babble - npm Package Compare versions

Comparing version 0.4.0 to 0.5.0

dist/babble.min.js

@@ -1,3 +0,3 @@
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a,u=f[r],s=o?e:n;if(f.hasOwnProperty(r))for(a=0;a<u.length;a++)s(u[a].func,t,i)}function i(t,n,e){return function(){var i=String(t),o=i.lastIndexOf(".");for(r(t,t,n,e);-1!==o;)i=i.substr(0,o),o=i.lastIndexOf("."),r(t,i,n)}}function o(t){for(var n=String(t),e=f.hasOwnProperty(n),r=n.lastIndexOf(".");!e&&-1!==r;)n=n.substr(0,r),r=n.lastIndexOf("."),e=f.hasOwnProperty(n);return e&&f[n].length>0}function a(t,n,e,r){var a=i(t,n,r),u=o(t);return u?(e===!0?a():setTimeout(a,0),!0):!1}var u={},f={},s=-1;return u.publish=function(t,n){return a(t,n,!1,u.immediateExceptions)},u.publishSync=function(t,n){return a(t,n,!0,u.immediateExceptions)},u.subscribe=function(t,n){if("function"!=typeof n)return!1;f.hasOwnProperty(t)||(f[t]=[]);var e=String(++s);return f[t].push({token:e,func:n}),e},u.unsubscribe=function(t){var n,e,r="string"==typeof t,i=r?"token":"func",o=r?t:!0,a=!1;for(n in f)if(f.hasOwnProperty(n))for(e=f[n].length-1;e>=0;e--)if(f[n][e][i]===t&&(f[n].splice(e,1),a=o,r))return a;return a},u})},{}]},{},[1])(1)});
 //# sourceMappingURL=./babble.min.map

examples/guess_the_number.js

@@ -55,10 +55,10 @@ var babble = require('../index');
   var check = babble.decide(decideIfCorrect);
-  check.addChoice('higher', babble.reply(higher).listen().then(check));
-  check.addChoice('lower',  babble.reply(lower).listen().then(check));
-  check.addChoice('right',  babble.reply(right));
+  check.addChoice('higher', babble.tell(higher).listen().then(check));
+  check.addChoice('lower',  babble.tell(lower).listen().then(check));
+  check.addChoice('right',  babble.tell(right));
 
   emma.listen('lets play guess the number')
       .decide(decideToPlay, {
-        start: babble.reply(start).listen().then(check),
-        deny:  babble.reply(deny)
+        start: babble.tell(start).listen().then(check),
+        deny:  babble.tell(deny)
       });
@@ -109,7 +109,7 @@
   checkGuess.addChoice('right', babble.run(triumph));
-  checkGuess.addChoice('wrong', babble.reply(guess).listen().then(checkGuess));
+  checkGuess.addChoice('wrong', babble.tell(guess).listen().then(checkGuess));
 
   jack.ask('emma', 'lets play guess the number')
       .decide(decideToStart, {
-        start:  babble.run(start).reply(guess).listen().then(checkGuess),
+        start:  babble.run(start).tell(guess).listen().then(checkGuess),
         cancel: babble.run(whine)
@@ -116,0 +116,0 @@ });

examples/plan_a_meeting.js

@@ -19,28 +19,13 @@ var babble = require('../index');
 
-function yes() {
-  return 'yes';
-}
-
-function ok () {
-  return 'ok';
-}
-
-function no () {
-  return 'no';
-}
-
 emma.listen('do you have time today?')
     .decide(decideIfAvailable, {
-      yes: babble.reply(yes)
+      yes: babble.tell('yes')
+              .listen()
               .decide(decideToAgree, {
-                ok: babble.reply(ok),
-                no: babble.reply(no)
+                ok: babble.tell('ok'),
+                no: babble.tell('no')
               }),
-      no: babble.reply(no)
+      no: babble.tell('no')
     });
 
