babble - npm Package Compare versions

Comparing version 0.8.0 to 0.9.0

dist/babble.min.js

@@ -1,2 +0,2 @@
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examples/pubnub.js

@@ -5,3 +5,3 @@ var babble = require('../index');
 // initialize pubnub messaging
-var pubnub = babble.messagers.pubnub({
+var pubnub = babble.messagebus.pubnub({
   publish_key: 'demo',    // REPLACE THIS WITH YOUR PUBNUB PUBLISH KEY
@@ -8,0 +8,0 @@ subscribe_key: 'demo'   // REPLACE THIS WITH YOUR PUBNUB SUBSCRIBE KEY

HISTORY.md

@@ -5,2 +5,10 @@ # babble history
 
+## 2014-08-11, version 0.9.0
+
+- Implemented `'default'` choice in `Decision`.
+- Some code simplifications.
+- Renamed `messagers` to `messagebus`.
+- Documented message bus interface and protocol.
+
+
 ## 2014-08-07, version 0.8.0
@@ -7,0 +15,0 @@

lib/babble.js

@@ -56,3 +56,2 @@ 'use strict';
  * Create a decision block and chain it to the current block.
- * Returns the first block in the chain.
  *
@@ -82,2 +81,6 @@ * Syntax:
  *
+ * There is one special id for choices: 'default'. This id is called when either
+ * the decision function returns an id which does not match any of the available
+ * choices.
+ *
  * @param {Function | Object} arg1  Can be {function} decision or {Object} choices
@@ -175,4 +178,4 @@ * @param {Object} [arg2]           choices
 
-// export messaging interfaces
-exports.messagers = require('./messagers');
+// export messagebus interfaces
+exports.messagebus = require('./messagebus');
 
@@ -179,0 +182,0 @@ /**

lib/Babbler.js

@@ -6,3 +6,3 @@ 'use strict';
 
-var messagers = require('./messagers');
+var messagebus = require('./messagebus');
 var Conversation = require('./Conversation');
@@ -38,37 +38,37 @@ var Block = require('./block/Block');
 /**
- * Connect to a messaging system
- * @param {{connect: function, disconnect: function, send: function}} [messager]
+ * Connect to a message bus
+ * @param {{connect: function, disconnect: function, send: function}} [bus]
  *          A messaging interface. Must have the following functions:
  *          - connect(params: {id: string,
- *            message: function, connect: function}) : string
+ *            message: function, callback: function}) : string
  *            must return a token to disconnects again.
- *            parameter connect is optional.
+ *            parameter callback is optional.
  *          - disconnect(token: string)
- *            disconnect from a messager.
+ *            disconnect from a message bus.
  *          - send(id: string, message: *)
  *            send a message
- *          A number of interfaces is provided under babble.messagers.
- *          Default interface is babble.messagers['default']
+ *          A number of interfaces is provided under babble.messagebus.
+ *          Default interface is babble.messagebus['default']
  * @return {Promise.<Babbler>}  Returns a Promise which resolves when the
  *                              babbler is connected.
  */
-Babbler.prototype.connect = function (messager) {
+Babbler.prototype.connect = function (bus) {
   // disconnect (in case we are already connected)
   this.disconnect();
 
-  if (!messager) {
-    messager = messagers['default']();
+  if (!bus) {
+    bus = messagebus['default']();
   }
 
-  // validate the messagers fucntions
-  if (typeof messager.connect !== 'function') {
-    throw new Error('messager must contain a function ' +
+  // validate the message bus functions
+  if (typeof bus.connect !== 'function') {
+    throw new Error('message bus must contain a function ' +
         'connect(params: {id: string, callback: function}) : string');
   }
-  if (typeof messager.disconnect !== 'function') {
-    throw new Error('messager must contain a function ' +
+  if (typeof bus.disconnect !== 'function') {
+    throw new Error('message bus must contain a function ' +
         'disconnect(token: string)');
   }
-  if (typeof messager.send !== 'function') {
-    throw new Error('messager must contain a function ' +
+  if (typeof bus.send !== 'function') {
+    throw new Error('message bus must contain a function ' +
         'send(params: {id: string, message: *})');
@@ -85,6 +85,6 @@ }
 
-  var token = messager.connect({
+  var token = bus.connect({
     id: this.id,
     message: this._onMessage.bind(this),
-    connect: _resolve
+    callback: _resolve
   });
@@ -94,5 +94,5 @@
   this.disconnect = function () {
-    messager.disconnect(token);
+    bus.disconnect(token);
   };
-  this.send = messager.send;
+  this.send = bus.send;
 
