RosDBCluster

This class is a base encapsulation around the ROS resource type ALIYUN::POLARDB::DBCluster, which is used to create a PolarDB cluster.

Initializers

import { RosDBCluster } from '@alicloud/ros-cdk-polardb'
new RosDBCluster(scope: Construct, id: string, props: RosDBClusterProps, enableResourcePropertyConstraint: boolean)

Name	Type	Description
scope	@alicloud/ros-cdk-core.Construct	- scope in which this resource is defined.
id	string	- scoped id of the resource.
props	RosDBClusterProps	- resource properties.
enableResourcePropertyConstraint	boolean	No description.

---

scope^Required

• Type: @alicloud/ros-cdk-core.Construct

scope in which this resource is defined.

---

id^Required

• Type: string

scoped id of the resource.

---

props^Required

• Type: RosDBClusterProps

resource properties.

---

enableResourcePropertyConstraint^Required

• Type: boolean

---

Methods

Name	Description
toString	Returns a string representation of this construct.
synthesize	Allows this construct to emit artifacts into the cloud assembly during synthesis.
overrideLogicalId	Overrides the auto-generated logical ID with a specific ID.
addCondition	No description.
addCount	No description.
addDeletionOverride	Syntactic sugar for addOverride(path, undefined).
addDependsOn	Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.
addDesc	No description.
addMetaData	No description.
addOverride	Adds an override to the synthesized ROS resource.
addPropertyDeletionOverride	Adds an override that deletes the value of a property from the resource definition.
addPropertyOverride	Adds an override to a resource property.
addRosDependency	No description.
applyRemovalPolicy	Sets the deletion policy of the resource based on the removal policy specified.
getAtt	Returns a token for an runtime attribute of this resource.

---

toString

public toString(): string

Returns a string representation of this construct.

synthesize

public synthesize(session: ISynthesisSession): void

Allows this construct to emit artifacts into the cloud assembly during synthesis.

This method is usually implemented by framework-level constructs such as Stack and Asset as they participate in synthesizing the cloud assembly.

session^Required

• Type: @alicloud/ros-cdk-core.ISynthesisSession

The synthesis session.

---

overrideLogicalId

public overrideLogicalId(newLogicalId: string): void

Overrides the auto-generated logical ID with a specific ID.

newLogicalId^Required

• Type: string

The new logical ID to use for this stack element.

---

addCondition

public addCondition(con: RosCondition): void

con^Required

• Type: @alicloud/ros-cdk-core.RosCondition

---

addCount

public addCount(count: number | IResolvable): void

count^Required

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

addDeletionOverride

public addDeletionOverride(path: string): void

Syntactic sugar for addOverride(path, undefined).

path^Required

• Type: string

The path of the value to delete.

---

addDependsOn

public addDependsOn(target: RosResource): void

Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.

This can be used for resources across stacks (or nested stack) boundaries and the dependency will automatically be transferred to the relevant scope.

target^Required

• Type: @alicloud/ros-cdk-core.RosResource

---

addDesc

public addDesc(desc: string): void

desc^Required

• Type: string

---

addMetaData

public addMetaData(key: string, value: any): void

key^Required

• Type: string

---

value^Required

• Type: any

---

addOverride

public addOverride(path: string, value: any): void

Adds an override to the synthesized ROS resource.

To add a property override, either use addPropertyOverride or prefix path with "Properties." (i.e. Properties.TopicName).

If the override is nested, separate each nested level using a dot (.) in the path parameter. If there is an array as part of the nesting, specify the index in the path.

For example,

addOverride('Properties.GlobalSecondaryIndexes.0.Projection.NonKeyAttributes', ['myattribute'])
addOverride('Properties.GlobalSecondaryIndexes.1.ProjectionType', 'INCLUDE')

would add the overrides

"Properties": {
   "GlobalSecondaryIndexes": [
     {
       "Projection": {
         "NonKeyAttributes": [ "myattribute" ]
         ...
       }
       ...
     },
     {
       "ProjectionType": "INCLUDE"
       ...
     },
   ]
   ...
}

path^Required

• Type: string

The path of the property, you can use dot notation to override values in complex types.

