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Utils.scala
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/
Utils.scala
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/** Copyright 2015 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
*
* https://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.controller
import io.prediction.workflow.KryoInstantiator
import org.json4s._
import org.json4s.ext.JodaTimeSerializers
import scala.io.Source
import _root_.java.io.File
import _root_.java.io.FileOutputStream
/** Controller utilities.
*
* @group General
*/
object Utils {
/** Default JSON4S serializers for PredictionIO controllers. */
val json4sDefaultFormats = DefaultFormats.lossless ++ JodaTimeSerializers.all
/** Save a model object as a file to a temporary location on local filesystem.
* It will first try to use the location indicated by the environmental
* variable PIO_FS_TMPDIR, then fall back to the java.io.tmpdir property.
*
* @param id Used as the filename of the file.
* @param model Model object.
*/
def save(id: String, model: Any): Unit = {
val tmpdir = sys.env.getOrElse("PIO_FS_TMPDIR", System.getProperty("java.io.tmpdir"))
val modelFile = tmpdir + File.separator + id
(new File(tmpdir)).mkdirs
val fos = new FileOutputStream(modelFile)
val kryo = KryoInstantiator.newKryoInjection
fos.write(kryo(model))
fos.close
}
/** Load a model object from a file in a temporary location on local
* filesystem. It will first try to use the location indicated by the
* environmental variable PIO_FS_TMPDIR, then fall back to the java.io.tmpdir
* property.
*
* @param id Used as the filename of the file.
*/
def load(id: String): Any = {
val tmpdir = sys.env.getOrElse("PIO_FS_TMPDIR", System.getProperty("java.io.tmpdir"))
val modelFile = tmpdir + File.separator + id
val src = Source.fromFile(modelFile)(scala.io.Codec.ISO8859)
val kryo = KryoInstantiator.newKryoInjection
val m = kryo.invert(src.map(_.toByte).toArray).get
src.close
m
}
}