Function: Advanced GET Operation with Cache

    March 16, 2025
    + 12

    Perform the Advanced GET operation with cache where Eventing interacts with the Data Service.

    The advancedGetOpWithCache function:

    • Performs the Advanced GET operation with an enabled bucket-backed cache

    • Requires Eventing Storage (or a metadata collection) and a source collection

    • Requires a binding of type bucket alias

    • Operates on any mutation where doc.type === "test_adv_get"

    • Has an optional parameter to couchbase.get called { "cache": true }, which enables caching of documents for up to 1 second

    For more information about the Advanced Self-Recursion Parameter, see Optional { "cache": true } Parameter.

    javascript
    // Configure the settings for the advancedGetOpWithCache function as follows: // // Version 7.1+ // "Function Scope" // *.* (or try bulk.data if non-privileged) // Version 7.0.2+ // "Listen to Location" // bulk.data.source // "Eventing Storage" // rr100.eventing.metadata // Binding(s) // 1. "binding type", "alias name...", "bucket.scope.collection", "Access" // "bucket alias", "src_col", "bulk.data.source", "read and write" function OnUpdate(doc, meta) { // filter out non-intersting documents if (!doc.type || doc.type !== "test_adv_get") return; log('input doc ', doc); log('input meta', meta); // let's read the same item and then try to read a non existent item var meta_ary = [{"id":"test_adv_get::1"}, {"id":"not_present::1"}]; for (var i = 0; i < meta_ary.length; i++) { var result = couchbase.get(src_col,meta_ary[i],{"cache": true}); if (result.success) { log('success adv. get with cache: result',result); } else { log('failure adv. get with cache: id',meta_ary[i].id,'result',result); } } }