rmq | A small java message queue based on Redis
kandi X-RAY | rmq Summary
kandi X-RAY | rmq Summary
The main difference is that subscribers don't need to be online or they will miss messages. rmq track which messages the client didn't read and it will ensure that the client will receive them once he comes online.
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Top functions reviewed by kandi - BETA
- Determines if this object exists
- Execute the given transaction
- Return the number of elements in the set
- Set the hash with the given hash
- Increments the counter
- Get the last index in the list
- Return the number of elements in the sorted set
- Return a list of all the elements in the given range
- Get the hash value for a field
- Set the value with the specified index
- Removes the elements from the specified set
- Publish a message
- Add a string to the list
- Add a member to the set
- Set a value
- Get the set of smembers
- Remove all elements from the set
- Add zcard
- Get the elements in the sorted set
- Get all elements in the sorted set with scores with a score
rmq Key Features
rmq Examples and Code Snippets
Community Discussions
Trending Discussions on rmq
QUESTION
I need to push messages to external rabbitmq. My java configuration successfully declares queue to push, but every time I try to push, I have next exception:
...ANSWER
Answered 2021-Jun-15 at 07:19I'm struggling to understand how that code fits together, but this part strikes me as definitely wrong:
QUESTION
Say I have multiple namespaces on a kube cluster and each namespace has a RMQ container, and these RMQ containers are spread throughout a few nodes, is there a way to deploy one metricbeat pod (preferably as a daemonset) per node to monitor these RMQ containers? What's the best practice regarding using Metricbeat for monitoring, do you need one metricbeat per container? Thanks.
...ANSWER
Answered 2021-Jun-09 at 13:19Metricbeat is installed as a daemonset to ensure that it can get all the node stats across all namespaces. So, you just need one instance of Metricbeat on every node in your k8s cluster
More details: https://www.elastic.co/guide/en/beats/metricbeat/current/running-on-kubernetes.html
QUESTION
I was wondering if someone can please help with the following situation:
I cannot solve a memory leak with a RabbitMQ Publisher written in C# and using .Net core 5.0.
This is the csproj file :
...ANSWER
Answered 2021-Apr-28 at 08:16First, it seems you are clogging the event handling thread. So, what I'd do is decouple event handling from the actual processing:
( Untested! Just an outline!)
REMOVED FAULTY CODE
Then in serviceInstance1, I would have Publish enqueue the orders in a BlockingCollection, on which a dedicated Thread is waiting. That thread will do the actual send. So you'll marshall the orders to that thread regardless of what you chose to do in Processor and all will be decoupled and in-order.
You probably will want to set BlockOptions according to your requirements.
Mind that this is just a coarse outline, not a complete solution. You may also want to go from there and minimize string-operations etc.
EDITSome more thoughts that came to me since yesterday in no particular order:
- May it be beneficial to ditch the first filter to filter out empty sets of JObjects later?
- Maybe it's worth trying to use System.Text.Json instead of Newtonsoft?
- Is there a more efficient way to get from xml to json? (I was thinking "XSLT" but really not sure)
- I'd recommend to rig up a Benchmark.Net with MemoryAnalyzer to document / proove your changes have positive effects.
- Don't forget to have a look into DataFlowBockOptions to tweak the pipeline's behavior.
QUESTION
I need to build a long running tasks service with using of external task manager. It is communicate with user with 2 channels: http\websocket and with task manager through http\RMQ
Communication schema is:
- user sending request for task creation
- my service send it to external task manager
- receiving response from task manager and make some task data postprocessing
- send response to user with "taskId"
- user waits for task events and update task status
The problem is that in some scenarios (when task failed or its has been very simple) task events come to my service very fast, until user's request finish, because postprocessing can take a little bit longer time, than task execution (especially in failed scenario).
So question is: how to make events guaranteed send after my service responded to user? Now I'm just using delays, but guess it is not best practice, because when connections is poor, my delay can be not enough.
The visual diagram of communication:
...ANSWER
Answered 2021-Apr-27 at 06:06If I understand your question, it comes down to this line: So question is: how to make events guaranteed send after my service responded to user?
This requires some other mechanism to allow fire-and-forget, but guarantee message delivery; and, the completion status, success or failure, is relayed back to the user in some way.
