Internal
The name of the channel.
Return a new identical channel, optionally initialized from a checkpoint. Can be thought of as a "restoration" from a checkpoint which is a "snapshot" of the channel's state.
Optional
checkpoint: Value[]Update the channel's value with the given sequence of updates. The order of the updates in the sequence is arbitrary. This method is called by Pregel for all channels at the end of each step. If there are no updates, it is called with an empty sequence.
Raises InvalidUpdateError if the sequence of updates is invalid. Returns True if the channel was updated, False otherwise.
if the sequence of updates is invalid.
A channel that waits until all named values are received before making the value available.
This ensures that if node N and node M both write to channel C, the value of C will not be updated until N and M have completed updating.