tree a0e3a52ac371fae85bae96651a27c0a8fbf92da6
parent 8a5726aa96d7a585dccb67d35038b8efeccfd46b
author Gary Morain <gmorain@chromium.org> 1337205424 -0700
committer Gerrit <chrome-bot@google.com> 1337280439 -0700

shill: HookTable collects async actions to be executed later

HookTable provides a facility for starting a set of generic
actions and polling for their completion.  For example, on shutdown,
each service gets disconnected.  A disconnect action may be
instantaneous or it may require some time to complete.  Users of
HookTable use the Add() function to provide a closure for starting
an action and a callback for pollings its completion.  When an event
occurs, the Run() function is called, which starts each action and
polls for completion.  Upon completion or timeout, Run() calls a
user-supplied callback to notify the caller of the state of actions.

BUG=chromium-os:22408
TEST=new unittests; ran all unittests.

Change-Id: Ia42816a2a2b3c252108665ec64bc3c68f886463b
Reviewed-on: https://gerrit.chromium.org/gerrit/22862
Commit-Ready: Gary Morain <gmorain@chromium.org>
Reviewed-by: Gary Morain <gmorain@chromium.org>
Tested-by: Gary Morain <gmorain@chromium.org>