-function askToMeet () {
-  return 'can we meet at 15:00?';
-}
-
 function noTime () {
@@ -51,3 +36,3 @@ console.log('emma has no time');
 function agreesToMeet (response) {
-  return (response == 'ok') ? 'ok': 'notOk';
+  return (response == 'ok') ? 'ok': 'no';
 }
@@ -65,8 +50,9 @@
     .decide({
-      yes: babble.reply(askToMeet)
+      yes: babble.tell('can we meet at 15:00?')
+              .listen()
               .decide(agreesToMeet, {
                 ok: babble.run(agreement),
-                notOk: babble.run(noAgreement)
+                no: babble.run(noAgreement)
               }),
       no: babble.run(noTime)
     });

examples/pubnub.js

@@ -25,18 +25,25 @@ var babble = require('../index'),
 function (err, babblers) {
-  babblers.emma.listen('ask age')
-      .reply(function (response) {
-        return 25;
+  babblers.emma.listen('hi')
+      .listen(printMessage)
+      .decide(function (message, context) {
+        return (message.indexOf('age') != -1) ? 'age' : 'name';
+      }, {
+        'name': babble.tell('hi, my name is emma'),
+        'age':  babble.tell('hi, my age is 27')
       });
 
-  babblers.emma.listen('tell age')
-      .run (function (age, context) {
-        console.log(context.from + ' is ' +  age + ' years old');
-      });
+  babblers.jack.tell('emma', 'hi')
+      .tell(function (message, context) {
+        if (Math.random() > 0.5) {
+          return 'my name is jack'
+        } else {
+          return 'my age is 25';
+        }
+      })
+      .listen(printMessage);
+});
 
-  babblers.jack.tell('emma', 'tell age', 27);
-
-  babblers.jack.ask('emma', 'ask age')
-      .run (function (age, context) {
-        console.log(context.from + ' is ' + age + ' years old');
-      });
-});
+function printMessage (message, context) {
+  console.log(context.from + ': ' + message);
+  return message;
+}

HISTORY.md

@@ -5,2 +5,13 @@ # babble history
 
+## not yet released, version 0.5.0
+
+- Messages can now be of any type, not only string.
+- Consistency of API improved.
+
+
+## 2014-01-10, version 0.4.0
+
+- API changed into a chained API.
+
+
 ## 2014-01-03, version 0.3.1
@@ -7,0 +18,0 @@

lib/babble.js

 var Babbler = require('./Babbler'),
 
-    Reply = require('./block/Reply'),
+    Tell = require('./block/Tell'),
     Action = require('./block/Action'),
@@ -17,13 +17,19 @@ Decision = require('./block/Decision');
 /**
- * Create a control flow starting with a reply block
- * @param {Function} callback   Invoked as callback(message, context),
- *                              where `message` is the output from the previous
- *                              block in the chain, and `context` is an object
- *                              where state can be stored during a conversation.
- *                              The result returned by the function will be
- *                              send back to the sender.
- * @return {Reply} reply
+ * Create a control flow starting with a tell block
+ * @param {* | Function} [message] A static message or callback function
+ *                                 returning a message dynamically.
+ *                                 When `message` is a function, it will be
+ *                                 invoked as callback(message, context),
+ *                                 where `message` is the output from the
+ *                                 previous block in the chain, and `context` is
+ *                                 an object where state can be stored during a
+ *                                 conversation.
+ * @return {Tell} tell
  */
-exports.reply = function reply(callback) {
-  return new Reply(callback);
+exports.tell = function tell(message) {
+  var callback = (typeof message === 'function') ? message : function () {
+    return message;
+  };
+
+  return new Tell(callback);
 };
@@ -88,3 +94,3 @@
   Listen: require('./block/Listen'),
-  Reply: require('./block/Reply')
+  Tell: require('./block/Tell')
 };
@@ -91,0 +97,0 @@

