pubsub | EventBus system for publish and subscribe to events | Pub Sub library

 by   mathieucarbou Java Version: Current License: No License

kandi X-RAY | pubsub Summary

kandi X-RAY | pubsub Summary

pubsub is a Java library typically used in Messaging, Pub Sub applications. pubsub has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

Mycila Event is a new powerful event framework for in-memory event management. It has a lot of features similar to EventBus but is better written and uses Java Concurrency features to provide you with:.

            kandi-support Support

              pubsub has a low active ecosystem.
              It has 30 star(s) with 6 fork(s). There are 3 watchers for this library.
              It had no major release in the last 6 months.
              There are 1 open issues and 8 have been closed. On average issues are closed in 379 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of pubsub is current.

            kandi-Quality Quality

              pubsub has no bugs reported.

            kandi-Security Security

              pubsub has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              pubsub does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              pubsub releases are not available. You will need to build from source code and install.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed pubsub and discovered the below as its top functions. This is intended to give you an instant insight into pubsub implemented functionality, and help decide if they suit your requirements.
            • Instantiates a Publisher instance
            • Register the given instance
            • Convert interceptor to JDK
            • Intercepts a method interceptor
            • Publish event for a topic
            • Gets the subscriptions for a given event
            • Creates an event
            • Creates a module that implements the Mycila Event interface
            • Retrieves a value from the cache
            • Get the target class
            • Adds a subscription to a given topic matcher
            • Factory method to create a subscription based on a set of topics
            • Creates a fast class
            • Returns the class loader for the given type
            • Handles a request
            • Handles publishing
            • Compares two EventQueue objects for equality
            • Reply an error
            • Returns all fields that match the given predicate
            • Set reply
            • Create a Requestor
            • Predicate that returns a predicate that matches the given parameters
            • Creates an array of topics
            • Compares this signature with the specified signature
            • Returns true if the given method overrides a method
            Get all kandi verified functions for this library.

            pubsub Key Features

            No Key Features are available at this moment for pubsub.

            pubsub Examples and Code Snippets

            No Code Snippets are available at this moment for pubsub.

            Community Discussions


            Firestore, query and update with node.js
            Asked 2021-Jun-15 at 20:01

            I need a cloud function that triggers automatically once per day and query in my "users" collection where "watched" field is true and update all of them as false. I get "13:26 error Parsing error: Unexpected token MyFirstRef" this error in my terminal while deploying my function. I am not familiar with js so can anyone please correct function. Thanks.



            Answered 2021-Jun-15 at 16:13

            There are several points to correct in your code:

            • You need to return a Promise when all the asynchronous job is completed. See this doc for more details.
            • If you use the await keyword, you need to declare the function async, see here.
            • A QuerySnapshot has a forEach() method
            • You can get the DocumentReference of a doc from the QuerySnapshot just by using the ref property.

            The following should therefore do the trick:



            Dynamically set bigquery table id in dataflow pipeline
            Asked 2021-Jun-15 at 14:30

            I have dataflow pipeline, it's in Python and this is what it is doing:

            1. Read Message from PubSub. Messages are zipped protocol buffer. One Message receive on a PubSub contain multiple type of messages. See the protocol parent's message specification below:



            Answered 2021-Apr-16 at 18:49


            Apache Beam Python gscio upload method has @retry.no_retries implemented causes data loss?
            Asked 2021-Jun-14 at 18:49

            I have a Python Apache Beam streaming pipeline running in Dataflow. It's reading from PubSub and writing to GCS. Sometimes I get errors like "Error in _start_upload while inserting file ...", which comes from:



            Answered 2021-Jun-14 at 18:49

            In a streaming pipeline, Dataflow retries work items running into errors indefinitely.

            The code itself does not need to have retry logic.



            Ensure Fairness in Publisher/Subscriber Pattern
            Asked 2021-Jun-14 at 01:48

            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.



            Answered 2021-Jun-14 at 01:48

            In 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:

            1. Network bandwidth quotas
            2. Request rate quotas

            More detailed information on how these can be configured can be found in the official documentation of Kafka.



            Include custom attributes using Spring Cloud Stream (StreamBridge)
            Asked 2021-Jun-13 at 13:20

            This document describes how to include custom attributes into PubSub messages.


            Is this possible using the newer Spring Cloud Stream functional APIs?



