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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.
*/
package org.apache.spark.util
import java.io.{Externalizable, ObjectOutput, ObjectInput}
import com.clearspring.analytics.stream.cardinality.{ICardinality, HyperLogLog}
/**
* A wrapper around [[com.clearspring.analytics.stream.cardinality.HyperLogLog]] that is serializable.
*/
private[spark]
class SerializableHyperLogLog(var value: ICardinality) extends Externalizable {
def this() = this(null) // For deserialization
def merge(other: SerializableHyperLogLog) = new SerializableHyperLogLog(value.merge(other.value))
def add[T](elem: T) = {
this.value.offer(elem)
this
}
def readExternal(in: ObjectInput) {
val byteLength = in.readInt()
val bytes = new Array[Byte](byteLength)
in.readFully(bytes)
value = HyperLogLog.Builder.build(bytes)
}
def writeExternal(out: ObjectOutput) {
val bytes = value.getBytes()
out.writeInt(bytes.length)
out.write(bytes)
}
}
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