lib/Babbler.js

@@ -7,3 +7,3 @@ var uuid = require('node-uuid'),
     Action = require('./block/Action'),
-    Reply = require('./block/Reply'),
+    Tell = require('./block/Tell'),
     Listen = require('./block/Listen');
@@ -71,13 +71,17 @@
     id: this.id,
-    message: function (message) {
-      var conversation, trigger;
-      //console.log('message', me.id, message); // TODO: cleanup
+    message: function (envelope) {
+      var conversation,
+          trigger,
+          message = JSON.parse(envelope.message);
+
+      //console.log('message', me.id, envelope); // TODO: cleanup
+
       // check the open conversations
-      conversation = me.conversations[message.id];
+      conversation = me.conversations[envelope.id];
       if (conversation) {
-        me._run(conversation, message.message);
+        me._run(conversation, message);
       }
       else {
         // check the listeners to start a new conversation
-        trigger = me.listeners[message.message];
+        trigger = me.listeners[message];
         if (trigger) {
@@ -87,11 +91,11 @@ //console.log('message create a new conversation', trigger, trigger.callback); // TODO: cleanup
           conversation = {
-            id: message.id,
-            peer: message.from,
+            id: envelope.id,
+            peer: envelope.from,
             next: trigger,
             context: {
-              from: message.from
+              from: envelope.from
             }
           };
 
-          me._run(conversation, message.data);
+          me._run(conversation, message);
         }
@@ -157,36 +161,15 @@ }
 /**
- * Send a notification
+ * Send a message to the other peer
+ * Creates a block Tell, and runs the block immediately.
  * @param {String} id       Babbler id
- * @param {String} message
- * @param {JSON} [data]     Data must be serializable
+ * @param {Function | *} message
+ * @return {Block} block    Last block in the created control flow
  */
-Babbler.prototype.tell = function tell (id, message, data) {
-  this.publish(id, {
-    from: this.id,
-    to: id,
-    message: message,
-    data: data
-  });
-};
-
-/**
- * Send a question, listen for a response
- * @param {String} id             Babbler id
- * @param {String} message
- * @param {JSON} [data]           Data must be serializable
- * @param {Function} [callback]   Callback called
- * @return {Block} block          Start block for the control flow
- */
-Babbler.prototype.ask = function ask (id, message, data, callback) {
+Babbler.prototype.tell = function tell (id, message) {
   var cid = uuid.v4(); // create an id for this conversation
 
-  if (typeof data === 'function') {
-    callback = data;
-    data = undefined;
-  }
+  var block = new Tell();
 
-  var block = new Listen(callback);
-
   // create a new conversation
-  this.conversations[cid] = {
+  var conversation = {
     id: cid,
@@ -200,10 +183,24 @@ peer: id,
 
-  this.publish(id, {
-    id: cid,
-    from: this.id,
-    to: id,
-    message: message,
-    data: data
-  });
+  // override the `then` function, so we can immediately execute chained blocks
+  // until we encounter a Listen block.
+  var me = this;
+  block.then = function then (next) {
+    conversation.next = next;
 
+    if (next instanceof Listen) {
+      // add to the conversations queue
+      me.conversations[cid] = conversation;
+    }
+    else {
+      // execute immediately
+      message = me._run(conversation, message);
+      next.then = then;
+    }
+
+    return next;
+  };
+
+  // run the Tell block immediately
+  message = this._run(conversation, message);
+
   return block;
@@ -213,9 +210,24 @@ };
 /**
+ * Send a question, listen for a response.
+ * Creates two blocks: Tell and Listen, and runs them immediately.
+ * @param {String} id             Babbler id
+ * @param {* | Function} message
+ * @param {Function} [callback]   Callback called
+ * @return {Block} block          Last block in the created control flow
+ */
+Babbler.prototype.ask = function ask (id, message, callback) {
+  return this
+      .tell(id, message)
+      .listen(callback);
+};
+
+/**
  * Run next block for given conversation
  * @param {Object} conversation
  * @param {*} [message]
+ * @return {*} message    Response returned by the last executed block
  * @private
  */
 Babbler.prototype._run = function _run (conversation, message) {
-  //console.log('_run', conversation, message); // TODO: cleanup
+  // console.log('_run', conversation, message); // TODO: cleanup
 
