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require "spring/watcher/abstract"
module Spring
module Watcher
class Polling < Abstract
attr_reader :mtime
def initialize(root, latency)
super
@mtime = 0
@poller = nil
end
def check_stale
synchronize do
computed = compute_mtime
if mtime < computed
debug { "check_stale: mtime=#{mtime.inspect} < computed=#{computed.inspect}" }
mark_stale
end
end
end
def add(*)
check_stale if @poller
super
end
def start
debug { "start: poller=#{@poller.inspect}" }
unless @poller
@poller = Thread.new {
Thread.current.abort_on_exception = true
begin
until stale?
Kernel.sleep latency
check_stale
end
rescue Exception => e
debug do
"poller: aborted: #{e.class}: #{e}\n #{e.backtrace.join("\n ")}"
end
raise
ensure
@poller = nil
end
}
end
end
def stop
debug { "stopping poller: #{@poller.inspect}" }
if @poller
@poller.kill
@poller = nil
end
end
def running?
@poller && @poller.alive?
end
def subjects_changed
computed = compute_mtime
debug { "subjects_changed: mtime #{@mtime} -> #{computed}" }
@mtime = computed
end
private
def compute_mtime
expanded_files.map do |f|
# Get the mtime of symlink targets. Ignore dangling symlinks.
if File.symlink?(f)
begin
File.mtime(f)
rescue Errno::ENOENT
0
end
# If a file no longer exists, treat it as changed.
else
begin
File.mtime(f)
rescue Errno::ENOENT
debug { "compute_mtime: no longer exists: #{f}" }
Float::MAX
end
end.to_f
end.max || 0
end
def expanded_files
files + Dir["{#{directories.map { |d| "#{d}/**/*" }.join(",")}}"]
end
end
end
end
|