This is not a trivial problem, but luckily there has been some consensus on ways to tackle this sort of thing - and some common language has emerged, which you'll find in this answer to help you with your search. The ideas generally fall under the topic of CAP theorem. But a practical place to start is with something called Transactional Outbox (see https://microservices.io/patterns/data/transactional-outbox.html)
Two out-of-the-box (forgive the pun) solutions come to mind:
CAP for DotNetCore: https://cap.dotnetcore.xyz/ Even if you aren't developing in DotNetCore, you could find something similar in your implementation language, or roll your own similar solution. The basic idea is to use a database to capture the user action. Only if the action is committed to the database is the action deemed to have been digested. A second operation then guarantees that all persisted actions are followed through with: e.g. all events for that action are sent. On 'completion', an action is marked as done. For actions that never succeed, a dashboard alerts you for intervention. This is an implementation of a transactional outbox using a database. That's the general idea.
MassTransit: https://masstransit-project.com/articles/outbox.html There's many concepts that are pulled together to create a transactional outbox that's in memory - sort of. The basic premise is that the RabbitMQ persists the action that needs to happen (in the form of a message on a queue). You only ACK the message once the action is 'complete'. MassTransit employs some strategies to make this possible. Again, you could leverage this framework, or examine it to roll your own like solution.
Both solutions require idempotency. That is, because a failure can happen at any point, and entire process can be re-run (actions, events, etc), then they need to be repeatable without duplicates or side-effects.
In my current project, we use CAP DotNetCore for delivery that must not fail.
Hope this gets you started.
QUESTION
I am trying to follow the reference link (StreamBridge) and created a simple HTTP listener app that receives POST msg, validate incoming message with schema class & forward the request to RMQ. I am seeing RMQ connection denied error when I deploy the war (in CF) using SCDF. However, if I deploy the war using cf push, it works just fine. Do I have any additional RMQ configurations to do in StreamBridge WAR? I even compared env variables for RMQ Connection and it looks same in both the apps (SCDF deployed app & cf push app).
org.springframework.messaging.MessageHandlingException: error occurred in message handler [org.springframework.integration.amqp.outbound.AmqpOutboundEndpoint@6478a81c]; nested exception is org.springframework.amqp.AmqpConnectException: java.net.ConnectException: Connection refused (Connection refused), failedMessage=GenericMessage [payload=byte[25], headers={contentType=application/json, id=9720e9cb-3fa1-1634-2e4c-55a24fa68c8b, timestamp=1619097558777}]] with root cause
...ANSWER
Answered 2021-Apr-23 at 19:07I managed to resolve the issue with StreamBridge. No explanation I found for the different behavior on RMQ connection (cf push vs stream deployment) but by passing RMQ details (host, username, password and port) as arguments while creating a stream does the trick.
Link for reference: https://docs.spring.io/spring-cloud-dataflow/docs/current/reference/htmlsingle/#_application_properties
QUESTION
I have data from multiple suppliers which I wish to compare. The data shown in the image below has been previously transformed via a series of steps using power query. The final step was to pivot the Supplier column (in this example consisting of X,Y,Z) so that these new columns can be compared and the maximum value is returned.
How can I compare the values in columns X, Y and Z to do this? Importantly, X Y and Z arent necessarily the only suppliers. If I Add Say A as a new supplier to the original data, a new column A will be generated and I wish to include this in the comparison so that at column at the end outputs the highest value found for each row. So reading from the top down it would read in this example: 3,3,1,1,5,0.04,10 etc.
Thanks
Link to file https://onedrive.live.com/?authkey=%21AE_6NgN3hnS6MpA&id=8BA0D02D4869CBCA%21763&cid=8BA0D02D4869CBCA
M Code:
...ANSWER
Answered 2021-Apr-18 at 20:20- Add an Index Column starting with zero (0).
- Add a Custom Column:
QUESTION
I'm working on building a range minimum query program in C++ but I'm having a hard time working with dynamically sized vectors that are used throughout the program. Right now I am using a size_t** to make a 2d array of indexes to an array of elements, but it's not very nice to work with. I would much rather leverage existing c++ data structures like vectors, but I'm not sure how to make a member variable that is a pointer to a vector or some other data structure that can be manipulated in this way and access from anywhere in the class.
When I tried using a vector I could populate it and manipulate it in PrecomputedRMQ(), but when I tried to query in rmq() the memory was inaccessible and I would segfault.
In essence, how do I replace this use of size_t** with a vector>, and more generally, how do I initialize and allocate pointers to member variables of builtin data structures?
