Merge pull request #742 from hapifhir/expose-search-prefetch-thresholds

Expose Setting for prefetch thresholds

src/main/java/ca/uhn/fhir/jpa/starter/AppProperties.java

@@ -105,6 +105,8 @@ public class AppProperties {
 	private final List<String> custom_provider_classes = new ArrayList<>();
 	private Boolean upliftedRefchains_enabled = false;
 
+	private List<Integer> search_prefetch_thresholds = new ArrayList<>();
+
 
 	public List<String> getCustomInterceptorClasses() {
     return custom_interceptor_classes;
@@ -644,6 +646,14 @@ public Cors getCors() {
 		this.language_search_parameter_enabled = language_search_parameter_enabled;
 	}
 
+	public List<Integer> getSearch_prefetch_thresholds() {
+		return this.search_prefetch_thresholds;
+	}
+
+	public void  setSearch_prefetch_thresholds(List<Integer> thePrefetchThresholds) {
+		this.search_prefetch_thresholds = thePrefetchThresholds;
+	}
+
 	public boolean getUpliftedRefchains_enabled() {
 		return upliftedRefchains_enabled;
 	}

src/main/java/ca/uhn/fhir/jpa/starter/common/FhirServerConfigCommon.java

@@ -152,6 +152,10 @@ public class FhirServerConfigCommon {
 		jpaStorageSettings.setIndexOnUpliftedRefchains(appProperties.getUpliftedRefchains_enabled());
 
 
+		if (!appProperties.getSearch_prefetch_thresholds().isEmpty()) {
+			jpaStorageSettings.setSearchPreFetchThresholds(appProperties.getSearch_prefetch_thresholds());
+		}
+
 		Integer maxFetchSize = appProperties.getMax_page_size();
 		jpaStorageSettings.setFetchSizeDefaultMaximum(maxFetchSize);
 		ourLog.info("Server configured to have a maximum fetch size of "

src/main/resources/application.yaml

@@ -237,6 +237,17 @@ hapi:
     search-coord-max-pool-size: 100
     search-coord-queue-capacity: 200
 
+    # Search Prefetch Thresholds.
+
+    # This setting sets the number of search results to prefetch. For example, if this list
+    # is set to [100, 1000, -1] then the server will initially load 100 results and not
+    # attempt to load more. If the user requests subsequent page(s) of results and goes
+    # past 100 results, the system will load the next 900 (up to the following threshold of 1000).
+    # The system will progressively work through these thresholds.
+    # A threshold of -1 means to load all results. Note that if the final threshold is a
+    # number other than -1, the system will never prefetch more than the given number.
+    search_prefetch_thresholds: 13,503,2003,-1
+
     # comma-separated package names, will be @ComponentScan'ed by Spring to allow for creating custom Spring beans
     #custom-bean-packages: