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API Reference

Constructs

AcquireSemaphoreFragment

Initializers 

import { AcquireSemaphoreFragment } from 'cdk-concurrency-controller'

new AcquireSemaphoreFragment(scope: Construct, id: string, props: AcquireSemaphoreFragmentProps)
Name Type Description
scope constructs.Construct No description.
id string No description.
props AcquireSemaphoreFragmentProps No description.
scopeRequired
  • Type: constructs.Construct
idRequired
  • Type: string
propsRequired

Methods

Name Description
toString Returns a string representation of this construct.
next Continue normal execution with the given state.
prefixStates Prefix the IDs of all states in this state machine fragment.
toSingleState Wrap all states in this state machine fragment up into a single state.
toString 
public toString(): string

Returns a string representation of this construct.

next 
public next(next: IChainable): Chain

Continue normal execution with the given state.

nextRequired
  • Type: aws-cdk-lib.aws_stepfunctions.IChainable
prefixStates 
public prefixStates(prefix?: string): StateMachineFragment

Prefix the IDs of all states in this state machine fragment.

Use this to avoid multiple copies of the state machine all having the same state IDs.

prefixOptional
  • Type: string

The prefix to add.

Will use construct ID by default.

toSingleState 
public toSingleState(options?: SingleStateOptions): Parallel

Wrap all states in this state machine fragment up into a single state.

This can be used to add retry or error handling onto this state machine fragment.

Be aware that this changes the result of the inner state machine to be an array with the result of the state machine in it. Adjust your paths accordingly. For example, change 'outputPath' to '$[0]'.

optionsOptional
  • Type: aws-cdk-lib.aws_stepfunctions.SingleStateOptions

Static Functions

Name Description
isConstruct Checks if x is a construct.
isConstruct 
import { AcquireSemaphoreFragment } from 'cdk-concurrency-controller'

AcquireSemaphoreFragment.isConstruct(x: any)

Checks if x is a construct.

xRequired
  • Type: any

Any object.

Properties

Name Type Description
node constructs.Node The tree node.
endStates aws-cdk-lib.aws_stepfunctions.INextable[] The states to chain onto if this fragment is used.
id string Descriptive identifier for this chainable.
startState aws-cdk-lib.aws_stepfunctions.State The start state of this state machine fragment.
nodeRequired 
public readonly node: Node;
  • Type: constructs.Node

The tree node.

endStatesRequired 
public readonly endStates: INextable[];
  • Type: aws-cdk-lib.aws_stepfunctions.INextable[]

The states to chain onto if this fragment is used.

idRequired 
public readonly id: string;
  • Type: string

Descriptive identifier for this chainable.

startStateRequired 
public readonly startState: State;
  • Type: aws-cdk-lib.aws_stepfunctions.State

The start state of this state machine fragment.

AcquireViaStartExecutionFragment

Initializers 

import { AcquireViaStartExecutionFragment } from 'cdk-concurrency-controller'

new AcquireViaStartExecutionFragment(scope: Construct, id: string, props: AcquireViaStartExecutionFragmentProps)
Name Type Description
scope constructs.Construct No description.
id string No description.
props AcquireViaStartExecutionFragmentProps No description.
scopeRequired
  • Type: constructs.Construct
idRequired
  • Type: string
propsRequired

Methods

Name Description
toString Returns a string representation of this construct.
next Continue normal execution with the given state.
prefixStates Prefix the IDs of all states in this state machine fragment.
toSingleState Wrap all states in this state machine fragment up into a single state.
toString 
public toString(): string

Returns a string representation of this construct.

next 
public next(next: IChainable): Chain

Continue normal execution with the given state.

nextRequired
  • Type: aws-cdk-lib.aws_stepfunctions.IChainable
prefixStates 
public prefixStates(prefix?: string): StateMachineFragment

Prefix the IDs of all states in this state machine fragment.