@@ -229,4 +241,7 @@ // remove the conversation from the queue
     var next = block.execute(message, conversation.context);
+    message = next.result;
 
-    if (block instanceof Reply) {
+    // TODO: only select result as next message when !== undefined?
+
+    if (block instanceof Tell) {
       // send a response back to the other peer
@@ -237,8 +252,7 @@ this.publish(conversation.peer, {
         to: conversation.peer,
-        message: next.result
+        message: JSON.stringify(message)
       });
     }
 
-    message = next.result;
-    block   = next.block;
+    block = next.block;
     //console.log('message', message); // TODO: cleanup
@@ -253,4 +267,6 @@
   while (block && !(block instanceof Listen));
+
+  return message;
 };
 
 module.exports = Babbler;

package.json

 {
   "name": "babble",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "Dynamic communication flows between message based actors.",
@@ -5,0 +5,0 @@ "author": "Jos de Jong <[e-mail]> (https://github.com/josdejong)",

README.md

@@ -6,4 +6,4 @@ # Babble
 Babble makes it easy to code communication flows between actors. A conversation
-is modeled as a control flow diagram containing blocks `listen`, `ask`, `tell`,
-`reply`, `decide`, and `run`. Each block can link to a next block in the
+is modeled as a control flow diagram containing blocks `ask`, `tell`, `listen`,
+`decide`, and `run`. Each block can link to a next block in the
 control flow. Conversations are dynamic: a scenario is build programmatically,
@@ -61,8 +61,7 @@ and the blocks can dynamically determine the next block in the scenario.
 emma.listen('ask age')
-    .reply(function () {
+    .tell(function () {
       return 25;
     }));
 
-jack.ask('emma', 'ask age')
-    .run(function (age, context) {
+jack.ask('emma', 'ask age', function (age, context) {
       console.log(context.from + ' is ' + age + ' years old');
@@ -79,15 +78,15 @@ }));
 
-### Ask a question
+### Say hi
 
 Babble can be used to listen for messages and send a reply. In the following
-example, emma listens for two messages: "ask age" and "tell age". In the first
-case she will reply telling her age, in the second case she just outputs the
-received age. Jack first tells his age, and then asks emma's age, waits for
-her to reply, and then output the received age.
+example, emma listens for a message "hi", then she will listen to the next
+message. Depending on the contents of this second message, she determines how
+to respond. Jack says hi to emma, then tells his name or age, and awaits a
+response from emma.
 
 This scenario can be represented by the following control flow diagram:
 
-![ask age](https://raw.github.com/josdejong/babble/master/img/ask_age.jpg)
+![ask age](https://raw.github.com/josdejong/babble/master/img/say_hi.png)
 
-The scenario is programmed as:
+The scenario can be programmed as:
 
@@ -100,21 +99,28 @@ ```js
 
-emma.listen('ask age')
-    .reply(function () {
-      return 25;
-    });
+function printMessage (message, context) {
+  console.log(context.from + ': ' + message);
+  return message;
+}
 
-emma.listen('tell age')
-    .run(function (age, context) {
-      console.log(context.from + ' is ' +  age + ' years old');
+emma.listen('hi')
+    .listen(printMessage)
+    .decide(function (message, context) {
+      return (message.indexOf('age') != -1) ? 'age' : 'name';
+    }, {
+      'name': babble.tell('hi, my name is emma'),
+      'age':  babble.tell('hi, my age is 27')
     });
 
