val open: Boolean
    val cancel: Boolean
    withLock {
      cancel = !source.finished && source.closed && (sink.finished || sink.closed)
      open = isOpen
    }
    if (cancel) {
      // RST this stream to prevent additional data from being sent. This is safe because the input
      // stream is closed (we won't use any further bytes) and the output stream is either finished

	// ResyncBeforeDate - resync all objects created prior to this date
	ResyncBeforeDate time.Time `json:"resyncBeforeDate" msg:"rdt"`
	// Status of resync operation
	ResyncStatus ResyncStatusType `json:"resyncStatus" msg:"rst"`
	// Failed size in bytes
	FailedSize int64 `json:"failedReplicationSize"  msg:"fs"`
	// Total number of failed operations
	FailedCount int64 `json:"failedReplicationCount"  msg:"frc"`
	// Completed size in bytes