KOGITO-5533: implement evaluation of rules via CloudEvents

addons/common/events/pom.xml

@@ -13,6 +13,7 @@
 
   <modules>
     <module>decisions</module>
+    <module>rules</module>
   </modules>
 
   <profiles>

addons/common/events/rules/pom.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.kie.kogito</groupId>
+    <artifactId>kogito-addons-events-parent</artifactId>
+    <version>2.0.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>kogito-addons-events-rules</artifactId>
+  <name>Kogito :: Add-Ons :: Events :: Event-Driven Rules</name>
+  <description>Trigger evaluation of rule models via events</description>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.kie.kogito</groupId>
+      <artifactId>kogito-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.kie.kogito</groupId>
+      <artifactId>kogito-events-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.kie.kogito</groupId>
+      <artifactId>kogito-addons-cloudevents-utils</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-simple</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+</project>

addons/common/events/rules/src/main/java/org/kie/kogito/eventdriven/rules/AbstractEventDrivenQueryExecutor.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2021 Red Hat, Inc. and/or its affiliates.
+ *
+ * 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.
+ */
+package org.kie.kogito.eventdriven.rules;
+
+import java.util.Optional;
+
+import org.kie.kogito.cloudevents.CloudEventUtils;
+import org.kie.kogito.rules.RuleUnit;
+import org.kie.kogito.rules.RuleUnitData;
+import org.kie.kogito.rules.RuleUnitInstance;
+import org.kie.kogito.rules.RuleUnitQuery;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import io.cloudevents.CloudEvent;
+
+public abstract class AbstractEventDrivenQueryExecutor<D extends RuleUnitData, R> implements EventDrivenQueryExecutor {
+
+    private RuleUnit<D> ruleUnit;
+    private String queryName;
+    private Class<? extends RuleUnitQuery<R>> queryClass;
+    private Class<D> dataClass;
+    private ObjectMapper mapper;
+
+    protected AbstractEventDrivenQueryExecutor() {
+    }
+
+    protected AbstractEventDrivenQueryExecutor(RuleUnit<D> ruleUnit, String queryName, Class<? extends RuleUnitQuery<R>> queryClass, Class<D> dataClass, ObjectMapper mapper) {
+        this.ruleUnit = ruleUnit;
+        this.queryName = queryName;
+        this.queryClass = queryClass;
+        this.dataClass = dataClass;
+        this.mapper = mapper;
+    }
+
+    protected void setup(RuleUnit<D> ruleUnit, String queryName, Class<? extends RuleUnitQuery<R>> queryClass, Class<D> dataClass, ObjectMapper mapper) {
+        this.ruleUnit = ruleUnit;
+        this.queryName = queryName;
+        this.queryClass = queryClass;
+        this.dataClass = dataClass;
+        this.mapper = mapper;
+    }
+
+    @Override
+    public String getRuleUnitId() {
+        return ruleUnit.id();
+    }
+
+    @Override
+    public String getQueryName() {
+        return queryName;
+    }
+
+    @Override
+    public Object executeQuery(CloudEvent input) {
+        return decodeData(input)
+                .map(this::internalExecuteQuery)
+                .orElseThrow(IllegalArgumentException::new);
+    }
+
+    private Optional<D> decodeData(CloudEvent input) {
+        return mapper == null
+                ? CloudEventUtils.decodeData(input, dataClass)
+                : CloudEventUtils.decodeData(input, dataClass, mapper);
+    }
+
+    private R internalExecuteQuery(D input) {
+        RuleUnitInstance<D> instance = ruleUnit.createInstance(input);
+        R response = instance.executeQuery(queryClass);
+        instance.dispose();
+        return response;
+    }
+}

addons/common/events/rules/src/main/java/org/kie/kogito/eventdriven/rules/EventDrivenQueryExecutor.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2021 Red Hat, Inc. and/or its affiliates.
+ *
+ * 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.
+ */
+package org.kie.kogito.eventdriven.rules;
+
+import io.cloudevents.CloudEvent;
+
+public interface EventDrivenQueryExecutor {
+
+    String getRuleUnitId();
+
+    String getQueryName();
+
+    Object executeQuery(CloudEvent input);
+
+}