emitter | event listeners for bash | Pub Sub library
kandi X-RAY | emitter Summary
kandi X-RAY | emitter Summary
Emitter is a bash library that helps you to be able to create custom event listeners and assign a function to be executed whenever the listener is been emitted. Usage event takes three subcommands which are attach emit and detach. event attach event attach takes two argument which is the name of the event you want to listen for and the function to execute when the event is emitted. event emit event emit the first argument to event emit must be the the event you want to listen for and it must have already been added to the stack with event attach , the second argument must be the list of all the argument which will be passed to the callback function (behind the hood) assigned to the event you want to listen for. Note:- You must not pass the arguments to the callback function directly when createing the event listener with event attach. Note:- When assigning the arguments to the event listener using event emit you must wrap the arguments with double quotes , each argument must be separated with a single space, if a single argument have spaces or tabs , wrap that specific argument with single quotes. Note:- Under the hood, 2 other argument are passed to the callback function which is the name of the event listend for and the function that will be fired if the event is emitted. see line 7 and line 27. once event once works like event emit. The only difference is that once an event is emitted in event once that event is removed as an event listener i.e it is only executed ones. NOTE: once the event addNumber is emitted trying to emit again will cause an error. removeall listener event removeAll This subcommands removes all listener by unsetting the Stack array. List Event event list takes no argument. It lists the total number of event listener in the Stack. setmaxlistener event setMaxlistener takes one argument which must be an integer. It resets the default maximum listener by the specified ones. Detach Event event detach takes a single argument, it detaches/removes the event you don't want to listen for again from the Stack. maxlisteners The total number of listeners allowed is 1000, and it's readonly, you cannot modify it in your script, except you want to modify it directly from the emitter library. License GNU General Public License.
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Copyfunction O(e,t,n,r){e.detachEvent&&!isOpera?r&&e.detachEvent(r,t):e.removeEventListener(n,t,!1)} Community Discussions
Trending Discussions on emitter
QUESTION
MutableSharedFlow takes 3 parameters: replay, extraBufferCapacity and onBufferOverflow. What is the difference between replay and extraBufferCapacity?
The documentation mentions the following:
replay - the number of values replayed to new subscribers (cannot be negative, defaults to zero).
extraBufferCapacity - the number of values buffered in addition to replay. emit does not suspend while there is a buffer space remaining (optional, cannot be negative, defaults to zero).
I don't understand exactly the difference between the 2 and when we would need extraBufferCapacity > 0. Is extraBufferCapacity just an additional replay capacity for emitters?
...ANSWER
Answered 2022-Apr-05 at 09:31Is extraBufferCapacity just an additional replay capacity for emitters?
The "replay" terminology only really makes sense for subscribers, not emitters. The replay parameter defines how many past values new subscribers will receive upon subscribing. It obviously implies that those values need to be stored, so the overall buffer needs to be at least this big.
However, the buffer size (as a whole) impacts emitters. The exact consequence of a full buffer depends on onBufferOverflow, but this buffer size can be used to control backpressure on emitters (slowing them down) or how we drop messages. With a larger buffer, you can allow emitters to have bursts of emissions without slowing them down, like any regular buffer.
Now, choosing to have a larger buffer shouldn't force you to replay those buffered values to new subscribers, hence the extraBufferCapacity. With extraBufferCapacity > 0, you can define a buffer of any desired size without also forcing you to replay as many values, simply by using the formula:
QUESTION
I have created a custom async emitter to have a server -> client -> server method.
However, it doesn't work as expected. It emits the event, but does not run the callback.
With Socket.IO debugging enabled, I can see that the socket.io:socket is logging that it is emitting the correct event.
Function code:
...ANSWER
Answered 2022-Mar-21 at 15:06Callbacks with Socket.io are different and are generally referred to as acknowledgement functions
In order to implement callbacks, the sender would need to add the function to the last parameter of the socket.emit() call.
Example:
Sender
QUESTION
I have this Swift class, the function emitLogEvent calls RCTEventEmitter sendEvent which is being listened for in React Native. If I call this function directly from React, the sendEvent works and I can log out count from React Native.
