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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2018 Ericsson. All rights reserved.
* Copyright (C) 2019 Nordix Foundation.
* Modifications Copyright (C) 2019-2020 AT&T Intellectual Property. All rights reserved.
* 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.distribution.main.startstop;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import lombok.Getter;
import lombok.Setter;
import org.onap.policy.common.endpoints.http.server.RestServer;
import org.onap.policy.common.parameters.ParameterService;
import org.onap.policy.distribution.main.PolicyDistributionException;
import org.onap.policy.distribution.main.parameters.DistributionParameterGroup;
import org.onap.policy.distribution.main.parameters.PolicyForwarderConfigurationParameterGroup;
import org.onap.policy.distribution.main.rest.DistributionRestController;
import org.onap.policy.distribution.main.rest.aaf.AafDistributionFilter;
import org.onap.policy.distribution.reception.decoding.PluginInitializationException;
import org.onap.policy.distribution.reception.handling.AbstractReceptionHandler;
import org.onap.policy.distribution.reception.parameters.PolicyDecoderConfigurationParameterGroup;
import org.onap.policy.distribution.reception.parameters.ReceptionHandlerConfigurationParameterGroup;
import org.onap.policy.distribution.reception.parameters.ReceptionHandlerParameters;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class wraps a distributor so that it can be activated as a complete service together with all its distribution
* and forwarding handlers.
*/
public class DistributionActivator {
private static final Logger LOGGER = LoggerFactory.getLogger(DistributionActivator.class);
// The parameters of this policy distribution activator
@Getter
private final DistributionParameterGroup distributionParameterGroup;
// The map of reception handlers initialized by this distribution activator
private final Map<String, AbstractReceptionHandler> receptionHandlersMap = new HashMap<>();
@Getter
@Setter
private static boolean alive = false;
private RestServer restServer;
/**
* Instantiate the activator for policy distribution as a complete service.
*
* @param distributionParameterGroup the parameters for the distribution service
*/
public DistributionActivator(final DistributionParameterGroup distributionParameterGroup) {
this.distributionParameterGroup = distributionParameterGroup;
}
/**
* Initialize distribution as a complete service.
*
* @throws PolicyDistributionException on errors in initializing the service
*/
@SuppressWarnings("unchecked")
public void initialize() throws PolicyDistributionException {
LOGGER.debug("Policy distribution starting as a service . . .");
startDistributionRestServer();
registerToParameterService(distributionParameterGroup);
for (final ReceptionHandlerParameters receptionHandlerParameters : distributionParameterGroup
.getReceptionHandlerParameters().values()) {
try {
final Class<AbstractReceptionHandler> receptionHandlerClass = (Class<AbstractReceptionHandler>) Class
.forName(receptionHandlerParameters.getReceptionHandlerClassName());
final AbstractReceptionHandler receptionHandler =
receptionHandlerClass.getDeclaredConstructor().newInstance();
receptionHandler.initialize(receptionHandlerParameters.getName());
receptionHandlersMap.put(receptionHandlerParameters.getName(), receptionHandler);
DistributionActivator.setAlive(true);
} catch (final ClassNotFoundException | InstantiationException | IllegalAccessException
| PluginInitializationException | IllegalArgumentException | InvocationTargetException
| NoSuchMethodException | SecurityException exp) {
throw new PolicyDistributionException(exp.getMessage(), exp);
}
}
LOGGER.debug("Policy distribution started as a service");
}
/**
* Starts the distribution rest server using configuration parameters.
*
* @throws PolicyDistributionException if server start fails
*/
private void startDistributionRestServer() throws PolicyDistributionException {
distributionParameterGroup.getRestServerParameters().setName(distributionParameterGroup.getName());
restServer = new RestServer(distributionParameterGroup.getRestServerParameters(), AafDistributionFilter.class,
DistributionRestController.class);
if (!restServer.start()) {
throw new PolicyDistributionException(
"Failed to start distribution rest server. Check log for more details...");
}
}
/**
* Terminate policy distribution.