Use this to avoid multiple copies of the state machine all having the same state IDs.

prefixOptional
  • Type: string

The prefix to add.

Will use construct ID by default.

toSingleState 
public toSingleState(options?: SingleStateOptions): Parallel

Wrap all states in this state machine fragment up into a single state.

This can be used to add retry or error handling onto this state machine fragment.

Be aware that this changes the result of the inner state machine to be an array with the result of the state machine in it. Adjust your paths accordingly. For example, change 'outputPath' to '$[0]'.

optionsOptional
  • Type: aws-cdk-lib.aws_stepfunctions.SingleStateOptions

Static Functions

Name Description
isConstruct Checks if x is a construct.
isConstruct 
import { AcquireViaStartExecutionFragment } from 'cdk-concurrency-controller'

AcquireViaStartExecutionFragment.isConstruct(x: any)

Checks if x is a construct.

xRequired
  • Type: any

Any object.

Properties

Name Type Description
node constructs.Node The tree node.
endStates aws-cdk-lib.aws_stepfunctions.INextable[] The states to chain onto if this fragment is used.
id string Descriptive identifier for this chainable.
startState aws-cdk-lib.aws_stepfunctions.State The start state of this state machine fragment.
nodeRequired 
public readonly node: Node;
  • Type: constructs.Node

The tree node.

endStatesRequired 
public readonly endStates: INextable[];
  • Type: aws-cdk-lib.aws_stepfunctions.INextable[]

The states to chain onto if this fragment is used.

idRequired 
public readonly id: string;
  • Type: string

Descriptive identifier for this chainable.

startStateRequired 
public readonly startState: State;
  • Type: aws-cdk-lib.aws_stepfunctions.State

The start state of this state machine fragment.

DistributedSemaphore

Initializers 

import { DistributedSemaphore } from 'cdk-concurrency-controller'

new DistributedSemaphore(scope: Construct, id: string, props?: DistributedSemaphoreProps)
Name Type Description
scope constructs.Construct No description.
id string No description.
props DistributedSemaphoreProps No description.
scopeRequired
  • Type: constructs.Construct
idRequired
  • Type: string
propsOptional

Methods

Name Description
toString Returns a string representation of this construct.
acquire Acquire a permit for a limited resource.
release Release the permit for the resource.
toString 
public toString(): string

Returns a string representation of this construct.

acquire 
public acquire(options?: AcquireOptions): StateMachineFragment

Acquire a permit for a limited resource.

optionsOptional

use default semaphore if not specified.

release 
public release(options?: ReleaseOptions): StateMachineFragment

Release the permit for the resource.

optionsOptional

use default semaphore if not specified.

Static Functions

Name Description
isConstruct Checks if x is a construct.
isConstruct 
import { DistributedSemaphore } from 'cdk-concurrency-controller'

DistributedSemaphore.isConstruct(x: any)

Checks if x is a construct.

xRequired
  • Type: any

Any object.

Properties

Name Type Description
node constructs.Node The tree node.
acquireSemaphoreStateMachine aws-cdk-lib.aws_stepfunctions.IStateMachine No description.
allSemaphores SemaphoreDefinition[] No description.
cleanupSemaphoreStateMachine aws-cdk-lib.aws_stepfunctions.IStateMachine No description.
defaultSemaphore SemaphoreDefinition No description.
releaseSemaphoreStateMachine aws-cdk-lib.aws_stepfunctions.IStateMachine No description.
semaphoreTable SemaphoreTableDefinition No description.
nodeRequired 
public readonly node: Node;
  • Type: constructs.Node

The tree node.