...ANSWER
Answered 2022-Mar-15 at 00:35I found the solution here
This issue with this is:
QUESTION
Let's say we have an emitter object implementing some logic and another different type object that implements some other logic depending on the events triggered by the emitter object. I guess, we can simply solve this by using function[pointer]s in the emitter and change their target by using a function that adds listener functions of the listener object like the code in the following. Even we can remove it. Like the DOM events, I can say.
Can you suggest a better way for this newbie from some other profession previously? Thanks in advance.
...ANSWER
Answered 2022-Feb-19 at 11:12Using events in this way is a well-established way to provide this kind of communication. If you look for existing implementations of event emitters like Node.js's or search for "publish/subscribe," you'll find a lot of prior art you can draw on.
Some notes:
- Usually, you want to have a set of event handlers rather than allowing just one.
- Generally, the emitter would wrap calls to event handlers in
try/catchblocks so that a handler throwing an error doesn't prevent the emitter code from continuing to do its job (which is typically just to notify listeners of the event). - Some systems (including the DOM's) provide the same event object to all listeners, allowing a bit of cross-talk between them. Uncontrolled cross-talk is probably a bad idea, but some form of controlled cross-talk may be useful.
- Similarly some systems (including the DOM's) provide a way for the event listeners to cancel the event, preventing it reaching other listeners.
Another way to do communication along these lines when there's sequence (in a very broad sense) to be observed is to use coroutines. In JavaScript, coroutines can be implemented using generators, which are most easily created via generator functions. A generator is an object that produces and consumes values in response to a call to its next method.
Here's a really simple generator that only produces (doesn't consume) values:
QUESTION
I have the following problem...
emit was called after an event handler completed normally. This is usually due to an unawaited future in an event handler. Please make sure to await all asynchronous operations with event handlers and use emit.isDone after asynchronous operations before calling emit() to ensure the event handler has not completed.
BAD on((event, emit) { future.whenComplete(() => emit(...)); });
GOOD on((event, emit) async { await future.whenComplete(() => emit(...)); }); )
What happens is that in a function called _onLogIn, if the user has changed the language, it goes from there to another function inside the bloc, these two functions do not depend on each other, I mean that each function is called in different pages of the application, but still _onLogIn checks the _onChangeLanguage function.
...ANSWER
Answered 2022-Jan-25 at 16:20void _onChangeLanguage(
ChangeLanguageEvent event,
Emitter emit, {
bool isFromLogin = false,
}) async
QUESTION
I'm currently migrating a project from Bloc 7.0 to bloc 7.2
I use to have a stream which I would yield* inside different Streams & passing every time a different value as parameter
ANSWER
Answered 2022-Jan-18 at 12:43Definition:
QUESTION
I have a code like that:
...ANSWER
Answered 2022-Jan-18 at 08:48The moveTo method belongs to Camera object. ref.
I don't have the environment setuped to test. The code will look something like this:
QUESTION
I'm hoping to use SWC in Rust to generate some TypeScript code. Unfortunately, it seems the emitter can only print JavaScript. Is this correct, or is there a way to print TypeScript? For instance, let's say we're crafting the following AST.
...ANSWER
Answered 2021-Dec-29 at 12:46You need to first create a compiler (with the swc package not swc_common)
Inside your Cargo.toml dependencies add :
swc = { git = "https://github.com/swc-project/swc" }
QUESTION
I have a chained observable that I created like this:
...ANSWER
Answered 2022-Jan-08 at 16:19If it helps anyone... I didn't find an rxjava way to solve it so I solved in an on old java fashion way... I have created a builder class and added an observable to my main observable and at the end I returned everything. something like that:
QUESTION
I'm trying to define a strongly typed event-emitter, what I mostly want is to have the callback's event type inferred from the string passed to the addEventHandler function.
But I've failed so far, and what I came up with infers the event type from the callback, not the opposite.
Here's an example (with a fiddle):
...ANSWER
Answered 2022-Jan-01 at 19:58You can achieve this by making addEventHandler generic on the event type, rather than the event object.
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