1 files changed, 47 insertions, 0 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/services/OrderedService.java b/utils/src/main/java/org/onap/policy/common/utils/services/OrderedService.java
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+++ b/utils/src/main/java/org/onap/policy/common/utils/services/OrderedService.java
@@ -0,0 +1,47 @@
+/*
+ * ============LICENSE_START=======================================================
+ * utils
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.utils.services;
+
+/**
+ * This is a base interface that is used to control the order of a list
+ * of services (features) discovered via 'ServiceLoader'. See
+ * 'OrderedServiceImpl' for more details.
+ */
+@FunctionalInterface
+public interface OrderedService {
+    /**
+     * Get sequence number.
+     *
+     * @return an integer sequence number, which determines the order of a list
+     *     of objects implementing this interface
+     */
+    public int getSequenceNumber();
+
+
+    /**
+     * Get the name.
+     *
+     * @return the name of the ordered service
+     */
+    public default String getName() {
+        return this.getClass().getName();
+    }
+}