1 files changed, 61 insertions, 0 deletions
diff --git a/capabilities/src/main/java/org/onap/policy/common/capabilities/Startable.java b/capabilities/src/main/java/org/onap/policy/common/capabilities/Startable.java
new file mode 100644
index 00000000..1595272d
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+++ b/capabilities/src/main/java/org/onap/policy/common/capabilities/Startable.java
@@ -0,0 +1,61 @@
+/*
+ * ============LICENSE_START=======================================================
+ * policy-core
+ * ================================================================================
+ * Copyright (C) 2017-2018 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.capabilities;
+
+/**
+ * Interface for classes that supports start-like operations.
+ */
+public interface Startable {
+
+    /**
+     * Start operation. This operation starts the entity.
+     * 
+     * @return boolean. true if the start operation was successful, otherwise false.
+     * @throws IllegalStateException. if the element is in a state that conflicts with the start
+     *         operation.
+     */
+    public boolean start();
+
+    /**
+     * Stop operation. The entity can be restarted again by invoking the start operation.
+     * 
+     * @return boolean. true if the stop operation was successful, otherwise false.
+     * @throws IllegalStateException. if the element is in a state that conflicts with the stop
+     *         operation.
+     */
+    public boolean stop();
+
+    /**
+     * shutdown operation. The terminate operation yields the entity unusuable. It cannot be
+     * (re)started.
+     * 
+     * @throws IllegalStateException. if the element is in a state that conflicts with the stop
+     *         operation.
+     */
+    public void shutdown();
+
+    /**
+     * is it alive?
+     * 
+     * @return boolean. true if alive, otherwise false
+     */
+    public boolean isAlive();
+}