2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
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.tools.model.generator.model2event;
23 import java.util.HashSet;
24 import java.util.Properties;
27 import org.apache.avro.Schema;
28 import org.apache.avro.Schema.Field;
29 import org.apache.commons.lang3.Validate;
30 import org.onap.policy.apex.context.parameters.SchemaParameters;
31 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
32 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
33 import org.onap.policy.apex.model.eventmodel.concepts.AxEvent;
34 import org.onap.policy.apex.model.modelapi.ApexApiResult;
35 import org.onap.policy.apex.model.modelapi.ApexModel;
36 import org.onap.policy.apex.model.modelapi.ApexModelFactory;
37 import org.onap.policy.apex.model.policymodel.concepts.AxPolicies;
38 import org.onap.policy.apex.model.policymodel.concepts.AxPolicy;
39 import org.onap.policy.apex.model.policymodel.concepts.AxPolicyModel;
40 import org.onap.policy.apex.model.policymodel.concepts.AxState;
41 import org.onap.policy.apex.model.policymodel.concepts.AxStateOutput;
42 import org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelperParameters;
43 import org.onap.policy.apex.tools.model.generator.SchemaUtils;
44 import org.slf4j.ext.XLogger;
45 import org.slf4j.ext.XLoggerFactory;
46 import org.stringtemplate.v4.ST;
47 import org.stringtemplate.v4.STGroup;
48 import org.stringtemplate.v4.STGroupFile;
51 * Takes a model and generates the JSON event schemas.
53 * @author Sven van der Meer (sven.van.der.meer@ericsson.com)
55 public class Model2JsonEventSchema {
56 // Logger for this class
57 private static final XLogger LOGGER = XLoggerFactory.getXLogger(Model2JsonEventSchema.class);
59 // Recurring string constants
60 private static final String TARGET = "target";
61 private static final String SOURCE = "source";
62 private static final String VERSION = "version";
63 private static final String NAME_SPACE = "nameSpace";
65 /** Application name, used as prompt. */
66 private final String appName;
68 /** The file name of the policy model. */
69 private final String modelFile;
71 /** The type of events to generate: stimuli, response, internal. */
72 private final String type;
75 * Creates a new model to event schema generator.
77 * @param modelFile the model file to be used
78 * @param type the type of events to generate, one of: stimuli, response, internal
79 * @param appName application name for printouts
81 public Model2JsonEventSchema(final String modelFile, final String type, final String appName) {
82 Validate.notNull(modelFile, "Model2JsonEvent: given model file name was blank");
83 Validate.notNull(type, "Model2JsonEvent: given type was blank");
84 Validate.notNull(appName, "Model2JsonEvent: given application name was blank");
86 this.modelFile = modelFile;
88 this.appName = appName;
92 * Adds a type to a field for a given schema.
94 * @param schema the schema to add a type for
96 * @return a template with the type
98 protected ST addFieldType(final Schema schema, final STGroup stg) {
100 switch (schema.getType()) {
109 ret = stg.getInstanceOf("fieldTypeAtomic");
110 ret.add("type", schema.getType());
114 ret = stg.getInstanceOf("fieldTypeArray");
115 ret.add("array", this.addFieldType(schema.getElementType(), stg));
118 ret = stg.getInstanceOf("fieldTypeEnum");
119 ret.add("symbols", schema.getEnumSymbols());
123 ret = stg.getInstanceOf("fieldTypeMap");
124 ret.add("map", this.addFieldType(schema.getValueType(), stg));
128 ret = processRecord(schema, stg);
142 * Process a record entry.
143 * @param schema the schema to add a type for
145 * @return a template with the type
147 private ST processRecord(final Schema schema, final STGroup stg) {
149 ret = stg.getInstanceOf("fieldTypeRecord");
150 for (final Field field : schema.getFields()) {
151 final ST st = stg.getInstanceOf("field");
152 st.add("name", field.name());
153 st.add("type", this.addFieldType(field.schema(), stg));
154 ret.add("fields", st);
160 * Runs the application.