@@ -99,0 +99,0 @@ // return a promise

lib/block/Decision.js

@@ -37,2 +37,6 @@ 'use strict';
  *
+ * There is one special id for choices: 'default'. This id is called when either
+ * the decision function returns an id which does not match any of the available
+ * choices.
+ *
  * @param arg1
@@ -87,2 +91,3 @@ * @param arg2
 Decision.prototype = Object.create(Block.prototype);
+Decision.prototype.constructor = Decision;
 
@@ -104,2 +109,7 @@ /**
     if (!next) {
+      // there is no match, fall back on the default choice
+      next = me.choices['default'];
+    }
+
+    if (!next) {
       throw new Error('Block with id "' + id + '" not found');
@@ -116,4 +126,6 @@ }
 /**
- * Add a choice to the decision block
- * @param {String} id
+ * Add a choice to the decision block.
+ * The choice can be a new chain of blocks. The first block of the chain
+ * will be triggered when the this id comes out of the decision function.
+ * @param {String | 'default'} id
  * @param {Block} block
@@ -135,4 +147,10 @@ * @return {Decision} self
 
-  this.choices[id] = block;
+  // find the first block of the chain
+  var first = block;
+  while (first && first.previous) {
+    first = first.previous;
+  }
 
+  this.choices[id] = first;
+
   return this;
@@ -168,2 +186,6 @@ };
  *
+ * There is one special id for choices: 'default'. This id is called when either
+ * the decision function returns an id which does not match any of the available
+ * choices.
+ *
  * @param {Function | Object} arg1  Can be {function} decision or {Object} choices
@@ -170,0 +192,0 @@ * @param {Object} [arg2]           choices

lib/block/IIf.js

@@ -130,3 +130,3 @@ 'use strict';
  * @param {Block} [falseBlock]
- * @returns {Block}
+ * @returns {Block} Returns the created IIf block
  */
@@ -133,0 +133,0 @@ Block.prototype.iif = function (condition, trueBlock, falseBlock) {

lib/block/Listen.js

@@ -45,3 +45,2 @@ 'use strict';
  * Create a Listen block and chain it to the current block
- * Returns the first block in the chain.
  *
@@ -53,3 +52,3 @@ * Optionally a callback function can be provided, which is equivalent of
  *                              Must return a result
- * @return {Block} first        First block in the chain
+ * @return {Block}              Returns the appended block
  */
@@ -56,0 +55,0 @@ Block.prototype.listen = function (callback) {

lib/block/Tell.js

@@ -69,3 +69,2 @@ 'use strict';
  * Create a Tell block and chain it to the current block
- * Returns the first block in the chain.
  * @param {* | Function} [message] A static message or callback function
@@ -79,3 +78,3 @@ *                                 returning a message dynamically.
  *                                 conversation.
- * @return {Block} first        First block in the chain
+ * @return {Block}                 Returns the appended block
  */
@@ -98,3 +97,3 @@ Block.prototype.tell = function (message) {
  *                              of doing `listen().then(callback)`
- * @return {Block} block        Last block in the created control flow
+ * @return {Block}              Returns the appended block
  */
@@ -101,0 +100,0 @@ Block.prototype.ask = function (message, callback) {

lib/block/Then.js

@@ -53,4 +53,3 @@ 'use strict';
 /**
- * Chain a block to the current block. The new block is appended to the *last*
- * block in the chain, and the function returns the *first* block in the chain.
+ * Chain a block to the current block.
  *
@@ -62,4 +61,4 @@ * When a function is provided, a Then block will be generated which
  *
- * @param {Block | function} next
- * @return {Block} first  First block in the chain
+ * @param {Block | function} next   A callback function or Block.
+ * @return {Block} Returns the appended block
  */
@@ -76,22 +75,10 @@ Block.prototype.then = function (next) {
 
-  // find the last block in the chain
-  var last = this;
-  while (last.next) {
-    last = last.next;
-  }
-
-  // find the first block in the chain.
-  var first = this;
-  while (first.previous) {
-    first = first.previous;
-  }
-
   // append after the last block
   next.previous = this;
-  last.next = next;
+  this.next = next;
 
-  // return the first block
-  return first;
+  // return the appended block
+  return next;
 };
 
 module.exports = Then;

package.json

 {
   "name": "babble",
-  "version": "0.8.0",
+  "version": "0.9.0",
   "description": "Dynamic communication flows between message based actors.",
@@ -5,0 +5,0 @@ "author": "Jos de Jong <[e-mail]> (https://github.com/josdejong)",

README.md

@@ -13,6 +13,6 @@ # Babble
 
-Babble uses customizable messaging to communicate between actors. It comes with
-built in support to communicate locally, and has as support for
-[pubnub](http://www.pubnub.com/) to connect actors distributed over multiple
-devices.
+Babblers communicate with each other via a message bus. Babble comes with 
+built in support for a local message bus, and [pubnub](http://www.pubnub.com/) 
+to connect actors distributed over multiple devices. Its easy to add support
+for other message buses.
 
