update order tutorial to make suspect order rule configurable via JMX at runtime

easyrules-samples/src/main/java/net/benas/easyrules/samples/order/Order.java

@@ -31,8 +31,6 @@ package net.benas.easyrules.samples.order;
  */
 class Order {
 
-    public static float ORDER_AMOUNT_THRESHOLD = 1000;
-
     private long orderId;
 
     private float amount;

easyrules-samples/src/main/java/net/benas/easyrules/samples/order/OrderSampleLauncher.java

@@ -34,7 +34,7 @@ import net.benas.easyrules.core.DefaultRulesEngine;
  */
 public class OrderSampleLauncher {
 
-    public static void main(String[] args) {
+    public static void main(String[] args) throws InterruptedException {
 
         Order order = new Order(6654, 1200);
         Customer customer = new Customer(2356, true);
@@ -44,7 +44,7 @@ public class OrderSampleLauncher {
          */
         SuspectOrderRule suspectOrderRule = new SuspectOrderRule(
                 "Suspect Order",
-                "Send alert if a new customer checks out an order with amount greater than 1000$",
+                "Send alert if a new customer checks out an order with amount greater than a threshold",
                 1);
 
         /**
@@ -57,12 +57,21 @@ public class OrderSampleLauncher {
          * Create a default rules engine and register the business rule
          */
         RulesEngine rulesEngine = new DefaultRulesEngine();
-        rulesEngine.registerRule(suspectOrderRule);
+        rulesEngine.registerJmxManagedRule(suspectOrderRule, true, SuspectOrderJmxManagedRule.class);
 
         /**
          * Fire rules
          */
         rulesEngine.fireRules();
 
+        // Suspend execution for 30s to have time to update suspect order amount threshold via a JMX client.
+        Thread.sleep(30000);
+
+        System.out.println("**************************************************************");
+        System.out.println("Re fire rules after updating suspect order amount threshold...");
+        System.out.println("**************************************************************");
+
+        rulesEngine.fireRules();
+
     }
 }

easyrules-samples/src/main/java/net/benas/easyrules/samples/order/SuspectOrderJmxManagedRule.java

@@ -0,0 +1,29 @@
+package net.benas.easyrules.samples.order;
+
+import net.benas.easyrules.api.JmxManagedRule;
+
+import javax.management.MXBean;
+
+/**
+ * Interface to make suspect order rule manageable via JMX.<br/>
+ * Suspect order threshold should be changed at runtime.
+ *
+ * @author benas (md.benhassine@gmail.com)
+ */
+
+@MXBean
+public interface SuspectOrderJmxManagedRule extends JmxManagedRule {
+
+    /**
+     * Get the current suspect order amount threshold
+     * @return current suspect order amount threshold
+     */
+    float getSuspectOrderAmountThreshold();
+
+    /**
+     * Set the suspect order amount threshold
+     * @param suspectOrderAmountThreshold the new suspect order amount threshold
+     */
+    void setSuspectOrderAmountThreshold(float suspectOrderAmountThreshold);
+
+}

easyrules-samples/src/main/java/net/benas/easyrules/samples/order/SuspectOrderRule.java

@@ -31,7 +31,9 @@ import net.benas.easyrules.core.Rule;
  *
  * @author benas (md.benhassine@gmail.com)
  */
-class SuspectOrderRule extends Rule {
+class SuspectOrderRule extends Rule implements SuspectOrderJmxManagedRule {
+
+    private float suspectOrderAmountThreshold = 1000;
 
     private Order order;
 
@@ -43,13 +45,13 @@ class SuspectOrderRule extends Rule {
 
     @Override
     public boolean evaluateConditions() {
-        return order.getAmount() > Order.ORDER_AMOUNT_THRESHOLD && customer.isNew();
+        return order.getAmount() > suspectOrderAmountThreshold && customer.isNew();
     }
 
     @Override
     public void performActions() throws Exception {
         System.out.println("Alert : A new customer [id=" + customer.getCustomerId() + "] has checked out an order [id=" +
-                order.getOrderId() + "] with amount " + order.getAmount() + " > " + Order.ORDER_AMOUNT_THRESHOLD);
+                order.getOrderId() + "] with amount " + order.getAmount() + " > " + suspectOrderAmountThreshold);
     }
 
     public void setOrder(Order order) {
@@ -59,4 +61,13 @@ class SuspectOrderRule extends Rule {
     public void setCustomer(Customer customer) {
         this.customer = customer;
     }
+
+    public float getSuspectOrderAmountThreshold() {
+        return suspectOrderAmountThreshold;
+    }
+
+    public void setSuspectOrderAmountThreshold(float suspectOrderAmountThreshold) {
+        this.suspectOrderAmountThreshold = suspectOrderAmountThreshold;
+    }
+
 }