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Diffstat (limited to 'ruby_2_2/lib/rake/promise.rb')
-rw-r--r-- | ruby_2_2/lib/rake/promise.rb | 99 |
1 files changed, 0 insertions, 99 deletions
diff --git a/ruby_2_2/lib/rake/promise.rb b/ruby_2_2/lib/rake/promise.rb deleted file mode 100644 index 31c4563476..0000000000 --- a/ruby_2_2/lib/rake/promise.rb +++ /dev/null @@ -1,99 +0,0 @@ -module Rake - - # A Promise object represents a promise to do work (a chore) in the - # future. The promise is created with a block and a list of - # arguments for the block. Calling value will return the value of - # the promised chore. - # - # Used by ThreadPool. - # - class Promise # :nodoc: all - NOT_SET = Object.new.freeze # :nodoc: - - attr_accessor :recorder - - # Create a promise to do the chore specified by the block. - def initialize(args, &block) - @mutex = Mutex.new - @result = NOT_SET - @error = NOT_SET - @args = args - @block = block - end - - # Return the value of this promise. - # - # If the promised chore is not yet complete, then do the work - # synchronously. We will wait. - def value - unless complete? - stat :sleeping_on, :item_id => object_id - @mutex.synchronize do - stat :has_lock_on, :item_id => object_id - chore - stat :releasing_lock_on, :item_id => object_id - end - end - error? ? raise(@error) : @result - end - - # If no one else is working this promise, go ahead and do the chore. - def work - stat :attempting_lock_on, :item_id => object_id - if @mutex.try_lock - stat :has_lock_on, :item_id => object_id - chore - stat :releasing_lock_on, :item_id => object_id - @mutex.unlock - else - stat :bailed_on, :item_id => object_id - end - end - - private - - # Perform the chore promised - def chore - if complete? - stat :found_completed, :item_id => object_id - return - end - stat :will_execute, :item_id => object_id - begin - @result = @block.call(*@args) - rescue Exception => e - @error = e - end - stat :did_execute, :item_id => object_id - discard - end - - # Do we have a result for the promise - def result? - ! @result.equal?(NOT_SET) - end - - # Did the promise throw an error - def error? - ! @error.equal?(NOT_SET) - end - - # Are we done with the promise - def complete? - result? || error? - end - - # free up these items for the GC - def discard - @args = nil - @block = nil - end - - # Record execution statistics if there is a recorder - def stat(*args) - @recorder.call(*args) if @recorder - end - - end - -end |