1 files changed, 82 insertions, 0 deletions
diff --git a/participant/participant-impl/participant-impl-dcae/src/main/java/org/onap/policy/clamp/controlloop/participant/dcae/main/handler/DcaeHandler.java b/participant/participant-impl/participant-impl-dcae/src/main/java/org/onap/policy/clamp/controlloop/participant/dcae/main/handler/DcaeHandler.java
new file mode 100644
index 000000000..1963e38b1
--- /dev/null
+++ b/participant/participant-impl/participant-impl-dcae/src/main/java/org/onap/policy/clamp/controlloop/participant/dcae/main/handler/DcaeHandler.java
@@ -0,0 +1,82 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.clamp.controlloop.participant.dcae.main.handler;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import javax.ws.rs.core.Response;
+import lombok.Getter;
+import org.onap.policy.clamp.controlloop.common.handler.ControlLoopHandler;
+import org.onap.policy.clamp.controlloop.participant.dcae.main.parameters.ParticipantDcaeParameters;
+import org.onap.policy.common.endpoints.event.comm.TopicSink;
+import org.onap.policy.common.endpoints.listeners.MessageTypeDispatcher;
+import org.onap.policy.common.utils.services.Registry;
+import org.onap.policy.models.base.PfModelRuntimeException;
+
+/**
+ * This class handles dcae of participants and control loop elements.
+ *
+ * </p>
+ * It is effectively a singleton that is started at system start.
+ */
+public class DcaeHandler extends ControlLoopHandler {
+
+    private final ParticipantDcaeParameters parameters;
+    @Getter
+    private DcaeProvider dcaeProvider;
+
+    /**
+     * Create a handler.
+     *
+     * @param parameters the parameters for access to the database
+     */
+    public DcaeHandler(ParticipantDcaeParameters parameters) {
+        super(parameters.getDatabaseProviderParameters());
+        this.parameters = parameters;
+    }
+
+    public static DcaeHandler getInstance() {
+        return Registry.get(DcaeHandler.class.getName());
+    }
+
+    @Override
+    public Set<Class<?>> getProviderClasses() {
+        return Collections.emptySet();
+    }
+
+    @Override
+    public void startProviders() {
+        dcaeProvider = new DcaeProvider(parameters);
+    }
+
+    @Override
+    public void stopProviders() {
+        try {
+            dcaeProvider.close();
+        } catch (IOException e) {
+            throw new PfModelRuntimeException(Response.Status.INTERNAL_SERVER_ERROR, e.getMessage());
+        } finally {
+            dcaeProvider = null;
+        }
+    }
+}