acquireSemaphoreStateMachineRequired 
public readonly acquireSemaphoreStateMachine: IStateMachine;
  • Type: aws-cdk-lib.aws_stepfunctions.IStateMachine
allSemaphoresRequired 
public readonly allSemaphores: SemaphoreDefinition[];
cleanupSemaphoreStateMachineRequired 
public readonly cleanupSemaphoreStateMachine: IStateMachine;
  • Type: aws-cdk-lib.aws_stepfunctions.IStateMachine
defaultSemaphoreRequired 
public readonly defaultSemaphore: SemaphoreDefinition;
releaseSemaphoreStateMachineRequired 
public readonly releaseSemaphoreStateMachine: IStateMachine;
  • Type: aws-cdk-lib.aws_stepfunctions.IStateMachine
semaphoreTableRequired 
public readonly semaphoreTable: SemaphoreTableDefinition;

ReleaseSemaphoreFragment

Initializers 

import { ReleaseSemaphoreFragment } from 'cdk-concurrency-controller'

new ReleaseSemaphoreFragment(scope: Construct, id: string, props: ReleaseSemaphoreFragmentProps)
Name Type Description
scope constructs.Construct No description.
id string No description.
props ReleaseSemaphoreFragmentProps No description.
scopeRequired
  • Type: constructs.Construct
idRequired
  • Type: string
propsRequired

Methods

Name Description
toString Returns a string representation of this construct.
next Continue normal execution with the given state.
prefixStates Prefix the IDs of all states in this state machine fragment.
toSingleState Wrap all states in this state machine fragment up into a single state.
toString 
public toString(): string

Returns a string representation of this construct.

next 
public next(next: IChainable): Chain

Continue normal execution with the given state.

nextRequired
  • Type: aws-cdk-lib.aws_stepfunctions.IChainable
prefixStates 
public prefixStates(prefix?: string): StateMachineFragment

Prefix the IDs of all states in this state machine fragment.

Use this to avoid multiple copies of the state machine all having the same state IDs.

prefixOptional
  • Type: string

The prefix to add.

Will use construct ID by default.

toSingleState 
public toSingleState(options?: SingleStateOptions): Parallel

Wrap all states in this state machine fragment up into a single state.

This can be used to add retry or error handling onto this state machine fragment.

Be aware that this changes the result of the inner state machine to be an array with the result of the state machine in it. Adjust your paths accordingly. For example, change 'outputPath' to '$[0]'.

optionsOptional
  • Type: aws-cdk-lib.aws_stepfunctions.SingleStateOptions

Static Functions

Name Description
isConstruct Checks if x is a construct.
isConstruct 
import { ReleaseSemaphoreFragment } from 'cdk-concurrency-controller'

ReleaseSemaphoreFragment.isConstruct(x: any)

Checks if x is a construct.

xRequired
  • Type: any

Any object.

Properties

Name Type Description
node constructs.Node The tree node.
endStates aws-cdk-lib.aws_stepfunctions.INextable[] The states to chain onto if this fragment is used.
id string Descriptive identifier for this chainable.
startState aws-cdk-lib.aws_stepfunctions.State The start state of this state machine fragment.
nodeRequired 
public readonly node: Node;
  • Type: constructs.Node

The tree node.

endStatesRequired 
public readonly endStates: INextable[];
  • Type: aws-cdk-lib.aws_stepfunctions.INextable[]

The states to chain onto if this fragment is used.

idRequired 
public readonly id: string;
  • Type: string

Descriptive identifier for this chainable.

startStateRequired 
public readonly startState: State;
  • Type: aws-cdk-lib.aws_stepfunctions.State

The start state of this state machine fragment.

ReleaseViaStartExecutionFragment

Initializers 

import { ReleaseViaStartExecutionFragment } from 'cdk-concurrency-controller'

new ReleaseViaStartExecutionFragment(scope: Construct, id: string, props: ReleaseViaStartExecutionFragmentProps)
Name Type Description
scope constructs.Construct No description.
id string No description.
props ReleaseViaStartExecutionFragmentProps No description.
scopeRequired
  • Type: constructs.Construct
idRequired
  • Type: string
propsRequired

Methods

Name Description
toString Returns a string representation of this construct.
next Continue normal execution with the given state.
prefixStates Prefix the IDs of all states in this state machine fragment.
toSingleState Wrap all states in this state machine fragment up into a single state.
toString 
public toString(): string

Returns a string representation of this construct.

next 
public next(next: IChainable): Chain

Continue normal execution with the given state.

nextRequired
  • Type: aws-cdk-lib.aws_stepfunctions.IChainable
prefixStates 
public prefixStates(prefix?: string): StateMachineFragment

Prefix the IDs of all states in this state machine fragment.