-jack.tell('emma', 'tell age', 27);
-
-jack.ask('emma', 'ask age')
-    .run(function (age, context) {
-      console.log(context.from + ' is ' + age + ' years old');
-    });
+jack.tell('emma', 'hi')
+    .tell(function (message, context) {
+      if (Math.random() > 0.5) {
+        return 'my name is jack'
+      } else {
+        return 'my age is 25';
+      }
+    })
+    .listen(printMessage);
 ```
 
-### Have a conversation
+### Plan a meeting
 
@@ -127,3 +133,3 @@ The following scenario describes two peers planning a meeting in two steps:
 
-![plan a meeting](https://raw.github.com/josdejong/babble/master/img/plan_a_meeting.jpg)
+![plan a meeting](https://raw.github.com/josdejong/babble/master/img/plan_a_meeting.png)
 
@@ -152,28 +158,13 @@ The scenario can be coded as follows. Note that the implementations of the
 
-function yes() {
-  return 'yes';
-}
-
-function ok () {
-  return 'ok';
-}
-
-function no () {
-  return 'no';
-}
-
 emma.listen('do you have time today?')
     .decide(decideIfAvailable, {
-      yes: babble.reply(yes)
+      yes: babble.tell('yes')
+              .listen()
               .decide(decideToAgree, {
-                ok: babble.reply(ok),
-                no: babble.reply(no)
+                ok: babble.tell('ok'),
+                no: babble.tell('no')
               }),
-      no: babble.reply(no)
+      no: babble.tell('no')
     });
 
-function askToMeet () {
-  return 'can we meet at 15:00?';
-}
-
 function noTime () {
@@ -184,3 +175,3 @@ console.log('emma has no time');
 function agreesToMeet (response) {
-  return (response == 'ok') ? 'ok': 'notOk';
+  return (response == 'ok') ? 'ok': 'no';
 }
@@ -198,9 +189,11 @@
     .decide({
-      yes: babble.reply(askToMeet)
+      yes: babble.tell('can we meet at 15:00?')
+              .listen()
               .decide(agreesToMeet, {
                 ok: babble.run(agreement),
-                notOk: babble.run(noAgreement)
+                no: babble.run(noAgreement)
               }),
       no: babble.run(noTime)
     });
+
 ```
@@ -227,7 +220,8 @@
   The returned block is used as next block in the control flow.
-- `babble.reply(callback: Function) : Block`
-  Create a flow starting with a Reply block. The provided callback function
+- `babble.tell(message: Function | *) : Block`
+  Create a flow starting with a Tell block. Message can be a static value,
+  or a callback function returning a message dynamically. The callback function
   is called as `callback(response, context)`, where `response` is the latest
-  received message, and must return a result. The returned result is send to the
-  connected peer.
+  received message, and must return a result.
+  The returned result is send to the connected peer.
 - `babble.then(block: Block) : Block`
@@ -246,3 +240,3 @@ Create a flow starting with given block. The provided callback function
 - `babble.block.Decision`
-- `babble.block.Reply`
+- `babble.block.Tell`
 - `babble.block.Start`
@@ -278,8 +272,8 @@
 
-- `tell(id: String, message: String [, data: JSON])`
+- `tell(id: String, message: Function | *)`
   Send a notification to another peer.
 
-- `ask(id: String, message: String [,data: JSON] [, callback: Function]) : Block`
-  Send a question to another peer. Returns a `start` Block which is executed
-  When the reply comes in. Other blocks can be chained to the returned block.
+- `ask(id: String, message: String [, callback: Function]) : Block`
+  Send a question to another peer. Other blocks can be chained to the returned
+  block.
 
@@ -289,4 +283,4 @@ ### Block
 Blocks can be created via the factory functions available in `babble`
-(`reply`, `decide`, `run`, `then`, `listen`), or in a Babbler (`listen`, `ask`).
-Blocks can be chained together, resulting in a control flow. The results
+(`tell`, `decide`, `run`, `then`, `listen`), or in a Babbler (`listen`, `tell`,
+`ask`). Blocks can be chained together, resulting in a control flow. The results
 returned by blocks are used as input argument for the next block in the chain.
@@ -299,5 +293,5 @@
   chain.
-- `reply(callback: Function) : Block`
-  Append a Reply block to the control flow. Returns the first block in the
-  chain.
+- `tell(message: *) : 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.
 - `listen([callback: Function]) : Block`
@@ -304,0 +298,0 @@ Append a Listen block to the control flow. Returns the first block in the

test/babble.test.js

@@ -5,3 +5,3 @@ var assert = require('assert'),
 
-    Reply = require('../lib/block/Reply'),
+    Tell = require('../lib/block/Tell'),
     Decision = require('../lib/block/Decision'),
@@ -21,5 +21,5 @@ Action = require('../lib/block/Action');
 
