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from __future__ import print_function
import Pyro4
class Viewer(object):
def __init__(self):
self.markets = set()
self.symbols = set()
def start(self):
print("Shown quotes:", self.symbols)
quote_sources = {
market.name: market.quotes() for market in self.markets
}
while True:
for market, quote_source in quote_sources.items():
quote = next(quote_source) # get a new stock quote from the source
symbol, value = quote
if symbol in self.symbols:
print("{0}.{1}: {2}".format(market, symbol, value))
def find_stockmarkets():
# You can hardcode the stockmarket names for nasdaq and newyork, but it
# is more flexible if we just look for every available stockmarket.
markets = []
with Pyro4.locateNS() as ns:
for market, market_uri in ns.list(prefix="example.stockmarket.").items():
print("found market", market)
markets.append(Pyro4.Proxy(market_uri))
if not markets:
raise ValueError("no markets found! (have you started the stock markets first?)")
return markets
def main():
viewer = Viewer()
viewer.markets = find_stockmarkets()
viewer.symbols = {"IBM", "AAPL", "MSFT"}
viewer.start()
if __name__ == "__main__":
main()
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