Use this to avoid multiple copies of the state machine all having the same state IDs.

prefixOptional
  • Type: string

The prefix to add.

Will use construct ID by default.

toSingleState 
public toSingleState(options?: SingleStateOptions): Parallel

Wrap all states in this state machine fragment up into a single state.

This can be used to add retry or error handling onto this state machine fragment.

Be aware that this changes the result of the inner state machine to be an array with the result of the state machine in it. Adjust your paths accordingly. For example, change 'outputPath' to '$[0]'.

optionsOptional
  • Type: aws-cdk-lib.aws_stepfunctions.SingleStateOptions

Static Functions

Name Description
isConstruct Checks if x is a construct.
isConstruct 
import { ReleaseViaStartExecutionFragment } from 'cdk-concurrency-controller'

ReleaseViaStartExecutionFragment.isConstruct(x: any)

Checks if x is a construct.

xRequired
  • Type: any

Any object.

Properties

Name Type Description
node constructs.Node The tree node.
endStates aws-cdk-lib.aws_stepfunctions.INextable[] The states to chain onto if this fragment is used.
id string Descriptive identifier for this chainable.
startState aws-cdk-lib.aws_stepfunctions.State The start state of this state machine fragment.
nodeRequired 
public readonly node: Node;
  • Type: constructs.Node

The tree node.

endStatesRequired 
public readonly endStates: INextable[];
  • Type: aws-cdk-lib.aws_stepfunctions.INextable[]

The states to chain onto if this fragment is used.

idRequired 
public readonly id: string;
  • Type: string

Descriptive identifier for this chainable.

startStateRequired 
public readonly startState: State;
  • Type: aws-cdk-lib.aws_stepfunctions.State

The start state of this state machine fragment.

Structs

AcquireOptions

Initializer 

import { AcquireOptions } from 'cdk-concurrency-controller'

const acquireOptions: AcquireOptions = { ... }

Properties

Name Type Description
name string The name for the semaphore.
userId string The semaphore user id to acquire/release resource usage.
nextTryWaitTime string Wait a fixed amount of time (in second) for another try to acquire semaphore if not acquired in previous tries.
timeout aws-cdk-lib.Duration Maximum run time for the execution.
nameRequired 
public readonly name: string;
  • Type: string

The name for the semaphore.

Or it can be JsonPath expression that extracts the value from the state object at runtime. This allows custom semaphore names from runtime input for multiple resources.

Example value: $.semaphoreName

userIdRequired 
public readonly userId: string;
  • Type: string

The semaphore user id to acquire/release resource usage.

nextTryWaitTimeOptional 
public readonly nextTryWaitTime: string;
  • Type: string
  • Default: '3' seconds

Wait a fixed amount of time (in second) for another try to acquire semaphore if not acquired in previous tries.

timeoutOptional 
public readonly timeout: Duration;
  • Type: aws-cdk-lib.Duration
  • Default: No timeout

Maximum run time for the execution.

AcquireSemaphoreFragmentProps

Initializer 

import { AcquireSemaphoreFragmentProps } from 'cdk-concurrency-controller'

const acquireSemaphoreFragmentProps: AcquireSemaphoreFragmentProps = { ... }

Properties

Name Type Description
name string The name for the semaphore.
userId string The semaphore user id to acquire/release resource usage.
nextTryWaitTime string Wait a fixed amount of time (in second) for another try to acquire semaphore if not acquired in previous tries.
limit string The value for concurrency control.
semaphoreTable SemaphoreTableDefinition The DynamoDB table to use for the semaphore.
retryStrategy aws-cdk-lib.aws_stepfunctions.RetryProps Retry strategy on Errors.ALL when releasing a semaphore use from the semaphore table.
nameRequired 
public readonly name: string;
  • Type: string

The name for the semaphore.

