---
lang: en
title: 'API docs: core.lifecycleobserverregistry'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/core
permalink: /doc/en/lb4/apidocs.core.lifecycleobserverregistry.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [LifeCycleObserverRegistry](./core.lifecycleobserverregistry.md)

## LifeCycleObserverRegistry class

A context-based registry for life cycle observers

**Signature:**

```typescript
export declare class LifeCycleObserverRegistry implements LifeCycleObserver 
```
**Implements:** [LifeCycleObserver](./core.lifecycleobserver.md)

## Constructors

<table><thead><tr><th>

Constructor


</th><th>

Modifiers


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

[(constructor)(context, observersView, options)](./core.lifecycleobserverregistry._constructor_.md)


</td><td markdown="1">


</td><td markdown="1">

Constructs a new instance of the `LifeCycleObserverRegistry` class


</td></tr>
</tbody></table>

## Properties

<table><thead><tr><th>

Property


</th><th>

Modifiers


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

[context](./core.lifecycleobserverregistry.context.md)


</td><td markdown="1">

`protected`

`readonly`


</td><td markdown="1">

[Context](./context.context.md)


</td><td markdown="1">


</td></tr>
<tr><td markdown="1">

[observersView](./core.lifecycleobserverregistry.observersview.md)


</td><td markdown="1">

`protected`

`readonly`


</td><td markdown="1">

[ContextView](./context.contextview.md)<!-- -->&lt;[LifeCycleObserver](./core.lifecycleobserver.md)<!-- -->&gt;


</td><td markdown="1">


</td></tr>
<tr><td markdown="1">

[options](./core.lifecycleobserverregistry.options.md)


</td><td markdown="1">

`protected`

`readonly`


</td><td markdown="1">

[LifeCycleObserverOptions](./core.lifecycleobserveroptions.md)


</td><td markdown="1">


</td></tr>
</tbody></table>

## Methods

<table><thead><tr><th>

Method


</th><th>

Modifiers


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

[getObserverGroup(binding)](./core.lifecycleobserverregistry.getobservergroup.md)


</td><td markdown="1">

`protected`


</td><td markdown="1">

Get the group for a given life cycle observer binding


</td></tr>
<tr><td markdown="1">

[getObserverGroupsByOrder()](./core.lifecycleobserverregistry.getobservergroupsbyorder.md)


</td><td markdown="1">


</td><td markdown="1">

Get observer groups ordered by the group


</td></tr>
<tr><td markdown="1">

[init()](./core.lifecycleobserverregistry.init.md)


</td><td markdown="1">


</td><td markdown="1">

Notify all life cycle observers by group of `init`


</td></tr>
<tr><td markdown="1">

[invokeObserver(observer, event)](./core.lifecycleobserverregistry.invokeobserver.md)


</td><td markdown="1">

`protected`


</td><td markdown="1">

Invoke an observer for the given event


</td></tr>
<tr><td markdown="1">

[notifyGroups(events, groups, reverse)](./core.lifecycleobserverregistry.notifygroups.md)


</td><td markdown="1">

`protected`


</td><td markdown="1">

Emit events to the observer groups


</td></tr>
<tr><td markdown="1">

[notifyObservers(observers, bindings, event)](./core.lifecycleobserverregistry.notifyobservers.md)


</td><td markdown="1">

`protected`


</td><td markdown="1">

Notify an observer group of the given event


</td></tr>
<tr><td markdown="1">

[setOrderedGroups(groups)](./core.lifecycleobserverregistry.setorderedgroups.md)


</td><td markdown="1">


</td><td markdown="1">


</td></tr>
<tr><td markdown="1">

[sortObserverBindingsByGroup(bindings)](./core.lifecycleobserverregistry.sortobserverbindingsbygroup.md)


</td><td markdown="1">

`protected`


</td><td markdown="1">

Sort the life cycle observer bindings so that we can start/stop them in the right order. By default, we can start other observers before servers and stop them in the reverse order


</td></tr>
<tr><td markdown="1">

[start()](./core.lifecycleobserverregistry.start.md)


</td><td markdown="1">


</td><td markdown="1">

Notify all life cycle observers by group of `start`


</td></tr>
<tr><td markdown="1">

[stop()](./core.lifecycleobserverregistry.stop.md)


</td><td markdown="1">


</td><td markdown="1">

Notify all life cycle observers by group of `stop`


</td></tr>
</tbody></table>