In Header:
...ANSWER
Answered 2021-Apr-12 at 11:24The key to replacing your current explicit memory handling with std::vector, you don't need the allocation loop.
All you need is e.g.
QUESTION
Background: The table below contains example data from relevant documents (the names of documents are MSDS, RMQ, COA, Technical Data sheet) for materials A,B,C etc. The information from these documents includes the date, Heavy Metal impurities and Residual Solvent impurities and their amount in ppm (parts per million).
Using power query I have sorted this data so that the 2 tables shown in the image below are produced.
These containing the highest amounts of heavy metals (blue) and residual solvents (yellow) found across the documentation as well as source of the document containing this value. To replicate the spreadsheet I have provided the (quite extensive) M code at the bottom. Very Briefly though for this problem; "Heavy Metals" and "Residual Solvents" are phrases used as delimiters to split the data accordingly.
Minor Problem: Although pleased with how the table functions, I didn't feel that the 'splitting of a split column' (see M code) is an entirely satisfactory solution to separate the data. Subsequently I've realised that If a cell were to accidently not include "Heavy Metals" as a delimiter the logic would cause the Residual Solvent data for this cell to be lost (as is the case for Cell 4E (Material C, technical data Sheet)).
I may just insist to those using this spreadsheet to ensure these phrases are always present however I wanted to ask here to see if anyone had any clever alternatives to the M Code provided so that although the Heavy Metals may be missing without the delimiter (or if spelled incorreclty), the Residual Solvents are still pulled through.
I appreciate that this is rather a tasking job for someone to look at, and fortunately it is a relatively minor issue so any advice would just be a bonus. I also just through it was quite quite interesting to show how power query can be used to split seemingly complex data within a cell. Also please note that the Data in the table is 'messy' to test if this causes any problems.
M Code: This is the Code for just the Residual Solvents Table. Power query splits the data into heavy Metals and Residual Solvents and then depending on the table removes the appropriate columns.
...ANSWER
Answered 2021-Apr-11 at 12:10I would do the splitting between solvent and metals differently, so that it doesn't matter if one category, or the other, is missing.
If there might be misspellings of Residual Solvents or Heavy Metals, you could even do some fuzzy matching instead of equality as I have in the code.
- Unpivot other than the
Materialcolumn to create three columns - Split the
Valuecolumn by line feed into rows TrimtheValuecolumn, then filter out the blanks- Add a custom column based on the Value column, copying over only anything that is a date, or the string
Heavy MetalsorResidual Solvents - Fill down so every row has an entry
- Filter out the dates (by selecting just the Metals and Solvents entries).
- Filter the Value and Custom columns (see notes in the code)
- Split the Value column between the substance and the amount
- This will leave you with a table of five columns
- You can filter the fifth column for either Metals or Solvents
- Then group by Material and extract what you want
M Code (for the solvents table)
QUESTION
Hello my fellow developers!
So I've been working on this app for a while now. I like to be up to date with the frameworks I use, so I regularly update when the frameworks release a new version. i.e. Angular 9 > 10. Angular 10 > 11.
So I just recently updated to Angular 11 and updated my nestjs and nx. And now when I try to serve my frontend app, Ivy seems to complain a lot.. but a.. lot... about modules that are not used in the frontend app.
...ANSWER
Answered 2021-Mar-28 at 15:10After a day's review of the project, I was:
importing a class from the middleware that was using a library of the backend.
using a library from the backend in the frontend
To fix the issues also complies with best-practices.
I have split the class in the middleware into two classes: one for the frontend, one for the backend. I have refactored the code so that the backend library was not necessary on the frontend. I ended up just fixing two files. And all the errors dissapeared.
So if you encounter something similar, double check whether or not you use some backend libraries/classes in your frontend.
QUESTION
const app = await NestFactory.create(AppModule, {
});
const app = await NestFactory.createMicroservice(AppModule, {
transport: Transport.RMQ,
options: {
urls: "amqps://user:pass@localhost",
queue: "queue",
queueOptions: {
durable: true,
},
},
});
ANSWER
Answered 2021-Mar-01 at 15:51If all you're needing to to make calls to RabbitMQ, then you can use the ClientsModule and create a microservice client as a part of your REST server, as described in the docs here. You can add this to your imports:
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Vulnerabilities
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Install rmq
You can use rmq like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the rmq component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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