za.co.absa.enceladus.migrations.framework.dao.ScalaMongoImplicits.scala Maven / Gradle / Ivy
/*
* Copyright 2018 ABSA Group Limited
*
* 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.
*/
package za.co.absa.enceladus.migrations.framework.dao
import java.util.concurrent.TimeUnit
import org.mongodb.scala.{FindObservable, Observable, Observer, SingleObservable}
import za.co.absa.enceladus.migrations.framework.Configuration
import scala.concurrent.duration.Duration
import scala.concurrent.{Await, Promise}
/**
* These implicits extend observables returned by Scala MongoDB driver with .execute() method
* to make synchronous calls.
*/
object ScalaMongoImplicits {
val executionTimeout = Duration(Configuration.getMongoDbTimeoutSeconds, TimeUnit.SECONDS)
implicit class ObservableExecutor[T](observable: Observable[T]) {
def execute(): Seq[T] = Await.result(observable.toFuture, executionTimeout)
}
implicit class SingleObservableExecutor[T](observable: SingleObservable[T]) {
def execute(): T = Await.result(observable.toFuture, executionTimeout)
}
implicit class FindObservableExecutor[T](observable: FindObservable[T]) {
def execute(): Seq[T] = Await.result(observable.toFuture, executionTimeout)
}
implicit class FindObservableTraversable[T](observable: FindObservable[T]) {
def syncForeach(transform: T => Unit): Unit = {
val p = Promise[Unit]()
val f = p.future
observable.subscribe(new Observer[T] {
override def onNext(result: T): Unit = transform(result)
override def onError(e: Throwable): Unit = p.failure(new RuntimeException("Error fetching MongoDB documents.", e))
override def onComplete(): Unit = p.success((): Unit)
})
// An infinite wait since processing all documents in a collection can take a long time
Await.result(f, Duration.Inf)
}
}
}