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"""A dummy foreign data wrapper"""
from . import ForeignDataWrapper
from .utils import log_to_postgres
from logging import ERROR, DEBUG, INFO, WARNING
class StateFdw(ForeignDataWrapper):
"""A dummy foreign data wrapper.
This dummy foreign data wrapper is intended as a proof of concept of state
keeping foreign data wrappers.
It keeps an internal state as an integer, auto-incremented at each request.
"""
def __init__(self, *args):
super(StateFdw, self).__init__(*args)
self.state = 0
def execute(self, quals, columns):
self.state += 1
yield [self.state]