RosInstance

This class is a base encapsulation around the ROS resource type ALIYUN::ENS::Instance, which is used to create an Edge Node Service (ENS) instance.

Initializers

import com.aliyun.ros.cdk.ens.RosInstance;
RosInstance.Builder.create(Construct scope, java.lang.String id, java.lang.Boolean enableResourcePropertyConstraint)
    .dataDiskSize(java.lang.Number)
    .dataDiskSize(IResolvable)
    .ensRegionId(java.lang.String)
    .ensRegionId(IResolvable)
    .imageId(java.lang.String)
    .imageId(IResolvable)
    .instanceType(java.lang.String)
    .instanceType(IResolvable)
    .period(java.lang.Number)
    .period(IResolvable)
    .quantity(java.lang.Number)
    .quantity(IResolvable)
    .systemDiskSize(java.lang.Number)
    .systemDiskSize(IResolvable)
//  .autoRenew(java.lang.String)
//  .autoRenew(IResolvable)
//  .autoRenewPeriod(java.lang.Number)
//  .autoRenewPeriod(IResolvable)
//  .hostName(java.lang.String)
//  .hostName(IResolvable)
//  .instanceName(java.lang.String)
//  .instanceName(IResolvable)
//  .internetChargeType(java.lang.String)
//  .internetChargeType(IResolvable)
//  .ipType(java.lang.String)
//  .ipType(IResolvable)
//  .keyPairName(java.lang.String)
//  .keyPairName(IResolvable)
//  .password(java.lang.String)
//  .password(IResolvable)
//  .paymentType(java.lang.String)
//  .paymentType(IResolvable)
//  .privateIpAddress(java.lang.String)
//  .privateIpAddress(IResolvable)
//  .uniqueSuffix(java.lang.Boolean)
//  .uniqueSuffix(IResolvable)
//  .userData(java.lang.String)
//  .userData(IResolvable)
//  .vSwitchId(java.lang.String)
//  .vSwitchId(IResolvable)
    .build();

Name	Type	Description
scope	com.aliyun.ros.cdk.core.Construct	- scope in which this resource is defined.
id	java.lang.String	- scoped id of the resource.
enableResourcePropertyConstraint	java.lang.Boolean	No description.
dataDiskSize	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
ensRegionId	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
imageId	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
instanceType	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
period	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
quantity	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
systemDiskSize	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
autoRenew	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
autoRenewPeriod	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
hostName	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
instanceName	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
internetChargeType	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
ipType	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
keyPairName	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
password	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
paymentType	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
privateIpAddress	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
uniqueSuffix	java.lang.Boolean OR com.aliyun.ros.cdk.core.IResolvable	No description.
userData	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
vSwitchId	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.

---

scope^Required

• Type: com.aliyun.ros.cdk.core.Construct

scope in which this resource is defined.

---

id^Required

• Type: java.lang.String

scoped id of the resource.

---

enableResourcePropertyConstraint^Required

• Type: java.lang.Boolean

---

dataDiskSize^Required

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

ensRegionId^Required

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

imageId^Required

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

instanceType^Required

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

period^Required

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

quantity^Required

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

systemDiskSize^Required

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

autoRenew^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

autoRenewPeriod^Optional

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

hostName^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

instanceName^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

internetChargeType^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

ipType^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

keyPairName^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

password^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

paymentType^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

privateIpAddress^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

uniqueSuffix^Optional

• Type: java.lang.Boolean OR com.aliyun.ros.cdk.core.IResolvable

---

userData^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

vSwitchId^Optional

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

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 java.lang.String toString()

Returns a string representation of this construct.

synthesize

public void synthesize(ISynthesisSession session)

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: com.aliyun.ros.cdk.core.ISynthesisSession

The synthesis session.

---

overrideLogicalId

public void overrideLogicalId(java.lang.String newLogicalId)

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

newLogicalId^Required

• Type: java.lang.String

The new logical ID to use for this stack element.

---

addCondition

public void addCondition(RosCondition con)

con^Required

• Type: com.aliyun.ros.cdk.core.RosCondition

---

addCount

public void addCount(java.lang.Number OR IResolvable count)

count^Required

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

addDeletionOverride

public void addDeletionOverride(java.lang.String path)

Syntactic sugar for addOverride(path, undefined).

path^Required

• Type: java.lang.String

The path of the value to delete.

---

addDependsOn

public void addDependsOn(RosResource target)

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: com.aliyun.ros.cdk.core.RosResource

---

addDesc

public void addDesc(java.lang.String desc)

desc^Required

• Type: java.lang.String

---

addMetaData

public void addMetaData(java.lang.String key, java.lang.Object value)

key^Required

• Type: java.lang.String

---

value^Required

• Type: java.lang.Object

---

addOverride

public void addOverride(java.lang.String path, java.lang.Object value)

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: java.lang.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: java.lang.Object

The value.