Or it can be JsonPath expression that extracts the value from the state object at runtime. This allows custom semaphore names from runtime input for multiple resources.

Example value: $.semaphoreName

userIdRequired 
public readonly userId: string;
  • Type: string

The semaphore user id to acquire/release resource usage.

nextTryWaitTimeOptional 
public readonly nextTryWaitTime: string;
  • Type: string
  • Default: '3' seconds

Wait a fixed amount of time (in second) for another try to acquire semaphore if not acquired in previous tries.

limitRequired 
public readonly limit: string;
  • Type: string

The value for concurrency control.

semaphoreTableRequired 
public readonly semaphoreTable: SemaphoreTableDefinition;

The DynamoDB table to use for the semaphore.

retryStrategyOptional 
public readonly retryStrategy: RetryProps;
  • Type: aws-cdk-lib.aws_stepfunctions.RetryProps
  • Default: '{ interval: Duration.seconds(1), maxAttempts: 5, backoffRate: 1.5 }'

Retry strategy on Errors.ALL when releasing a semaphore use from the semaphore table.

NOTE: errors property is always overridden to [Errors.ALL].

AcquireSemaphoreOptions

Initializer 

import { AcquireSemaphoreOptions } from 'cdk-concurrency-controller'

const acquireSemaphoreOptions: AcquireSemaphoreOptions = { ... }

Properties

Name Type Description
name string The name for the semaphore.
userId string The semaphore user id to acquire/release resource usage.
nextTryWaitTime string Wait a fixed amount of time (in second) for another try to acquire semaphore if not acquired in previous tries.
nameRequired 
public readonly name: string;
  • Type: string

The name for the semaphore.

Or it can be JsonPath expression that extracts the value from the state object at runtime. This allows custom semaphore names from runtime input for multiple resources.

Example value: $.semaphoreName

userIdRequired 
public readonly userId: string;
  • Type: string

The semaphore user id to acquire/release resource usage.

nextTryWaitTimeOptional 
public readonly nextTryWaitTime: string;
  • Type: string
  • Default: '3' seconds

Wait a fixed amount of time (in second) for another try to acquire semaphore if not acquired in previous tries.

AcquireSemaphoreTaskInput

Initializer 

import { AcquireSemaphoreTaskInput } from 'cdk-concurrency-controller'

const acquireSemaphoreTaskInput: AcquireSemaphoreTaskInput = { ... }

Properties

Name Type Description
limit string No description.
name string No description.
nextTryWaitTime string No description.
userId string No description.
limitRequired 
public readonly limit: string;
  • Type: string
nameRequired 
public readonly name: string;
  • Type: string
nextTryWaitTimeRequired 
public readonly nextTryWaitTime: string;
  • Type: string
userIdRequired 
public readonly userId: string;
  • Type: string

AcquireViaStartExecutionFragmentProps

Initializer 

import { AcquireViaStartExecutionFragmentProps } from 'cdk-concurrency-controller'

const acquireViaStartExecutionFragmentProps: AcquireViaStartExecutionFragmentProps = { ... }

Properties

Name Type Description
timeout aws-cdk-lib.Duration Maximum run time for the execution.
input AcquireSemaphoreTaskInput No description.
stateMachine aws-cdk-lib.aws_stepfunctions.IStateMachine The Step Functions state machine to start the execution on.
timeoutOptional 
public readonly timeout: Duration;
  • Type: aws-cdk-lib.Duration
  • Default: No timeout

Maximum run time for the execution.

inputRequired 
public readonly input: AcquireSemaphoreTaskInput;
stateMachineRequired 
public readonly stateMachine: IStateMachine;
  • Type: aws-cdk-lib.aws_stepfunctions.IStateMachine

The Step Functions state machine to start the execution on.

