Because I have not got any response from the last post, I post again, for
hopefully someone can answer me. Forget about what I said in the first
post, it was embarrassing.
The community would probably benefit if we extend (node.js) domain module
to support polymorphism. It should not require much work (only a simple
wrapper around the current domain, like I have done private) and it is
fully possible. See previous example too get a point on what I mean.
The simple domain.on('error', ...) is not enough. This comes from why
throw/catch was first invented, to skip all error handling and unwind the
stack until it can be handled. The domain module should probably do the
same, and if the error is not handled, show some nice error message:
//pseudo domain
domain.addErrorListener(Error, function(err, next) {
//will only be invoked by instances of Error
console.log("domain caught");
next(); //would generate a nice error message and stop the process, if no
more error listener is found.
});
domain.run(function() {
//this is just used here to show how great it could be receive the
closest domain (domain)
var foo = this.create();
foo.addErrorListener([EvalError, SyntaxError, ReferenceError,TypeError],
function(err, next) {
//will only be invoked by instances of EvalError, SyntaxError,
ReferenceError and TypeError
//An empty array or [[]] should be used for listen for array objects
console.log("foo caught ");
next();
});
foo.run(function() {
setTimeout(function() {
noneExistentFunction(); //stimulate asynchronous operation
} 1000);
});
});
SHOULD OUTPUT:
foo caught
domain caught
Like you can see, next should be equivalent too re-throw an exception
within a try statement. Please someone in the dev team answer me now. is
this not a very good feature to have? The regular domain.on('error') can
stay the same, just add the functionality to support polymorphism like I
showed above. I can upload the code I personally use, it is small, however
I don't use the method add and dispose, so they does not exist.
Thank in advance!
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