lachlan · June 26, 2012 23:33 · Jun 26, 2012
diff --git a/Pipeline.java b/Pipeline.java
@@ -0,0 +1,70 @@
+// Every webMethods Integration Server service has exactly one input
+// argument: the pipeline.
+//
+// The pipeline is like a java.util.Map object that gets passed to each
+// service that gets called.  (It's actually a com.wm.data.IData object,
+// which unfortunately doesn't implement java.util.Map.)
+//
+// Because objects are passed by reference, every service called can alter
+// the keys and values in the pipeline.
+//
+// This is an example of how the webMethods Integration Server pipeline
+// would work if it was implemented in Java using java.util.Map objects.
+//
+// $ javac Pipeline.java
+// $ java Pipeline
+
+import java.util.*;
+
+public class Pipeline {
+  public static void greet(Map<String, Object> pipeline) {
+    // convert the name input argument to uppercase: this litters the
+    // pipeline with "instring" and "outstring" variables
+    pipeline.put("instring", pipeline.get("name"));
+    upcase(pipeline);
+    pipeline.put("name", pipeline.get("outstring"));
+
+    // get honorific for the gender: this litters the pipeline with the
+    // variable "honorific"
+    honorific(pipeline);
+
+    // add greeting variable to pipeline: this is an output argument for the method
+    pipeline.put("greeting", "Hello " + pipeline.get("honorific") + " " + pipeline.get("name"));
+  }
+
+  public static void upcase(Map<String, Object> pipeline) {
+    String instring = (String)pipeline.get("instring");
+    String outstring = instring.toUpperCase();
+    pipeline.put("outstring", outstring);
+  }
+
+  public static void honorific(Map<String, Object> pipeline) {
+    String gender = (String)pipeline.get("gender");
+    String honorific = "";
+
+    if (gender.equals("male")) {
+      honorific = "Mr";
+    } else if (gender.equals("female")) {
+      honorific = "Ms";
+    }
+
+    pipeline.put("honorific", honorific);
+  }
+
+  public static void main(String[] args) {
+    // create a new pipeline, and populate it with some variables
+    Map<String, Object> pipeline = new HashMap<String, Object>();
+    pipeline.put("name", "John Doe");
+    pipeline.put("gender", "male");
+    pipeline.put("email", "[email protected]");
+    pipeline.put("address", "123 Sycamore Street");
+
+    // call greet service, passing the pipeline
+    // greet then calls upcase and honorific, both of which
+    // litter the pipeline with their arguments
+    greet(pipeline);
+
+    System.out.println("greeting = " + pipeline.get("greeting"));
+    System.out.println("pipeline = " + pipeline);
+  }
+}