Could be primitive or complex.

---

addPropertyDeletionOverride

public void addPropertyDeletionOverride(java.lang.String propertyPath)

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

propertyPath^Required

• Type: java.lang.String

The path to the property.

---

addPropertyOverride

public void addPropertyOverride(java.lang.String propertyPath, java.lang.Object value)

Adds an override to a resource property.

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

propertyPath^Required

• Type: java.lang.String

The path of the property.

---

value^Required

• Type: java.lang.Object

The value.

---

addRosDependency

public void addRosDependency(java.lang.String target)

target^Required

• Type: java.lang.String

---

applyRemovalPolicy

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

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

policy^Optional

• Type: com.aliyun.ros.cdk.core.RemovalPolicy

---

options^Optional

• Type: com.aliyun.ros.cdk.core.RemovalPolicyOptions

---

getAtt

public Reference getAtt(java.lang.String attributeName)

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: java.lang.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 com.aliyun.ros.cdk.ens.RosInstance;
RosInstance.isConstruct(java.lang.Object x)

Return whether the given object is a Construct.

x^Required

• Type: java.lang.Object

---

isRosElement

import com.aliyun.ros.cdk.ens.RosInstance;
RosInstance.isRosElement(java.lang.Object x)

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: java.lang.Object

---

isRosResource

import com.aliyun.ros.cdk.ens.RosInstance;
RosInstance.isRosResource(IConstruct construct)

Check whether the given construct is a RosResource.

construct^Required

• Type: com.aliyun.ros.cdk.core.IConstruct

---

Properties

Name	Type	Description
node	com.aliyun.ros.cdk.core.ConstructNode	The construct tree node associated with this construct.
creationStack	java.util.List	No description.
logicalId	java.lang.String	The logical ID for this stack element.
stack	com.aliyun.ros.cdk.core.Stack	The stack in which this element is defined.
ref	java.lang.String	Return a string that will be resolved to a RosTemplate { Ref } for this element.
rosOptions	com.aliyun.ros.cdk.core.IRosResourceOptions	Options for this resource, such as condition, update policy etc.
rosResourceType	java.lang.String	ROS resource type.
attrAutoRenew	com.aliyun.ros.cdk.core.IResolvable	No description.
attrAutoRenewPeriod	com.aliyun.ros.cdk.core.IResolvable	No description.
attrDataDiskSize	com.aliyun.ros.cdk.core.IResolvable	No description.
attrEnsRegionId	com.aliyun.ros.cdk.core.IResolvable	No description.
attrHostName	com.aliyun.ros.cdk.core.IResolvable	No description.
attrImageId	com.aliyun.ros.cdk.core.IResolvable	No description.
attrInstanceId	com.aliyun.ros.cdk.core.IResolvable	No description.
attrInstanceName	com.aliyun.ros.cdk.core.IResolvable	No description.
attrInstanceType	com.aliyun.ros.cdk.core.IResolvable	No description.
attrInternetChargeType	com.aliyun.ros.cdk.core.IResolvable	No description.
attrIpType	com.aliyun.ros.cdk.core.IResolvable	No description.
attrKeyPairName	com.aliyun.ros.cdk.core.IResolvable	No description.
attrPaymentType	com.aliyun.ros.cdk.core.IResolvable	No description.
attrPeriod	com.aliyun.ros.cdk.core.IResolvable	No description.
attrPrivateIpAddress	com.aliyun.ros.cdk.core.IResolvable	No description.
attrPrivateIps	com.aliyun.ros.cdk.core.IResolvable	No description.
attrPublicIps	com.aliyun.ros.cdk.core.IResolvable	No description.
attrQuantity	com.aliyun.ros.cdk.core.IResolvable	No description.
attrSystemDiskSize	com.aliyun.ros.cdk.core.IResolvable	No description.
attrUniqueSuffix	com.aliyun.ros.cdk.core.IResolvable	No description.
attrUserData	com.aliyun.ros.cdk.core.IResolvable	No description.
attrVSwitchId	com.aliyun.ros.cdk.core.IResolvable	No description.
dataDiskSize	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
enableResourcePropertyConstraint	java.lang.Boolean	No description.
ensRegionId	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
imageId	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
instanceType	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
period	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
quantity	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
systemDiskSize	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
autoRenew	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
autoRenewPeriod	java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable	No description.
hostName	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
instanceName	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
internetChargeType	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
ipType	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
keyPairName	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
password	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
paymentType	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
privateIpAddress	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
uniqueSuffix	java.lang.Boolean OR com.aliyun.ros.cdk.core.IResolvable	No description.
userData	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.
vSwitchId	java.lang.String OR com.aliyun.ros.cdk.core.IResolvable	No description.

