Amazonka.CloudWatchEvents.Types.PlacementConstraint

Documentation

data PlacementConstraint

An object representing a constraint on task placement. To learn more, see Task Placement Constraints in the Amazon Elastic Container Service Developer Guide.

See: newPlacementConstraint smart constructor.

Constructors

PlacementConstraint'

Fields

• expression :: Maybe Text

  A cluster query language expression to apply to the constraint. You cannot specify an expression if the constraint type is distinctInstance. To learn more, see Cluster Query Language in the Amazon Elastic Container Service Developer Guide.

• type' :: Maybe PlacementConstraintType

  The type of constraint. Use distinctInstance to ensure that each task in a particular group is running on a different container instance. Use memberOf to restrict the selection to a group of valid candidates.

Instances

FromJSON PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

Methods

parseJSON :: Value -> Parser PlacementConstraint

parseJSONList :: Value -> Parser [PlacementConstraint]

ToJSON PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

Methods

toJSON :: PlacementConstraint -> Value

toEncoding :: PlacementConstraint -> Encoding

toJSONList :: [PlacementConstraint] -> Value

toEncodingList :: [PlacementConstraint] -> Encoding

Generic PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

Associated Types

type Rep PlacementConstraint :: Type -> Type

Methods

from :: PlacementConstraint -> Rep PlacementConstraint x

to :: Rep PlacementConstraint x -> PlacementConstraint

Read PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

Methods

readsPrec :: Int -> ReadS PlacementConstraint

readList :: ReadS [PlacementConstraint]

readPrec :: ReadPrec PlacementConstraint

readListPrec :: ReadPrec [PlacementConstraint]

Show PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

Methods

showsPrec :: Int -> PlacementConstraint -> ShowS

show :: PlacementConstraint -> String

showList :: [PlacementConstraint] -> ShowS

NFData PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

Methods

rnf :: PlacementConstraint -> ()

Eq PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

Methods

(==) :: PlacementConstraint -> PlacementConstraint -> Bool

(/=) :: PlacementConstraint -> PlacementConstraint -> Bool

Hashable PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

Methods

hashWithSalt :: Int -> PlacementConstraint -> Int

hash :: PlacementConstraint -> Int

type Rep PlacementConstraint

Defined in Amazonka.CloudWatchEvents.Types.PlacementConstraint

type Rep PlacementConstraint = D1 ('MetaData "PlacementConstraint" "Amazonka.CloudWatchEvents.Types.PlacementConstraint" "amazonka-cloudwatch-events-2.0-GJzRBos1CnlE3BT39axMc5" 'False) (C1 ('MetaCons "PlacementConstraint'" 'PrefixI 'True) (S1 ('MetaSel ('Just "expression") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe Text)) :*: S1 ('MetaSel ('Just "type'") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe PlacementConstraintType))))

newPlacementConstraint :: PlacementConstraint

Create a value of PlacementConstraint with all optional fields omitted.

Use generic-lens or optics to modify other optional fields.

The following record fields are available, with the corresponding lenses provided for backwards compatibility:

$sel:expression:PlacementConstraint', placementConstraint_expression - A cluster query language expression to apply to the constraint. You cannot specify an expression if the constraint type is distinctInstance. To learn more, see Cluster Query Language in the Amazon Elastic Container Service Developer Guide.

$sel:type':PlacementConstraint', placementConstraint_type - The type of constraint. Use distinctInstance to ensure that each task in a particular group is running on a different container instance. Use memberOf to restrict the selection to a group of valid candidates.

placementConstraint_expression :: Lens' PlacementConstraint (Maybe Text)

A cluster query language expression to apply to the constraint. You cannot specify an expression if the constraint type is distinctInstance. To learn more, see Cluster Query Language in the Amazon Elastic Container Service Developer Guide.

placementConstraint_type :: Lens' PlacementConstraint (Maybe PlacementConstraintType)

The type of constraint. Use distinctInstance to ensure that each task in a particular group is running on a different container instance. Use memberOf to restrict the selection to a group of valid candidates.