            Answered 2021-Jun-13 at 13:20

            You can publish Spring Message and specify your attributes as headers



            Redis sentinel node can not sync after failover
            Asked 2021-Jun-13 at 07:24

            We have setup Redis with sentinel high availability using 3 nodes. Suppose fist node is master, when we reboot first node, failover happens and second node becomes master, until this point every thing is OK. But when fist node comes back it cannot sync with master and we saw that in its config no "masterauth" is set.
            Here is the error log and Generated by CONFIG REWRITE config:



            Answered 2021-Jun-13 at 07:24

            For those who may run into same problem, problem was REDIS misconfiguration, after third deployment we carefully set parameters and no problem was found.



            Can we get conversation history from Azure Web PubSub
            Asked 2021-Jun-11 at 14:35

            I am developing a chat window using Can we get conversation history from Azure Web PubSub. Is there a way i can get the convesation history.



            Answered 2021-Jun-11 at 14:35

            According to this FAQ, the Azure Web PubSub service works as a data processor service and does not store customer messages. Therefore, you need to leverage other Azure services to store the conversation history. There is a Chatr application built by Ben Coleman which may be a good reference for you. You could start from this blog.



            how to integrate events from Azure Events Hub (kafka interface) to google cloud pub/sub
            Asked 2021-Jun-11 at 12:56

            I have a requirement where I need to consume a kafka topic on Azure events hub. POST endpoint needs to be created which will consume a topic provided as an argument. The message has to be send on a pubsub topic with the kafka topic as attribute and the message content as body.

            This is a high level requirement. I have looked here to understand how this can be achieved. However, if anyone has implemented this in real time that is events from Azure events hub to google cloud pub sub or have worked on similar implementation, please help.



            Answered 2021-Jun-10 at 07:58

            As discussed in the comment section, in order to further contribuite to the community, I am posting the summary of our discussion as an answer.

            Since your data's destination is BigQuery, you can use the Kafka to BigQuery template in Dataflow, you can use this template to load json messages from Kafka to BigQuery. In addition, according to the documentation,

            How to use this Dataflow template Kafka to BigQuery This template creates a streaming pipeline that ingests JSON data from Kafka, executes an optional JavaScript user defined function (UDF), and writes the resulting records to BigQuery. Any errors during the transformation of the data, execution of the UDF, or writing into BigQuery will be written into a separate errors table in BigQuery. The errors table will be created if it does not exist.

            Pipeline Requirements

            • The Kafka topic(s) exists and the message is encoded as a valid JSON.

            • The BigQuery output table exists.

            • The Kafka brokers are reachable from the Dataflow worker machines.

            On the other hand, you can create your own template with your specific requirements using the KafkaIO method, you can check this tutorial to understand better how to start with.



            Pub/Sub Ordering and Multi-Region
            Asked 2021-Jun-09 at 15:10

            While searching for the ordering features of Pub/Sub I stumbled upon the fact that ordering is preserved on the same region. Supposing I have ordered Pub/Sub subscriptions outside of GCP. Each subscription is on a different Datacenter on a Different Provider on another Region. How can I specify that those subscriptions will consume from a specific region? Is there an option on an ordered subscription to specify a region? If not then how Pub/Sub decides which region my application is located since it is provisioned in another datacenter, on another provider. Is the region assigned going to change?



            Answered 2021-Jun-09 at 15:10

            The ordering is preserved on the publish side only within a region. In other words, if you are publishing messages to multiple regions, only messages within the same region will be delivered in a consistent order. If your messages were all published to the same region, but your subscribers are spread across regions, then the subscribers will receive all messages in order. If you want to guarantee that your publishes all go to the same region to ensure they are in order, then you can use the regional service endpoints.



            Terraform GCP Assign IAM roles to service account
            Asked 2021-Jun-08 at 17:19

            I'm using the following



            Answered 2021-Jun-06 at 21:47

            I think this is achieved with this resource:


            So with your code, minus the data sources, alter to taste:


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install pubsub

            You can download it from GitHub.
            You can use pubsub 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 pubsub 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 For Gradle installation, please refer .


            Mycila Event is a new powerful event framework for in-memory event management. It has a lot of features similar to EventBus but is better designed, uses Java Concurrency features and has a lot of more event features than EventBus, which are really useful when you work with a complex system driven by event messaging.
            Find more information at:

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