"""The Landscape monitor plugin system."""

import os

from landscape.broker.client import BrokerClient


class Monitor(BrokerClient):
"""The central point of integration in the Landscape monitor."""

name = "monitor"

def __init__(self, reactor, config, persist, persist_filename=None,
step_size=5 * 60):
super(Monitor, self).__init__(reactor)
self.reactor = reactor
self.config = config
self.persist = persist
self.persist_filename = persist_filename
if persist_filename and os.path.exists(persist_filename):
self.persist.load(persist_filename)
self._plugins = []
self.step_size = step_size
self.reactor.call_every(self.config.flush_interval, self.flush)

def flush(self):
"""Flush data to disk."""
if self.persist_filename:
self.persist.save(self.persist_filename)

def exchange(self):
"""Call C{exchange} on all plugins."""
super(Monitor, self).exchange()
self.flush()