lot of changes for first actual use

dist/callchain.js

@@ -2,14 +2,22 @@
 Object.defineProperty(exports, "__esModule", { value: true });
 const log = require("./log");
 const events = require("events");
+class LastChainItem {
+    begin() {
+    }
+    send(message) {
+        log.info(`Last chain item, final result ${message}`);
+    }
+}
+let lastChainItem = new LastChainItem();
 class AChainItem extends events.EventEmitter {
     constructor(label) {
         super();
         this._label = label;
-        this._next = null;
+        this._next = lastChainItem;
     }
     toString() {
-        return `<${this._label}`;
+        return `<${this._label}>`;
     }
     registerNext(next) {
         this._next = next;
@@ -19,32 +27,33 @@ class AChainItem extends events.EventEmitter {
     }
 }
 exports.AChainItem = AChainItem;
-class ChainItem extends AChainItem {
+class ABaseChainItem extends AChainItem {
     constructor(label) {
         super(label);
     }
-    toString() {
-        let funcName = (this._chainItemFunc.name === "") ? "lambda" : this._chainItemFunc.name;
-        return `<${funcName}, ${this._label}>`;
-    }
-    registerFunc(func) {
-        this._chainItemFunc = func;
-    }
     begin() {
         if (this._next != null) {
             this._next.begin();
         }
         this.addListener('yourturn', (message) => {
             log.info(`Calling ${this.toString()}`);
-            let result = this._chainItemFunc(message);
-            if (this._next == null) {
-                log.info(`Last chain item, final result ${result}`);
-            }
-            else {
-                this._next.send(result);
-            }
+            let result = this.func(message);
+            this._next.send(result);
         });
     }
 }
+exports.ABaseChainItem = ABaseChainItem;
+class ChainItem extends ABaseChainItem {
+    toString() {
+        let funcName = (this._chainItemFunc.name === "") ? "lambda" : this._chainItemFunc.name;
+        return `<${funcName}, ${this._label}>`;
+    }
+    registerFunc(func) {
+        this._chainItemFunc = func;
+    }
+    func(message) {
+        return this._chainItemFunc(message);
+    }
+}
 exports.ChainItem = ChainItem;
 //# sourceMappingURL=callchain.js.map