data/src/main/scala/storage/localfs/LocalFSModels.scala

/** Copyright 2014 TappingStone, Inc.
  *
  * 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 io.prediction.data.storage.localfs

import io.prediction.data.storage.Model
import io.prediction.data.storage.Models

import grizzled.slf4j.Logging

import scala.io.Source

import java.io.File
import java.io.FileNotFoundException
import java.io.FileOutputStream

class LocalFSModels(f: File, prefix: String)
  extends Models with Logging {

  def insert(i: Model) = {
    try {
      val fos = new FileOutputStream(new File(f, s"${prefix}${i.id}"))
      fos.write(i.models)
      fos.close
    } catch {
      case e: FileNotFoundException => error(e.getMessage)
    }
  }

  def get(id: String) = {
    try {
      Some(Model(
        id = id,
        models = Source.fromFile(new File(f, s"${prefix}${id}"))(
          scala.io.Codec.ISO8859).map(_.toByte).toArray))
    } catch {
      case e: Throwable =>
        error(e.getMessage)
        None
    }
  }

  def delete(id: String) = {
    val m = new File(f, s"${prefix}${id}")
    if (!m.delete) error(s"Unable to delete ${m.getCanonicalPath}!")
  }
}