DistributedSemaphoreProps

Initializer 

import { DistributedSemaphoreProps } from 'cdk-concurrency-controller'

const distributedSemaphoreProps: DistributedSemaphoreProps = { ... }

Properties

Name Type Description
acquireSemaphoreStateMachineProps SemaphoreStateMachineProps No description.
cleanupSemaphoreStateMachineProps SemaphoreStateMachineProps No description.
defaultSemaphore SemaphoreDefinition The default semaphore settings.
releaseSemaphoreStateMachineProps SemaphoreStateMachineProps No description.
semaphores SemaphoreDefinition[] No description.
acquireSemaphoreStateMachinePropsOptional 
public readonly acquireSemaphoreStateMachineProps: SemaphoreStateMachineProps;
cleanupSemaphoreStateMachinePropsOptional 
public readonly cleanupSemaphoreStateMachineProps: SemaphoreStateMachineProps;
defaultSemaphoreOptional 
public readonly defaultSemaphore: SemaphoreDefinition;

The default semaphore settings.

It is used when no other pattern of semaphore applied. This can be used as a quick start when working with a single arbitrary resource.

NOTE: the default semaphore name cannot use JsonPath expression for the sake of a safe fallback.

releaseSemaphoreStateMachinePropsOptional 
public readonly releaseSemaphoreStateMachineProps: SemaphoreStateMachineProps;
semaphoresOptional 
public readonly semaphores: SemaphoreDefinition[];

ReleaseOptions

Initializer 

import { ReleaseOptions } from 'cdk-concurrency-controller'

const releaseOptions: ReleaseOptions = { ... }

Properties

Name Type Description
name string The name for the semaphore.
userId string The semaphore user id to acquire/release resource usage.
checkSemaphoreUseFirst boolean Check if the semaphore use exists before trying to release it.
timeout aws-cdk-lib.Duration Maximum run time for the execution.
nameRequired 
public readonly name: string;
  • Type: string

The name for the semaphore.

Or it can be JsonPath expression that extracts the value from the state object at runtime. This allows custom semaphore names from runtime input for multiple resources.

Example value: $.semaphoreName

userIdRequired 
public readonly userId: string;
  • Type: string

The semaphore user id to acquire/release resource usage.

checkSemaphoreUseFirstOptional 
public readonly checkSemaphoreUseFirst: boolean;
  • Type: boolean
  • Default: false

Check if the semaphore use exists before trying to release it.

This can help to shift the load from write capacity to read capacity in case of missing semaphore use (best effort to avoid hot partitions and save write capacity for crucial actions), where DDB provides 3x throughput on read capacity than write capacity per partition. see more about hot partition: https://aws.amazon.com/premiumsupport/knowledge-center/dynamodb-table-throttled/#You_have_a_hot_partition_in_your_table

timeoutOptional 
public readonly timeout: Duration;
  • Type: aws-cdk-lib.Duration
  • Default: No timeout

Maximum run time for the execution.

ReleaseSemaphoreFragmentProps

Initializer 

import { ReleaseSemaphoreFragmentProps } from 'cdk-concurrency-controller'

const releaseSemaphoreFragmentProps: ReleaseSemaphoreFragmentProps = { ... }

Properties

Name Type Description
name string The name for the semaphore.
userId string The semaphore user id to acquire/release resource usage.
checkSemaphoreUseFirst boolean Check if the semaphore use exists before trying to release it.
semaphoreTable SemaphoreTableDefinition The DynamoDB table to use for the semaphore.
retryStrategy aws-cdk-lib.aws_stepfunctions.RetryProps Retry strategy on Errors.ALL when releasing a semaphore use from the semaphore table.
nameRequired 
public readonly name: string;
  • Type: string

The name for the semaphore.

