Import Status

Quick Reference

Import status tells you what operations were applied and what’s pending due to missing dependencies. Essential for handling out-of-order updates in distributed systems.

Status Structure


interface ImportStatus {
  : PeerVersionRange;  // What was applied
  ?: PeerVersionRange; // What needs dependencies
}
 
interface PeerVersionRange {
  [: `${number}`]: {
    : number; // Inclusive
    : number;   // Exclusive (e.g., 0-50 = ops 0-49)
  };
}

Pending Operations

Operations become pending when they depend on missing operations (causal dependencies).

Common Scenario: Out-of-Order Delivery


const  = new ();
 
// Peer A creates ops 0-4, then 5-10
const  = new ();
.("text").(0, "Hello");
const  = .({ : "update" });
 
.("text").(5, " World");
const  = .({ : "update", : .() });
 
// If update2 arrives first:
const  = .();
.(.); // Ops 10-19 pending, need 0-9
 
// Import missing dependencies:
.(); // Both updates now applied

Handling Pending Operations


async function (
  : ,
  : ,
  : (: ) => <>
) {
  const  = .();
  
  if (.) {
    const  = await (.());
    .();
  }
}

Best Practices

Always Check Status


const  = new ();
const  = .();
if (.) {
  .("Operations pending:", .);
  // Fetch missing updates
}

Use Batch Import


const : [] = [
  //...
];
const  = new ();
const  = .();
// Single status check for all updates

Version Vector - Understanding version vectors
Synchronization Guide - Complete sync patterns
PeerID Management - How peer IDs affect import