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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 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.apex.services.onappf.handler;
import com.google.gson.JsonObject;
import java.io.IOException;
import java.io.StringReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
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.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 apex config and model files and instantiates the apex engine.
*
* @param properties the properties which contains the policies and configurations received from pap
* @throws ApexStarterException if the apex engine instantiation failed using the properties passed
*/
public ApexEngineHandler(final Object properties) throws ApexStarterException {
final StandardCoder standardCoder = new StandardCoder();
String policyModel;
String apexConfig;
try {
JsonObject body = standardCoder.decode(standardCoder.encode(properties), JsonObject.class);
final JsonObject engineServiceParameters = body.get("engineServiceParameters").getAsJsonObject();
policyModel = standardCoder.encode(engineServiceParameters.get("policy_type_impl"));
engineServiceParameters.remove("policy_type_impl");
apexConfig = standardCoder.encode(body);
} catch (final CoderException e) {
throw new ApexStarterException(e);
}
final String modelFilePath = createFile(policyModel, "modelFile");
final String apexConfigFilePath = createFile(apexConfig, "apexConfigFile");
final String[] apexArgs = { "-c", apexConfigFilePath, "-m", modelFilePath };
LOGGER.debug("Starting apex engine.");
apexMain = new ApexMain(apexArgs);
}
/**
* Method to create the policy model file.
*
* @param fileContent the content of the file
* @param fileName the name of the file
* @throws ApexStarterException if the file creation failed
*/
private String createFile(final String fileContent, final String fileName) throws ApexStarterException {
try {
final Path path = Files.createTempFile(fileName, ".json");
Files.write(path, fileContent.getBytes(StandardCharsets.UTF_8));
return path.toAbsolutePath().toString();
} catch (final IOException e) {
final String errorMessage = "error creating from the properties received in PdpUpdate.";
LOGGER.error(errorMessage, e);
throw new ApexStarterException(errorMessage, e);
}
}
/**
* Method to check whether the apex engine is running or not.
*/
public boolean isApexEngineRunning() {
return null != apexMain;
}
/**
* 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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