-  it('should create a flow starting with a reply block', function() {
-    var block = babble.reply(function () {});
-    assert.ok(block instanceof Reply);
+  it('should create a flow starting with a tell block', function() {
+    var block = babble.tell(function () {});
+    assert.ok(block instanceof Tell);
   });
@@ -36,4 +36,2 @@
   });
-
-  // TODO: test reply, decide, run
 });

test/Babbler.test.js

 var assert = require('assert'),
     Babbler = require('../lib/Babbler'),
     Block = require('../lib/block/Block'),
-    Reply = require('../lib/block/Reply'),
+    Tell = require('../lib/block/Tell'),
     Action = require('../lib/block/Action'),
@@ -28,3 +28,3 @@ Decision = require('../lib/block/Decision');
 
-  it.skip('should create and destroy a babbler', function() {
+  it('should create and destroy a babbler', function() {
     var susan = new Babbler('susan').subscribe();
@@ -35,3 +35,3 @@ assert.ok(susan instanceof Babbler);
 
-  it.skip('should throw an error when creating a babbler with wrong syntax', function() {
+  it('should throw an error when creating a babbler with wrong syntax', function() {
     assert.throws (function () {new Babbler(); });
@@ -41,6 +41,6 @@ assert.throws (function () {Babbler('whoops'); });
 
-  describe.skip ('listen', function () {
+  describe ('listen', function () {
 
     it ('should listen to a message', function () {
-      emma.listen('test', new Block());
+      emma.listen('test');
 
@@ -57,8 +57,7 @@ assert.equal(Object.keys(emma.listeners).length, 1);
 
-  describe.skip ('tell', function () {
+  describe ('tell', function () {
     
     it('should tell a message', function(done) {
-      emma.listen('test')
-          .run(function (data) {
-            assert.equal(data, null);
+      emma.listen('test', function (response) {
+            assert.equal(response, 'test');
             done();
@@ -70,12 +69,34 @@ });
 
-    it('should tell a message with data', function(done) {
-      emma.listen('test')
-          .run(function (data) {
-            assert.deepEqual(data, {a:2, b:3});
+    it('should tell two messages subsequently', function(done) {
+      emma.listen('foo')
+          .listen(function (response) {
+            assert.deepEqual(response, 'bar');
             done();
           });
 
-      jack.tell('emma', 'test', {a:2, b:3});
+      jack.tell('emma', 'foo')
+          .tell('bar');
     });
 
+    it('should chain some blocks to a Tell block', function(done) {
+      emma.listen('foo')
+          .listen(function (response) {
+            assert.equal(response, 'bar');
+          })
+          .tell('bye');
+
+      jack.tell('emma', 'foo')
+          .run(function (response) {
+            assert.equal(response, 'foo');
+            return 'bar';
+          })
+          .tell(function (response) {
+            return response;
+          })
+          .listen(function (response) {
+            assert.equal(response, 'bye');
+            done();
+          });
+    });
+
   });
@@ -85,10 +106,10 @@
 
-    it('should ask a question and reply', function(done) {
-      emma.listen('add')
-          .reply(function (data) {
-            return data.a + data.b;
+    it('should send a message and listen for a reply', function(done) {
+      emma.listen('what is your name?')
+          .tell(function (message) {
+            return 'emma';
           });
 
