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uf:guanotes [2009/02/11 18:01] elisag |
uf:guanotes [2009/11/18 15:11] elisag |
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Another idea is that flockrs can stop the percolation of guanotes. For example, if a flockr detects that a spam guanote or a guanote with unapropiate content, it could stop its propagation. | Another idea is that flockrs can stop the percolation of guanotes. For example, if a flockr detects that a spam guanote or a guanote with unapropiate content, it could stop its propagation. | ||
- | ==== Design | + | ==== What is a guanote? |
- | To implement | + | A guanote consists of a message and a receiver list (a flock or individual flockrs). |
+ | In order to avoid flooding the network, TOTAM ensures that only flockrs belonging to the receiver list are used as //routers// (so that only potential targeted flockrs carry guanotes). | ||
- | The idea is to build a framework similar to TOTA, called AmbientTOTA, | + | A guanote can be sent to a flock or an explicit collection of flockrs. In the later case end users can enumerate the targeted flockrs |
- | AmbientTota has been designed to be independent from service discovery. So, Guanotes will also have to implement some glue codeto plug in the discovery mechanism of Urbiflock (via Flockr). | + | ==== Usage Scenario ==== |
- | ==== API ==== | + | {{: |
- | Here comes the public interface to interact | + | The above figure illustrates |
- | < | ||
- | makeTupleSpace() | ||
- | makeTuple(tupleID) | ||
- | extendTuple: | ||
- | </ | ||
- | A tuple space (ts) in AmbientTota basically consists of a local ts, an ambient ts (to inject tuples in the ambient). The public interface of an ts is the following: | ||
- | |||
- | < | ||
- | // tota operations to manage a local ts | ||
- | def add(tuple) | ||
- | def delete(template) -> vector with the deleted tuples | ||
- | matching the template | ||
- | def read(template) -> vector with the matching tuples | ||
- | |||
- | //publishes a tuple into the ambient ( ~ inject in TOTA) | ||
- | def inject(tuple) -> subscription object to cancel the injection | ||
- | |||
- | // places a listener on to the local TS ( ~ subscribe in TOTA) | ||
- | // it returns a publication object to be able to unsusbscribe | ||
- | when: template matches:{ | tuple | | ||
- | // code | ||
- | } | ||
- | //Templates are currently boolean expressions on tuples. | ||
- | Example of template applied to guanotes: | ||
- | { |guanote| | ||
- | |||
- | //methods belonging to the propagation protocol | ||
- | |||
- | // notifies the discovery of a remote ts | ||
- | // and starts the propagation protocol (send side) | ||
- | def notifyTSDiscovered(ts) | ||
- | // notifies the arrival of tuples from a ts | ||
- | // receive side of the propagation protocol | ||
- | def receiveTyples(tuples) | ||
- | </ | ||
- | |||
- | A tuple in our system is just the object contained in a local TS offering the following API to propagate itself: | ||
- | |||
- | < | ||
- | // called in every tuple at pass() | ||
- | def decidePropagation() -> boolean | ||
- | // specifies operations on the local TS | ||
- | def doAction (); | ||
- | // specifies operations on the tuple itself | ||
- | def changeTupleContent() -> tuple | ||
- | // if true -> note gets added to local TS | ||
- | def decideStore () -> boolean | ||
- | // if true -> tuple gets unexported and deleted from local TS. | ||
- | //new operation not in TOTA | ||
- | def decideDie() -> boolean | ||
- | </ | ||
- | |||
- | decideDie() is there for discontinuous decidePropagation functions. for example, tuples that should be only propagated every Tuesday could not implemented with TOTA because the propagation protocol only gets called once. We change this by providing decideDie() that gets called when you decide not to propagate. Like this a tuple can still be propagate at a later point in time, despite the fact that the decidePropagation function has evaluated to false at a certain moment. |