#!/usr/bin/env python
#
# pyFlow - a lightweight parallel task engine
#
# Copyright (c) 2012-2017 Illumina, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
# WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
#


#
# This demo shows possibly the simplist possible pyflow we can create --
# a single 'hello world' task. After experimenting with this file
# please see the 'simpleDemo' for coverage of a few more pyflow features
#

import os.path
import sys

# add module path
#
scriptDir=os.path.abspath(os.path.dirname(__file__))
sys.path.append(os.path.abspath(os.path.join(scriptDir,os.pardir,os.pardir,"src")))

from pyflow import WorkflowRunner


# all pyflow workflows are written into classes derived from pyflow.WorkflowRunner:
#
class HelloWorkflow(WorkflowRunner) :

    # a workflow is defined by overloading the WorkflowRunner.workflow() method:
    #
    def workflow(self) :

        #
        # The output for this task will be written to the file helloWorld.out.txt
        #
        self.addTask("easy_task1", "echo 'Hello World!' > helloWorld.out.txt")



# Instantiate the workflow
#
wflow = HelloWorkflow()

# Run the worklow:
#
retval = wflow.run()

# done!
sys.exit(retval)