Or it can be JsonPath expression that extracts the value from the state object at runtime. This allows custom semaphore names from runtime input for multiple resources.

Example value: $.semaphoreName

userIdRequired 
public readonly userId: string;
  • Type: string

The semaphore user id to acquire/release resource usage.

checkSemaphoreUseFirstOptional 
public readonly checkSemaphoreUseFirst: boolean;
  • Type: boolean
  • Default: false

Check if the semaphore use exists before trying to release it.

This can help to shift the load from write capacity to read capacity in case of missing semaphore use (best effort to avoid hot partitions and save write capacity for crucial actions), where DDB provides 3x throughput on read capacity than write capacity per partition. see more about hot partition: https://aws.amazon.com/premiumsupport/knowledge-center/dynamodb-table-throttled/#You_have_a_hot_partition_in_your_table

semaphoreTableRequired 
public readonly semaphoreTable: SemaphoreTableDefinition;

The DynamoDB table to use for the semaphore.

retryStrategyOptional 
public readonly retryStrategy: RetryProps;
  • Type: aws-cdk-lib.aws_stepfunctions.RetryProps
  • Default: '{ interval: Duration.seconds(1), maxAttempts: 5, backoffRate: 1.5 }'

Retry strategy on Errors.ALL when releasing a semaphore use from the semaphore table.

NOTE: errors property is always overridden to [Errors.ALL].

ReleaseSemaphoreOptions

Initializer 

import { ReleaseSemaphoreOptions } from 'cdk-concurrency-controller'

const releaseSemaphoreOptions: ReleaseSemaphoreOptions = { ... }

Properties

Name Type Description
name string The name for the semaphore.
userId string The semaphore user id to acquire/release resource usage.
checkSemaphoreUseFirst boolean Check if the semaphore use exists before trying to release it.
nameRequired 
public readonly name: string;
  • Type: string

The name for the semaphore.

Or it can be JsonPath expression that extracts the value from the state object at runtime. This allows custom semaphore names from runtime input for multiple resources.

Example value: $.semaphoreName

userIdRequired 
public readonly userId: string;
  • Type: string

The semaphore user id to acquire/release resource usage.

checkSemaphoreUseFirstOptional 
public readonly checkSemaphoreUseFirst: boolean;
  • Type: boolean
  • Default: false

Check if the semaphore use exists before trying to release it.

This can help to shift the load from write capacity to read capacity in case of missing semaphore use (best effort to avoid hot partitions and save write capacity for crucial actions), where DDB provides 3x throughput on read capacity than write capacity per partition. see more about hot partition: https://aws.amazon.com/premiumsupport/knowledge-center/dynamodb-table-throttled/#You_have_a_hot_partition_in_your_table

ReleaseSemaphoreTaskInput

Initializer 

import { ReleaseSemaphoreTaskInput } from 'cdk-concurrency-controller'

const releaseSemaphoreTaskInput: ReleaseSemaphoreTaskInput = { ... }

Properties

Name Type Description
name string No description.
userId string No description.
nameRequired 
public readonly name: string;
  • Type: string
userIdRequired 
public readonly userId: string;
  • Type: string

ReleaseViaStartExecutionFragmentProps

Initializer 

import { ReleaseViaStartExecutionFragmentProps } from 'cdk-concurrency-controller'

const releaseViaStartExecutionFragmentProps: ReleaseViaStartExecutionFragmentProps = { ... }

Properties

Name Type Description
timeout aws-cdk-lib.Duration Maximum run time for the execution.
input ReleaseSemaphoreTaskInput No description.
stateMachine aws-cdk-lib.aws_stepfunctions.IStateMachine The Step Functions state machine to start the execution on.
timeoutOptional 
public readonly timeout: Duration;
  • Type: aws-cdk-lib.Duration
  • Default: No timeout

Maximum run time for the execution.

inputRequired 
public readonly input: ReleaseSemaphoreTaskInput;
stateMachineRequired 
public readonly stateMachine: IStateMachine;
  • Type: aws-cdk-lib.aws_stepfunctions.IStateMachine

The Step Functions state machine to start the execution on.

