Propagate iteration cache sync threshold to LMDB store (#5502)

Author: hmottestad

core/sail/lmdb/src/main/java/org/eclipse/rdf4j/sail/lmdb/LmdbStore.java

@@ -133,6 +133,9 @@ public LmdbStore(LmdbStoreConfig config) {
 				IsolationLevels.SNAPSHOT, IsolationLevels.SERIALIZABLE);
 		setDefaultIsolationLevel(IsolationLevels.SNAPSHOT_READ);
 		config.getDefaultQueryEvaluationMode().ifPresent(this::setDefaultQueryEvaluationMode);
+		if (config.getIterationCacheSyncThreshold() > 0) {
+			setIterationCacheSyncThreshold(config.getIterationCacheSyncThreshold());
+		}
 		EvaluationStrategyFactory evalStrategyFactory = config.getEvaluationStrategyFactory();
 		if (evalStrategyFactory != null) {
 			setEvaluationStrategyFactory(evalStrategyFactory);

core/sail/lmdb/src/test/java/org/eclipse/rdf4j/sail/lmdb/config/LmdbStoreConfigTest.java

@@ -22,6 +22,8 @@
 import org.eclipse.rdf4j.model.impl.LinkedHashModel;
 import org.eclipse.rdf4j.model.util.ModelBuilder;
 import org.eclipse.rdf4j.model.util.Values;
+import org.eclipse.rdf4j.sail.lmdb.LmdbStore;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
 
@@ -65,6 +67,17 @@ void testThatLmdbStoreConfigParseAndExportValueCacheSize(final int valueCacheSiz
 
 	// TODO: Add more tests for other properties
 
+	@Test
+	void setIterationCacheSyncThresholdShouldApplyToCreatedStore() {
+		final long threshold = 42;
+		final LmdbStoreConfig config = new LmdbStoreConfig();
+		config.setIterationCacheSyncThreshold(threshold);
+
+		final LmdbStore store = new LmdbStore(config);
+
+		assertThat(store.getIterationCacheSyncThreshold()).isEqualTo(threshold);
+	}
+
 	/**
 	 * Generic method to test parsing and exporting of config properties.
 	 *