statem | gen state management based on Harel Statechart
kandi X-RAY | statem Summary
kandi X-RAY | statem Summary
Next-gen state management based on Harel Statechart and SCXML. The big problem with complex application state is how to understand it and see whole picture from source code. "A Picture Costs A Thousand Words" - it is true for application state as well. UML solves this problem but requires additional efforts from a developer to draw all state diagrams. David Harel in the 1980s introduced statechart (now it became part of UML specification) that solves problems above. SCXML or the "State Chart extensible Markup Language" - an XML language that provides a generic state-machine based execution environment based on Harel statecharts. It is W3C approved standard that allows you to describe all your states as XML file. SCXML is very flexible and allows you to define compound and parallel states (so our logged state will handle disconnect event and show disconnection error to user and all logged UI screens could inherit it and don't care about this event) as well as conditional transitions. Each state could have onEntry, onExit runnable actions and transitions could have such custom actions as well. This tool provides automatic code generation from given statechart and allow to manage whole state of your app visually.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of statem
statem Key Features
statem Examples and Code Snippets
Community Discussions
Trending Discussions on statem
QUESTION
I have a pool of threads (QueueWorkers
class) in my program that are released using this logic:
ANSWER
Answered 2021-Jun-07 at 13:52Are sure the thread is in a cancelation or your thread cancelation_type
is asynchronous?
From man
of pthread_cancel
:
A thread's cancellation type, determined by pthread_setcanceltype(3), may be either asynchronous or deferred (the default for new threads). Asynchronous cancelability means that the thread can be canceled at any time (usually immediately, but the system does not guarantee this). Deferred cancelability means that cancellation will be delayed until the thread next calls a function that is a cancellation point. A list of functions that are or may be cancellation points is provided in pthreads(7).
I don't think canceling threads is the best ways to make sure that a thread will finish. Perhaps you can send the thread a message that it should stop and make sure the thread does receive the message and will handle it.
QUESTION
Can somebody explain how to use a continue statemant in a ternary operator?
...ANSWER
Answered 2021-Apr-24 at 12:39Ternary Operators has some special rules.
For example,you only can use expressions in these three parameters.
But continue;
is a complete sentence.So it can't work with Ternary Operators.
if you have to use Ternary Operators with continue,you can try this:
QUESTION
Suppose I am at network where there is MITM SSL swaping firewall (google.com is not issued by Google, but reissued by custom CA root authority) some more details here https://security.stackexchange.com/questions/107542/is-it-common-practice-for-companies-to-mitm-https-traffic .
I have simple Dockerfile:
...ANSWER
Answered 2021-Apr-25 at 16:06Append your self-signed cert to /etc/ssl/certs/ca-certificates.crt
manually.
Assuming you have the self-signed certificate in a file in your build directory called my-cert.pem
:
QUESTION
I have to do a bash script that shows disk usage and free space and if certain point is set as an argument of that script, allow user to select files that are greater than 10MB and delete them or pack and move them somewhere else and check if that point is satisfied if not repeat that action. So far for listing files from all of /home/$USER that are over 10MB i got this command line:
...ANSWER
Answered 2021-Mar-10 at 17:04Paths are allowed to have any characters except zero byte. The only possible way to work safely with any files is to use zero separated streams. Note that you have to have GNU tools then as they support various -z
/-0
options, or use a different programming language. A common trick is to put before the filename stuff that will have known format, and then put the filename. That way you can extract them with like a regex (or with cut -d' ' -f2-
).
QUESTION
I am trying to build a custom alpine docker image using Kaniko
.
When I attempt to use the APK
package manager to download package, I see the following ssl error.
ANSWER
Answered 2021-Feb-25 at 05:45The issue was not due to configuration. The issue was due to alpine image. There is a bug with 13.3.2.
I reverted my image to alpine3.12
.
