Data Recorder

Data Recorder is a small Java library that provides easy recording and playback of data.

DataRecorder

DataRecorder recorder = new DataRecorder();
recorder.recordDouble("Example Double", someObject::doubleSupplier);

When supplied with a (type)-returning method (in this example, a double-returning method), DataRecorder will record the output of that method every time record() is called. The recorded data can be accessed via getRecords() or getRecorderByName(), e.g. recorder.getRecorderByName(DataType.Double, "Example Double").

DataRecorder also provides an automatic recording system. The startRecording() method records data at a fixed rate, defined using setSamplingRate() (50 Hz default). Recording is stopped via stopRecording().

Six types of objects can be recorded: Doubles, Strings, Booleans, and Lists (java.util.List) of each.

Recorded data can be written to a CSV file via save().

DataPlayer

DataPlayer is essentially the inverse of DataRecorder.

DataPlayer player = new DataPlayer();
List<Double> data = (List<Double>) recorder.getRecorderByName(DataType.Double, "Example Double").getRecord();
player.addDoublePlayer(data, someObject::doubleConsumer);

When supplied with a List and a (type)-accepting method (in this example, a double-accepting method), DataPlayer will supply that method with the next element in the List every time play() is called. Players can be accessed via getPlayers() or getPlayerByName(), in the same way as DataRecorder.

An automatic playback system is provided through startPlayback() and stopPlayback(). The output rate is defined using setOutputRate() (50 Hz default). Playback will automatically stop once all players have finished iteration.

The same objects supported by DataRecorder are supported by DataPlayer.

Data can be read from CSV files via read(). Note: Any data read from a CSV file will be interpreted as String data. Also, after reading from a CSV, each player will need to be provided with a consuming method using Player.setOutputFunction().

player.read("data.csv");
player.getPlayerByName(DataType.String, "Example Double").setOutputFunction( s -> {
    someObject.doubleConsumer(Double.parseDouble((String) s));
    });

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This project was originally written for use in the 2018 season of the FIRST Robotics Competition, by team 6204.