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Package belt
Short Description Helping you to import/export data in a memory efficient way
License
Informations about the package belt
Belt
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.