{"id":60781,"date":"2016-10-11T10:00:47","date_gmt":"2016-10-11T07:00:47","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=60781"},"modified":"2016-10-10T17:14:41","modified_gmt":"2016-10-10T14:14:41","slug":"java-aws-cloud-using-lambda","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2016\/10\/java-aws-cloud-using-lambda.html","title":{"rendered":"Java on the AWS cloud using Lambda"},"content":{"rendered":"

Amazon Web Services gets more popular by the day. Java is a first class citizen on AWS and it is pretty easy to get started.
\nDeploying your application is a bit different, but still easy and convenient.<\/p>\n

\n

AWS Lambda<\/a> is a compute service where you can upload your code to AWS Lambda and the service can run the code on your behalf using AWS infrastructure. After you upload your code and create what we call a Lambda function, AWS Lambda takes care of provisioning and managing the servers that you use to run the code.<\/p>\n<\/blockquote>\n

Actually think of lambda as running a task that needs up to five minutes to finish. In case of simple actions or jobs that are not time consuming, and don\u2019t require a huge framework, AWS lambda is the way to go. Also AWS lambda is great for horizontal scaling.<\/p>\n

The most stripped down example would be to create a lambda function that responds to a request.<\/p>\n

We shall implement the RequestHandler interface.<\/p>\n

package com.gkatzioura.deployment.lambda;\r\n\r\nimport com.amazonaws.services.lambda.runtime.Context;\r\nimport com.amazonaws.services.lambda.runtime.RequestHandler;\r\n\r\nimport java.util.Map;\r\nimport java.util.logging.Logger;\r\n\r\n\/**\r\n * Created by gkatzioura on 9\/10\/2016.\r\n *\/\r\npublic class RequestFunctionHandler implements RequestHandler<Map<String,String>,String> {\r\n\r\n    private static final Logger LOGGER = Logger.getLogger(RequestFunctionHandler.class.getName());\r\n\r\n    public String handleRequest(Map <String,String> values, Context context) {\r\n\r\n        LOGGER.info(\"Handling request\");\r\n\r\n        return \"You invoked a lambda function\";\r\n    }\r\n\r\n}<\/pre>\n
Somehow RequestHandler is like a controller.
 
<\/div> <\/div><\/p>\n
To proceed we will have to create a jar file with the dependencies needed, therefore we will create a custom gradle task<\/p>\n
apply plugin: 'java'\r\n\r\nrepositories {\r\n    mavenCentral()\r\n}\r\n\r\ndependencies {\r\n    compile (\r\n            'com.amazonaws:aws-lambda-java-core:1.1.0',\r\n            'com.amazonaws:aws-lambda-java-events:1.1.0'\r\n    )\r\n}\r\n\r\ntask buildZip(type: Zip) {\r\n    from compileJava\r\n    from processResources\r\n    into('lib') {\r\n        from configurations.runtime\r\n    }\r\n}\r\n\r\nbuild.dependsOn buildZip<\/pre>\n
Then we should build<\/p>\n
gradle build<\/pre>\n
Now we have to upload our code to our lambda function.<\/p>\n
I have a s3 bucket on amazon for lambda functions only. Supposing that our bucket is called lambda-functions (I am pretty sure it is already reserved).\u00a0We will use aws cli<\/a> wherever possible.<\/p>\n
aws s3 cp build\/distributions\/JavaLambdaDeployment.zip s3:\/\/lambda-functions\/JavaLambdaDeployment.zip<\/pre>\n
Now instead of creating a lambda function the manual way we are going to do so by creating a cloud formation template.<\/p>\n
{\r\n  \"AWSTemplateFormatVersion\": \"2010-09-09\",\r\n  \"Resources\": {\r\n    \"LF9MBL\": {\r\n      \"Type\": \"AWS::Lambda::Function\",\r\n      \"Properties\": {\r\n        \"Code\": {\r\n          \"S3Bucket\": \"lambda-functions\",\r\n          \"S3Key\" : \"JavaLambdaDeployment.zip\",\r\n        },\r\n        \"FunctionName\": \"SimpleRequest\",\r\n        \"Handler\": \"com.gkatzioura.deployment.lambda.RequestFunctionHandler\",\r\n        \"MemorySize\": 128,\r\n        \"Role\":\"arn:aws:iam::274402012893:role\/lambda_basic_execution\",\r\n        \"Runtime\":\"java8\"\r\n      },\r\n      \"Metadata\": {\r\n        \"AWS::CloudFormation::Designer\": {\r\n          \"id\": \"66b2b325-f19a-4d7d-a7a9-943dd8cd4a5c\"\r\n        }\r\n      }\r\n    }\r\n  }\r\n}<\/pre>\n
Next step is to upload our cloudformation template to an s3 bucket. Personally I use a separate bucket for my templates. Supposing that our bucket is called cloudformation-templates<\/p>\n
aws s3 cp cloudformationjavalambda.template s3:\/\/cloudformation-templates\/cloudformationjavalambda.template<\/pre>\n
Next step is to create our cloudformation stack using the template specified<\/p>\n
aws cloudformation create-stack --stack-name JavaLambdaStack --template-url https:\/\/s3.amazonaws.com\/cloudformation-templates\/cloudformationjavalambda.template<\/pre>\n
In order to check we shall invoke the lambda function through the amazon cli<\/p>\n
aws lambda invoke --invocation-type RequestResponse --function-name SimpleRequest --region eu-west-1 --log-type Tail --payload '{}' outputfile.txt<\/pre>\n
And the result is the expected<\/p>\n
\"You invoked a lambda function\"<\/pre>\n
You can find the source code on github<\/a>.<\/p>\n
\n\n\n\n
Reference: <\/span><\/td>\nJava on the AWS cloud using Lambda<\/a> from our JCG partner<\/a> Emmanouil Gkatziouras at the gkatzioura<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Amazon Web Services gets more popular by the day. Java is a first class citizen on AWS and it is pretty easy to get started. Deploying your application is a bit different, but still easy and convenient. AWS Lambda is a compute service where you can upload your code to AWS Lambda and the service …<\/p>\n","protected":false},"author":936,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[331],"class_list":["post-60781","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-amazon-aws"],"yoast_head":"\nJava on the AWS cloud using Lambda - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Amazon Web Services gets more popular by the day. Java is a first class citizen on AWS and it is pretty easy to get started. 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