README

Helping us to generate exports and process import in a memory efficient way.

Usage

TL;DR write a data Provider, transform it with a Transformer so that your Assembler can write to your persistence.

Exporting/importing is nothing more than transformation from one datasource and writing to another. So there are a few main parts that come into play Provider, Transformer, Assembler and Persister.

The Provider, this will take care of feeding the system with data. Using a generator function a file, stream, database can be read and provided in the form of DataBags, a DataBag is a simple key/value store with which the system knows how to cope.

Now each DataBag is passed through a Transformer which will create an (associative) array. This Transformer will "decide" how the output will look and decides about order of fields, available fields etc.

After transformation an Assembler will take over, this is the step that will actually create some output. This can be a line of a CSV, but, since it knows its limitations, also a combined associative array that after everything is done will compile to a JSON blob.

This Assembler step will also manage what is passed to a Persister. Which can be your own repository or one borrowed from us, such as the FilePersister, which will, in the case of CSV's, neatly write every line one after another.

License

Copyright 2016 Label305 B.V.

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.