Parser from disk but not from fetcher

[Exerosis]

It would be very useful if one could get results from an API: eg. Stock stock = YahooFinance.get("NVDA"); Then persist that to disk using SourcePersisterFactory as a Json, then parse the result as it comes back from the disk.

[digitalbuddha]

Currently the file system impelentation needs a stream from network. As a result SourcePersisterFactory cannot work with an input of a scalar value like Stock. What you can do is write your own persister which can still use the FileSystem, within your read/write impelentation you can do the conversion from your data type to a BufferedSource. Use the SourcePersisterFactory as an example (there should be a test for it which shows how to create a bufferedsource from a string)

You're also free to create a new middleware for this and we will merge it in. ☺️

Alternatively you can use your own persister without our file system and write a persister implementation that can work with an input/output of Stock.

[pavlospt]

Just a small note here, if you are using GSON you can very easily convert your Stock object to a BufferedSource.

Buffer buffer = new Buffer();
Gson gson = new Gson();
buffer.write(gson.toJson(yourObjectGoesHere).getBytes());
buffer.flush();
buffer.close();

[digitalbuddha]

one more helper method how to go from a string to a bufferedsource

private static BufferedSource source(String data) {
        return Okio.buffer(Okio.source(new ByteArrayInputStream(data.getBytes(UTF_8))));
    }