SemaphoreDefinition

Initializer 

import { SemaphoreDefinition } from 'cdk-concurrency-controller'

const semaphoreDefinition: SemaphoreDefinition = { ... }

Properties

Name Type Description
limit string The value for concurrency control.
name string The name for the semaphore.
limitRequired 
public readonly limit: string;
  • Type: string

The value for concurrency control.

nameRequired 
public readonly name: string;
  • Type: string

The name for the semaphore.

Or it can be JsonPath expression that extracts the value from the state object at runtime. This allows custom semaphore names from runtime input for multiple resources.

Example value: $.semaphoreName

SemaphoreStateMachineProps

Initializer 

import { SemaphoreStateMachineProps } from 'cdk-concurrency-controller'

const semaphoreStateMachineProps: SemaphoreStateMachineProps = { ... }

Properties

Name Type Description
timeout aws-cdk-lib.Duration Maximum run time for the execution.
logs aws-cdk-lib.aws_stepfunctions.LogOptions Defines what execution history events are logged and where they are logged.
tracingEnabled boolean Specifies whether Amazon X-Ray tracing is enabled for this state machine.
timeoutOptional 
public readonly timeout: Duration;
  • Type: aws-cdk-lib.Duration
  • Default: No timeout

Maximum run time for the execution.

logsOptional 
public readonly logs: LogOptions;
  • Type: aws-cdk-lib.aws_stepfunctions.LogOptions
  • Default: No logging

Defines what execution history events are logged and where they are logged.

tracingEnabledOptional 
public readonly tracingEnabled: boolean;
  • Type: boolean
  • Default: false

Specifies whether Amazon X-Ray tracing is enabled for this state machine.

SemaphoreTableDefinition

Initializer 

import { SemaphoreTableDefinition } from 'cdk-concurrency-controller'

const semaphoreTableDefinition: SemaphoreTableDefinition = { ... }

Properties

Name Type Description
countAttributeName string The attribute name for a semaphore in-use count.
partitionKey aws-cdk-lib.aws_dynamodb.Attribute No description.
table aws-cdk-lib.aws_dynamodb.ITable No description.
countAttributeNameRequired 
public readonly countAttributeName: string;
  • Type: string

The attribute name for a semaphore in-use count.

partitionKeyRequired 
public readonly partitionKey: Attribute;
  • Type: aws-cdk-lib.aws_dynamodb.Attribute
tableRequired 
public readonly table: ITable;
  • Type: aws-cdk-lib.aws_dynamodb.ITable

SemaphoreTimeoutOptions

Initializer 

import { SemaphoreTimeoutOptions } from 'cdk-concurrency-controller'

const semaphoreTimeoutOptions: SemaphoreTimeoutOptions = { ... }

Properties

Name Type Description
timeout aws-cdk-lib.Duration Maximum run time for the execution.
timeoutOptional 
public readonly timeout: Duration;
  • Type: aws-cdk-lib.Duration
  • Default: No timeout

Maximum run time for the execution.

SemaphoreUseDefinition

Initializer 

import { SemaphoreUseDefinition } from 'cdk-concurrency-controller'

const semaphoreUseDefinition: SemaphoreUseDefinition = { ... }

Properties

Name Type Description
name string The name for the semaphore.
userId string The semaphore user id to acquire/release resource usage.
nameRequired 
public readonly name: string;
  • Type: string

The name for the semaphore.

Or it can be JsonPath expression that extracts the value from the state object at runtime. This allows custom semaphore names from runtime input for multiple resources.

Example value: $.semaphoreName

userIdRequired 
public readonly userId: string;
  • Type: string

The semaphore user id to acquire/release resource usage.