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/*-
* ============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.runtime.instantiation;
import java.io.IOException;
import java.util.HashSet;
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.runtime.instantiation.rest.InstantiationController;
import org.onap.policy.clamp.controlloop.runtime.main.parameters.ClRuntimeParameterGroup;
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 instantiation of control loop instances,
* so only one object of this type should be built at a time.
*
* </p>
* It is effectively a singleton that is started at system start
*/
public final class InstantiationHandler extends ControlLoopHandler {
@Getter
private ControlLoopInstantiationProvider controlLoopInstantiationProvider;
/**
* Gets the InstantiationHandler.
*
* @return InstantiationHandler
*/
public static InstantiationHandler getInstance() {
return Registry.get(InstantiationHandler.class.getName());
}
/**
* Create a handler.
*
* @param controlLoopParameters the parameters for access to the database
*/
public InstantiationHandler(ClRuntimeParameterGroup controlLoopParameters) {
super(controlLoopParameters.getDatabaseProviderParameters());
}
@Override
public Set<Class<?>> getProviderClasses() {
Set<Class<?>> providerClasses = new HashSet<>();
providerClasses.add(InstantiationController.class);
return providerClasses;
}
@Override
public void startAndRegisterListeners(MessageTypeDispatcher msgDispatcher) {
// No topic communication on this handler
}
@Override
public void startAndRegisterPublishers(List<TopicSink> topicSinks) {
// No topic communication on this handler
}
@Override
public void stopAndUnregisterPublishers() {
// No topic communication on this handler
}
@Override
public void stopAndUnregisterListeners(MessageTypeDispatcher msgDispatcher) {
// No topic communication on this handler
}
@Override
public void startProviders() {
controlLoopInstantiationProvider = new ControlLoopInstantiationProvider(getDatabaseProviderParameters());
}
@Override
public void stopProviders() {
try {
controlLoopInstantiationProvider.close();
} catch (IOException e) {
throw new PfModelRuntimeException(Response.Status.INTERNAL_SERVER_ERROR, e.getMessage());
}
}
}
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