Creating and Modifying Counters

void increment(String counterName);
void increment(String counterName, long incrementValue);

• Flow:

  • Open a session
  • Create an instance of countersFor.
    • Either pass countersFor an explicit document ID, -or-
    • Pass it an entity tracked by the session, e.g. a document object returned from session.query or from session.load.
  • Execute countersFor.increment
  • Execute session.saveChanges for the changes to take effect

• Note:

  • Modifying a Counter using increment only takes effect when session.saveChanges() is executed.
  • To decrease a Counter's value, pass the method a negative number to increment.
    

// 1. Open a session
try (IDocumentSession session = docStore.openSession()) {
    // 2. pass CountersFor's constructor a document ID
    ISessionDocumentCounters documentCounters = session.countersFor("products/1-C");

    // 3. Use `countersFor.increment`
    documentCounters.increment("productLikes");  // Increase "productLikes" by 1, or create it with a value of 1
    documentCounters.increment("productDislikes", 1); // Increase "productDislikes" by 1, or create it with a value of 1
    documentCounters.increment("productPageViews", 15); // Increase "productPageViews" by 15, or create it with a value of 15
    documentCounters.increment("daysLeftForSale", -10); // Decrease "daysLeftForSale" by 10, or create it with a value of -10

    // 4. Save changes to the session
    session.saveChanges();
}