add weather tutorial

easy-rules-tutorials/pom.xml

@@ -149,6 +149,28 @@
                 </plugins>
             </build>
         </profile>
+        <profile>
+            <id>runWeatherTutorial</id>
+            <build>
+                <defaultGoal>exec:java</defaultGoal>
+                <plugins>
+                    <plugin>
+                        <groupId>org.codehaus.mojo</groupId>
+                        <artifactId>exec-maven-plugin</artifactId>
+                        <version>${maven-exec-plugin.version}</version>
+                        <configuration>
+                            <mainClass>org.jeasy.rules.tutorials.weather.Launcher</mainClass>
+                            <systemProperties>
+                                <systemProperty>
+                                    <key>java.util.logging.SimpleFormatter.format</key>
+                                    <value>[%1$tc] %4$s: %5$s%n</value>
+                                </systemProperty>
+                            </systemProperties>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
         <profile>
             <id>runShopTutorial</id>
             <build>

easy-rules-tutorials/src/main/java/org/jeasy/rules/tutorials/weather/Launcher.java

@@ -0,0 +1,25 @@
+package org.jeasy.rules.tutorials.weather;
+
+import org.jeasy.rules.api.Facts;
+import org.jeasy.rules.api.Rules;
+import org.jeasy.rules.api.RulesEngine;
+import org.jeasy.rules.core.DefaultRulesEngine;
+
+public class Launcher {
+
+    public static void main(String[] args) {
+        // define facts
+        Facts facts = new Facts();
+        facts.put("rain", true);
+
+        // define rules
+        WeatherRule weatherRule = new WeatherRule();
+        Rules rules = new Rules();
+        rules.register(weatherRule);
+
+        // fire rules on known facts
+        RulesEngine rulesEngine = new DefaultRulesEngine();
+        rulesEngine.fire(rules, facts);
+    }
+
+}

easy-rules-tutorials/src/main/java/org/jeasy/rules/tutorials/weather/WeatherRule.java

@@ -0,0 +1,20 @@
+package org.jeasy.rules.tutorials.weather;
+
+import org.jeasy.rules.annotation.Action;
+import org.jeasy.rules.annotation.Condition;
+import org.jeasy.rules.annotation.Fact;
+import org.jeasy.rules.annotation.Rule;
+
+@Rule(name = "weather rule", description = "if it rains then take an umbrella" )
+public class WeatherRule {
+
+    @Condition
+    public boolean itRains(@Fact("rain") boolean rain) {
+        return rain;
+    }
+    
+    @Action
+    public void takeAnUmbrella() {
+        System.out.println("It rains, take an umbrella!");
+    }
+}