QUESTION
Here is a df for example:
...ANSWER
Answered 2021-Feb-01 at 16:53test_df %>%
group_by(plant_sp) %>%
mutate(is_na_nest_row = +any(is.na(sp_rich)))
# # A tibble: 20 x 3
# # Groups: plant_sp [5]
# plant_sp sp_rich is_na_nest_row
#
# 1 plant_1 1 0
# 2 plant_1 1 0
# 3 plant_2 NA 1
# 4 plant_2 1 1
# 5 plant_3 NA 1
# 6 plant_3 1 1
# 7 plant_3 0 1
# 8 plant_3 0 1
# 9 plant_3 NA 1
# 10 plant_4 0 0
# 11 plant_4 0 0
# 12 plant_4 1 0
# 13 plant_4 0 0
# 14 plant_4 0 0
# 15 plant_4 1 0
# 16 plant_5 0 1
# 17 plant_5 NA 1
# 18 plant_5 NA 1
# 19 plant_5 0 1
# 20 plant_5 NA 1
QUESTION
1. Entity (table) CurrentyEntity.java
...ANSWER
Answered 2021-Jan-15 at 08:36This is happening due to the following reason.
The first time when you launch the application, It makes 3 entries in DB. 1 entry from RoomDb class( Jordan one), 2 entries from the Home Activity class.
Now if you close the application by pressing the device back button and reopen it,It makes another 2 entries in DB ( Home Activities entry ( easy & letsee ). There will be no entry from RoomDB class ( Jordan one) because DB connection is still open. So
QUESTION
I new one in using antlr and with my c# I am facing to problem in this very simple grammar:
...ANSWER
Answered 2021-Jan-20 at 16:08I would suggest that, the more complex your grammar is the MORE you want to use explicit Lexer rules (ex: ADD: "+";) and the MORE you want to label the parts of your parser rules (like op=).
These give you tools to write visitor/listener code that is easier to follow and less prone to errors.
"Is there in IF statement possible to visit node value of my ANTLR tree which contains token '+' without using children?" -> yes, label the operator in your parse rule with the op= notation. Then you can refer to is by name rather than it's position within your children nodes.
There really isn't an answer to making things easier while not doing the things you say you don't want to do.
Trust me, start using tools like explicit Lexer rules and labelling the parts of your parser rules. You'll be glad you did in the long run.
QUESTION
I am working with a quite large dataset (around 500Mio-Triples) stored in graphDB Free and running on my local developer machine.
I want to do some operations with the dataset with RDF4J and have to SELECT more or less the whole dataset. To do a test, I just SELECT the desired tuples. The code runs fine for the first Million tuples, after that it gets really slow since graphDB continues to allocate more RAM.
Is there the possibility to do a SELECT-Query on very big datasets and get them in batches ?
Basically I want just to "Iterate" trough some selected triples, so there should be no need to use that much RAM from graphDB. I can see that I allready get data in RDF4J before the query finishes, since it crashes (HeapSpaceError) only at about 1.4 Mio read tuples. Unfortunately somehow graphDB doesn't free the memory of the allready read tuples. Am I missing something?
Thanks a lot for your help.
ps. I allready set the usable heapSpace of graphDB to 20GB.
The RDF4J (Java) Code looks like following:
...ANSWER
Answered 2021-Jan-06 at 22:46I don't know immediately why the query given would be so costly, memory-wise, for GraphDB Free to execute, but generally a lot can depend on the shape and size of your dataset. Of course, doing a query that basically retrieves the entire database is not necessarily a wise thing to do in the first place.
Having said that, there's a couple of things you can try. Working with LIMIT
and OFFSET
as a pagination mechanism is one way.
Another option you could try is to split your query in two: one query retrieves all identifiers of resources you're interested in, and then you iterate over those and for each do a separate query to get the details (attributes and relations) for that particular resource.
In your example, you could split on ?row
, so you'd first do a query to get all rows for the given table:
QUESTION
I confront with the following error when send request (in my local envirement):
...ANSWER
Answered 2020-Sep-21 at 17:39The issue was with my node version. Updated from 10.19.0
to 12.18.4
and worked just fine.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install statem
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page