Initial commit

Signed-off-by: Vassilis Vassiliadis <vassilis.vassiliadis@ibm.com>

.github/dco.yml

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+# This enables DCO bot for you, please take a look https://github.com/probot/dco
+# for more details.
+require:
+  members: false

CONTRIBUTING.md

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+## Contributing In General
+Our project welcomes external contributions. If you have an itch, please feel
+free to scratch it.
+
+To contribute code or documentation, please submit a [pull request](https://github.com/st4sd/st4sd-datastore/pulls).
+
+A good way to familiarize yourself with the codebase and contribution process is
+to look for and tackle low-hanging fruit in the [issue tracker](https://github.com/st4sd/st4sd-datastore/issues).
+Before embarking on a more ambitious contribution, please quickly [get in touch](MAINTAINERS.md) with us.
+
+**Note: We appreciate your effort, and want to avoid a situation where a contribution
+requires extensive rework (by you or by us), sits in backlog for a long time, or
+cannot be accepted at all!**
+
+### Proposing new features
+
+If you would like to implement a new feature, please [raise an issue](https://github.com/st4sd/st4sd-datastore/issues)
+before sending a pull request so the feature can be discussed. This is to avoid
+you wasting your valuable time working on a feature that the project developers
+are not interested in accepting into the code base.
+
+### Fixing bugs
+
+If you would like to fix a bug, please [raise an issue](https://github.com/st4sd/st4sd-datastore/issues) before sending a
+pull request so it can be tracked.
+
+### Merge approval
+
+The project maintainers use LGTM (Looks Good To Me) in comments on the code
+review to indicate acceptance. A change requires LGTMs from two of the
+maintainers of each component affected.
+
+For a list of the maintainers, see the [MAINTAINERS.md](MAINTAINERS.md) page.
+
+## Legal
+
+Each source file must include a license header for the Apache
+Software License 2.0. Using the SPDX format is the simplest approach.
+e.g.
+
+```
+/*
+Copyright IBM Inc. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+```
+
+We have tried to make it as easy as possible to make contributions. This
+applies to how we handle the legal aspects of contribution. We use the
+same approach - the [Developer's Certificate of Origin 1.1 (DCO)](https://github.com/hyperledger/fabric/blob/master/docs/source/DCO1.1.txt) - that the Linux® Kernel [community](https://elinux.org/Developer_Certificate_Of_Origin)
+uses to manage code contributions.
+
+We simply ask that when submitting a patch for review, the developer
+must include a sign-off statement in the commit message.
+
+Here is an example Signed-off-by line, which indicates that the
+submitter accepts the DCO:
+
+```
+Signed-off-by: John Doe <john.doe@example.com>
+```
+
+You can include this automatically when you commit a change to your
+local git repository using the following command:
+
+```
+git commit -s
+```

LICENSE.md

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+   See the License for the specific language governing permissions and
+   limitations under the License.

MAINTAINERS.md

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+# MAINTAINERS
+
+Following is the current list of maintainers on this project
+
+The maintainers are listed in alphabetical order.
+
+- Michael Johnston ([michael-johnston](https://github.com/michael-johnston))
+- Alessandro Pomponio ([AlessandroPomponio](https://github.com/AlessandroPomponio))
+- Edward Pyzer-Knapp ([epyzerk3](https://github.com/epyzerk3))
+- Vassilis Vassiliadis ([VassilisVassiliadis](https://github.com/VassilisVassiliadis))

README.md

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+# ST4SD Example: Sum numbers
+
+Toy example demonstrating the most common features of our virtual experiment Domain Specific Language (DSL) `FlowIR`.
+We recommend using this source code to follow along with our [sum numbers tutorial](https://st4sd.github.io/overview/tutorial/).
+
+For more information on FlowIR visit our [FlowIR documentation website](https://st4sd.github.io/overview/workflow-specification/).
+
+## Quick links
+
+- [Getting started](#getting-started)
+- [Development](#development)
+- [Help and Support](#help-and-support)
+- [Contributing](#contributing)
+- [License](#license)
+
+## Getting started
+
+#### Python
+
+Running and developing this project requires a recent Python version, it is suggested to use Python 3.7 or above. You
+can find instructions on how to install Python on the [official website](https://www.python.org/downloads/).
+
+#### Python module st4sd-runtime-core
+
+Create a python 3.7+ and install the python module `st4sd-runtime-core` in it.
+For more information, see the installation instructions of [st4sd-runtime-core](https://github.com/st4sd/st4sd-runtime-core).
+
+#### Executing the example
+
+Instructions below assume that your python 3.7 virtual environment is under `${HOME}/venvs/st4sd`
+
+```bash
+git clone http://github.com/st4sd/sum-numbers.git
+source ${HOME}/venvs/st4sd/bin/activate
+
+# Delete the previous runs if it exists
+rm -rf sum-numbers.instance
+elaunch.py sum-numbers --nostamp
+```
+
+After the virtual experiment terminates, you should have a look inside the `sum-numbers.instance` directory. 
+For more information see our [sum-numbers tutorial](https://st4sd.github.io/overview/tutorial/).
+
+## Development
+
+Coming soon.
+
+## Help and Support
+
+Please feel free to reach out to one of the maintainers listed in the [MAINTAINERS.md](MAINTAINERS.md) page.
+
+## Contributing 
+
+We always welcome external contributions. Please see our [guidance](CONTRIBUTING.md) for details on how to do so.
+
+## License
+
+This project is licensed under the Apache 2.0 license. Please [see details here](LICENSE.md).

bin/extract_row.py

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+#! /usr/bin/env python
+
+# Copyright IBM Inc. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+# Authors:
+#  Vassilis Vassiliadis
+
+
+from __future__ import print_function
+import sys
+
+file_path = sys.argv[1]
+row_idx = int(sys.argv[2])
+
+with open(file_path, 'r') as f:
+    for row in range(row_idx):
+        f.readline()
+    line = f.readline().strip()
+
+if len(line) == 0:
+    raise ValueError("Could not fetch row %d from file %s" % (row_idx, file_path))
+
+print(line)

bin/generate_input_file.py

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+#! /usr/bin/env python
+
+# Copyright IBM Inc. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+# Authors:
+#  Vassilis Vassiliadis
+
+from __future__ import print_function
+import sys
+import random
+
+num_rows = int(sys.argv[1])
+
+if len(sys.argv) == 3:
+    print("Seeding with %s" % sys.argv[2])
+    random.seed(int(sys.argv[2]))
+
+with open('output.csv', 'w') as f:
+    for row in range(num_rows):
+        line = ' '.join(map(str, [random.randint(0, 10), random.randint(0, 10)]))
+        f.write(line + '\n')
+
+print("Generated %d rows" % num_rows)