-      jack.ask('emma', 'add', {a:2, b:3}, function (result) {
-            assert.equal(result, 5);
+      jack.ask('emma', 'what is your name?', function (result) {
+            assert.equal(result, 'emma');
             done();
@@ -98,5 +119,7 @@ });
 
-    it ('should ask a question, reply, and reply on the reply', function(done) {
-      emma.listen('count')
-          .reply(function (count) {
+    it ('should send a message, listen, and send a reply', function(done) {
+      emma.listen('count', function () {
+            return 0;
+          })
+          .tell(function (count) {
             return count + 1;
@@ -109,4 +132,4 @@ })
 
-      jack.ask('emma', 'count', 0)
-          .reply(function (count) {
+      jack.ask('emma', 'count')
+          .tell(function (count) {
             return count + 2;
@@ -116,14 +139,36 @@ });
 
-    it ('should invoke the callback provided with listen', function(done) {
-      emma.listen('age', function (response) {
-        assert.equal(response, 32);
+    it ('should send an object as reply', function(done) {
+      emma.listen('test')
+          .tell(function (response) {
+            return {a: 2, b: 3}
+          });
+
+      jack.ask('emma', 'test', function (response) {
+        assert.deepEqual(response, {a: 2, b: 3});
         done();
       });
+    });
 
-      jack.tell('emma', 'age', 32);
+    it ('should send an object as reply (2)', function(done) {
+      emma.listen('test')
+          .tell({a: 2, b: 3});
+
+      jack.ask('emma', 'test', function (response) {
+        assert.deepEqual(response, {a: 2, b: 3});
+        done();
+      });
     });
 
+    it ('should invoke the callback provided with listener', function(done) {
+      emma.listen('what is you age?', function (response) {
+        assert.equal(response, 'what is you age?');
+        done();
+      });
+
+      jack.tell('emma', 'what is you age?');
+    });
+
     it ('should invoke the callback provided with ask', function(done) {
       emma.listen('age')
-          .reply(function () {
+          .tell(function () {
             return 32;
@@ -138,18 +183,5 @@ });
 
-    it ('should invoke the callback provided with an ask with data', function(done) {
-      emma.listen('double')
-          .reply(function (value) {
-            return value * 2;
-          });
-
-      jack.ask('emma', 'double', 2, function (response) {
-        assert.equal(response, 4);
-        done();
-      });
-    });
-
     it('should make a decision during a conversation', function(done) {
       emma.listen('are you available?')
-          .reply(function (data) {
-            assert.strictEqual(data, undefined);
+          .tell(function (response) {
             return 'yes';
@@ -177,3 +209,3 @@ });
           })
-          .reply(function (response) {
+          .tell(function (response) {
             logs.push('log 2');
@@ -198,3 +230,5 @@ assert.strictEqual(response, undefined);
     it ('should keep state in the context during the conversation', function(done) {
-      emma.listen('question')
+      emma.listen('question', function () {
+            return 'a';
+          })
           .run(function (response, context) {
@@ -210,3 +244,3 @@ context.a = 1;
           }, {
-            first: new Reply(function (response, context) {
+            first: new Tell(function (response, context) {
                   assert.equal(response, 'a');
@@ -228,3 +262,3 @@ assert.equal(context.a, 1);
 
-      jack.ask('emma', 'question', 'a')
+      jack.ask('emma', 'question')
           .run(function (response, context) {
@@ -234,3 +268,3 @@ context.a = 1;
           })
-          .reply(function (response, context) {
+          .tell(function (response, context) {
             assert.equal(response, 'b');
@@ -237,0 +271,0 @@ assert.equal(context.a, 1);

TODO.md

 # TO DO
 
-- Introduce flow blocks Listen and Send?
+- Listen to patterns
 - Implement error handling
 - Implement support for promises to allow async callback functions
 - Store message history in context.
-- What to do with initial message and data, whilst subsequent calls only have
-  message? -> rename this stuff? an initial `event` with optional `message`,
-  and sequential only a `message`.
 - implement conversations with multiple peers at the same time.

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