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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2019-2020 Nordix Foundation.
* Modifications Copyright (C) 2021 Bell Canada. 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.apex.context.impl.distribution;
import org.onap.policy.apex.context.ContextException;
import org.onap.policy.apex.context.Distributor;
import org.onap.policy.apex.context.parameters.ContextParameterConstants;
import org.onap.policy.apex.context.parameters.DistributorParameters;
import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
import org.onap.policy.common.parameters.ParameterService;
import org.onap.policy.common.utils.validation.Assertions;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* This class returns a context distributor for the particular type of distribution mechanism configured for use.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class DistributorFactory {
// Get a reference to the logger
private static final XLogger LOGGER = XLoggerFactory.getXLogger(DistributorFactory.class);
/**
* Get a context distributor for a given context set key.
*
* @param key The key for the distributor
* @return a context distributor
* @throws ContextException on context distributor creation errors
*/
public Distributor getDistributor(final AxArtifactKey key) throws ContextException {
LOGGER.debug("Distributor factory, key={}", key);
Assertions.argumentOfClassNotNull(key, ContextException.class, "Parameter \"key\" may not be null");
// Get the class for the distributor using reflection
final var distributorParameters =
(DistributorParameters) ParameterService.get(ContextParameterConstants.DISTRIBUTOR_GROUP_NAME);
final String pluginClass = distributorParameters.getPluginClass();
Object contextDistributorObject = null;
try {
contextDistributorObject = Class.forName(pluginClass).getDeclaredConstructor().newInstance();
} catch (Exception e) {
throw new ContextException(
"Apex context distributor class not found for context distributor plugin \"" + pluginClass + "\"",
e);
}
// Check the class is a distributor
if (!(contextDistributorObject instanceof Distributor)) {
final var returnString = "Specified Apex context distributor plugin class \"" + pluginClass
+ "\" does not implement the ContextDistributor interface";
throw new ContextException(returnString);
}
// The context Distributor to return
final var contextDistributor = (Distributor) contextDistributorObject;
// Lock and load the context distributor
contextDistributor.init(key);
LOGGER.debug("Distributor factory, key={}, selected distributor of class {}", key,
contextDistributor.getClass());
return contextDistributor;
}
}
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