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Function: Advanced GET operation (with cache)

    March 16, 2025
    + 12

    Couchbase Server 7.0.2 Goal: Perform the Advanced GET operation where Eventing interacts with the Data service.

    • This function advancedGetOpWithCache merely demonstrates the Advanced GET operation with Bucket Backed Cache enabled.

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

    • Needs a Binding of type "bucket alias" (as documented in the Scriptlet).

    • Will operate on any mutation where doc.type === "test_adv_get".

    • The optional third parameter to couchbase.get of {"cache": true} enables caching of documents for up to 1 second.

    • This RYOW caching is 18X-25X faster than reading near static data directly from the Data Service (or KV).

    • For more information refer to Advanced GET operation in the detailed documentation.

    javascript
    Copy
    // To run configure the settings for this Function, advancedGetOpWithCache, as follows:
//
// 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);
        }
    }
}