RefDataStore getOnHeapRefDataStore() {

        // on demand creation of a RefDataStore for this pipeline scope
        if (onHeapRefDataStore == null) {
            onHeapRefDataStore = refDataStoreFactory.createOnHeapStore();
        }
        return onHeapRefDataStore;
    }
Gets a pipeline scoped on-heap store for storing transient context data for the life
of the pipeline process.
stroom-pipeline/src/main/java/stroom/pipeline/refdata/RefDataStoreHolder.java