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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
// This file is placed in different package to make sure all of these components work well
// when they are outside of org.apache.spark.
package other.supplier
import java.nio.ByteBuffer
import scala.collection.mutable
import scala.reflect.ClassTag
import org.apache.spark.SparkConf
import org.apache.spark.deploy.master._
import org.apache.spark.serializer.Serializer
class CustomRecoveryModeFactory(
conf: SparkConf,
serializer: Serializer
) extends StandaloneRecoveryModeFactory(conf, serializer) {
CustomRecoveryModeFactory.instantiationAttempts += 1
/**
* PersistenceEngine defines how the persistent data(Information about worker, driver etc..)
* is handled for recovery.
*
*/
override def createPersistenceEngine(): PersistenceEngine =
new CustomPersistenceEngine(serializer)
/**
* Create an instance of LeaderAgent that decides who gets elected as master.
*/
override def createLeaderElectionAgent(master: LeaderElectable): LeaderElectionAgent =
new CustomLeaderElectionAgent(master)
}
object CustomRecoveryModeFactory {
@volatile var instantiationAttempts = 0
}
class CustomPersistenceEngine(serializer: Serializer) extends PersistenceEngine {
val data = mutable.HashMap[String, Array[Byte]]()
CustomPersistenceEngine.lastInstance = Some(this)
/**
* Defines how the object is serialized and persisted. Implementation will
* depend on the store used.
*/
override def persist(name: String, obj: Object): Unit = {
CustomPersistenceEngine.persistAttempts += 1
val serialized = serializer.newInstance().serialize(obj)
val bytes = new Array[Byte](serialized.remaining())
serialized.get(bytes)
data += name -> bytes
}
/**
* Defines how the object referred by its name is removed from the store.
*/
override def unpersist(name: String): Unit = {
CustomPersistenceEngine.unpersistAttempts += 1
data -= name
}
/**
* Gives all objects, matching a prefix. This defines how objects are
* read/deserialized back.
*/
override def read[T: ClassTag](prefix: String): Seq[T] = {
CustomPersistenceEngine.readAttempts += 1
val results = for ((name, bytes) <- data; if name.startsWith(prefix))
yield serializer.newInstance().deserialize[T](ByteBuffer.wrap(bytes))
results.toSeq
}
}
object CustomPersistenceEngine {
@volatile var persistAttempts = 0
@volatile var unpersistAttempts = 0
@volatile var readAttempts = 0
@volatile var lastInstance: Option[CustomPersistenceEngine] = None
}
class CustomLeaderElectionAgent(val masterActor: LeaderElectable) extends LeaderElectionAgent {
masterActor.electedLeader()
}
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