software.amazon.awscdk.services.lambda

Class SingletonFunction

java.lang.Object

software.constructs.Construct

software.amazon.awscdk.core.Construct

software.amazon.awscdk.core.Resource

software.amazon.awscdk.services.lambda.FunctionBase

software.amazon.awscdk.services.lambda.SingletonFunction

All Implemented Interfaces:

IConstruct, IDependable, IResource, IClientVpnConnectionHandler, IConnectable, IGrantable, IFunction

@Generated(value="jsii-pacmak/1.74.0 (build 6d08790)",
           date="2023-03-22T19:35:44.227Z")
public class SingletonFunction
extends FunctionBase

A Lambda that will only ever be added to a stack once.

This construct is a way to guarantee that the lambda function will be guaranteed to be part of the stack, once and only once, irrespective of how many times the construct is declared to be part of the stack. This is guaranteed as long as the uuid property and the optional lambdaPurpose property stay the same whenever they're declared into the stack.

Example:

 // The code below shows an example of how to instantiate this type.
 // The values are placeholders you should change.
 import software.amazon.awscdk.services.codeguruprofiler.*;
 import software.amazon.awscdk.services.ec2.*;
 import software.amazon.awscdk.services.iam.*;
 import software.amazon.awscdk.services.kms.*;
 import software.amazon.awscdk.services.lambda.*;
 import software.amazon.awscdk.services.logs.*;
 import software.amazon.awscdk.services.sns.*;
 import software.amazon.awscdk.services.sqs.*;
 import software.amazon.awscdk.core.*;
 Architecture architecture;
 Code code;
 CodeSigningConfig codeSigningConfig;
 IDestination destination;
 IEventSource eventSource;
 FileSystem fileSystem;
 Key key;
 LambdaInsightsVersion lambdaInsightsVersion;
 LayerVersion layerVersion;
 PolicyStatement policyStatement;
 ProfilingGroup profilingGroup;
 Queue queue;
 Role role;
 Runtime runtime;
 SecurityGroup securityGroup;
 Size size;
 Subnet subnet;
 SubnetFilter subnetFilter;
 Topic topic;
 Vpc vpc;
 SingletonFunction singletonFunction = SingletonFunction.Builder.create(this, "MySingletonFunction")
         .code(code)
         .handler("handler")
         .runtime(runtime)
         .uuid("uuid")
         // the properties below are optional
         .allowAllOutbound(false)
         .allowPublicSubnet(false)
         .architecture(architecture)
         .architectures(List.of(architecture))
         .codeSigningConfig(codeSigningConfig)
         .currentVersionOptions(VersionOptions.builder()
                 .codeSha256("codeSha256")
                 .description("description")
                 .maxEventAge(Duration.minutes(30))
                 .onFailure(destination)
                 .onSuccess(destination)
                 .provisionedConcurrentExecutions(123)
                 .removalPolicy(RemovalPolicy.DESTROY)
                 .retryAttempts(123)
                 .build())
         .deadLetterQueue(queue)
         .deadLetterQueueEnabled(false)
         .deadLetterTopic(topic)
         .description("description")
         .environment(Map.of(
                 "environmentKey", "environment"))
         .environmentEncryption(key)
         .ephemeralStorageSize(size)
         .events(List.of(eventSource))
         .filesystem(fileSystem)
         .functionName("functionName")
         .initialPolicy(List.of(policyStatement))
         .insightsVersion(lambdaInsightsVersion)
         .lambdaPurpose("lambdaPurpose")
         .layers(List.of(layerVersion))
         .logRetention(RetentionDays.ONE_DAY)
         .logRetentionRetryOptions(LogRetentionRetryOptions.builder()
                 .base(Duration.minutes(30))
                 .maxRetries(123)
                 .build())
         .logRetentionRole(role)
         .maxEventAge(Duration.minutes(30))
         .memorySize(123)
         .onFailure(destination)
         .onSuccess(destination)
         .profiling(false)
         .profilingGroup(profilingGroup)
         .reservedConcurrentExecutions(123)
         .retryAttempts(123)
         .role(role)
         .securityGroup(securityGroup)
         .securityGroups(List.of(securityGroup))
         .timeout(Duration.minutes(30))
         .tracing(Tracing.ACTIVE)
         .vpc(vpc)
         .vpcSubnets(SubnetSelection.builder()
                 .availabilityZones(List.of("availabilityZones"))
                 .onePerAz(false)
                 .subnetFilters(List.of(subnetFilter))
                 .subnetGroupName("subnetGroupName")
                 .subnetName("subnetName")
                 .subnets(List.of(subnet))
                 .subnetType(SubnetType.ISOLATED)
                 .build())
         .build();
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SingletonFunction.Builder A fluent builder for SingletonFunction.

