GH-4899 Use the collection factory provided sets and queues in path

iterations

Author: JervenBolleman

core/collection-factory/mapdb3/src/main/java/org/eclipse/rdf4j/collection/factory/mapdb/MapDb3CollectionFactory.java

@@ -184,9 +184,9 @@ public <T> Set<T> createSet() {
 		if (iterationCacheSyncThreshold > 0) {
 			init();
 			Serializer<T> serializer = createAnySerializer();
-			MemoryTillSizeXSet<T> set = new MemoryTillSizeXSet<T>(colectionId++, delegate.createSet(), serializer,
+			MemoryTillSizeXSet<T> set = new MemoryTillSizeXSet<>(colectionId++, delegate.createSet(), serializer,
 					DEFAULT_SWITCH_TO_DISK_BASED_SET_AT_SIZE);
-			return new CommitingSet<T>(set, iterationCacheSyncThreshold, db);
+			return new CommitingSet<>(set, iterationCacheSyncThreshold, db);
 		} else {
 			return delegate.createSet();
 		}
@@ -199,7 +199,7 @@ public Set<Value> createValueSet() {
 			Serializer<Value> serializer = createValueSerializer();
 			Set<Value> set = new MemoryTillSizeXSet<>(colectionId++, delegate.createValueSet(), serializer,
 					DEFAULT_SWITCH_TO_DISK_BASED_SET_AT_SIZE);
-			return new CommitingSet<Value>(set, iterationCacheSyncThreshold, db);
+			return new CommitingSet<>(set, iterationCacheSyncThreshold, db);
 		} else {
 			return delegate.createValueSet();
 		}

core/queryalgebra/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/iterator/PathIteration.java

@@ -14,6 +14,7 @@
 import java.util.Queue;
 import java.util.Set;
 
+import org.eclipse.rdf4j.collection.factory.api.CollectionFactory;
 import org.eclipse.rdf4j.common.iteration.CloseableIteration;
 import org.eclipse.rdf4j.common.iteration.LookAheadIteration;
 import org.eclipse.rdf4j.model.Value;
@@ -68,6 +69,8 @@ public class PathIteration extends LookAheadIteration<BindingSet> {
 
 	private final Set<String> namedIntermediateJoins = new HashSet<>();
 
+	private final CollectionFactory collectionFactory;
+
 	public PathIteration(EvaluationStrategy strategy, Scope scope, Var startVar,
 			TupleExpr pathExpression, Var endVar, Var contextVar, long minLength, BindingSet bindings)
 			throws QueryEvaluationException {
@@ -85,9 +88,10 @@ public PathIteration(EvaluationStrategy strategy, Scope scope, Var startVar,
 		this.currentLength = minLength;
 		this.bindings = bindings;
 
-		this.reportedValues = strategy.makeSet();
-		this.unreportedValues = strategy.makeSet();
-		this.valueQueue = strategy.makeQueue();
+		collectionFactory = strategy.getCollectionFactory().get();
+		this.reportedValues = collectionFactory.createSet();
+		this.unreportedValues = collectionFactory.createSet();
+		this.valueQueue = collectionFactory.createQueue();
 
 		createIteration();
 	}
@@ -218,7 +222,7 @@ protected void handleClose() throws QueryEvaluationException {
 		if (currentIter != null) {
 			currentIter.close();
 		}
-
+		collectionFactory.close();
 	}
 
 	/**