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  • const parallel = new sfn.Parallel(this, 'Do the work in parallel');
    
    // Add branches to be executed in parallel
    const shipItem = new sfn.Pass(this, 'ShipItem');
    const sendInvoice = new sfn.Pass(this, 'SendInvoice');
    const restock = new sfn.Pass(this, 'Restock');
    parallel.branch(shipItem);
    parallel.branch(sendInvoice);
    parallel.branch(restock);
    
    // Retry the whole workflow if something goes wrong
    parallel.addRetry({ maxAttempts: 1 });
    
    // How to recover from errors
    const sendFailureNotification = new sfn.Pass(this, 'SendFailureNotification');
    parallel.addCatch(sendFailureNotification);
    
    // What to do in case everything succeeded
    const closeOrder = new sfn.Pass(this, 'CloseOrder');
    parallel.next(closeOrder);
    
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  • // Makes the current JSON state { ..., "subObject": { "hello": "world" } }
    const pass = new sfn.Pass(this, 'Add Hello World', {
      result: sfn.Result.fromObject({ hello: 'world' }),
      resultPath: '$.subObject',
    });
    
    // Set the next state
    const nextState = new sfn.Pass(this, 'NextState');
    pass.next(nextState);
    
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  • const convertToSeconds = new tasks.EvaluateExpression(this, 'Convert to seconds', {
      expression: '$.waitMilliseconds / 1000',
      resultPath: '$.waitSeconds',
    });
    
    const createMessage = new tasks.EvaluateExpression(this, 'Create message', {
      // Note: this is a string inside a string.
      expression: '`Now waiting ${$.waitSeconds} seconds...`',
      runtime: lambda.Runtime.NODEJS_14_X,
      resultPath: '$.message',
    });
    
    const publishMessage = new tasks.SnsPublish(this, 'Publish message', {
      topic: new sns.Topic(this, 'cool-topic'),
      message: sfn.TaskInput.fromJsonPathAt('$.message'),
      resultPath: '$.sns',
    });
    
    const wait = new sfn.Wait(this, 'Wait', {
      time: sfn.WaitTime.secondsPath('$.waitSeconds'),
    });
    
    new sfn.StateMachine(this, 'StateMachine', {
      definition: convertToSeconds
        .next(createMessage)
        .next(publishMessage)
        .next(wait),
    });
    
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  • const convertToSeconds = new tasks.EvaluateExpression(this, 'Convert to seconds', {
      expression: '$.waitMilliseconds / 1000',
      resultPath: '$.waitSeconds',
    });
    
    const createMessage = new tasks.EvaluateExpression(this, 'Create message', {
      // Note: this is a string inside a string.
      expression: '`Now waiting ${$.waitSeconds} seconds...`',
      runtime: lambda.Runtime.NODEJS_14_X,
      resultPath: '$.message',
    });
    
    const publishMessage = new tasks.SnsPublish(this, 'Publish message', {
      topic: new sns.Topic(this, 'cool-topic'),
      message: sfn.TaskInput.fromJsonPathAt('$.message'),
      resultPath: '$.sns',
    });
    
    const wait = new sfn.Wait(this, 'Wait', {
      time: sfn.WaitTime.secondsPath('$.waitSeconds'),
    });
    
    new sfn.StateMachine(this, 'StateMachine', {
      definition: convertToSeconds
        .next(createMessage)
        .next(publishMessage)
        .next(wait),
    });
    
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  • import * as lambda from '@aws-cdk/aws-lambda';
    
    declare const submitLambda: lambda.Function;
    declare const getStatusLambda: lambda.Function;
    
    const submitJob = new tasks.LambdaInvoke(this, 'Submit Job', {
      lambdaFunction: submitLambda,
      // Lambda's result is in the attribute `Payload`
      outputPath: '$.Payload',
    });
    
    const waitX = new sfn.Wait(this, 'Wait X Seconds', {
      time: sfn.WaitTime.secondsPath('$.waitSeconds'),
    });
    
    const getStatus = new tasks.LambdaInvoke(this, 'Get Job Status', {
      lambdaFunction: getStatusLambda,
      // Pass just the field named "guid" into the Lambda, put the
      // Lambda's result in a field called "status" in the response
      inputPath: '$.guid',
      outputPath: '$.Payload',
    });
    
    const jobFailed = new sfn.Fail(this, 'Job Failed', {
      cause: 'AWS Batch Job Failed',
      error: 'DescribeJob returned FAILED',
    });
    
    const finalStatus = new tasks.LambdaInvoke(this, 'Get Final Job Status', {
      lambdaFunction: getStatusLambda,
      // Use "guid" field as input
      inputPath: '$.guid',
      outputPath: '$.Payload',
    });
    
    const definition = submitJob
      .next(waitX)
      .next(getStatus)
      .next(new sfn.Choice(this, 'Job Complete?')
        // Look at the "status" field
        .when(sfn.Condition.stringEquals('$.status', 'FAILED'), jobFailed)
        .when(sfn.Condition.stringEquals('$.status', 'SUCCEEDED'), finalStatus)
        .otherwise(waitX));
    
    new sfn.StateMachine(this, 'StateMachine', {
      definition,
      timeout: Duration.minutes(5),
    });
    
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