Applications are first class services - users don’t have to specify paths to executables, working directories, etc Examples of what the operations may look like 2. Security, state management, scheduling are all configured optionally 1. Jobs can even run on a Windows box - without a scheduler 3. Different services can exist in the same container - all accessible by separate URLs 4. Clients send command line arguments and input files to services (Base64 binary)
1. Configuration file - metadata (usage, etc), binary location, default arguments, parallel flag. 2. Service properties - globus and scheduler information, database information, mpi location, etc 3. Application writers don’t have to write a single line of code to expose an application as a Web service. Users pass the command line and list of files as arguments
Are the data types of all actor ports known? Are transport protocols known?
Are connected actors type compatible?
Executed per run
Are all the external services (e.g., web services) working?
Replace dead services with live ones…
Are all data in place?
Any updates for local state management?
Polymorphic Actors: Components Working Across Data Types and Domains
Actor Data Polymorphism :
Add numbers (int, float, double, Complex)
Add strings (concatenation)
Add complex types (arrays, records, matrices)
Add user-defined types
Actor Behavioral Polymorphism :
In dataflow , add when all connected inputs have data
In a time-triggered model , add when the clock ticks
In discrete-event , add when any connected input has data, and add in zero time
In process networks , execute an infinite loop in a thread that blocks when reading empty inputs
In CSP , execute an infinite loop that performs rendezvous on input or output
In push/pull , ports are push or pull (declared or inferred) and behave accordingly
In real-time CORBA* , priorities are associated with ports and a dispatcher determines when to add
By not choosing among these when defining the component, we get a huge increment in component re-usability. But how do we ensure that the component will work in all these circumstances? Source: Edward Lee et al. http://ptolemy.eecs.berkeley.edu/