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AWS Lambda

Lambda is the key enabler and a core AWS component for serverless computing. Lets you run the code you want, without worrying about the underlying infrastructure and provisioning. It is also cost efficient, as there are no instances that are in running state but idle. Lambda handles scaling up and scaling down as needed, transparently to the customer.

Components

• Event Source - Changes in state of the resources or data, or any events triggered explicitly or implicitly. A large number of AWS services can act as Event Sources - Like S3 (Object PUT, DELETE..), DynamoDB, IoT, CloudFormation, CloudWatch, SNS, API Gateway and Cron schedule to name a few.

• Function - The piece of code that would be run when that event occurs. The function can access any services downstream if needed. Currently Supported languages are Node.js, Python, Java 8 and C#.

Use cases

• Stateless, event-based file/data processing.

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Working with Serverless and Java - Part 1

In this tutorial, we will create and deploy a java-maven based serverless service using the serverless project (https://serverless.com/). In this part we will not modify any code, or even look at the generated code. We will focus on the deployment and the command line interface provided by serverless. Serverless is a node.js based framework that makes creating, deploying, and managing serverless functions a breeze. We will use AWS as our FaaS (Function-as-a-Service) provider.

Pre-requisites

Here is what the setup on my Mac looks like (Sierra)

• brew (1.1.10) - you will need this if you do not have node/npm installed already.
• node (v7.6.0)
• npm (4.1.2)
• Apache Maven (3.2.5)

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Starting localstack

C02STG51GTFM:localstack mpandit$ make infra
. .venv/bin/activate; exec localstack/mock/infra.py
Starting local dev environment. CTRL-C to quit.
Starting local Elasticsearch (port 4571)...
Starting mock ES service (port 4578)...
Starting mock S3 server (port 4572)...
Starting mock SNS server (port 4575)...

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<?xml version='1.0' encoding='UTF-8'?>
<maven2-moduleset plugin="maven-plugin@2.15.1">
  <actions/>
  <description></description>
  <keepDependencies>false</keepDependencies>
  <properties/>
  <scm class="hudson.plugins.git.GitSCM" plugin="git@3.2.0">
    <configVersion>2</configVersion>
    <userRemoteConfigs>
      <hudson.plugins.git.UserRemoteConfig>

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<?xml version='1.0' encoding='UTF-8'?>
<project>
  <actions/>
  <description></description>
  <keepDependencies>false</keepDependencies>
  <properties>
    <hudson.model.ParametersDefinitionProperty>
      <parameterDefinitions>
        <hudson.model.StringParameterDefinition>
          <name>Build</name>

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FROM ubuntu:latest
RUN apt-get -y update && apt-get -y upgrade
RUN apt-get -y install openjdk-8-jdk wget
RUN mkdir /usr/local/tomcat
RUN wget http://www-us.apache.org/dist/tomcat/tomcat-8/v8.5.16/bin/apache-tomcat-8.5.16.tar.gz -O /tmp/tomcat.tar.gz
RUN cd /tmp && tar xvfz tomcat.tar.gz
RUN cp -Rv /tmp/apache-tomcat-8.5.16/* /usr/local/tomcat/
EXPOSE 8080
CMD /usr/local/tomcat/bin/catalina.sh run

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package com.marqeta.mqpay;

import java.util.HashMap;
import java.util.Map;

public class Main {

    public static void main(String[] args) {
        System.out.println("via Reflection took " + instantiateViaReflection() + " milliseconds");
        System.out.println("via New took " + instantiateAsNew() + " milliseconds");

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<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You under the Apache License, Version 2.0
 (the "License"); you may not use this file except in compliance with
 the License.  You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

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############################
# MongoDBStore properties  #
############################
gora.datastore.default=org.apache.gora.mongodb.store.MongoStore
gora.mongodb.override_hadoop_configuration=false
gora.mongodb.mapping.file=/gora-mongodb-mapping.xml
gora.mongodb.servers=localhost:27017
gora.mongodb.db=nutchdb

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<?xml version="1.0" ?>

<!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor
  license agreements. See the NOTICE file distributed with this work for additional
  information regarding copyright ownership. The ASF licenses this file to
  You under the Apache License, Version 2.0 (the "License"); you may not use
  this file except in compliance with the License. You may obtain a copy of
  the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS