2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2019 Nordix Foundation.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.apex.services.onappf.handler;
23 import com.google.gson.JsonObject;
24 import java.io.IOException;
25 import java.nio.charset.StandardCharsets;
26 import java.nio.file.Files;
27 import java.nio.file.Path;
28 import java.util.ArrayList;
29 import java.util.LinkedHashMap;
30 import java.util.List;
32 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
33 import org.onap.policy.apex.service.engine.main.ApexMain;
34 import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
35 import org.onap.policy.common.utils.coder.CoderException;
36 import org.onap.policy.common.utils.coder.StandardCoder;
37 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
38 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyIdentifier;
39 import org.slf4j.Logger;
40 import org.slf4j.LoggerFactory;
43 * This class instantiates the Apex Engine based on instruction from PAP.
45 * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
47 public class ApexEngineHandler {
48 private static final Logger LOGGER = LoggerFactory.getLogger(ApexEngineHandler.class);
50 private ApexMain apexMain;
53 * Constructs the object. Extracts the config and model files from each policy and instantiates the apex engine.
55 * @param policies the list of policies
56 * @throws ApexStarterException if the apex engine instantiation failed using the policies passed
58 public ApexEngineHandler(List<ToscaPolicy> policies) throws ApexStarterException {
59 Map<ToscaPolicyIdentifier, String[]> policyArgsMap = new LinkedHashMap<>();
60 for (ToscaPolicy policy : policies) {
61 Object properties = policy.getProperties().get("content");
62 final StandardCoder standardCoder = new StandardCoder();
66 JsonObject body = standardCoder.decode(standardCoder.encode(properties), JsonObject.class);
67 final JsonObject engineServiceParameters = body.get("engineServiceParameters").getAsJsonObject();
68 policyModel = standardCoder.encode(engineServiceParameters.get("policy_type_impl"));
69 engineServiceParameters.remove("policy_type_impl");
70 apexConfig = standardCoder.encode(body);
71 } catch (final CoderException e) {
72 throw new ApexStarterException(e);
75 final String modelFilePath = createFile(policyModel, "modelFile");
77 final String apexConfigFilePath = createFile(apexConfig, "apexConfigFile");
78 final String[] apexArgs = { "-c", apexConfigFilePath, "-m", modelFilePath };
79 policyArgsMap.put(policy.getIdentifier(), apexArgs);
82 LOGGER.debug("Starting apex engine.");
84 apexMain = new ApexMain(policyArgsMap);
85 } catch (ApexException e) {
86 throw new ApexStarterException(e);
91 * Method to create the policy model file.
93 * @param fileContent the content of the file
94 * @param fileName the name of the file
95 * @throws ApexStarterException if the file creation failed
97 private String createFile(final String fileContent, final String fileName) throws ApexStarterException {
99 final Path path = Files.createTempFile(fileName, ".json");
100 Files.write(path, fileContent.getBytes(StandardCharsets.UTF_8));
101 return path.toAbsolutePath().toString();
102 } catch (final IOException e) {
103 final String errorMessage = "error creating from the properties received in PdpUpdate.";
104 LOGGER.error(errorMessage, e);
105 throw new ApexStarterException(errorMessage, e);
110 * Method to check whether the apex engine is running or not.
112 public boolean isApexEngineRunning() {
113 return null != apexMain && apexMain.isAlive();
117 * Method that return the list of running policies in the apex engine.
119 public List<ToscaPolicyIdentifier> getRunningPolicies() {
120 return new ArrayList<>(apexMain.getApexParametersMap().keySet());
124 * Method to shut down the apex engine.
126 public void shutdown() throws ApexStarterException {
128 LOGGER.debug("Shutting down apex engine.");
131 } catch (final ApexException e) {
132 throw new ApexStarterException(e);