Any intermdediate keys will be created as needed.

---

value^Required

• Type: any

The value.

Could be primitive or complex.

---

addPropertyDeletionOverride

public addPropertyDeletionOverride(propertyPath: string): void

Adds an override that deletes the value of a property from the resource definition.

propertyPath^Required

• Type: string

The path to the property.

---

addPropertyOverride

public addPropertyOverride(propertyPath: string, value: any): void

Adds an override to a resource property.

Syntactic sugar for addOverride("Properties.<...>", value).

propertyPath^Required

• Type: string

The path of the property.

---

value^Required

• Type: any

The value.

---

addRosDependency

public addRosDependency(target: string): void

target^Required

• Type: string

---

applyRemovalPolicy

public applyRemovalPolicy(policy?: RemovalPolicy, options?: RemovalPolicyOptions): void

Sets the deletion policy of the resource based on the removal policy specified.

policy^Optional

• Type: @alicloud/ros-cdk-core.RemovalPolicy

---

options^Optional

• Type: @alicloud/ros-cdk-core.RemovalPolicyOptions

---

getAtt

public getAtt(attributeName: string): Reference

Returns a token for an runtime attribute of this resource.

Ideally, use generated attribute accessors (e.g. resource.arn), but this can be used for future compatibility in case there is no generated attribute.

attributeName^Required

• Type: string

The name of the attribute.

---

Static Functions

Name	Description
isConstruct	Return whether the given object is a Construct.
isRosElement	Returns true if a construct is a stack element (i.e. part of the synthesized template).
isRosResource	Check whether the given construct is a RosResource.

---

isConstruct

import { RosDBCluster } from '@alicloud/ros-cdk-polardb'
RosDBCluster.isConstruct(x: any)

Return whether the given object is a Construct.

x^Required

• Type: any

---

isRosElement

import { RosDBCluster } from '@alicloud/ros-cdk-polardb'
RosDBCluster.isRosElement(x: any)

Returns true if a construct is a stack element (i.e. part of the synthesized template).

Uses duck-typing instead of instanceof to allow stack elements from different versions of this library to be included in the same stack.

x^Required

• Type: any

---

isRosResource

import { RosDBCluster } from '@alicloud/ros-cdk-polardb'
RosDBCluster.isRosResource(construct: IConstruct)

Check whether the given construct is a RosResource.

