producer | elements using the Eff monad | Functional Programming library
kandi X-RAY | producer Summary
kandi X-RAY | producer Summary
Simple generators for Scala. Producer supports effectful streams where effects are supported by the Eff monad. It is inspired by the scalaz-stream library at least for its API.
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producer Key Features
producer Examples and Code Snippets
Lines of Code : 7License : Permissive (MIT)
CopylibraryDependencies += "org.atnos" %% "producer" % "4.0.0"
// to write types like Reader[String, ?]
addCompilerPlugin("org.spire-math" %% "kind-projector" % "0.7.1")
// to get types like Reader[String, ?] (with more than one type parameter) correct public static void demoSingleProducerAndSingleConsumer() {
DataQueue dataQueue = new DataQueue(MAX_QUEUE_CAPACITY);
Producer producer = new Producer(dataQueue);
Thread producerThread = new Thread(producer);
Consumer public static void createBackup() throws Exception {
String inputTopic = "flink_input";
String outputTopic = "flink_output";
String consumerGroup = "baeldung";
String kafkaAddress = "localhost:9092";
StreamExe public static void main(String[] args) {
KafkaProducer producer = createKafkaProducer();
producer.initTransactions();
try {
producer.beginTransaction();
Stream.of(DATA_MESSAGE_1, DATA_MESSAGE_2)
Community Discussions
Trending Discussions on producer
QUESTION
I have a Spring Boot app with a Kafka Listener implementing the BatchAcknowledgingMessageListener interface. When I receive what should be a single message from the topic, it's actually one message for each line in the original message, and I can't cast the message to a ConsumerRecord.
The code producing the record looks like this:
...ANSWER
Answered 2021-Jun-15 at 17:48You are missing the listener type configuration so the default conversion service sees you want a list and splits the string by commas.
QUESTION
I made a consumer and producer class using spring. Now I want the consumer to trigger some api based on the messages sent by producer. How to do that? Please provide solution in JAVA SpringBoot. How to trigger an api from application.yml in consumer?
...ANSWER
Answered 2021-Jun-14 at 18:39when I add @postMapping here then it gives error
You can only add that annotation on REST server methods that handle incoming requests.
You are trying to make an outgoing HTTP call, then you need to use an HTTP Client of your choice, or a Spring RestTemplate
If you are trying to call any internal HTTP endpoint, then you should refactor your code to call methods of the same classes those HTTP resources interact with.
QUESTION
I am using the SQL connector to capture CDC on a table that we only expose a subset of all columns on the table. The table has two unique indexes A & B on it. Neither index is marked as the PRIMARY INDEX but index A is logically the primary key in our product and what I want to use with the connector. Index B references a column we don't expose to CDC. Index B isn't truly used in our product as a unique key for the table and it is only marked UNIQUE as it is known to be unique and marking it gives us a performance benefit.
This seems to be resulting in the error below. I've tried using the message.key.columns option on the connector to specify index A as the key for this table and hopefully ignore index B. However, the connector seems to still want to do something with index B
- How can I work around this situation?
- For my own understanding, why does the connector care about indexes that reference columns not exposed by CDC?
- For my own understanding, why does the connector care about any index besides what is configured on the CDC table i.e. see CDC.change_tables.index_name documentation
ANSWER
Answered 2021-Jun-14 at 17:35One of the contributors to Debezium seems to affirm this is a product bug https://gitter.im/debezium/user?at=60b8e96778e1d6477d7f40b5. I have created an issue https://issues.redhat.com/browse/DBZ-3597.
Edit:
A PR was published and approved to fix the issue. The fix is in the current 1.6 beta snapshot build.
There is a possible workaround. The names of indices are the key to the problem. It seems they are processed in alphabetical order. Only the first one is taken into consideration so if you can rename your indices to have the one with keys first then you should get unblocked.
QUESTION
I have csv file: Lets call it product.csv
...ANSWER
Answered 2021-Jun-13 at 20:31I don't think you have O(n) complexity, but a O(n^2), which means that for 100k lines your code will run for 220 minutes, not 22. What makes it worse is that you are reading the file each time you call findPreviousProduct. I would suggest first loading csv into memory and then searching it:
QUESTION
How can I ensure fairness in the Pub/Sub Pattern in e.g. kafka when one publisher produces thousands of messages, while all other producers are in a low digit of messages? It's not predictable which producer will have high activity.
It would be great if other messages from other producers don't have to wait hours just because one producer is very very active.
What are the patterns for that? Is it possible with Kafka or another technology like Google PubSub? If yes, how?
Multiple partitions also doesn't work very well in that case, or I can see how.
...ANSWER
Answered 2021-Jun-14 at 01:48In Kafka, you could utilise the concept of quotas to prevent a certain clients to monopolise the cluster resources.
There are 2 types of quotas that can be enforced:
- Network bandwidth quotas
- Request rate quotas
More detailed information on how these can be configured can be found in the official documentation of Kafka.
QUESTION
I am trying to use kafka rest proxy for AWS MSK cluster.
MSK Encryption details:
Within the cluster
TLS encryption: Enabled
Between clients and brokers
TLS encryption: Enabled
Plaintext: Not enabled
I have created topic "TestTopic" on MSK and then I have created another EC2 instance in the same VPC as MSK to work as Rest proxy. Here are details from kafka-rest.properties:
...ANSWER
Answered 2021-Jun-13 at 10:23Finally the issue was fixed. I am updating the fix here so that it can be beneficial for someone:
kafka-rest.properties file should have below text:
QUESTION
I read the book "Concurrency in Go" written by Katherine Cox-Buday and I don't understand comments for examples of buffered channels.
The author says:
...ANSWER
Answered 2021-Jun-12 at 18:10Yes, it sounds like this book needs a better editor!
the channel capacity is indeed indicated as the 2nd argument to make:
QUESTION
i am writing a simple nodejs kinesis producer client which fails with no helpful information. Here's the code:
...ANSWER
Answered 2021-Jun-12 at 11:09AWS Kinesis expecting Data in following form
QUESTION
Context:
- In Azure function with EventHubTrigger, I save data mapped from handled event to database (through the Entity framework). This action performs synchronously
- Trigger a new event about successful data insertion using event hub producer. This action is async
- Handle that triggered event at some other place
I guess it might happen that something fails during saving data, so I am wondering how to prevent inconsistency and secure that event is not sent if it should not. As far as I know Azure Event Hub has no outbox pattern implemented yet, so I guess I would need to mimic it somehow.
I am also thinking about alternative and a bit smelly solution to make this publish event method synchronous in step 2 (even if nature of the event-driven is to be async) and to add an addition check between step 1 and step 2 - to make sure that everything is saved in db. Only if that condition is fulfilled, event is going to be triggered (step 3).
Any advice?
...ANSWER
Answered 2021-Jun-11 at 19:52There's nothing in the SDK that would manage distributed transactions on your behalf. The simplest approach would likely be having a column in your database that allows you to mark when the event was published, and then have your function flow:
- Write to the database with the "event published" flag unset; on failure abort.
- Publish the event; on failure abort. (the data stays in written)
- Write to the database to set the "event published" flag.
You'd need a second Function running on a timer that could scan your database for rows older than XX minutes ago that still need an event, which then do steps 2 and 3 from your initial flow. In failure scenarios, you will have some potential latency between the data being written and the event published or may see duplicate events. (Event Hubs has an at least once guarantee, so you'll need to be able to handle duplicates regardless.)
QUESTION
i am working on a project with a react.js FE, a Node/Express.js BE and a database. I am currently working on a function which trigger my delete Route in BE. But my function trigger with every load and onlick, but should only trigger onClick.
Here are code samples of my service and my FE component. I am new to react.js so help would be apprechiated.
hardwareService.js:
...ANSWER
Answered 2021-Jun-11 at 15:51Replace this line:
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