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;
26 import org.apache.avro.Schema;
27 import org.apache.avro.Schema.Field;
28 import org.apache.avro.Schema.Type;
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.service.engine.event.ApexEventException;
44 import org.onap.policy.apex.tools.model.generator.SchemaUtils;
45 import org.slf4j.ext.XLogger;
46 import org.slf4j.ext.XLoggerFactory;
47 import org.stringtemplate.v4.ST;
48 import org.stringtemplate.v4.STGroup;
49 import org.stringtemplate.v4.STGroupFile;
52 * Takes a model and generates the JSON event schemas.
54 * @author Sven van der Meer (sven.van.der.meer@ericsson.com)
56 public class Model2JsonEventSchema {
57 // Logger for this class
58 private static final XLogger LOGGER = XLoggerFactory.getXLogger(Model2JsonEventSchema.class);
60 // Recurring string constants
61 private static final String TARGET = "target";
62 private static final String SOURCE = "source";
63 private static final String VERSION = "version";
64 private static final String NAME_SPACE = "nameSpace";
66 /** Application name, used as prompt. */
67 private final String appName;
69 /** The file name of the policy model. */
70 private final String modelFile;
72 /** The type of events to generate: stimuli, response, internal. */
73 private final String type;
76 * Creates a new model to event schema generator.
78 * @param modelFile the model file to be used
79 * @param type the type of events to generate, one of: stimuli, response, internal
80 * @param appName application name for printouts
82 public Model2JsonEventSchema(final String modelFile, final String type, final String appName) {
83 Validate.notNull(modelFile, "Model2JsonEvent: given model file name was blank");
84 Validate.notNull(type, "Model2JsonEvent: given type was blank");
85 Validate.notNull(appName, "Model2JsonEvent: given application name was blank");
87 this.modelFile = modelFile;
89 this.appName = appName;
93 * Adds a type to a field for a given schema.
95 * @param schema the schema to add a type for
97 * @return a template with the type
99 protected ST addFieldType(final Schema schema, final STGroup stg) {
102 if (isSimpleType(schema.getType())) {
103 ret = stg.getInstanceOf("fieldTypeAtomic");
104 ret.add("type", schema.getType());
108 switch (schema.getType()) {
110 ret = stg.getInstanceOf("fieldTypeArray");
111 ret.add("array", this.addFieldType(schema.getElementType(), stg));
114 ret = stg.getInstanceOf("fieldTypeEnum");
115 ret.add("symbols", schema.getEnumSymbols());
119 ret = stg.getInstanceOf("fieldTypeMap");
120 ret.add("map", this.addFieldType(schema.getValueType(), stg));
124 ret = processRecord(schema, stg);
138 * Check if a schema is a simple type.
140 * @param schemaType the type of the schema
141 * @return true if the schema is a simple type
143 private boolean isSimpleType(Type schemaType) {
144 switch (schemaType) {
161 * Process a record entry.
162 * @param schema the schema to add a type for
164 * @return a template with the type
166 private ST processRecord(final Schema schema, final STGroup stg) {
168 ret = stg.getInstanceOf("fieldTypeRecord");
169 for (final Field field : schema.getFields()) {
170 final ST st = stg.getInstanceOf("field");
171 st.add("name", field.name());
172 st.add("type", this.addFieldType(field.schema(), stg));
173 ret.add("fields", st);
179 * Runs the application.