construct^Required

• Type: @alicloud/ros-cdk-core.IConstruct

---

Properties

Name	Type	Description
node	@alicloud/ros-cdk-core.ConstructNode	The construct tree node associated with this construct.
creationStack	string[]	No description.
logicalId	string	The logical ID for this stack element.
stack	@alicloud/ros-cdk-core.Stack	The stack in which this element is defined.
ref	string	Return a string that will be resolved to a RosTemplate { Ref } for this element.
rosOptions	@alicloud/ros-cdk-core.IRosResourceOptions	Options for this resource, such as condition, update policy etc.
rosResourceType	string	ROS resource type.
attrClusterConnectionString	@alicloud/ros-cdk-core.IResolvable	No description.
attrClusterEndpointId	@alicloud/ros-cdk-core.IResolvable	No description.
attrColdStorageInstanceId	@alicloud/ros-cdk-core.IResolvable	No description.
attrCustomConnectionStrings	@alicloud/ros-cdk-core.IResolvable	No description.
attrCustomEndpointIds	@alicloud/ros-cdk-core.IResolvable	No description.
attrDbClusterDescription	@alicloud/ros-cdk-core.IResolvable	No description.
attrDbClusterId	@alicloud/ros-cdk-core.IResolvable	No description.
attrDbNodeIds	@alicloud/ros-cdk-core.IResolvable	No description.
attrOrderId	@alicloud/ros-cdk-core.IResolvable	No description.
attrPrimaryConnectionString	@alicloud/ros-cdk-core.IResolvable	No description.
attrPrimaryConnectionStrings	@alicloud/ros-cdk-core.IResolvable	No description.
attrPrimaryEndpointId	@alicloud/ros-cdk-core.IResolvable	No description.
attrPrimaryEndpointIds	@alicloud/ros-cdk-core.IResolvable	No description.
dbNodeClass	string | @alicloud/ros-cdk-core.IResolvable	No description.
dbType	string | @alicloud/ros-cdk-core.IResolvable	No description.
dbVersion	string | @alicloud/ros-cdk-core.IResolvable	No description.
enableResourcePropertyConstraint	boolean	No description.
payType	string | @alicloud/ros-cdk-core.IResolvable	No description.
allowShutDown	boolean | @alicloud/ros-cdk-core.IResolvable	No description.
architecture	string | @alicloud/ros-cdk-core.IResolvable	No description.
autoRenewPeriod	number | @alicloud/ros-cdk-core.IResolvable	No description.
backupRetentionPolicyOnClusterDeletion	string | @alicloud/ros-cdk-core.IResolvable	No description.
cloneDataPoint	string | @alicloud/ros-cdk-core.IResolvable	No description.
clusterNetworkType	string | @alicloud/ros-cdk-core.IResolvable	No description.
coldStorageOption	@alicloud/ros-cdk-core.IResolvable | ColdStorageOptionProperty	No description.
creationCategory	string | @alicloud/ros-cdk-core.IResolvable	No description.
creationOption	string | @alicloud/ros-cdk-core.IResolvable	No description.
dbClusterDescription	string | @alicloud/ros-cdk-core.IResolvable	No description.
dbClusterParameters	@alicloud/ros-cdk-core.IResolvable | DBClusterParametersProperty	No description.
dbMinorVersion	string | @alicloud/ros-cdk-core.IResolvable	No description.
dbNodeNum	number | @alicloud/ros-cdk-core.IResolvable	No description.
defaultTimeZone	string | @alicloud/ros-cdk-core.IResolvable	No description.
deletionProtection	boolean | @alicloud/ros-cdk-core.IResolvable	No description.
gdnId	string | @alicloud/ros-cdk-core.IResolvable	No description.
hotStandbyCluster	string | @alicloud/ros-cdk-core.IResolvable	No description.
loosePolarLogBin	string | @alicloud/ros-cdk-core.IResolvable	No description.
looseXEngine	string | @alicloud/ros-cdk-core.IResolvable	No description.
looseXEngineUseMemoryPct	number | @alicloud/ros-cdk-core.IResolvable	No description.
lowerCaseTableNames	number | @alicloud/ros-cdk-core.IResolvable	No description.
maintainTime	string | @alicloud/ros-cdk-core.IResolvable	No description.
parameterGroupId	string | @alicloud/ros-cdk-core.IResolvable	No description.
period	number | @alicloud/ros-cdk-core.IResolvable	No description.
periodUnit	string | @alicloud/ros-cdk-core.IResolvable	No description.
provisionedIops	number | @alicloud/ros-cdk-core.IResolvable	No description.
proxyClass	string | @alicloud/ros-cdk-core.IResolvable	No description.
proxyType	string | @alicloud/ros-cdk-core.IResolvable	No description.
renewalStatus	string | @alicloud/ros-cdk-core.IResolvable	No description.
resourceGroupId	string | @alicloud/ros-cdk-core.IResolvable	No description.
restartMasterNode	boolean | @alicloud/ros-cdk-core.IResolvable	No description.
scaleMax	number | @alicloud/ros-cdk-core.IResolvable	No description.
scaleMin	number | @alicloud/ros-cdk-core.IResolvable	No description.
scaleRoNumMax	number | @alicloud/ros-cdk-core.IResolvable	No description.
scaleRoNumMin	number | @alicloud/ros-cdk-core.IResolvable	No description.
securityGroupIds	@alicloud/ros-cdk-core.IResolvable | string | @alicloud/ros-cdk-core.IResolvable[]	No description.
securityIpList	string | @alicloud/ros-cdk-core.IResolvable	No description.
serverlessType	string | @alicloud/ros-cdk-core.IResolvable	No description.
sourceResourceId	string | @alicloud/ros-cdk-core.IResolvable	No description.
standbyAz	string | @alicloud/ros-cdk-core.IResolvable	No description.
storageAutoScale	string | @alicloud/ros-cdk-core.IResolvable	No description.
storagePayType	string | @alicloud/ros-cdk-core.IResolvable	No description.
storageSpace	number | @alicloud/ros-cdk-core.IResolvable	No description.
storageType	string | @alicloud/ros-cdk-core.IResolvable	No description.
storageUpperBound	number | @alicloud/ros-cdk-core.IResolvable	No description.
strictConsistency	string | @alicloud/ros-cdk-core.IResolvable	No description.
tags	TagsProperty[]	No description.
tdeStatus	boolean | @alicloud/ros-cdk-core.IResolvable	No description.
vpcId	string | @alicloud/ros-cdk-core.IResolvable	No description.
vSwitchId	string | @alicloud/ros-cdk-core.IResolvable	No description.
zoneId	string | @alicloud/ros-cdk-core.IResolvable	No description.

