views

Views are an abstraction that allow us to have different implementations for visualizing our barchart, linechart, etc. sinks depending on the current need. Currently supported views:

• gnuplot
• pygal

write your own

You can quite easily write your own view implementation by extending from the flume.sinks.views.base.base class and then implementing the following methods:

• render(self, chart_type, data) where the chart_type can currently be one of barchart, linechart or timechart and the data is a dictionary that maps a series name to the (x,y) pairs that represent it.
  • linechart - the series names match to lines on the chart where the x,y values are the pairs in the list.
  • timechart - the series names match to lines on the chart where the x,y values are the pairs in the list and x is a datetime object.
  • barchart - the series names are the names of the set of bars that have a height of y for the x (may or may not be a datetime object) multiple series represent multiple bars for the same value of x.

For an example checkout the source of the gnuplot or pygal views.

The render method may be called many times with intermediate results that contain the data up to this point and the view implementation must deal with this how it sees fit such as re-rendering the whole output or simply redrawing the data that changed.