Nested classes/interfaces inherited from interface software.amazon.awscdk.services.lambda.IFunction

IFunction.Jsii$Default

Nested classes/interfaces inherited from interface software.amazon.awscdk.services.ec2.IClientVpnConnectionHandler

IClientVpnConnectionHandler.Jsii$Default

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SingletonFunction(software.amazon.jsii.JsiiObject.InitializationMode initializationMode)
protected	SingletonFunction(software.amazon.jsii.JsiiObjectRef objRef)
	SingletonFunction(software.constructs.Construct scope, java.lang.String id, SingletonFunctionProps props)

Method Summary

Modifier and Type	Method and Description
void	addDependency(IDependable... up) Using node.addDependency() does not work on this method as the underlying lambda function is modeled as a singleton across the stack.
Function	addEnvironment(java.lang.String key, java.lang.String value) Adds an environment variable to this Lambda function.
Function	addEnvironment(java.lang.String key, java.lang.String value, EnvironmentOptions options) Adds an environment variable to this Lambda function.
void	addLayers(ILayerVersion... layers) Adds one or more Lambda Layers to this Lambda function.
void	addPermission(java.lang.String name, Permission permission) Adds a permission to the Lambda resource policy.
void	dependOn(IConstruct down) The SingletonFunction construct cannot be added as a dependency of another construct using node.addDependency().
Architecture	getArchitecture() The architecture of this Lambda Function.
protected java.lang.Boolean	getCanCreatePermissions() Whether the addPermission() call adds any permissions.
Connections	getConnections() Access the Connections object.
Version	getCurrentVersion() Returns a `lambda.Version` which represents the current version of this singleton Lambda function.
java.lang.String	getFunctionArn() The ARN fo the function.
java.lang.String	getFunctionName() The name of the function.
IPrincipal	getGrantPrincipal() The principal this Lambda Function is running as.
java.lang.Boolean	getIsBoundToVpc() Whether or not this Lambda function was bound to a VPC.
ILogGroup	getLogGroup() The LogGroup where the Lambda function's logs are made available.
ConstructNode	getPermissionsNode() The construct node where permissions are attached.
java.util.List<java.lang.String>	getResourceArnsForGrantInvoke() The ARN(s) to put into the resource field of the generated IAM policy for grantInvoke().
IRole	getRole() The IAM role associated with this function.
Runtime	getRuntime() The runtime environment for the Lambda function.

Methods inherited from class software.amazon.awscdk.services.lambda.FunctionBase

addEventSource, addEventSourceMapping, addFunctionUrl, addFunctionUrl, addToRolePolicy, configureAsyncInvoke, considerWarningOnInvokeFunctionPermissions, getLatestVersion, grantInvoke, grantInvokeUrl, metric, metric, metricDuration, metricDuration, metricErrors, metricErrors, metricInvocations, metricInvocations, metricThrottles, metricThrottles, warnInvokeFunctionPermissions

Methods inherited from class software.amazon.awscdk.core.Resource

applyRemovalPolicy, generatePhysicalName, getEnv, getPhysicalName, getResourceArnAttribute, getResourceNameAttribute, getStack, isResource

Methods inherited from class software.amazon.awscdk.core.Construct

getNode, isConstruct, onPrepare, onSynthesize, onValidate, prepare, synthesize, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface software.amazon.awscdk.core.IResource

applyRemovalPolicy, getEnv, getStack

Methods inherited from interface software.amazon.awscdk.core.IConstruct

getNode

Constructor Detail

SingletonFunction

protected SingletonFunction(software.amazon.jsii.JsiiObjectRef objRef)

SingletonFunction

protected SingletonFunction(software.amazon.jsii.JsiiObject.InitializationMode initializationMode)

SingletonFunction

public SingletonFunction(software.constructs.Construct scope,
                         java.lang.String id,
                         SingletonFunctionProps props)

Parameters:

scope - This parameter is required.

id - This parameter is required.

props - This parameter is required.

Method Detail

addDependency

public void addDependency(IDependable... up)

Using node.addDependency() does not work on this method as the underlying lambda function is modeled as a singleton across the stack. Use this method instead to declare dependencies.

Parameters:

up - This parameter is required.

addEnvironment

public Function addEnvironment(java.lang.String key,
                               java.lang.String value,
                               EnvironmentOptions options)

Adds an environment variable to this Lambda function.

