lagom-samples | open source framework for building reactive microservice

by lagom Java Version: Current License: CC0-1.0

X-Ray Key Features Code Snippets Community Discussions(1)Vulnerabilities Install Support

kandi X-RAY | lagom-samples Summary

lagom-samples is a Java library typically used in Big Data, Spring Boot applications. lagom-samples has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. However lagom-samples build file is not available. You can download it from GitHub.

Lagom is an open source framework for building reactive microservice systems in Java or Scala. This repository contains code examples to help you understand how to achieve common goals. In general, code in each folder of this repository tries to answer a question of type "How do I xyz ?". For example: "How do I use RDBMS read-sides with Cassandra write-sides?".

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lagom-samples has a low active ecosystem.

It has 85 star(s) with 76 fork(s). There are 10 watchers for this library.

It had no major release in the last 6 months.

There are 33 open issues and 31 have been closed. On average issues are closed in 53 days. There are 3 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of lagom-samples is current.

Quality

lagom-samples has no bugs reported.

Security

lagom-samples has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

lagom-samples is licensed under the CC0-1.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

lagom-samples releases are not available. You will need to build from source code and install.

lagom-samples has no build file. You will be need to create the build yourself to build the component from source.

Top functions reviewed by kandi - BETA

kandi has reviewed lagom-samples and discovered the below as its top functions. This is intended to give you an instant insight into lagom-samples implemented functionality, and help decide if they suit your requirements.

Adds the checkout event
Sets the checkout date
Find the report with the given ID
Create a new shopping cart report
Sets the creation date
Sets the id
Returns a shopping cart report
Check a shopping cart
Get the entity reference
Find an existing shopping cart
Send Hello request
On checkout out
Handles a remove item
The shopping cart topic
Modify itemQuantity
Returns the shopping cart view
On add item
Add a quantity to an inventory
Start a Hello command
Registers an event handler for the HelloStateChanged event
Lists user greetings
Gets the command handler
Use this method to use a greeting message
OnAdjustItemQuantity adjustment

Get all kandi verified functions for this library.

lagom-samples Key Features

No Key Features are available at this moment for lagom-samples.

lagom-samples Examples and Code Snippets

No Code Snippets are available at this moment for lagom-samples.

Community Discussions

Trending Discussions on lagom-samples

In lagom: on increasing concurrent http calls, thread count (akka.actor.default-dispatcher) keeps increasing. How to control this behaviour?

QUESTION

In lagom: on increasing concurrent http calls, thread count (akka.actor.default-dispatcher) keeps increasing. How to control this behaviour?

Asked 2021-Apr-12 at 06:51

We observe that on increasing concurrent http calls to our service, thread count (akka.actor.default-dispatcher) keeps increasing (see screenshot from visualVM). Also after the requests stop, the thread count don’t go down. And most of these remain in PARK state. Is this proportional increase of threads an expected behaviour? How do we control this and reuse the same actors or kill the actors after request has been served.

I’m running the shopping-cart example from lagom-samples.

...

ANSWER

Answered 2021-Apr-12 at 06:51

Are you blocking in your calls? Eg, are you calling Thread.sleep? Or using some synchronous IO? If so, then what you're seeing is entirely expected.

Lagom is an asynchronous framework. All the IO and inter-service communication mechanisms it provides are non blocking. Its thread pools a tuned for non blocking. If you only using non blocking calls, you will see the thread pools behave with very low thread counts, and you won't find things going unresponsive.

But the moment you start blocking, all bets are off. Blocking requires one thread per request.

The default dispatcher that Akka uses is a fork join pool. It is designed for asynchronous use. If you block in a thread in its pool, it will start another thread to ensure other tasks can continue. So, that's why you see the thread pool grow. Don't block, and this won't happen.

The thread pool executor on the other hand uses a fixed number of threads. If you block on this, then you risk deadlocking the entire application. Don't block, and this won't happen.

Source https://stackoverflow.com/questions/66939447

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

Vulnerabilities

No vulnerabilities reported

Install lagom-samples

You can download it from GitHub.
You can use lagom-samples 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 lagom-samples 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 .

Support

How do I authenticate/authorize by JWT? (Java/Maven example, Scala/Sbt example)How do I generate OpenAPI/Swagger Specification for Lagom service? (Java/Maven example, Scala/Sbt example)How do I using Play's JPA API to do CRUD-oriented persistence in a Lagom service? (Java/SBT example)How do I use MongoDB as read-side in a Lagom service? (Scala/SBT example)How do I use a Lagom service in JavaScript? (Scala/SBT example)

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