The Pronghorn Coroutine Framework is a Kotlin framework for development of high performance, IO-driven applications. It is opinionated about its threading model, and currently does not support blocking operations.
Note: Pronghorn is still considered early in development. As such, documentation is minimal and APIs may change. Pronghorn is actively being used by a private project, and so it will continue being developed. If you are interested it is recommended that you follow the project for updates. Documentation will be forthcoming when the API stabilizes.
This framework is best suited for IO-driven applications where high performance is critical. For instance, a web server.
Pronghorn is available via Maven Central. The current version is 0.2.1.
Applications built with the framework consist of one or more services each running on a set of workers, typically one worker per thread. Shared data is minimized between workers allowing each worker's services to function without synchronization mechanisms.
The following is a simple Hello World example of a Pronghorn Coroutine Framework application.
class ExampleApplication(workerCount: Int): CoroutineApplication<ExampleWorker>() {
override val workers: Set<ExampleWorker> = (0 until workerCount).map { ExampleWorker() }.toSet()
}Let's start by defining an ExampleApplication class that extends the CoroutineApplication abstract class. This generic class takes a type parameter declaring what type of worker this application will use. In addition, the number of workers to spawn, and a method that produces new workers must be defined.
class ExampleWorker : CoroutineWorker(){
override val initialServices = listOf(ExampleService(this))
}Next, an ExampleWorker class worker extends the CoroutineWorker abstract class, and at a minimum must define a list of services to run.
class ExampleService(override val worker: CoroutineWorker) : IntervalService(Duration.ofSeconds(1)){
override fun process() {
println("${Date().toInstant()} : Hello World from worker ${worker.workerID}")
}
}This ExampleService is an IntervalService, one of several available service types. This one runs its process() function on the requested interval.
fun main(args: Array<String>) {
val workerCount = Runtime.getRuntime().availableProcessors()
val app = ExampleApplication(workerCount)
app.start()
}Finally, we'll instantiate the application, and start it. Since the workerCount here is defined by the number of available processors, on a dual core machine this would produce output similar to : v
2017-09-14T02:41:47.734Z : Hello World from worker 1
2017-09-14T02:41:47.734Z : Hello World from worker 2
...
2017-09-14T02:41:48.734Z : Hello World from worker 2
2017-09-14T02:41:48.734Z : Hello World from worker 1
...
2017-09-14T02:41:49.734Z : Hello World from worker 2
2017-09-14T02:41:49.734Z : Hello World from worker 1
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Copyright 2017 Pronghorn Technology LLC
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.