If this is a ref to a Lambda function, this operation results in a no-op.

Parameters:

key - The environment variable key. This parameter is required.

value - The environment variable's value. This parameter is required.

options - Environment variable options.

addEnvironment

public Function addEnvironment(java.lang.String key,
                               java.lang.String value)

Adds an environment variable to this Lambda function.

If this is a ref to a Lambda function, this operation results in a no-op.

Parameters:

key - The environment variable key. This parameter is required.

value - The environment variable's value. This parameter is required.

addLayers

public void addLayers(ILayerVersion... layers)

Adds one or more Lambda Layers to this Lambda function.

Parameters:

layers - the layers to be added. This parameter is required.

addPermission

public void addPermission(java.lang.String name,
                          Permission permission)

Adds a permission to the Lambda resource policy.

Specified by:

addPermission in interface IFunction

Overrides:

addPermission in class FunctionBase

Parameters:

name - This parameter is required.

permission - This parameter is required.

See Also:

Permission for details.

dependOn

public void dependOn(IConstruct down)

The SingletonFunction construct cannot be added as a dependency of another construct using node.addDependency(). Use this method instead to declare this as a dependency of another construct.

Parameters:

down - This parameter is required.

getArchitecture

public Architecture getArchitecture()

The architecture of this Lambda Function.

Specified by:

getArchitecture in interface IFunction

Specified by:

getArchitecture in class FunctionBase

getCanCreatePermissions

protected java.lang.Boolean getCanCreatePermissions()

Whether the addPermission() call adds any permissions.

True for new Lambdas, false for version $LATEST and imported Lambdas from different accounts.

Specified by:

getCanCreatePermissions in class FunctionBase

getConnections

public Connections getConnections()

Access the Connections object.

Will fail if not a VPC-enabled Lambda Function

Specified by:

getConnections in interface IConnectable

Overrides:

getConnections in class FunctionBase

getCurrentVersion

public Version getCurrentVersion()

Returns a `lambda.Version` which represents the current version of this singleton Lambda function. A new version will be created every time the function's configuration changes.

You can specify options for this version using the currentVersionOptions prop when initializing the lambda.SingletonFunction.

getFunctionArn

public java.lang.String getFunctionArn()

The ARN fo the function.

Specified by:

getFunctionArn in interface IClientVpnConnectionHandler

Specified by:

getFunctionArn in interface IFunction

Specified by:

getFunctionArn in class FunctionBase

getFunctionName

public java.lang.String getFunctionName()

The name of the function.

Specified by:

getFunctionName in interface IClientVpnConnectionHandler

Specified by:

getFunctionName in interface IFunction

Specified by:

getFunctionName in class FunctionBase

getGrantPrincipal

public IPrincipal getGrantPrincipal()

The principal this Lambda Function is running as.

Specified by:

getGrantPrincipal in interface IGrantable

Specified by:

getGrantPrincipal in class FunctionBase

getIsBoundToVpc

public java.lang.Boolean getIsBoundToVpc()

Whether or not this Lambda function was bound to a VPC.

If this is is false, trying to access the connections object will fail.

Specified by:

getIsBoundToVpc in interface IFunction

Overrides:

getIsBoundToVpc in class FunctionBase

getLogGroup

public ILogGroup getLogGroup()

The LogGroup where the Lambda function's logs are made available.

If either logRetention is set or this property is called, a CloudFormation custom resource is added to the stack that pre-creates the log group as part of the stack deployment, if it already doesn't exist, and sets the correct log retention period (never expire, by default).

Further, if the log group already exists and the logRetention is not set, the custom resource will reset the log retention to never expire even if it was configured with a different value.

getPermissionsNode

public ConstructNode getPermissionsNode()

The construct node where permissions are attached.

Specified by:

getPermissionsNode in interface IFunction

Specified by:

getPermissionsNode in class FunctionBase

getResourceArnsForGrantInvoke

public java.util.List<java.lang.String> getResourceArnsForGrantInvoke()

The ARN(s) to put into the resource field of the generated IAM policy for grantInvoke().

Specified by:

getResourceArnsForGrantInvoke in interface IFunction

Specified by:

getResourceArnsForGrantInvoke in class FunctionBase

getRuntime

public Runtime getRuntime()

The runtime environment for the Lambda function.

getRole

public IRole getRole()

The IAM role associated with this function.

Undefined if the function was imported without a role.

Specified by:

getRole in interface IFunction

Specified by:

getRole in class FunctionBase