---

node^Required

public readonly node: ConstructNode;

• Type: @alicloud/ros-cdk-core.ConstructNode

The construct tree node associated with this construct.

---

creationStack^Required

public readonly creationStack: string[];

• Type: string[]

---

logicalId^Required

public readonly logicalId: string;

• Type: string

The logical ID for this stack element.

The logical ID of the element is calculated from the path of the resource node in the construct tree.

To override this value, use overrideLogicalId(newLogicalId).

---

stack^Required

public readonly stack: Stack;

• Type: @alicloud/ros-cdk-core.Stack

The stack in which this element is defined.

RosElements must be defined within a stack scope (directly or indirectly).

---

ref^Required

public readonly ref: string;

• Type: string

Return a string that will be resolved to a RosTemplate { Ref } for this element.

If, by any chance, the intrinsic reference of a resource is not a string, you could coerce it to an IResolvable through Lazy.any({ produce: resource.ref }).

---

rosOptions^Required

public readonly rosOptions: IRosResourceOptions;

• Type: @alicloud/ros-cdk-core.IRosResourceOptions

Options for this resource, such as condition, update policy etc.

---

rosResourceType^Required

public readonly rosResourceType: string;

• Type: string

ROS resource type.

---

attrClusterConnectionString^Required

public readonly attrClusterConnectionString: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrClusterEndpointId^Required

public readonly attrClusterEndpointId: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrColdStorageInstanceId^Required

public readonly attrColdStorageInstanceId: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrCustomConnectionStrings^Required

public readonly attrCustomConnectionStrings: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrCustomEndpointIds^Required

public readonly attrCustomEndpointIds: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrDbClusterDescription^Required

public readonly attrDbClusterDescription: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrDbClusterId^Required

public readonly attrDbClusterId: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrDbNodeIds^Required

public readonly attrDbNodeIds: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrOrderId^Required

public readonly attrOrderId: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrPrimaryConnectionString^Required

public readonly attrPrimaryConnectionString: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrPrimaryConnectionStrings^Required

public readonly attrPrimaryConnectionStrings: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrPrimaryEndpointId^Required

public readonly attrPrimaryEndpointId: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

attrPrimaryEndpointIds^Required

public readonly attrPrimaryEndpointIds: IResolvable;

• Type: @alicloud/ros-cdk-core.IResolvable

---

dbNodeClass^Required

public readonly dbNodeClass: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

dbType^Required

public readonly dbType: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

dbVersion^Required

public readonly dbVersion: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

enableResourcePropertyConstraint^Required

public readonly enableResourcePropertyConstraint: boolean;

• Type: boolean

---

payType^Required

public readonly payType: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

allowShutDown^Optional

public readonly allowShutDown: boolean | IResolvable;

• Type: boolean | @alicloud/ros-cdk-core.IResolvable

---

architecture^Optional

public readonly architecture: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

autoRenewPeriod^Optional

public readonly autoRenewPeriod: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

backupRetentionPolicyOnClusterDeletion^Optional

public readonly backupRetentionPolicyOnClusterDeletion: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

cloneDataPoint^Optional

public readonly cloneDataPoint: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

clusterNetworkType^Optional

public readonly clusterNetworkType: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

coldStorageOption^Optional

public readonly coldStorageOption: IResolvable | ColdStorageOptionProperty;

