object witch has interiour mutablility and reference counting allowing it easly to be shared betwenn ownership boundaries (but not threads!). When acccessing properties it is ensured that no objects are destructed per default when a operation fails (expect DynProperty::destruct). This nevertheless means that you will have to handle many results. But there are some nice result levering macros like try! to keep you code cleaner.

The dokumentation is done over the rustdoc tool, seadly I havent integrated it yet into github so you need to run rustdoc yourself or look into the source files.

Examples

extern crate dynobject;

use dynobject::DynObject;

//for simplicity use &'static str
type Key = &'static str;

//with intorior mutablility
//if you do not want this just change
//`fn run(&self)...` to `fn run(&mut self)...`
struct Processor {
	shared_data: DynObject<Key>,
	//there are will soon be unboxed closures witch could be used here insted of Box<Fn...>
	runner: Box<Fn(&DynObject<Key>) -> bool>
}

impl Processor {
	fn run(&self) -> bool {
		(self.runner)(&self.shared_data)
	}
}

fn run_to_end(pr: &Processor) {
	while pr.run() { 
		println!("running");
	}
}

fn setup_data(outer_obj: &DynObject<Key>) {
	#![allow(unused_must_use)]
	let mut obj = outer_obj.aquire();
	obj.create_property("counter1", Box::new(0u32));
	obj.create_property("counter2", Box::new(1u32));
	obj.create_property("limit", Box::new(4u32));
}

fn main() {
	let obj = DynObject::<Key>::new();
	setup_data( &obj );
	let p1 = Processor {
		shared_data: obj.clone(),
		runner: Box::new( |data: &DynObject<Key>| -> bool {
			let mut obj = data.aquire();
			let value = *obj["counter1"].as_ref::<u32>().unwrap() + 1;
			*obj["counter1"].as_mut::<u32>().unwrap() = value;
			println!("reached {}", value);
			obj["limit"].as_ref::<u32>().unwrap() >= &value
		} )
	};
	let p2 = Processor {
		shared_data: obj.clone(),
		runner: Box::new( |data: &DynObject<Key>| -> bool {
			let mut obj = data.aquire();
			*obj["counter2"].as_mut::<u32>().unwrap() += 2;
            let ref_2_counter1 = obj["counter1"].as_mut::<u32>().unwrap();
            *ref_2_counter1 -= 1;
            *ref_2_counter1 > 0 
		} )
	};
	
	run_to_end( &p1 );
	run_to_end( &p2 );

    let accessor = obj.aquire();
    let c1 = accessor["counter1"].as_ref::<u32>().unwrap();
    let c2 = accessor["counter2"].as_ref::<u32>().unwrap();
    let limit = accessor["limit"].as_ref::<u32>().unwrap();
	println!( "c1: {}, c2: {}, limit: {}", c1, c2, limit );
}	

Calling Guards

There is a calling guard branch witch extends the Object by Funktion/Closure based Guards witch are called on create, remove, access(mut), access(ref) operatons and let the fail. This is usefull for logging purpose and some other stuff. Neverless due too the limitations of the current design thes will not be merged with the main branch (even throug a programm compatible with the mainbranch should be compatible with the calling-guard branch too, due too the same method signatures).

License

Apache v2