---

node^Required

public ConstructNode getNode();

• Type: com.aliyun.ros.cdk.core.ConstructNode

The construct tree node associated with this construct.

---

creationStack^Required

public java.util.List<java.lang.String> getCreationStack();

• Type: java.util.List

---

logicalId^Required

public java.lang.String getLogicalId();

• Type: java.lang.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 Stack getStack();

• Type: com.aliyun.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 java.lang.String getRef();

• Type: java.lang.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 IRosResourceOptions getRosOptions();

• Type: com.aliyun.ros.cdk.core.IRosResourceOptions

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

---

rosResourceType^Required

public java.lang.String getRosResourceType();

• Type: java.lang.String

ROS resource type.

---

attrAutoRenew^Required

public IResolvable getAttrAutoRenew();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrAutoRenewPeriod^Required

public IResolvable getAttrAutoRenewPeriod();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrDataDiskSize^Required

public IResolvable getAttrDataDiskSize();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrEnsRegionId^Required

public IResolvable getAttrEnsRegionId();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrHostName^Required

public IResolvable getAttrHostName();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrImageId^Required

public IResolvable getAttrImageId();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrInstanceId^Required

public IResolvable getAttrInstanceId();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrInstanceName^Required

public IResolvable getAttrInstanceName();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrInstanceType^Required

public IResolvable getAttrInstanceType();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrInternetChargeType^Required

public IResolvable getAttrInternetChargeType();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrIpType^Required

public IResolvable getAttrIpType();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrKeyPairName^Required

public IResolvable getAttrKeyPairName();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrPaymentType^Required

public IResolvable getAttrPaymentType();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrPeriod^Required

public IResolvable getAttrPeriod();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrPrivateIpAddress^Required

public IResolvable getAttrPrivateIpAddress();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrPrivateIps^Required

public IResolvable getAttrPrivateIps();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrPublicIps^Required

public IResolvable getAttrPublicIps();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrQuantity^Required

public IResolvable getAttrQuantity();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrSystemDiskSize^Required

public IResolvable getAttrSystemDiskSize();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrUniqueSuffix^Required

public IResolvable getAttrUniqueSuffix();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrUserData^Required

public IResolvable getAttrUserData();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

attrVSwitchId^Required

public IResolvable getAttrVSwitchId();

• Type: com.aliyun.ros.cdk.core.IResolvable

---

dataDiskSize^Required

public java.lang.Object getDataDiskSize();

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

enableResourcePropertyConstraint^Required

public java.lang.Boolean getEnableResourcePropertyConstraint();

• Type: java.lang.Boolean

---

ensRegionId^Required

public java.lang.Object getEnsRegionId();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

imageId^Required

public java.lang.Object getImageId();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

instanceType^Required

public java.lang.Object getInstanceType();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

period^Required

public java.lang.Object getPeriod();

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

quantity^Required

public java.lang.Object getQuantity();

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

systemDiskSize^Required

public java.lang.Object getSystemDiskSize();

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

autoRenew^Optional

public java.lang.Object getAutoRenew();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

autoRenewPeriod^Optional

public java.lang.Object getAutoRenewPeriod();

• Type: java.lang.Number OR com.aliyun.ros.cdk.core.IResolvable

---

hostName^Optional

public java.lang.Object getHostName();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

instanceName^Optional

public java.lang.Object getInstanceName();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

internetChargeType^Optional

public java.lang.Object getInternetChargeType();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

ipType^Optional

public java.lang.Object getIpType();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

keyPairName^Optional

public java.lang.Object getKeyPairName();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

password^Optional

public java.lang.Object getPassword();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

paymentType^Optional

public java.lang.Object getPaymentType();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

privateIpAddress^Optional

public java.lang.Object getPrivateIpAddress();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

uniqueSuffix^Optional

public java.lang.Object getUniqueSuffix();

• Type: java.lang.Boolean OR com.aliyun.ros.cdk.core.IResolvable

---

userData^Optional

public java.lang.Object getUserData();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

vSwitchId^Optional

public java.lang.Object getVSwitchId();

• Type: java.lang.String OR com.aliyun.ros.cdk.core.IResolvable

---

Constants

Name	Type	Description
ROS_RESOURCE_TYPE_NAME	java.lang.String	The resource type name for this resource class.

---

ROS_RESOURCE_TYPE_NAME^Required

public java.lang.String getRosResourceTypeName();

• Type: java.lang.String

The resource type name for this resource class.

---