• Type: @alicloud/ros-cdk-core.IResolvable | ColdStorageOptionProperty

---

creationCategory^Optional

public readonly creationCategory: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

creationOption^Optional

public readonly creationOption: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

dbClusterDescription^Optional

public readonly dbClusterDescription: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

dbClusterParameters^Optional

public readonly dbClusterParameters: IResolvable | DBClusterParametersProperty;

• Type: @alicloud/ros-cdk-core.IResolvable | DBClusterParametersProperty

---

dbMinorVersion^Optional

public readonly dbMinorVersion: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

dbNodeNum^Optional

public readonly dbNodeNum: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

defaultTimeZone^Optional

public readonly defaultTimeZone: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

deletionProtection^Optional

public readonly deletionProtection: boolean | IResolvable;

• Type: boolean | @alicloud/ros-cdk-core.IResolvable

---

gdnId^Optional

public readonly gdnId: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

hotStandbyCluster^Optional

public readonly hotStandbyCluster: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

loosePolarLogBin^Optional

public readonly loosePolarLogBin: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

looseXEngine^Optional

public readonly looseXEngine: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

looseXEngineUseMemoryPct^Optional

public readonly looseXEngineUseMemoryPct: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

lowerCaseTableNames^Optional

public readonly lowerCaseTableNames: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

maintainTime^Optional

public readonly maintainTime: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

parameterGroupId^Optional

public readonly parameterGroupId: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

period^Optional

public readonly period: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

periodUnit^Optional

public readonly periodUnit: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

provisionedIops^Optional

public readonly provisionedIops: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

proxyClass^Optional

public readonly proxyClass: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

proxyType^Optional

public readonly proxyType: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

renewalStatus^Optional

public readonly renewalStatus: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

resourceGroupId^Optional

public readonly resourceGroupId: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

restartMasterNode^Optional

public readonly restartMasterNode: boolean | IResolvable;

• Type: boolean | @alicloud/ros-cdk-core.IResolvable

---

scaleMax^Optional

public readonly scaleMax: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

scaleMin^Optional

public readonly scaleMin: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

scaleRoNumMax^Optional

public readonly scaleRoNumMax: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

scaleRoNumMin^Optional

public readonly scaleRoNumMin: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

securityGroupIds^Optional

public readonly securityGroupIds: IResolvable | string | IResolvable[];

• Type: @alicloud/ros-cdk-core.IResolvable | string | @alicloud/ros-cdk-core.IResolvable[]

---

securityIpList^Optional

public readonly securityIpList: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

serverlessType^Optional

public readonly serverlessType: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

sourceResourceId^Optional

public readonly sourceResourceId: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

standbyAz^Optional

public readonly standbyAz: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

storageAutoScale^Optional

public readonly storageAutoScale: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

storagePayType^Optional

public readonly storagePayType: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

storageSpace^Optional

public readonly storageSpace: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

storageType^Optional

public readonly storageType: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

storageUpperBound^Optional

public readonly storageUpperBound: number | IResolvable;

• Type: number | @alicloud/ros-cdk-core.IResolvable

---

strictConsistency^Optional

public readonly strictConsistency: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

tags^Optional

public readonly tags: TagsProperty[];

• Type: TagsProperty[]

---

tdeStatus^Optional

public readonly tdeStatus: boolean | IResolvable;

• Type: boolean | @alicloud/ros-cdk-core.IResolvable

---

vpcId^Optional

public readonly vpcId: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

vSwitchId^Optional

public readonly vSwitchId: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

zoneId^Optional

public readonly zoneId: string | IResolvable;

• Type: string | @alicloud/ros-cdk-core.IResolvable

---

Constants

Name	Type	Description
ROS_RESOURCE_TYPE_NAME	string	The resource type name for this resource class.

---

ROS_RESOURCE_TYPE_NAME^Required

public readonly ROS_RESOURCE_TYPE_NAME: string;

• Type: string

The resource type name for this resource class.

---