[android-components](../../index.md) / [mozilla.components.concept.engine](../index.md) / [Engine](./index.md)

# Engine

`interface Engine` [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/concept/engine/src/main/java/mozilla/components/concept/engine/Engine.kt#L18)

Entry point for interacting with the engine implementation.

### Types

| Name | Summary |
|---|---|
| [BrowsingData](-browsing-data/index.md) | `class BrowsingData`<br>Describes a combination of browsing data types stored by the engine. |

### Properties

| Name | Summary |
|---|---|
| [settings](settings.md) | `abstract val settings: `[`Settings`](../-settings/index.md)<br>Provides access to the settings of this engine. |
| [version](version.md) | `abstract val version: `[`EngineVersion`](../../mozilla.components.concept.engine.utils/-engine-version/index.md)<br>Returns the version of the engine as [EngineVersion](../../mozilla.components.concept.engine.utils/-engine-version/index.md) object. |

### Functions

| Name | Summary |
|---|---|
| [clearData](clear-data.md) | `open fun clearData(data: `[`BrowsingData`](-browsing-data/index.md)` = BrowsingData.all(), host: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`? = null, onSuccess: () -> `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)` = { }, onError: (`[`Throwable`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-throwable/index.html)`) -> `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)` = { }): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Clears browsing data stored by the engine. |
| [createSession](create-session.md) | `abstract fun createSession(private: `[`Boolean`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html)` = false): `[`EngineSession`](../-engine-session/index.md)<br>Creates a new engine session. |
| [createSessionState](create-session-state.md) | `abstract fun createSessionState(json: <ERROR CLASS>): `[`EngineSessionState`](../-engine-session-state/index.md)<br>Create a new [EngineSessionState](../-engine-session-state/index.md) instance from the serialized JSON representation. |
| [createView](create-view.md) | `abstract fun createView(context: <ERROR CLASS>, attrs: <ERROR CLASS>? = null): `[`EngineView`](../-engine-view/index.md)<br>Creates a new view for rendering web content. |
| [installWebExtension](install-web-extension.md) | `open fun installWebExtension(id: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`, url: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`, allowContentMessaging: `[`Boolean`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html)` = true, onSuccess: (`[`WebExtension`](../../mozilla.components.concept.engine.webextension/-web-extension/index.md)`) -> `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)` = { }, onError: (`[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`, `[`Throwable`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-throwable/index.html)`) -> `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)` = { _, _ -> }): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Installs the provided extension in this engine. |
| [name](name.md) | `abstract fun name(): `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)<br>Returns the name of this engine. The returned string might be used in filenames and must therefore only contain valid filename characters. |
| [speculativeConnect](speculative-connect.md) | `abstract fun speculativeConnect(url: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Opens a speculative connection to the host of [url](speculative-connect.md#mozilla.components.concept.engine.Engine$speculativeConnect(kotlin.String)/url). |
| [warmUp](warm-up.md) | `open fun warmUp(): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Makes sure all required engine initialization logic is executed. The details are specific to individual implementations, but the following must be true: |

### Inheritors

| Name | Summary |
|---|---|
| [GeckoEngine](../../mozilla.components.browser.engine.gecko/-gecko-engine/index.md) | `class GeckoEngine : `[`Engine`](./index.md)<br>Gecko-based implementation of Engine interface. |
| [ServoEngine](../../mozilla.components.browser.engine.servo/-servo-engine/index.md) | `class ServoEngine : `[`Engine`](./index.md)<br>Servo-based implementation of the Engine interface. |
| [SystemEngine](../../mozilla.components.browser.engine.system/-system-engine/index.md) | `class SystemEngine : `[`Engine`](./index.md)<br>WebView-based implementation of the Engine interface. |
