Nebula | powerful framwork for building highly concurrent | Microservice library
kandi X-RAY | Nebula Summary
kandi X-RAY | Nebula Summary
Nebula is a flexible, high-performance business-oriented IoC distributed network framework developed in C++ language, designed for production environments. It supports multiple application layer communication protocols including proto3, http, https, http2, grpc, cassandra, and websocket. Nebula makes it easy to deploy a fast and high-performance distributed service with C++, while keeping the same server architecture and APIs. NebulaBootstrap provides out-of-the-box integration with Nebula service, but can be easily extended to serve other types of application. Nebula is a production level framework and distributed solution project for instant messaging, data collection, real-time computing, message push and other applications, as well as web api services. There were production applications for instant messaging, data acquisition and real-time analysis on line now, and a recommendation engine application for a large user base will be born soon. By the way, using Nebula for toy-level projects is also good for learning network communication. Bwar welcomes more developers to join the Nebula project. Nebula can be used as a single high-performance TCP server, but building a cluster based on Nebula will be truly reflect its value. In order to build distributed service clusters quickly, Nebula Bootstrap cluster solutions including various types of services have been developed.
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Trending Discussions on Nebula
QUESTION
Is there a Gradle pattern for retrieving the list of files in a folder or set of folders that contain a given string, set of strings, or pattern?
My project produces RPMs and is using the Nebula RPM type (great package!). There are a couple of different kinds of sets of files that need post-processing. I am trying to generate the list of files that contain the strings that are the indicators for post-processing. For example, files that contain "@doc" need to be processed by the doc generator script. Files that contain "@HOSTNAME@" and "@HOSTFQDN@" need to be processed by sed to replace the strings with the actual host name or host fqdn.
The search root in the package will be src\main\resources. With the result the build script sets up the post-install script commands - something like:
...ANSWER
Answered 2022-Feb-27 at 23:15I'm having difficulty finding the filter for any of the regular Gradle 'things' (i.e., FileTree) that operate on contents of files rather than names of files.
You can apply any filter you can imagine on a Gradle file tree, in the end it is just Groovy (or Kotlin) code running in the JVM. Each Gradle FileTree
is nothing more than a (lazily evaluated) collection of Java File
objects. To filter those File
objects, you can read their content, e.g. in the same way you would read them in Java. Groovy even provides a JDK enhancement for the Java class File
that includes the simple method getText()
for this purpose. Now you can easily filter for files that contain a certain string:
QUESTION
I am making a Javascript program and on of the functions is to convert altitude/azimuth to right-ascension/declination given a time and latitude. My code can find the declination fairly accurately, I checked with Stellarium. I have been using this site to help me with the math.
My program gives me the wrong value for horizontal ascension which I plan on using to find right ascension (I already have a function to find local sidereal time which works). Here is my code for the equation
var ha = asin(-sin(az)*cos(alt) / cos(dec)) * (180 / Math.PI);
this code is in Javascript but I defined custom sin/cos/asin functions that take degrees as input and return radians because that is the form my data is in.
The site I use also says that this equation should give the same result
var ha = acos((sin(alt) - sin(lat)*sin(dec)) / (cos(lat) * cos(dec))) * (180 / Math.PI);
but, the two equations give different results and neither are correct according to stellarium. I have checked that all the variables I am putting in are correct and I am almost certain I entered the equation correct. Here is the full code on github. I need help figuring out how to fix this problem.
--Note this can be run with node js with no libraries
The result I get is { ra: [ 23, 57, 37.9 ], dec: [ -5, 24, 38.88 ] }
It should be getting { ra: [ 5, 36, 22.6 ], dec: [ -5, 24, 38.88 ] it does not have to be exact, I only really care about the first number of ra (right ascension). It is also formatted in HMS format. The datetime is hardcoded to Febuary 1st 2022 12:00:00 so that is what you should set stellarium to if you are testing this out.
Here is the relevant code
ANSWER
Answered 2022-Feb-04 at 02:02Give the following a try. Notable changes include:
Specified 'GMT+0000' when establishing J2000.0 date, in addition to the date being passed in to
altazToradec()
. Otherwise, new Date() returns local time.Sourced calculation of 'DEC' and 'HA' from MathWorks.com (look under the "Functions" tab).
NOTE: 'HA' and 'RA' are in degrees, not hours. To convert to hours, multiply by (24 hrs / 360 deg), or simply divide by (15 deg / hr).
Sourced sample data from StarGazing.net.
QUESTION
I wanted to make a dynamic table view where a button was clicked to reveal a Table Row however, I get an error when I try to change the text of the button.
...ANSWER
Answered 2022-Jan-03 at 13:48Suggestions:
- Use "display" style, instead of "visibility", to don't let the space occupied on the page when it's not visible;
- It's not good idea have multiple elements with the same id (like "info"), because that breaks the rules of HTML;
- To show and hide, use read directly info from css, instead of use a auxiliary variable;
- The document.getElementsByTagName returns an object, not an array. The way to navigate is using the classic way.
Next, your code with some fixes:
QUESTION
I have a springboot project that we got going quickly by using the various appropriate spring-boot-starter jars to bring in the appropriate transitive dependencies that we needed. Now, as we get closer to production launch, we are adding code-quality and code-inspection tools to tighten up loose ends. Some of these are tagging the starter jars as problematic, but I am finding inconsistent advice as to how to handle the problem.
