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+[![Build Status](https://secure.travis-ci.org/orchestrator/orchestrator.svg?branch=master)](https://travis-ci.org/orchestrator/orchestrator)
+[![Dependency Status](https://david-dm.org/orchestrator/orchestrator.svg)](https://david-dm.org/orchestrator/orchestrator)
+
+Orchestrator
+============
+
+A module for sequencing and executing tasks and dependencies in maximum concurrency
+
+Usage
+-----
+
+### 1. Get a reference:
+
+```javascript
+var Orchestrator = require('orchestrator');
+var orchestrator = new Orchestrator();
+```
+
+### 2. Load it up with stuff to do:
+
+```javascript
+orchestrator.add('thing1', function(){
+  // do stuff
+});
+orchestrator.add('thing2', function(){
+  // do stuff
+});
+```
+
+### 3. Run the tasks:
+
+```javascript
+orchestrator.start('thing1', 'thing2', function (err) {
+  // all done
+});
+```
+
+API
+---
+
+### orchestrator.add(name[, deps][, function]);
+
+Define a task
+
+```javascript
+orchestrator.add('thing1', function(){
+  // do stuff
+});
+```
+
+#### name
+Type: `String`
+
+The name of the task.
+
+#### deps
+Type: `Array`
+
+An array of task names to be executed and completed before your task will run.
+
+```javascript
+orchestrator.add('mytask', ['array', 'of', 'task', 'names'], function() {
+  // Do stuff
+});
+```
+
+**Note:** Are your tasks running before the dependencies are complete?  Make sure your dependency tasks
+are correctly using the async run hints: take in a callback or return a promise or event stream.
+
+#### fn
+Type: `function`
+
+The function that performs the task's operations.  For asynchronous tasks, you need to provide a hint when the task is complete:
+
+- Take in a callback
+- Return a stream or a promise
+
+#### examples:
+
+**Accept a callback:**
+
+```javascript
+orchestrator.add('thing2', function(callback){
+  // do stuff
+  callback(err);
+});
+```
+
+**Return a promise:**
+
+```javascript
+var Q = require('q');
+
+orchestrator.add('thing3', function(){
+  var deferred = Q.defer();
+
+  // do async stuff
+  setTimeout(function () {
+    deferred.resolve();
+  }, 1);
+
+  return deferred.promise;
+});
+```
+
+**Return a stream:** (task is marked complete when stream ends)
+
+```javascript
+var map = require('map-stream');
+
+orchestrator.add('thing4', function(){
+  var stream = map(function (args, cb) {
+    cb(null, args);
+  });
+  // do stream stuff
+  return stream;
+});
+```
+
+**Note:** By default, tasks run with maximum concurrency -- e.g. it launches all the tasks at once and waits for nothing.
+If you want to create a series where tasks run in a particular order, you need to do two things:
+
+- give it a hint to tell it when the task is done,
+- and give it a hint that a task depends on completion of another.
+
+For these examples, let's presume you have two tasks, "one" and "two" that you specifically want to run in this order:
+
+1. In task "one" you add a hint to tell it when the task is done.  Either take in a callback and call it when you're
+done or return a promise or stream that the engine should wait to resolve or end respectively.
+
+2. In task "two" you add a hint telling the engine that it depends on completion of the first task.
+
+So this example would look like this:
+
+```javascript
+var Orchestrator = require('orchestrator');
+var orchestrator = new Orchestrator();
+
+// takes in a callback so the engine knows when it'll be done
+orchestrator.add('one', function (cb) {
+    // do stuff -- async or otherwise
+    cb(err); // if err is not null or undefined, the orchestration will stop, and note that it failed
+});
+
+// identifies a dependent task must be complete before this one begins
+orchestrator.add('two', ['one'], function () {
+    // task 'one' is done now
+});
+
+orchestrator.start('one', 'two');
+```
+
+### orchestrator.hasTask(name);
+
+Have you defined a task with this name?
+
+#### name
+Type: `String`
+
+The task name to query
+
+### orchestrator.start(tasks...[, cb]);
+
+Start running the tasks
+
+#### tasks
+Type: `String` or `Array` of `String`s
+
+Tasks to be executed. You may pass any number of tasks as individual arguments.
+
+#### cb
+Type: `function`: `function (err) {`
+
+Callback to call after run completed.
+
+Passes single argument: `err`: did the orchestration succeed?
+
+**Note:** Tasks run concurrently and therefore may not complete in order.
+**Note:** Orchestrator uses `sequencify` to resolve dependencies before running, and therefore may not start in order.
+Listen to orchestration events to watch task running.
+
+```javascript
+orchestrator.start('thing1', 'thing2', 'thing3', 'thing4', function (err) {
+  // all done
+});
+```
+```javascript
+orchestrator.start(['thing1','thing2'], ['thing3','thing4']);
+```
+
+**FRAGILE:** Orchestrator catches exceptions on sync runs to pass to your callback
+but doesn't hook to process.uncaughtException so it can't pass those exceptions
+to your callback
+
+**FRAGILE:** Orchestrator will ensure each task and each dependency is run once during an orchestration run
+even if you specify it to run more than once. (e.g. `orchestrator.start('thing1', 'thing1')`
+will only run 'thing1' once.) If you need it to run a task multiple times, wait for
+the orchestration to end (start's callback) then call start again.
+(e.g. `orchestrator.start('thing1', function () {orchestrator.start('thing1');})`.)
+Alternatively create a second orchestrator instance.
+
+### orchestrator.stop()
+
+Stop an orchestration run currently in process
+
+**Note:** It will call the `start()` callback with an `err` noting the orchestration was aborted
+
+### orchestrator.on(event, cb);
+
+Listen to orchestrator internals
+
+#### event
+Type: `String`
+
+Event name to listen to:
+- start: from start() method, shows you the task sequence
+- stop: from stop() method, the queue finished successfully
+- err: from stop() method, the queue was aborted due to a task error
+- task_start: from _runTask() method, task was started
+- task_stop: from _runTask() method, task completed successfully
+- task_err: from _runTask() method, task errored
+- task_not_found: from start() method, you're trying to start a task that doesn't exist
+- task_recursion: from start() method, there are recursive dependencies in your task list
+
+#### cb
+Type: `function`: `function (e) {`
+
+Passes single argument: `e`: event details
+
+```javascript
+orchestrator.on('task_start', function (e) {
+  // e.message is the log message
+  // e.task is the task name if the message applies to a task else `undefined`
+  // e.err is the error if event is 'err' else `undefined`
+});
+// for task_end and task_err:
+orchestrator.on('task_stop', function (e) {
+  // e is the same object from task_start
+  // e.message is updated to show how the task ended
+  // e.duration is the task run duration (in seconds)
+});
+```
+
+**Note:** fires either *stop or *err but not both.
+
+### orchestrator.onAll(cb);
+
+Listen to all orchestrator events from one callback
+
+#### cb
+Type: `function`: `function (e) {`
+
+Passes single argument: `e`: event details
+
+```javascript
+orchestrator.onAll(function (e) {
+  // e is the original event args
+  // e.src is event name
+});
+```
+
+LICENSE
+-------
+
+(MIT License)
+
+Copyright (c) 2013 [Richardson & Sons, LLC](http://richardsonandsons.com/)
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.