163 * @return status of the application execution, 0 for success, positive integer for exit condition (such as help or
164 * version), negative integer for errors
165 * @throws ApexException if any problem occurred in the model
167 public int runApp() throws ApexException {
168 final STGroupFile stg = new STGroupFile("org/onap/policy/apex/tools/model/generator/event-json.stg");
169 final ST stEvents = stg.getInstanceOf("events");
171 final ApexModelFactory factory = new ApexModelFactory();
172 final ApexModel model = factory.createApexModel(new Properties(), true);
174 final ApexApiResult result = model.loadFromFile(modelFile);
175 if (result.isNok()) {
176 String message = appName + ": " + result.getMessage();
177 LOGGER.error(message);
181 final AxPolicyModel policyModel = model.getPolicyModel();
182 policyModel.register();
183 new SchemaParameters().getSchemaHelperParameterMap().put("Avro", new AvroSchemaHelperParameters());
185 final Set<AxEvent> events = new HashSet<>();
186 final Set<AxArtifactKey> eventKeys = new HashSet<>();
187 final AxPolicies policies = policyModel.getPolicies();
190 processStimuli(eventKeys, policies);
193 processResponse(eventKeys, policies);
196 processInternal(eventKeys, policies);
199 LOGGER.error("{}: unknown type <{}>, cannot proceed", appName, type);
203 for (final AxEvent event : policyModel.getEvents().getEventMap().values()) {
204 for (final AxArtifactKey key : eventKeys) {
205 if (event.getKey().equals(key)) {
211 for (final AxEvent event : events) {
212 final ST stEvent = stg.getInstanceOf("event");
213 stEvent.add("name", event.getKey().getName());
214 stEvent.add(NAME_SPACE, event.getNameSpace());
215 stEvent.add(VERSION, event.getKey().getVersion());
216 stEvent.add(SOURCE, event.getSource());
217 stEvent.add(TARGET, event.getTarget());
219 final Schema avro = SchemaUtils.getEventSchema(event);
220 for (final Field field : avro.getFields()) {
221 // filter magic names
222 switch (field.name()) {
230 stEvent.add("fields", this.setField(field, stg));
233 stEvents.add("event", stEvent);
235 String renderMessage = stEvents.render();
236 LOGGER.error(renderMessage);
241 * Process the "stimuli" keyword.
242 * @param eventKeys the event keys
243 * @param policies the policies to process
245 private void processStimuli(final Set<AxArtifactKey> eventKeys, final AxPolicies policies) {
246 for (final AxPolicy policy : policies.getPolicyMap().values()) {
247 final String firsState = policy.getFirstState();
248 for (final AxState state : policy.getStateMap().values()) {
249 if (state.getKey().getLocalName().equals(firsState)) {
250 eventKeys.add(state.getTrigger());
257 * Process the "response" keyword.
258 * @param eventKeys the event keys
259 * @param policies the policies to process
261 private void processResponse(final Set<AxArtifactKey> eventKeys, final AxPolicies policies) {
262 for (final AxPolicy policy : policies.getPolicyMap().values()) {
263 processState(eventKeys, policy);
268 * Process the state in the response.
269 * @param eventKeys the event keys
270 * @param policies the policies to process
272 private void processState(final Set<AxArtifactKey> eventKeys, final AxPolicy policy) {
273 for (final AxState state : policy.getStateMap().values()) {
274 if ("NULL".equals(state.getNextStateSet().iterator().next())) {
275 for (final AxStateOutput output : state.getStateOutputs().values()) {
276 eventKeys.add(output.getOutgingEvent());
283 * Process the "internal" keyword.
284 * @param eventKeys the event keys
285 * @param policies the policies to process
287 private void processInternal(final Set<AxArtifactKey> eventKeys, final AxPolicies policies) {
288 for (final AxPolicy policy : policies.getPolicyMap().values()) {
289 final String firsState = policy.getFirstState();
290 for (final AxState state : policy.getStateMap().values()) {
291 processInternalState(eventKeys, firsState, state);
297 * Process the internal state.
298 * @param eventKeys the event keys
299 * @param policies the policies to process
301 private void processInternalState(final Set<AxArtifactKey> eventKeys, final String firsState, final AxState state) {
302 if (state.getKey().getLocalName().equals(firsState)) {
305 if ("NULL".equals(state.getNextStateSet().iterator().next())) {
308 for (final AxStateOutput output : state.getStateOutputs().values()) {
309 eventKeys.add(output.getOutgingEvent());
314 * Adds a field to the output.
316 * @param field the field from the event
318 * @return a template for the field
320 protected ST setField(final Field field, final STGroup stg) {
321 final ST st = stg.getInstanceOf("field");
322 switch (field.name()) {
330 st.add("name", field.name());
331 st.add("type", this.addFieldType(field.schema(), stg));