akkeeper.storage.zookeeper.async.ZookeeperInstanceStorage.scala Maven / Gradle / Ivy
/*
* Copyright 2017-2018 Iaroslav Zeigerman
*
* 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 akkeeper.storage.zookeeper.async
import akkeeper.common._
import akkeeper.storage._
import akkeeper.storage.zookeeper.ZookeeperClientConfig
import org.apache.zookeeper.CreateMode
import scala.concurrent.Future
import ZookeeperInstanceStorage._
import InstanceStatusJsonProtocol._
private[akkeeper] class ZookeeperInstanceStorage(config: ZookeeperClientConfig)
extends BaseZookeeperStorage with InstanceStorage.Async {
protected override val zookeeperClient =
new AsyncZookeeperClient(config, CreateMode.EPHEMERAL)
private implicit val executionContext = zookeeperClient.getExecutionContext
override def registerInstance(status: InstanceInfo): Future[InstanceId] = {
val instanceId = status.instanceId
val path = instancePath(status)
zookeeperClient
.exists(path)
.map(_ => throw RecordAlreadyExistsException(s"Instance $instanceId already exists"))
.recoverWith {
case _: RecordNotFoundException =>
zookeeperClient.create(path, toBytes(status)).map(pathToInstanceId)
}
}
override def getInstance(instanceId: InstanceId): Future[InstanceInfo] = {
zookeeperClient
.get(instanceId.containerName + "/" + instanceId.toString)
.map(fromBytes[InstanceInfo])
}
override def getInstances: Future[Seq[InstanceId]] = {
val instancesFuture = for {
containers <- zookeeperClient.children("")
} yield for {
container <- containers
} yield zookeeperClient.children(container)
instancesFuture
.flatMap(f => Future.sequence(f).map(_.flatten))
.map(_.map(pathToInstanceId))
.recover(notFoundToEmptySeq[InstanceId])
}
override def getInstancesByContainer(containerName: String): Future[Seq[InstanceId]] = {
zookeeperClient.children(containerName)
.map(_.map(pathToInstanceId))
.recover(notFoundToEmptySeq[InstanceId])
}
}
private[akkeeper] object ZookeeperInstanceStorage {
private def instancePath(status: InstanceInfo): String = {
status.containerName + "/" + status.instanceId.toString
}
private def pathToInstanceId(path: String): InstanceId = {
val split = path.split("/")
val idString = if (split.size == 1) path else split.last
InstanceId.fromString(idString)
}
}