Spring.io documentation fails to weigh in on this. Starters are described here: Spring Starters, but it really just says they are used to "get going quickly" but does not indicate that they are intended for use in production. The starters are not listed in the 'production ready' features (which focuses on Actuator). The Packaging for Production makes no mention of starters. From Spring documentation alone, you are encougaged to use the starters (to get going quickly), but are not told to, or told not to, use them in production.
If the spring project adds either gradle-lint plugin, or uses maven-dependency-plugin, use of the starters flags problems. The starters include no code themselves, but they pull in useful transitive dependencies (by design), but that's contra-indicated by the lint plugins. Related incident here
From gradle-lint Generally, applications only use a subset of the libraries included in such families. The unnecessary dependencies included with the family both increase the footprint of the application itself. If the 'application' is actually itself a library, these unnecessary dependencies leak downstream to its users, increasing their footprint and potentially introducing breaking version conflict resolution problems.
Is the "right" answer to remove starter jars before going live? Should starters be used in production? I am sure there are plenty of projects that have gone to production with starters, and probably they have done so successfully. But it looks to me like the authorities differ on what to do, so looking to reconcile them.
...ANSWER
Answered 2021-Dec-03 at 17:42I think this is likely to be closed as it's opinion based. Speaking as a member of the Spring Boot team, the starters are absolutely intended for use in production. There's no point in something that gets you going quickly if it then creates more work later on. Some people dislike relying on transitive dependencies indirectly and believe that all dependencies that you require should be declared directly. I think the linting tools you've mentioned are enforcing this opinion. You can either configure the tool to quieten it or manually declare the starters' dependencies. I would do the former.
QUESTION
I currently have a header with a bootstrap carousel under the header. I want to make it so the header sits on top of the carousel so that when I make the header transparent it shows the images of the carousel through my header. Any input on this would be greatly appreciated and I have provided the code below.
app.component.html
...ANSWER
Answered 2021-Nov-13 at 09:38I found a solution by adding a position: absolute;
and a z-index: 1;
to my header component.
QUESTION
I have on my hand :
- an Airflow instance created using Google Composer in a VPC
- a postgres database on Scaleway protected by Nebula Mesh with a configurated RPN
My goal is to connect Airflow with the postgres Database.
My first thought was to create a NAT Gateway with Nebula mesh running on the router with associated certificates to use the ssl connection. But if I understand everything right, I can't install Nebula on the Google's CloudNAT/CloudRouter. I would need to create a NAT Proxy VM myself, which I guess isn't the simpliest idea.
Another idea was to "connect the VPC" to the Scaleway RPN using RPN VP allowing me to bypass Nebula. But I'm not sure how to do so, I tried creating a CloudVPN but something went wrong in the process and I didn't catch any pong.
Can anyone hint me on the right process to solve my problem ? What would be the easiest way to do it ? I'm not fluent yet with cloud platform and networking, so I'm kinda lost in the heavy documentation !
Thank's in advance
...ANSWER
Answered 2021-Nov-03 at 15:02It looks like cloud-vpn only supports IPsec and is not compatible with the OpenVPN protocol used by Scaleway's RPN-VPN.
To do a site-to-site vpn connection you'll need one of those:
- cloud-vpn compatible ipsec gateway on a Scaleway server connected to RPN v1
- a custom gateway connected on gcp with an openvpn client to RPN-VPN
QUESTION
I'm trying to integrate jquery into my wordpress theme. I have integrated this code into my function.php but it doesn't work. Can anyone see the problem? Thanks.
...ANSWER
Answered 2021-Oct-13 at 09:45Your Enqueue is wrong. Your enqueue script says that a script named 3.3.2
is a dependency and won't load your script unless it finds a script by that handle.
QUESTION
Recently I added some kotlin activities and a library project to current java project.
I can run project without any problem. clean - build - rebuild - run
all are ok.
the problem appears when generating signed APK. I get below error:
...ANSWER
Answered 2021-Sep-28 at 04:25I found the solution, thanks to @Fabio.
The problem was in buildTypes
structure. so, in app level I have release
and build
, but in library level I have release
and debug
.
I changed buildTypes in library level like this to be same like in app level:
QUESTION
Goodevening all.I am having trouble implementing my first bootstrap Nav bar. I have gotten it to succesfully work but my section that's right below it is overlaping the navbar (Im only able to see the navbar if i use a z-index of -1 but then the buttons in that section do not work). I have tried to change the heigh/width through css but am limited to how small I can make the section.
This is the problem i'm having: https://imgur.com/a/3CwLnK3
1st problem: You can see how the hero section goes over into the next area. Also how do i limit the margin on padding/margin on left and right of Hero section? I tried to adjust in css but it would not let me.
2nd problem: you can see how the img which is in the services section is not resizing itself to stay within the boxes (stars)
...ANSWER
Answered 2021-Sep-22 at 05:09The code is fine but consider changing the following styles
- Remove
left:425px
for the.icon img
this will fix the star image alignment issue - Remove
top:-49px
for the.container
this will fix the menu overlap issue - Remove
height: 50px
for the.hero
Here is the updated code
QUESTION
Find UPPERCASE names that start with either a letter or digits. Could include digits, hyphens, periods and spaces with colon at end of name.
...ANSWER
Answered 2021-Aug-15 at 17:27Try this pattern: ([A-Z0-9][A-Z0-9. -]+)(?=:\B)
See Regex101 Demo
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