callchains implemented

dist/callchain.js

@@ -0,0 +1,50 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const log = require("./log");
+const events = require("events");
+class AChainItem extends events.EventEmitter {
+    constructor(label) {
+        super();
+        this._label = label;
+        this._next = null;
+    }
+    toString() {
+        return `<${this._label}`;
+    }
+    registerNext(next) {
+        this._next = next;
+    }
+    send(message) {
+        this.emit('yourturn', message);
+    }
+}
+exports.AChainItem = AChainItem;
+class ChainItem extends AChainItem {
+    constructor(label) {
+        super(label);
+    }
+    toString() {
+        let funcName = (this._chainItemFunc.name === "") ? "lambda" : this._chainItemFunc.name;
+        return `<${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);
+            }
+        });
+    }
+}
+exports.ChainItem = ChainItem;
+//# sourceMappingURL=callchain.js.map