FlutterEngineGroupCache

java.lang.Object
- io.flutter.embedding.engine.FlutterEngineGroupCache

```
public class FlutterEngineGroupCache
extends Object
```
Static singleton cache that holds FlutterEngineGroup instances identified by Strings.
The ID of a given FlutterEngineGroup can be whatever String is desired.
FlutterActivity and FlutterFragment use the FlutterEngineGroupCache singleton internally when instructed to use a cached FlutterEngineGroup based on a given ID. See FlutterActivity.NewEngineInGroupIntentBuilder and FlutterFragment.withNewEngineInGroup(String) for related APIs.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clear()`	Removes all `FlutterEngineGroup`'s that are currently in the cache.
`boolean`	`contains(String engineGroupId)`	Returns `true` if a `FlutterEngineGroup` in this cache is associated with the given `engineGroupId`.
`FlutterEngineGroup`	`get(String engineGroupId)`	Returns the `FlutterEngineGroup` in this cache that is associated with the given `engineGroupId`, or `null` is no such `FlutterEngineGroup` exists.
`static FlutterEngineGroupCache`	`getInstance()`	Returns the static singleton instance of `FlutterEngineGroupCache`.
`void`	`put(String engineGroupId, FlutterEngineGroup engineGroup)`	Places the given `FlutterEngineGroup` in this cache and associates it with the given `engineGroupId`.
`void`	`remove(String engineGroupId)`	Removes any `FlutterEngineGroup` that is currently in the cache that is identified by the given `engineGroupId`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - getInstance
```
@NonNull
public static FlutterEngineGroupCache getInstance()
```
    Returns the static singleton instance of FlutterEngineGroupCache.
    Creates a new instance if one does not yet exist.
  - contains
```
public boolean contains(@NonNull
                        String engineGroupId)
```
    Returns true if a FlutterEngineGroup in this cache is associated with the given engineGroupId.
  - get
```
@Nullable
public FlutterEngineGroup get(@NonNull
                              String engineGroupId)
```
    Returns the FlutterEngineGroup in this cache that is associated with the given engineGroupId, or null is no such FlutterEngineGroup exists.
  - put
```
public void put(@NonNull
                String engineGroupId,
                @Nullable
                FlutterEngineGroup engineGroup)
```
    Places the given FlutterEngineGroup in this cache and associates it with the given engineGroupId.
    If a FlutterEngineGroup is null, that FlutterEngineGroup is removed from this cache.
  - remove
```
public void remove(@NonNull
                   String engineGroupId)
```
    Removes any FlutterEngineGroup that is currently in the cache that is identified by the given engineGroupId.
  - clear
```
public void clear()
```
    Removes all FlutterEngineGroup's that are currently in the cache.