# Class: EventBus

## vertx-js/event_bus~ EventBus

#### new EventBus()

  A Vert.x event-bus is a light-weight distributed messaging system which allows different parts of your application, or different applications and services to communicate with each in a loosely coupled way.

  An event-bus supports publish-subscribe messaging, point-to-point messaging and request-response messaging.

  Message delivery is best-effort and messages can be lost if failure of all or part of the event bus occurs.

  Please refer to the documentation for more information on the event bus.

  Source:
    - event_bus.js, line 41

### Methods

#### close(completionHandler)

  Close the event bus and release any resources held

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `completionHandler` | function | may be `null`

  Source:
    - event_bus.js, line 201

#### consumer(address, handler) → {MessageConsumer}

  Create a consumer and register it against the specified address.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `address` | string | the address that will register it at
  `handler` | function | the handler that will process the received messages

  Source:
    - event_bus.js, line 129

  ##### Returns:

  the event bus message consumer
  Type
    MessageConsumer

#### isMetricsEnabled() → {boolean}

  Whether the metrics are enabled for this measured object
  Source:
    - event_bus.js, line 54

  ##### Returns:

  true if the metrics are enabled
  Type
    boolean

#### localConsumer(address, handler) → {MessageConsumer}

  Like EventBus#consumer but the address won't be propagated across the cluster.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `address` | string | the address that will register it at
  `handler` | function | the handler that will process the received messages

  Source:
    - event_bus.js, line 148

  ##### Returns:

  the event bus message consumer
  Type
    MessageConsumer

#### publish(address, message, options) → {EventBus}

  Like EventBus#publish but specifying `options` that can be used to configure the delivery.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `address` | string | the address to publish it to
  `message` | Object | the message, may be `null`
  `options` | Object | the delivery options

  Source:
    - event_bus.js, line 110

  ##### Returns:

  a reference to this, so the API can be used fluently
  Type
    EventBus

#### publisher(address, options) → {MessageProducer}

  Like EventBus#publisher but specifying delivery options that will be used for configuring the delivery of the message.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `address` | string | the address to publish it to
  `options` | Object | the delivery options

  Source:
    - event_bus.js, line 186

  ##### Returns:

  The publisher
  Type
    MessageProducer

#### send(address, message, options, replyHandler) → {EventBus}

  Like EventBus#send but specifying a `replyHandler` that will be called if the recipient subsequently replies to the message.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `address` | string | the address to send it to
  `message` | Object | the message, may be `null`
  `options` | Object | delivery options
  `replyHandler` | function | reply handler will be called when any reply from the recipient is received, may be `null`

  Source:
    - event_bus.js, line 72

  ##### Returns:

  a reference to this, so the API can be used fluently
  Type
    EventBus

#### sender(address, options) → {MessageProducer}

  Like EventBus#sender but specifying delivery options that will be used for configuring the delivery of the message.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `address` | string | the address to send it to
  `options` | Object | the delivery options

  Source:
    - event_bus.js, line 168

  ##### Returns:

  The sender
  Type
    MessageProducer