# EntityCommandBuffer > A thread-safe command buffer that can buffer commands that affect entities and components for later playback. ## Definition * **Type:** Struct * **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md) * **Assembly:** UnityEngine.EntitiesModule * **Implements:** [IDisposable](https://learn.microsoft.com/dotnet/api/system.idisposable) ```csharp [BurstCompile] public struct EntityCommandBuffer : IDisposable ``` ## Constructors | Constructor | Description | | ----------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------- | | [EntityCommandBuffer(Unity.Collections.AllocatorManager.AllocatorHandle)](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/ctor.md) | Creates a new command buffer. | ## Properties | Property | Description | | ---------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [IsCreated](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/iscreated.md) | Is true if the [EntityCommandBuffer](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer.md) has been initialized correctly. | | [IsEmpty](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/isempty.md) | Returns true if the [EntityCommandBuffer](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer.md) has not been initialized or no commands have been recorded. | | [MinimumChunkSize](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/minimumchunksize.md) | Allows controlling the size of chunks allocated from the temp job allocator to back the command buffer. | | [ShouldPlayback](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/shouldplayback.md) | Controls whether this command buffer should play back. | ## Static Properties | Property | Description | | ------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [PLAYBACK\_WITH\_TRACE](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/playback-with-trace.md) | A static field for logging details during EntityCommandBuffer playback. When set to true, each EntityCommandBuffer will log its commands as they are processed during playback. | ## Methods | Method | Description | | -------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [AddBuffer](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/addbuffer.md) | Records a command to add a dynamic buffer to an entity. | | [AddComponent](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/addcomponent.md) | Records a command to add a component to a NativeArray of entities. | | [AddComponentForLinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/addcomponentforlinkedentitygroup.md) | Records a command that adds a component to an entity's [LinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/linkedentitygroup.md) based on an [EntityQueryMask](/engine/7000.0/script-reference/unity/entities/entityquerymask.md). Entities in the [LinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/linkedentitygroup.md) that don't match the mask will be skipped safely. | | [AddSharedComponent](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/addsharedcomponent.md) | Records a command to add an unmanaged shared component value on a NativeArray of entities. | | [AppendToBuffer](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/appendtobuffer.md) | Records a command to append a single element to the end of a dynamic buffer component. | | [AsParallelWriter](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/asparallelwriter.md) | An extension of EntityCommandBuffer that allows concurrent (deterministic) command buffer recording. | | [CreateEntity](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/createentity.md) | Records a command to create an entity with no components. | | [DestroyEntity](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/destroyentity.md) | Records a command to destroy a NativeArray of entities. | | [Dispose](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/dispose.md) | Deals with freeing and releasing unmanaged memory allocated by the entity command buffer. | | [Instantiate](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/instantiate.md) | Records a command to create an entity with specified entity prefab. | | [Playback](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/playback.md) | Play back all recorded operations against an entity manager. | | [RemoveComponent](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/removecomponent.md) | Records a command to remove one or more components from a NativeArray of entities. | | [ReplaceComponentForLinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/replacecomponentforlinkedentitygroup.md) | Records a command that replaces a component value for an entity's [LinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/linkedentitygroup.md). Entities in the [LinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/linkedentitygroup.md) that don't have the component will be skipped safely. | | [SetBuffer](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/setbuffer.md) | Records a command to set a dynamic buffer on an entity. | | [SetComponent](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/setcomponent.md) | Records a command to set a component value on an entity. | | [SetComponentEnabled](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/setcomponentenabled.md) | Records a command to enable or disable a [ComponentType](/engine/7000.0/script-reference/unity/entities/componenttype.md) on the specified [Entity](/engine/7000.0/script-reference/unity/entities/entity.md). This operation does not cause a structural change, or affect the value of the component. For the purposes of EntityQuery matching, an entity with a disabled component will behave as if it does not have that component. | | [SetComponentForLinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/setcomponentforlinkedentitygroup.md) | Records a command that sets a component for an entity's [LinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/linkedentitygroup.md) based on an [EntityQueryMask](/engine/7000.0/script-reference/unity/entities/entityquerymask.md). Entities in the [LinkedEntityGroup](/engine/7000.0/script-reference/unity/entities/linkedentitygroup.md) that don't match the mask will be skipped safely. | | [SetEnabled](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/setenabled.md) | Records a command to add or remove the [Disabled](/engine/7000.0/script-reference/unity/entities/disabled.md) component. By default EntityQuery does not include entities containing the Disabled component. Enabled entities are processed by systems, disabled entities are not. | | [SetName](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/setname.md) | Records a command to set a name of an entity if Debug Names is enabled. | | [SetSharedComponent](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/setsharedcomponent.md) | Records a command to set an unmanaged shared component value on a NativeArray of entities. | ## Structs | Struct | Description | | -------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------- | | [EntityCommandBuffer.ParallelWriter](/engine/7000.0/script-reference/unity/entities/entitycommandbuffer/parallelwriter.md) | Allows concurrent (deterministic) command buffer recording. |