182 * @return status of the application execution, 0 for success, positive integer for exit condition (such as help or
183 * version), negative integer for errors
184 * @throws ApexException if any problem occurred in the model
186 public int runApp() throws ApexException {
187 final STGroupFile stg = new STGroupFile("org/onap/policy/apex/tools/model/generator/event-json.stg");
188 final ST stEvents = stg.getInstanceOf("events");
190 final ApexModelFactory factory = new ApexModelFactory();
191 final ApexModel model = factory.createApexModel(new Properties(), true);
193 final ApexApiResult result = model.loadFromFile(modelFile);
194 if (result.isNok()) {
195 String message = appName + ": " + result.getMessage();
196 LOGGER.error(message);
200 final AxPolicyModel policyModel = model.getPolicyModel();
201 policyModel.register();
202 new SchemaParameters().getSchemaHelperParameterMap().put("Avro", new AvroSchemaHelperParameters());
204 final Set<AxEvent> events = new HashSet<>();
205 final Set<AxArtifactKey> eventKeys = new HashSet<>();
206 final AxPolicies policies = policyModel.getPolicies();
209 processStimuli(eventKeys, policies);
212 processResponse(eventKeys, policies);
215 processInternal(eventKeys, policies);
218 LOGGER.error("{}: unknown type <{}>, cannot proceed", appName, type);
222 for (final AxEvent event : policyModel.getEvents().getEventMap().values()) {
223 for (final AxArtifactKey key : eventKeys) {
224 if (event.getKey().equals(key)) {
230 String renderMessage = renderEvents(stg, stEvents, events);
231 LOGGER.error(renderMessage);
238 * @param stg the string template
239 * @param stEvents the event template
240 * @param events the events to render
241 * @return the rendered events
242 * @throws ApexEventException on rendering exceptions
244 private String renderEvents(final STGroupFile stg, final ST stEvents, final Set<AxEvent> events)
245 throws ApexEventException {
246 for (final AxEvent event : events) {
247 final ST stEvent = stg.getInstanceOf("event");
248 stEvent.add("name", event.getKey().getName());
249 stEvent.add(NAME_SPACE, event.getNameSpace());
250 stEvent.add(VERSION, event.getKey().getVersion());
251 stEvent.add(SOURCE, event.getSource());
252 stEvent.add(TARGET, event.getTarget());
254 final Schema avro = SchemaUtils.getEventSchema(event);
255 for (final Field field : avro.getFields()) {
256 // filter magic names
257 switch (field.name()) {
265 stEvent.add("fields", this.setField(field, stg));
268 stEvents.add("event", stEvent);
270 return stEvents.render();
274 * Process the "stimuli" keyword.
275 * @param eventKeys the event keys
276 * @param policies the policies to process
278 private void processStimuli(final Set<AxArtifactKey> eventKeys, final AxPolicies policies) {
279 for (final AxPolicy policy : policies.getPolicyMap().values()) {
280 final String firsState = policy.getFirstState();
281 for (final AxState state : policy.getStateMap().values()) {
282 if (state.getKey().getLocalName().equals(firsState)) {
283 eventKeys.add(state.getTrigger());
290 * Process the "response" keyword.
291 * @param eventKeys the event keys
292 * @param policies the policies to process
294 private void processResponse(final Set<AxArtifactKey> eventKeys, final AxPolicies policies) {
295 for (final AxPolicy policy : policies.getPolicyMap().values()) {
296 processState(eventKeys, policy);
301 * Process the state in the response.
302 * @param eventKeys the event keys
303 * @param policies the policies to process
305 private void processState(final Set<AxArtifactKey> eventKeys, final AxPolicy policy) {
306 for (final AxState state : policy.getStateMap().values()) {
307 if ("NULL".equals(state.getNextStateSet().iterator().next())) {
308 for (final AxStateOutput output : state.getStateOutputs().values()) {
309 eventKeys.add(output.getOutgingEvent());
316 * Process the "internal" keyword.
317 * @param eventKeys the event keys
318 * @param policies the policies to process
320 private void processInternal(final Set<AxArtifactKey> eventKeys, final AxPolicies policies) {
321 for (final AxPolicy policy : policies.getPolicyMap().values()) {
322 final String firsState = policy.getFirstState();
323 for (final AxState state : policy.getStateMap().values()) {
324 processInternalState(eventKeys, firsState, state);
330 * Process the internal state.
331 * @param eventKeys the event keys
332 * @param policies the policies to process
334 private void processInternalState(final Set<AxArtifactKey> eventKeys, final String firsState, final AxState state) {
335 if (state.getKey().getLocalName().equals(firsState)) {
338 if ("NULL".equals(state.getNextStateSet().iterator().next())) {
341 for (final AxStateOutput output : state.getStateOutputs().values()) {
342 eventKeys.add(output.getOutgingEvent());
347 * Adds a field to the output.
349 * @param field the field from the event
351 * @return a template for the field
353 protected ST setField(final Field field, final STGroup stg) {
354 final ST st = stg.getInstanceOf("field");
355 switch (field.name()) {
363 st.add("name", field.name());
364 st.add("type", this.addFieldType(field.schema(), stg));