Wire Tap EIP implementation and tests

eip-wire-tap/src/main/java/com/iluwatar/eip/wiretap/App.java

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+package com.iluwatar.eip.wiretap;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * In most integration cases there is a need to monitor the messages flowing through the system. It is usually achieved
+ * by intercepting the message and redirecting it to a different location like console, filesystem or the database.
+ * It is important that such functionality should not modify the original message and influence the processing path.
+ *
+ * <p>
+ * Wire Tap allows you to route messages to a separate location while they are being forwarded to the ultimate
+ * destination. It basically consumes messages of the input channel and publishes the unmodified message to both
+ * output channels.
+ * </p>
+ */
+@SpringBootApplication
+public class App {
+
+  /**
+   * Program entry point. It starts Spring Boot application and using Apache Camel it auto-configures routes.
+   *
+   * @param args command line args
+   */
+  public static void main(String[] args) {
+    SpringApplication.run(App.class, args);
+  }
+}

eip-wire-tap/src/main/java/com/iluwatar/eip/wiretap/routes/WireTapRoute.java

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+package com.iluwatar.eip.wiretap.routes;
+
+import org.apache.camel.builder.RouteBuilder;
+import org.springframework.stereotype.Component;
+
+/**
+ * Sample wire tap route definition.
+ *
+ * <p>
+ * It consumes messages out of the <i>direct:entry</i> entry point and forwards them to <i>direct:endpoint</i>.
+ * Wire Tap intercepts the message and sends it to <i>direct:wireTap</i>, which in turn forwards it to
+ * <i>direct:wireTapEndpoint</i>.
+ * </p>
+ *
+ * In this example input/output endpoints names are stored in <i>application.properties</i> file.
+ */
+@Component
+public class WireTapRoute extends RouteBuilder {
+
+  /**
+   * Configures the route
+   * @throws Exception in case of exception during configuration
+   */
+  @Override
+  public void configure() throws Exception {
+    // Main route
+    from("{{entry}}").wireTap("direct:wireTap").to("{{endpoint}}");
+
+    // Wire tap route
+    from("direct:wireTap").to("{{wireTapEndpoint}}");
+  }
+}

eip-wire-tap/src/main/resources/application.properties

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+entry=direct:entry
+endpoint=direct:endpoint
+wireTapEndpoint=direct:wireTapEndpoint