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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2021, 2023 Nordix Foundation.
* Modifications Copyright (C) 2021 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.models.provider.impl;
import jakarta.ws.rs.core.Response;
import java.io.Closeable;
import lombok.Getter;
import lombok.NonNull;
import org.onap.policy.models.base.PfModelException;
import org.onap.policy.models.dao.PfDao;
import org.onap.policy.models.provider.PolicyModelsProviderParameters;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class provides an abstract models provider that can be used to initialise the database for any specialisation of
* the class.
*/
public abstract class AbstractModelsProvider implements Closeable {
private static final Logger LOGGER = LoggerFactory.getLogger(AbstractModelsProvider.class);
private final PolicyModelsProviderParameters parameters;
// Database connection and the DAO for reading and writing Policy Framework concepts
@Getter
private PfDao pfDao;
/**
* Constructor that takes the parameters.
*
* @param parameters the parameters for the provider
*/
protected AbstractModelsProvider(@NonNull final PolicyModelsProviderParameters parameters) {
this.parameters = parameters;
}
/**
* Initialise the provider.
*
* @throws PfModelException in initialisation errors
*/
public synchronized void init() throws PfModelException {
LOGGER.debug("opening the database connection to {} using persistence unit {}", parameters.getDatabaseUrl(),
parameters.getPersistenceUnit());
if (pfDao != null) {
var errorMessage = "provider is already initialized";
throw new PfModelException(Response.Status.NOT_ACCEPTABLE, errorMessage);
}
pfDao = ModelsProvider.init(parameters);
}
@Override
public synchronized void close() {
LOGGER.debug("closing the database connection to {} using persistence unit {}", parameters.getDatabaseUrl(),
parameters.getPersistenceUnit());
if (pfDao != null) {
pfDao.close();
pfDao = null;
}
LOGGER.debug("closed the database connection to {} using persistence unit {}", parameters.getDatabaseUrl(),
parameters.getPersistenceUnit());
}
}
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