@@ -240,8 +240,12 @@ Babble runs in node.js and in the browser.
   The function `decision` can also return a Promise resolving with an id for the 
-  next block.
-  If `decision` is not provided, the next block will be mapped directly from the
-  `response`. Parameter `choices` is a map with the possible next blocks in the
-  flow. The next block is selected by the id returned by the `decision` function.
+  next block. When `decision` is not provided, the next block will be mapped 
+  directly from the `response`, which should be a string in that case. 
+  
+  Parameter `choices` is a map with the possible next blocks in the flow. 
+  The next block is selected by the id returned by the `decision` function.
   The returned block is used as next block in the control flow.
 
+  When there is no matching choice, the choice `'default'` will be selected
+  when available.
+
 - `babble.iif(condition: function | RegExp | * [, trueBlock : Block] [, falseBlock : Block]) : Block`  
@@ -302,3 +306,3 @@ Create a control flow starting with an `IIf` block.
 message bus. The connection can replaced with another message bus using the
-function `Babbler.connect(messager)`.
+function `Babbler.connect(bus)`.
 
@@ -311,11 +315,11 @@ A babbler has the following functions:
 
-- `connect([messager: Object]) : Promise.<Babbler>`  
-  Connect to a messaging system. Babble comes with interfaces to support various
-  messaging systems: `pubnub`, `pubsub-js`, and `default`. These interfaces are
-  available in the `babble.messagers` namespace.  If parameter `messager` is not
-  provided, babble uses the `default` messaging system, which works locally.
-  A messaging system can be specified like:
+- `connect([bus: Object]) : Promise.<Babbler>`  
+  Connect to a message bus. Babble comes with interfaces to support various
+  message buses: `pubnub`, `pubsub-js`, and `default`. These interfaces are
+  available in the `babble.messagebus` namespace.  If parameter `bus` is
+  not provided, babble uses the `default` message bus, which works locally.
+  A specific message bus interface can be specified like:
 
