composed_logger.yaml

# A sample file for logger/listener/listen.py demonstrating the recursive
# definition functionality by using a ComposedReader or ComposedWriter.
#
# To run, type:
#
#    logger/listener/listen.py --config_file test/configs/composed_logger.yaml
#
# Dictionary key/value pairs are used as keyword arguments for creating a
# Listener. The keys "reader", "transform" and "writer" are special-cased to
# indicate that the respective entities should be instantiated (recursively,
# if necessary).

readers:
- class: TextFileReader   # multiple readers, so enclose in a list.
  kwargs:
    file_spec: README.md  # initialization keyword args
    interval: 0.5
- class: ComposedReader
  kwargs:
    readers:
      class: TextFileReader
      kwargs:
        file_spec: LICENSE
        interval: 1
    transforms:
      class: PrefixTransform
      kwargs:
        prefix: 'composed:'

#transforms:  # No transforms, so omit entirely

# Only a single writer, not enclosed in a list, to demonstrate/test
# that lists are only needed if we've got multiple components.
writers:
  class: TextFileWriter
  # no kwargs; no filename provided, so will write to stdout