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QUESTION
I understand how I can await
on library code to wait for a network request or other long-running action to complete, but how can I await
on my own long-running action without busy waiting?
This is the busy-waiting solution. How can I make it event-driven?
...ANSWER
Answered 2021-May-19 at 22:46Generally in concurrency a "future" is placeholder for a return value and it has an associated "promise" that is fulfilled to pass the final return value.
In C#, they have different names: the future is a Task and the promise is a TaskCompletionSource.
You can create a promise, await on it, and then fulfill it when you get your callback:
QUESTION
In my project I'm using Jhipster Spring Boot and I would like to start 2 instances of one microservise at the same time, but on different instances of a database (MongoDB).
In this microservice I have classes, services, rests that are used for collections A, B C,.. for which now I would like to have also history collections A_history, B_history, C_history (that are structured exactly the same like A, B, C) stored in separated instance of a database. It makes no sense to me to create "really separated" microservice since I would have to copy all logic from the first one and end up with doubled code that is very hard to maintain. So, the idea is to have 2 instances of the same microservice, one for A, B, C collections stored in "MicroserviceDB" and second for A_history, B_history, C_history collections stored in "HistoryDB".
I've tried with creating 2 profiles, but when I start from a command line History microservice, it is started ok, but if I also try to start "original" microservice at the same time, it is started but immediately history service becomes "original" microservice. Like they cannot work at the same time.
Is this concept even possible in microservice architecture? Does anyone have an idea how to make this to work, or have some other solution for my problem?
Thanks.
application.yml
...ANSWER
Answered 2021-May-20 at 09:18In general, this concept should be easily achievable with microservices and a suiting configuration. And yes, you should be able to use profiles to define different database connections so that you can have multiple instances running.
I assume you are overwriting temporary build artifacts, that's why it is not working somehow. But that is hard to diagnose from distance. You might consider using Docker containers with a suiting configuration to increase isolation in this regard.
QUESTION
I want to use wolkenkit's eventstore and was trying to set up a quick example. But I'm not able to simply output an event stream.
Simplified example:
...ANSWER
Answered 2019-Apr-17 at 17:16According to the documentation of wolkenkit-eventstore, getUnpublishedEventStream
is an async
function, i.e. you have to call it with await
. Otherwise, you don't get a stream back, but a promise (and a promise doesn't have a pipe
function).
So, this line
QUESTION
I'm trying to convert a password to a sha1 sum before submitting. I'm using crypto.subtle.digest
to do the conversion. Since it returns a promise, I await on it. The problem is, that the password is submitted unconverted.
ANSWER
Answered 2019-Apr-02 at 08:50Your handler is not running at all, because the listener is not attached properly:
QUESTION
I have some spring-boot micro-services deployed on Cloud Foundry and I have to implement propagation and storing (to a repository) the business audit events emitted by them.
I can do it in several ways, e.g.:
- Publish audit events to a
Source
(Spring Cloud Stream
/ RabbitMQ) and consume it by aSink
service writing the events to the repository. - Publish audit events as a custom application log and consume it by a
log-consuming service
filtering and writing the events to the repository. - Publish audit events using
internal CF's mechanism
as a new customlog type
or a customaudit event
- I think this option isn't a good idea but I can be wrong...
Is there any recommended approach/pattern to realize this issue on Cloud Foundry platform?
EDIT
All the approaches meet (in my opinion) the 12-factor rules, but each has its advantages and disadvantages:
- (1) Spring Cloud Streams
+
ensures delivery (events will not be lost)+
allows to use routing (RabbitMQ)-
requires connection to a message broker (not as easy as a logger)
- (2) log-consuming service
+
is easy-
logs can be lost-
audit biznes info is too widely propagated - GDPR
- (3) new CF's log type
-
probably forces changes in the CF
ANSWER
Answered 2018-Oct-30 at 06:25In my application I stick with 12 factor application rules.
The 11th rule is: Treat logs as event streams
This is the important part about logging:
A twelve-factor app never concerns itself with routing or storage of its output stream. It should not attempt to write to or manage logfiles. Instead, each running process writes its event stream, unbuffered, to stdout. During local development, the developer will view this stream in the foreground of their terminal to observe the app’s behavior.
In staging or production deploys, each process’ stream will be captured by the execution environment, collated together with all other streams from the app, and routed to one or more final destinations for viewing and long-term archival. These archival destinations are not visible to or configurable by the app, and instead are completely managed by the execution environment. Open-source log routers (such as Logplex and Fluentd) are available for this purpose.
So, suggested method is to write logs to stdout.
QUESTION
I can see the Repository level Audit log in the Repository Settings, and I can see the Project level Audit log in the Project Settings.
What about the "System" level audit log which contains Server, User Management, Permission events, etc., per https://confluence.atlassian.com/bitbucketserver/audit-events-in-bitbucket-server-776640423.html?
I am on version 5.1, and I have "System Admin" permission, but I do not have access to the logs on the server (i.e. /log/audit). Also, I exported the support zip via "Support Tools" with all application logs enabled, and it does not appear to contain the audit logs.
...ANSWER
Answered 2018-Feb-05 at 13:45You can't see the "System" level audit logs via Bitbucket server UI. You only can see these logs looking at the files located at BITBUCKET_HOME/log directory at the Bitbucket server machine.
QUESTION
Is there a possibility to capture an exit or quit in ST3?
I saw this older question here and I tried both the on_windows_command
and the on_text_command
but neither seems to trigger the quit/exit!?
It there's none, it would also be fine if I could handle it on a restart of sublime, but the on_load
doesn't seem to be called again on remembered views!?
ANSWER
Answered 2017-Oct-20 at 14:04Currently there is no way to tell when ST exits: https://github.com/SublimeTextIssues/Core/issues/10
The reason why on_load
isn't called for remembered tabs when ST loads is because your plugin hasn't loaded yet. You can use the plugin_loaded
method to tell when your plugin has loaded and then manually cycle through all windows and all views, but this will also be executed when your plugin is updated, so you may want to think about how best to work around that.
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