   ```js
-  babbler.connect(babble.messagers['pubnub'])
+  babbler.connect(babble.messagebus['pubnub'])
       .then(function (babbler) {
@@ -328,5 +332,8 @@ // connected
   when the connection is ready.
+  
+  See section [Message bus](#message_bus) for documentation on the interface
+  of a message bus.
 
 - `disconnect()`  
-  Disconnect from the connected messaging system.
+  Disconnect from the connected message bus.
 
@@ -368,11 +375,9 @@ - `listen([condition: Function | RegExp | * [, callback: Function]]) : Block`
   Parameter `message` can be a callback function or an object or value. 
-  Returns the first block in the chain.
 
 - `decide([decision: function, ] choices: Object<String, Block>) : Block`  
-  Append a `Decision` block to the control flow. Returns the first block in the
-  chain.
+  Append a `Decision` block to the control flow. 
 
 - `iif(condition: function | RegExp | * [, trueBlock : Block] [, falseBlock : Block]) : Block`  
-  Append an `IIf` block to the control flow. Returns the first block in the
-  chain. When the condition evaluates `true`, `trueBlock` is executed. 
+  Append an `IIf` block to the control flow. 
+  When the condition evaluates `true`, `trueBlock` is executed. 
   If no `trueBlock` is provided, the next block in the chain will be executed.
@@ -382,9 +387,8 @@ When the condition evaluates `true`, `falseBlock` is executed.
 - `listen([callback: Function]) : Block`  
-  Append a `Listen` block to the control flow. Returns the first block in the
-  chain. Providing a callback function is equivalent of doing 
-  `listen().then(callback)`.
+  Append a `Listen` block to the control flow. Providing a callback function is 
+  equivalent of doing `listen().then(callback)`.
 
 - `tell(message: * | Function) : Block`  
   Append a `Tell` block to the control flow. Parameter `message` can be callback
-  function or an object or value. Returns the first block in the chain.
+  function or an object or value.
 
@@ -394,5 +398,60 @@ - `then(block : Block | function) : Block`
   provided, it is wrapped into a `Then` block and added to the chain.
-  Returns the first block in the chain.
 
 
+## Message bus
+
+Babblers talk to each other via a message bus. This can be any message bus 
+implementation. Babble comes with support for two message buses: a local
+message bus and [pubnub](http://www.pubnub.com/).
+
+### Interface
+
+The function `Babbler.connect(bus)` accepts a message bus interface. This
+interface must be an Object with the following functions:
+
+- `connect(params: Object) : string`  
+  The function `connect` will be called by the Babbler with an object having 
+  the following parameters: 
+  - `id` the id of the babbler itself.
+  - `message` the callback function to deliver messages for this babbler.
+    This function must be invoked as `message(msg : *)`.
+  - `callback` an optional callback function which is invoked when the 
+    connection is established.
+  The `connect` function must return a token which can be used to disconnect
+  again.
+
+- `disconnect(token: string)`  
+  Disconnect from a message bus. `token` is the token returned by the `connect`
+  function.
+  
+- `send(id: string, message: *)`
+   Send a message to a babbler.
+
+### Protocol
+
+The messages sent between babblers are JSON objects having the following properties:
+
+- `id: string`  
+  A unique identifier for the conversation, typically a uuid. 
+  This id is generated by the initiator of a conversation, and is sent with
+  every message between the two babblers during the conversation.
+- `from: string`  
+  The id of the sender.
+- `to: string`  
+  The id of the receiver.
+- `message: *`  
+  The message contents. This is a (serializable) JSON object (often a string).
+
+Example:
+
+```json
+{
+  "id": "547d1840-2142-11e4-8c21-0800200c9a66",
+  "from": "babbler1",
+  "to": "babbler2",
+  "message": "Hello babbler!"
+}
+```
+
+
 ## Build
@@ -424,8 +483,6 @@
 
-# To do
+# Roadmap
 
 - Implement error handling and timeout conditions.
-- Implement support for returning promises from callbacks, allowing async 
-  callback functions.
 - Store message history in the context.
 - Implement conversations with multiple peers at the same time.

test/babble.test.js

@@ -11,3 +11,3 @@ var assert = require('assert');
 
-describe('babbler', function() {
+describe('babble', function() {
 
@@ -30,4 +30,4 @@ it('should create a babbler', function() {
     var block = babble.ask('what is your name');
-    assert.ok(block instanceof Tell);
-    assert.ok(block.next instanceof Listen);
+    assert.ok(block instanceof Listen);
+    assert.ok(block.previous instanceof Tell);
   });
@@ -34,0 +34,0 @@

test/block/Decision.test.js

@@ -59,20 +59,36 @@ var assert = require('assert');
 
-  it('should throw an error when decision function returns a non existing id', function () {
-    assert.throws(function () {
-      Decision(function () {
-        return 'non existing id'
-      }, {
-        yes: new Block(),
-        no: new Block()
-      })
-    }, Error);
+  it('should throw an error when no matching choice', function () {
+    var decision = new Decision(function () {
+      return 'non existing id'
+    }, {
+      yes: new Block(),
+      no: new Block()
+    });
+
+    var conversation = new Conversation();
+    return decision.execute(conversation)
+        .then(function (next) {
+          assert.ok(false, 'should not succeed')
+        })
+        .catch(function (err) {
+          assert.equal(err.toString(), 'Error: Block with id "non existing id" not found');
+        })
   });
 
-  it('should throw an error when decision function doesn\'t return a string', function () {
-    assert.throws(function () {
-      var decision = new Decision(function () {
-        return 123
-      }, {});
-      decision.execute();
-    }, TypeError);
+  it('should fallback to default when no matching choice', function () {
+    var def = new Block();
+    var decision = new Decision(function () {
+      return 'non existing id'
+    }, {
+      yes: new Block(),
+      no: new Block(),
+      'default': def
+    });
+
+    var conversation = new Conversation();
+    return decision.execute(conversation)
+        .then(function (next) {
+          assert.strictEqual(next.result, undefined);
+          assert.strictEqual(next.block, def);
+        });
   });
@@ -79,0 +95,0 @@

test/block/Listen.test.js

@@ -73,7 +73,12 @@ var assert = require('assert');
     };
-    var listen = block.listen(callback);
+    var b = block.listen(callback);
 
-    assert(block.next instanceof Listen);
-    assert(listen.next.next instanceof Then);
+    var listen = block.next;
+    var then = listen.next;
 
+    assert.strictEqual(b, then);
+    assert(listen instanceof Listen);
+    assert(then instanceof Then);
+    assert.strictEqual(then.next, undefined); // TODO: should be null
+
     var conversation = new Conversation();
@@ -80,0 +85,0 @@ conversation.deliver({message: 'foo'});

No alert changes

Improved metrics

Total package byte prevSize

570311

increased by0.63%

Lines of code

7749

increased by0.49%

Number of lines in readme file

480

increased by13.48%

No dependency changes