*
* @throws PolicyDistributionException on termination errors
*/
public void terminate() throws PolicyDistributionException {
try {
for (final AbstractReceptionHandler handler : receptionHandlersMap.values()) {
handler.destroy();
}
receptionHandlersMap.clear();
deregisterToParameterService(distributionParameterGroup);
DistributionActivator.setAlive(false);
// Stop the distribution rest server
restServer.stop();
} catch (final Exception exp) {
throw new PolicyDistributionException(exp.getMessage(), exp);
}
}
/**
* Method to register the parameters to Common Parameter Service.
*
* @param distributionParameterGroup the distribution parameter group
*/
public void registerToParameterService(final DistributionParameterGroup distributionParameterGroup) {
ParameterService.register(distributionParameterGroup);
for (final ReceptionHandlerParameters params : distributionParameterGroup.getReceptionHandlerParameters()
.values()) {
params.setName(distributionParameterGroup.getName());
params.getPluginHandlerParameters().setName(distributionParameterGroup.getName());
ParameterService.register(params);
ParameterService.register(params.getPluginHandlerParameters());
}
//@formatter:off
for (final Entry<String, PolicyForwarderConfigurationParameterGroup> forwarderConfiguration
: distributionParameterGroup.getPolicyForwarderConfigurationParameters().entrySet()) {
forwarderConfiguration.getValue().setName(forwarderConfiguration.getKey());
ParameterService.register(forwarderConfiguration.getValue());
}
for (final Entry<String, ReceptionHandlerConfigurationParameterGroup> receptionHandlerConfiguration
: distributionParameterGroup.getReceptionHandlerConfigurationParameters().entrySet()) {
receptionHandlerConfiguration.getValue().setName(receptionHandlerConfiguration.getKey());
ParameterService.register(receptionHandlerConfiguration.getValue());
}
for (final Entry<String, PolicyDecoderConfigurationParameterGroup> decoderConfiguration
: distributionParameterGroup.getPolicyDecoderConfigurationParameters().entrySet()) {
decoderConfiguration.getValue().setName(decoderConfiguration.getKey());
ParameterService.register(decoderConfiguration.getValue());
}
//@formatter:on
}
/**
* Method to deregister the parameters from Common Parameter Service.
*
* @param distributionParameterGroup the distribution parameter group
*/
public void deregisterToParameterService(final DistributionParameterGroup distributionParameterGroup) {
ParameterService.deregister(distributionParameterGroup.getName());
for (final ReceptionHandlerParameters params : distributionParameterGroup.getReceptionHandlerParameters()
.values()) {
ParameterService.deregister((params.getName()));
ParameterService.deregister((params.getPluginHandlerParameters().getName()));
}
//@formatter:off
for (final Entry<String, PolicyForwarderConfigurationParameterGroup> forwarderConfiguration
: distributionParameterGroup.getPolicyForwarderConfigurationParameters().entrySet()) {
forwarderConfiguration.getValue().setName(forwarderConfiguration.getKey());
ParameterService.deregister(forwarderConfiguration.getKey());
}
for (final Entry<String, ReceptionHandlerConfigurationParameterGroup> receptionHandlerConfiguration
: distributionParameterGroup.getReceptionHandlerConfigurationParameters().entrySet()) {
receptionHandlerConfiguration.getValue().setName(receptionHandlerConfiguration.getKey());
ParameterService.deregister(receptionHandlerConfiguration.getKey());
}
for (final Entry<String, PolicyDecoderConfigurationParameterGroup> decoderConfiguration
: distributionParameterGroup.getPolicyDecoderConfigurationParameters().entrySet()) {
decoderConfiguration.getValue().setName(decoderConfiguration.getKey());
ParameterService.deregister(decoderConfiguration.getKey());
}
//@formatter:on
}
}
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