IGNITE-15404 Rework disctributed configuration flow. (#330)

modules/affinity/src/main/java/org/apache/ignite/internal/affinity/AffinityUtils.java

@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.affinity;
+
+import java.util.Collection;
+import java.util.List;
+import org.apache.ignite.network.ClusterNode;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Stateless affinity utils that produces helper methods for an affinity assignments calculation.
+ */
+public class AffinityUtils {
+    /**
+     * Calculates affinity assignments.
+     *
+     * @param partitions Partitions count.
+     * @param replicas Replicas count.
+     * @return List nodes by partition.
+     */
+    public static List<List<ClusterNode>> calculateAssignments(
+        @NotNull Collection<ClusterNode> baselineNodes,
+        int partitions,
+        int replicas
+    ) {
+        return RendezvousAffinityFunction.assignPartitions(
+            baselineNodes,
+            partitions,
+            replicas,
+            false,
+            null
+        );
+    }
+}