resolve-local-event-broker/es/publisher-server/core/check-cursor-edge.js

The reSolve framework's event broker for applications on a local machine.

const checkCursorEdge = (events, cursor) => {
  const cursorBuffer = cursor != null ? Buffer.from(cursor, 'base64') : Buffer.alloc(1536, 0);
  const vectorConditions = [];

  for (let i = 0; i < cursorBuffer.length / 6; i++) {
    vectorConditions.push(cursorBuffer.slice(i * 6, (i + 1) * 6).toString('hex'));
  }

  for (const event of events) {
    const {
      threadId,
      threadCounter
    } = event;
    const cursorThreadCounter = parseInt(vectorConditions[threadId], 16);

    if (threadCounter < cursorThreadCounter) {
      return false;
    }
  }

  return true;
};

export default checkCursorEdge;
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