examples/scala-parallel-recommendation/customize-serving/src/main/scala/Serving.scala

/*
 * 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
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package org.apache.predictionio.examples.recommendation

import org.apache.predictionio.controller.LServing

import scala.io.Source

import org.apache.predictionio.controller.Params  // ADDED

// ADDED ServingParams to specify the blacklisting file location.
case class ServingParams(filepath: String) extends Params

class Serving(val params: ServingParams)
  extends LServing[Query, PredictedResult] {

  override
  def serve(query: Query, predictedResults: Seq[PredictedResult])
  : PredictedResult = {
    val disabledProducts: Set[String] = Source
      .fromFile(params.filepath)
      .getLines
      .toSet

    val itemScores = predictedResults.head.itemScores
    PredictedResult(itemScores.filter(ps => !disabledProducts(ps.item)))
  }
}