Diabolical Developer s Intro to FaaS for Java Developers

Transcription

1 Diabolical Developer s Intro to FaaS for Java Developers

2 Community Leader Devs+502 & JDuchess Chapter Guatemala Ex-JUG Member Guatemala Java Users Group (GuateJUG) Chief Technology Officer (CTO) at Produactivity Full Stack Developer Mercedes Wyss Auth0 Ambassador & Oracle Groundbreaker

3 Spoiler alert: Santa Claus and the Easter Bunny also do not exist Storj Labs courtesy

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6 Serverless Functions as the unit of scale Run in ephemeral containers We can focus just on developing

7 Serverless No server management High availability Flexible Scaling Pay as you go

8 Function as a Service Serverlees computing vs Serverless Architecture Deploy an individual function, action, or piece of business logic. Event-driven processing part of the serverless architecture.

9 FaaS Facts Are stateless (Provide pure functional transformations of their input.) FaaS functions are typically limited in how long each invocation is allowed to run. Programming languages to use. Availability and Scalability

10 FaaS in the Cloud Serverlees is a cloud solution. Deploy an individual function, action, or piece of business logicrun code without provisioning or managing servers. Zero administration. Just upload the code, and we will run and Scale.

11 Serverless is a Software Architecture

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16 Serverless Use Cases

17 Data Processing

18 Internet of Things

19 Chatbots

20 Backend Applications

21 Benefits and Drawbacks

22 Benefits Time to market improvement Reduced operational and infrastructure cost Easier operational management

23 Drawbacks Problems due to Third-party API system Architecture complexity Implementation and monitoring challenges

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25 Java Serverless

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27 Maven Dependencies <dependency> <groupid>com.amazonaws</groupid> <artifactid>aws-lambda-java-core</artifactid> <version>1.1.0</version> </dependency>

28 Maven Shared Pluggin <plugin> <groupid>org.apache.maven.plugins</groupid> <artifactid>maven-shade-plugin</artifactid> <version>2.4.3</version> <configuration> <createdependencyreducedpom>false</createdependencyreducedpom> </configuration> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> </execution> </executions> </plugin>

29 Create Handler Creating a custom MethodHandler Implementing the RequestHandler interface Implementing the RequestStreamHandler interface

30 Custom MethodHandler public class LambdaMethodHandler { public String handlerequest(string input, Context context) { context.getlogger().log("input: " + input); return "Hello World - " + input;

31 RequestHandler Interface public class LambdaRequestHandler implements RequestHandler<String, String> { public String handlerequest(string input, Context context) { context.getlogger().log("input: " + input); return "Hello World - " + input;

32 RequestStreamHandler Interface public class LambdaRequestStreamHandler implements RequestStreamHandler { public void handlerequest(inputstream inputstream, OutputStream outputstream, Context context) { String input = IOUtils.toString(inputStream, "UTF-8"); outputstream.write(("hello World - " + input).getbytes());

33 Handler Input/Output: POJO Type public class HelloPojo { // Define two classes/pojos for use with Lambda function. public static class RequestClass {... public static class ResponseClass {... public static ResponseClass myhandler(requestclass request, Context context) { String greetingstring = String.format("Hello %s, %s.", request.getfirstname(), request.getlastname()); return new ResponseClass(greetingString);

34 Example: Using POJOs for Handler Input/Output

35 Input { "firstname": "John", "lastname": "Doe" public static ResponseClass handlerequest(requestclass request, Context context){ String greetingstring = String.format("Hello %s, %s.", request.firstname, request.lastname); return new ResponseClass(greetingString);

36 RequestStreamHandler Interface package example; import com.amazonaws.services.lambda.runtime.context; import com.amazonaws.services.lambda.runtime.requesthandler; public class HelloPojo implements RequestHandler<RequestClass, ResponseClass>{ public ResponseClass handlerequest(requestclass request, Context context){ String greetingstring = String.format("Hello %s, %s.", request.firstname, request.lastname); return new ResponseClass(greetingString);

37 package example; public class RequestClass { String firstname; String lastname; Request Class public String getfirstname() { return firstname; public void setfirstname(string firstname) { this.firstname = firstname; public String getlastname() { return lastname; public void setlastname(string lastname) { this.lastname = lastname; public RequestClass(String firstname, String lastname) { this.firstname = firstname; this.lastname = lastname; public RequestClass() {

38 Response Class package example; public class ResponseClass { String greetings; public String getgreetings() { return greetings; public void setgreetings(string greetings) { this.greetings = greetings; public ResponseClass(String greetings) { this.greetings = greetings; public ResponseClass() {

39 Launching our Function aws lambda create-function \ --region region \ --function-name getting-started-lambda-function-in-java \ --zip-file fileb://deployment-package (zip or jar) path \ --role arn:aws:iam::account-id:role/lambda_basic_execution \ --handler example.hello \ --runtime java8 \ --timeout 15 \ --memory-size 512

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41 Generating Func Project # Linux / Mac OS mvn archetype:generate \ -DarchetypeGroupId=com.microsoft.azure \ -DarchetypeArtifactId=azure-functions-archetype # Windows mvn archetype:generate ^ -DarchetypeGroupId=com.microsoft.azure ^ -DarchetypeArtifactId=azure-functions-archetype

42 Run Func Locally cd fabrikam-functions mvn clean package mvn azure-functions:run # Output Listening on Hit CTRL-C to exit... Http Functions: HttpTrigger-Java:

43 Generating Func Project # Trigger Function curl -w '\n' -d LocalFunctionTest # Output Hello, LocalFunctionTest

44 Deploy to Azure # Deploy to Azure mvn azure-functions:deploy # Output [INFO] Successfully deployed Function App with package. [INFO] Deleting deployment package from Azure Storage... [INFO] Successfully deleted deployment package fabrikamfunction zip [INFO] Successfully deployed Function App at [INFO]

45 Project Structure

46 Annotations public class Function { public String echo(@httptrigger(name = "req", methods = {"post", authlevel = AuthorizationLevel.ANONYMOUS) String req, ExecutionContext context) { return String.format(req);

47 JSON Function config { "scriptfile": "azure-functions-example.jar", "entrypoint": "com.example.myclass.echo", "bindings": [ { "type": "httptrigger", "name": "req", "direction": "in", "authlevel": "anonymous", "methods": [ "post" ], { "type": "http", "name": "$return", "direction": "out" ]

48 Input Overloading public class MyClass public static String = "req", methods = { "put", authlevel = AuthorizationLevel.ANONYMOUS, route = "items/{id") String = "item", tablename = "items", partitionkey = "Example", rowkey = "{id", connection = "AzureWebJobsStorage") MyObject obj ) { return "Hello, " + in + " and " + obj.getkey() + "."; public static class MyObject { public String getkey() { return this.rowkey; private String RowKey;

49 Output Overloading package com.example; import com.microsoft.azure.functions.annotation.*; public class @BlobOutput(name = "$return", path = "samples-output-java/{name") public static String copy(@blobtrigger(name = "blob", path = "samples-input-java/{name") String content) { return content;

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51 FNProject Fn Load Balancer Fn Server (FaaS) Fn FDK s Fn Flow (not working)

52 package com.example.fn; public class HelloFunction { public String handlerequest(string input) { String name = (input == null input.isempty())? "world" : input; return "Hello, " + name + "!";

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