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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019-2020 Nordix Foundation.
* Modifications Copyright (C) 2020 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.services.onappf.handler;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
import org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel;
import org.onap.policy.apex.service.engine.main.ApexMain;
import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyIdentifier;
import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplate;
import org.onap.policy.models.tosca.authorative.concepts.ToscaTopologyTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class instantiates the Apex Engine based on instruction from PAP.
*
* @author Ajith Sreekumar (ajith.sreekumar@est.tech)
*/
public class ApexEngineHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(ApexEngineHandler.class);
private ApexMain apexMain;
/**
* Constructs the object. Extracts the config and model files from each policy and instantiates the apex engine.
*
* @param policies the list of policies
* @throws ApexStarterException if the apex engine instantiation failed using the policies passed
*/
public ApexEngineHandler(List<ToscaPolicy> policies) throws ApexStarterException {
Map<ToscaPolicyIdentifier, String[]> policyArgsMap = createPolicyArgsMap(policies);
LOGGER.debug("Starting apex engine.");
try {
apexMain = new ApexMain(policyArgsMap);
} catch (ApexException e) {
throw new ApexStarterException(e);
}
}
/**
* Updates the Apex Engine with the policy model created from new list of policies.
*
* @param policies the list of policies
* @throws ApexStarterException if the apex engine instantiation failed using the policies passed
*/
public void updateApexEngine(List<ToscaPolicy> policies) throws ApexStarterException {
if (null == apexMain || !apexMain.isAlive()) {
throw new ApexStarterException("Apex Engine not initialized.");
}
Map<ToscaPolicyIdentifier, String[]> policyArgsMap = createPolicyArgsMap(policies);
try {
apexMain.updateModel(policyArgsMap);
} catch (ApexException e) {
throw new ApexStarterException(e);
}
}
private Map<ToscaPolicyIdentifier, String[]> createPolicyArgsMap(List<ToscaPolicy> policies)
throws ApexStarterException {
Map<ToscaPolicyIdentifier, String[]> policyArgsMap = new LinkedHashMap<>();
for (ToscaPolicy policy : policies) {
String policyName = policy.getIdentifier().getName();
final StandardCoder standardCoder = new StandardCoder();
ToscaServiceTemplate toscaServiceTemplate = new ToscaServiceTemplate();
ToscaTopologyTemplate toscaTopologyTemplate = new ToscaTopologyTemplate();
toscaTopologyTemplate.setPolicies(List.of(Map.of(policyName, policy)));
toscaServiceTemplate.setToscaTopologyTemplate(toscaTopologyTemplate);
File file;
try {
file = File.createTempFile(policyName, ".json");
standardCoder.encode(file, toscaServiceTemplate);
} catch (CoderException | IOException e) {
throw new ApexStarterException(e);
}
final String[] apexArgs = {"-p", file.getAbsolutePath()};
policyArgsMap.put(policy.getIdentifier(), apexArgs);
}
return policyArgsMap;
}
/**
* Method to get the APEX engine statistics.
*/
public List<AxEngineModel> getEngineStats() {
List<AxEngineModel> engineStats = null;
if (null != apexMain && apexMain.isAlive()) {
engineStats = apexMain.getEngineStats();
}
return engineStats;
}
/**
* Method to check whether the apex engine is running or not.
*/
public boolean isApexEngineRunning() {
return null != apexMain && apexMain.isAlive();
}
/**
* Method that return the list of running policies in the apex engine.
*/
public List<ToscaPolicyIdentifier> getRunningPolicies() {
return new ArrayList<>(apexMain.getApexParametersMap().keySet());
}
/**
* Method to shut down the apex engine.
*/
public void shutdown() throws ApexStarterException {
try {
LOGGER.debug("Shutting down apex engine.");
apexMain.shutdown();
apexMain = null;
} catch (final ApexException e) {
throw new ApexStarterException(e);
}
}
}
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