Eccenca Message Bus for inter-component and in-app communications

ecc-messagebus exports a normal rxmq.js instance but with a set of additional functions.
One of those functions is the createChannels helper.
For convenience reasons it also exports Rx so that we can use a fixed Rx version in all components.

Using Rx

``js
import {Rx} from 'ecc-messagebus';

var source = Rx.Observable.just(42);

var subscription = source.subscribe(
function (x) {
console.log(Next: ${x}');
},
function (err) {
console.log(Error: ${err});
},
function () {
console.log('Completed');
});

// => Next: 42
// => Completed

``

Using request-response

Request-response pattern can be used like so:

`js
import rxmq from 'ecc-messagebus';
// ...
// get channel
const channel = rxmq.channel('yourChannel');
// subscribe to topic
channel.subject('someTopic').subscribe(({data, replySubject}) => {
// ...
// use envelop.reply to send response
replySubject.onNext({some: 'response'});
replySubject.onCompleted();
});
// ...
// initiate request and handle response as a promise
channel.request({
topic: 'someTopic',
data: {test: 'test'},
timeout: 2000
})
.subscribe((data) => {
// work with data here
// ...
},
(err) => {
// catch and handle error here
// ...
});
`

Creating Channel Definitions

The createChannels functions allows to define channels and subjects.
Basically it allows to create a channelDefinition with private and public subjects.
The Channel of Private Subjects can be changed.
This may sound counter-intuitive, but is actually a nice wrapper around changing channels.
This helper is predominantly used within the ecc-mixins to create an event-bus per component instance,
so that there are no side effects (two components reacting on the same click handler)

`

// in a channelDefinition.js

import {createChannels, SubjectType} from 'ecc-messagebus'

const {privateChannel, publicChannel} = createChannels({
name: 'component',
subjects: {
secretMessage: SubjectType.private,
update: SubjectType.public,
}
});

export {privateChannel, publicChannel};

// in Component A

import {publicChannel, privateChannel} from './channelDefinition.js';

// Handle public messages
publicChannel.update.getSubject().subscribe(() => {
console.log('There was an update');
});

// Handle Secret Message from Component B
publicChannel.secretMessage.getSubject('secret-key-b').subscribe(() => {
console.log('Uuuuuh, a secret message from Component B');
});

// Handle Secret Message from Component C
publicChannel.secretMessage.getSubject('secret-key-c').subscribe(() => {
console.log('Uuuuuh, a secret message from Component C');
});

// in Component B

import {privateChannel} from './channelDefinition.js';

// Send to Component A on Secret Channel
publicChannel.secretMessage.getSubject('secret-key-b').onNext('pssst, component A');

// in Component C

import {privateChannel} from './channelDefinition.js';

// Send to Component A on Secret Channel
publicChannel.secretMessage.getSubject('secret-key-c').onNext('pssst, component A');

``