#!/usr/bin/env bash

#
# 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.
#

if [ -z "${SPARK_HOME}" ]; then
  export SPARK_HOME="$(cd "`dirname "$0"`"/..; pwd)"
fi

EXAMPLES_DIR="${SPARK_HOME}"/examples

. "${SPARK_HOME}"/bin/load-spark-env.sh

if [ -n "$1" ]; then
  EXAMPLE_CLASS="$1"
  shift
else
  echo "Usage: ./bin/run-example <example-class> [example-args]" 1>&2
  echo "  - set MASTER=XX to use a specific master" 1>&2
  echo "  - can use abbreviated example class name relative to com.apache.spark.examples" 1>&2
  echo "     (e.g. SparkPi, mllib.LinearRegression, streaming.KinesisWordCountASL)" 1>&2
  exit 1
fi

if [ -f "${SPARK_HOME}/RELEASE" ]; then
  JAR_PATH="${SPARK_HOME}/lib"
else
  JAR_PATH="${EXAMPLES_DIR}/target/scala-${SPARK_SCALA_VERSION}"
fi

JAR_COUNT=0

for f in "${JAR_PATH}"/spark-examples-*hadoop*.jar; do
  if [[ ! -e "$f" ]]; then
    echo "Failed to find Spark examples assembly in ${SPARK_HOME}/lib or ${SPARK_HOME}/examples/target" 1>&2
    echo "You need to build Spark before running this program" 1>&2
    exit 1
  fi
  SPARK_EXAMPLES_JAR="$f"
  JAR_COUNT=$((JAR_COUNT+1))
done

if [ "$JAR_COUNT" -gt "1" ]; then
  echo "Found multiple Spark examples assembly jars in ${JAR_PATH}" 1>&2
  ls "${JAR_PATH}"/spark-examples-*hadoop*.jar 1>&2
  echo "Please remove all but one jar." 1>&2
  exit 1
fi

export SPARK_EXAMPLES_JAR

EXAMPLE_MASTER=${MASTER:-"local[*]"}

if [[ ! $EXAMPLE_CLASS == org.apache.spark.examples* ]]; then
  EXAMPLE_CLASS="org.apache.spark.examples.$EXAMPLE_CLASS"
fi

exec "${SPARK_HOME}"/bin/spark-submit \
  --master $EXAMPLE_MASTER \
  --class $EXAMPLE_CLASS \
  "$SPARK_EXAMPLES_JAR" \
  "$@"