servicebroker | Open Service Broker API Specification | REST library
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QUESTION
We have a .NET Core application that uses dependency injection heavily. Within our class we have a raised event, however, in this event we want to make use of one of the instances of an DI object. This however doesn't exist, which is understandable.
How can we make use of this instance from within the event?
...ANSWER
Answered 2021-Oct-08 at 20:10The problem is most likely the lifetime of _mediator
: The OnTableUpdate
event may fire long after whatever uses GetSQLDependancyHandler
has completed and the object got cleaned up.
The common solution is injecting an IServiceScopeFactory
object (which is a singleton), which you can then use in your event handler:
QUESTION
We are using SQL Service Broker, using two services for initiator and target, then we have a C# service listening and receiving messages from queue.
On SQL Side the setup is this:
...ANSWER
Answered 2021-Sep-27 at 17:19How can we clear these end dialog messages? Should we listen also on the initiator queue these kind of messages, in order to end the conversation, or should we do anything else?
Yes, you also need a service (technically any SQL process) that listens for initiator queue messages to end that side of the conversation when an EndDialog or Error is message received. Consider logging any unexpected message types (i.e. other than EndDialog).
You'll eventually fill up data database with unneeded initiator queue messages if no action is taken,
QUESTION
I have database trigger that sends messages to Service Broker Service. To send a message, conversation has to be created first because that is how Service Broker works (messages are sent on the conversation between the services). I read that conversations should be reused because creating new conversation each time can have bad impact on performance and number of conversations can grow to much. Whether or not I will reuse conversations, I have to create at least first conversation. Beginning conversation has following syntax:
...ANSWER
Answered 2021-Jun-11 at 14:14Service Broker requires a service for both initiator and target. Your trigger is the from initiator service so you should create a service and queue for that. However, the trigger does not need to implement receiving messages from the initiator queue.
You can have a separate process (perhaps a scheduled batch process) to monitor the initiator queue for unexpected error and end dialog messages, and perhaps start a new long-running conversation when needed.
QUESTION
I'm having trouble understanding the basic concept of MoleculerJS. I have a method called when a SQS message received.
...ANSWER
Answered 2021-Mar-15 at 20:45lifecycle methods don't have any input params meaning that you don't have context object by default.
However, you can use await this.broker.call("service.name", {data})
and call another service.
QUESTION
I have got this docker-compose.yaml. It defines 1 service with the public API and 4 services (replicated) with another two microservices each one (one receives events and another one saves info to mongo). This works perfectly when i do "docker-compose up". But I want to run each images with "docker run".
...ANSWER
Answered 2021-Feb-22 at 12:17Just set the env vars in docker run
, as well
E.g.
QUESTION
We are trying to launch webservices asynchronously from SQL Server and Service Broker seemed the most interesting choice.
For Service Broker itself many different examples can be found online. I managed to have a working example in which I sent several parameters in a message on a queue and have the queue trigger automatically when a message arrives on it.
The problem is that the code works fine when I just save the information to another table but it fails when I try to call a webservice. It then has the effect of stopping the queue.
It still works when I run the stored procedure by itself but not as a trigger on the queue.
Does anyone have an idea of what I am doing wrong please?
My Stored Procedure for getting the message from the queue is as follows :
...ANSWER
Answered 2021-Feb-08 at 12:10Seems our issue is resolved ; Had to set "SET TRUSTWORTHY ON " in the database were the servicebroker is running.
QUESTION
I'm working with an OpenAPI 3.0.1 yaml and it's unable to get the API webserver started due to the below error. I tried almost everything that is under my knowledge but I'm very new at OpenAPI and the documentation was followed as it is. Any thoughts on what could be wrong here?
This is the error on loading up the server:
...ANSWER
Answered 2020-Jun-26 at 15:50The operationId must be relative to where your app is running.
QUESTION
I'm beginner at moleculer and microservices . I created an api gateway via nestjs framework and now I want to call microservice in moleculer via nats messaging from nestjs. so my question is : How can I call a service in molculer and what is message pattern in nestjs to call moleculer action?
after creating a template via molculer I have bellow files and I want to call "greeter.hello" action. How can I do?
greeter.service.js :
...ANSWER
Answered 2020-Apr-26 at 08:52QUESTION
I am having fun with using moleculer-runner instead of creating a ServiceBroker instance in a moleculer-web project I am working on. The Runner simplifies setting up services for moleculer-web, and all the services - including the api.service.js file - look and behave the same, using a module.exports = { blah }
format.
I can cleanly define the REST endpoints in the api.service.js file, and create the connected functions in the appropriate service files. For example aliases: { 'GET sensors': 'sensors.list' }
points to the list()
action/function in sensors.service.js
. It all works great using some dummy data in an array.
The next step is to get the service(s) to open up a socket and talk to a local program listening on an internal set address/port. The idea is to accept a REST call from the web, talk to a local program over a socket to get some data, then format and return the data back via REST to the client.
BUT When I want to use sockets with moleculer, I'm having trouble finding useful info and examples on integrating moleculer-io with a moleculer-runner-based setup. All the examples I find use the ServiceBroker model. I thought my Google-Fu was pretty good, but I'm at a loss as to where to look to next. Or, can i modify the ServiceBroker examples to work with moleculer-runner? Any insight or input is welcome.
...ANSWER
Answered 2020-Jan-16 at 13:29It doesn't matter if your services use (or not) socket.io. All the services are declared in the same way, i.e., module.exports = {}
Below is a working example with socket.io.
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