12 | * - Local runner uses getExampleEvent() method to find the example event that you use during your events.
13 | *
14 | * @param
17 | * - It configures automatically Spring IoC. To enable this support Concrete handler classes extends this class with T type
18 | * which should implement @Configuration interface.
19 | * @see MainHandler
20 | *
21 | *
22 | * Every lambda handler class should extend this abstract base class and normally you do not touch this class
23 | */
24 | @SuppressWarnings("unused")
25 | public abstract class AbstractHandler
36 | * Event json that lambda function got is automatically serialized to this POJO. For more details see Lambda documentation:
37 | *
38 | * @link http://docs.aws.amazon.com/lambda/latest/dg/java-handler-io-type-pojo.html
39 | */
40 | public static class Request {
41 | String firstName;
42 | String lastName;
43 |
44 | public String getFirstName() {
45 | return firstName;
46 | }
47 |
48 | public void setFirstName(String firstName) {
49 | this.firstName = firstName;
50 | }
51 |
52 | public String getLastName() {
53 | return lastName;
54 | }
55 |
56 | public void setLastName(String lastName) {
57 | this.lastName = lastName;
58 | }
59 |
60 | public Request(String firstName, String lastName) {
61 | this.firstName = firstName;
62 | this.lastName = lastName;
63 | }
64 |
65 | public Request() {
66 | }
67 | }
68 |
69 | /**
70 | * Response is also a POJO that will handler return and
71 | * Lambda runtime automatically serializes it to JSON. Again see the documentation.
72 | *
73 | * @link http://docs.aws.amazon.com/lambda/latest/dg/java-handler-io-type-pojo.html
74 | */
75 | public static class Response {
76 | String greetings;
77 |
78 | public String getGreetings() {
79 | return greetings;
80 | }
81 |
82 | public void setGreetings(String greetings) {
83 | this.greetings = greetings;
84 | }
85 |
86 | public Response(String greetings) {
87 | this.greetings = greetings;
88 | }
89 |
90 | public Response() {
91 | }
92 |
93 | }
94 |
95 |
96 | /**
97 | * Main handler method is invoked when Lambda function is invoked. You should configure the name of this method in the AWS Console.
98 | * In this example, the value would be com.cagataygurturk.lambda.MainHandler. As we implement RequestHandler interface Lambda runtime
99 | * detects this method automatically and invokes it.
100 | *
101 | *
102 | *
103 | * As a best practice, this method should be kept very short and all the business logic should sit
104 | * in "Service" instance that we will fetch from Spring IoC container and will enjoy from all
105 | * Spring IoC features.
106 | *
107 | * Lambda specific code ends here and beginning from this point old good JAVA starts.
108 | *
109 | * @param request Request object
110 | * @param context Context object
111 | * @return Response
112 | * @throws RuntimeException
113 | * @see RequestHandler
114 | */
115 | public Response handleRequest(Request request, Context context)
116 | throws RuntimeException {
117 |
118 | /**
119 | * BusinessService is where all our business logic sits.
120 | */
121 | Service businessService = getApplicationContext().getBean(Service.class);
122 | return new Response(businessService.getText(request.getFirstName() + " " + request.getLastName()));
123 | }
124 | }
125 |
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/src/main/java/com/cagataygurturk/example/services/AnotherService.java:
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1 | package com.cagataygurturk.example.services;
2 |
3 | import org.springframework.stereotype.Component;
4 |
5 | @Component
6 | public class AnotherService {
7 |
8 | public String getText(String text) {
9 | return "Hi " + text;
10 | }
11 | }
12 |
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/src/main/java/com/cagataygurturk/example/services/Service.java:
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1 | package com.cagataygurturk.example.services;
2 |
3 | import org.springframework.beans.factory.annotation.Autowired;
4 | import org.springframework.stereotype.Component;
5 |
6 | @Component
7 | public class Service {
8 |
9 | /**
10 | * Autowiring another Spring Bean
11 | */
12 | @Autowired
13 | AnotherService anotherService;
14 |
15 | public String getText(String text) {
16 | return anotherService.getText(text);
17 | }
18 | }
19 |
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/src/main/java/com/example/config/SpringConfig.java:
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1 | package com.example.config;
2 |
3 | import org.springframework.context.annotation.ComponentScan;
4 | import org.springframework.context.annotation.Configuration;
5 |
6 |
7 | @Configuration
8 | @ComponentScan("com.example")
9 | public class SpringConfig {
10 |
11 | }
12 |
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/src/main/java/com/example/lambda/AbstractHandler.java:
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1 | package com.example.lambda;
2 |
3 | import org.springframework.context.ApplicationContext;
4 | import org.springframework.context.annotation.AnnotationConfigApplicationContext;
5 | import org.springframework.context.annotation.Configuration;
6 |
7 | import java.lang.reflect.ParameterizedType;
8 |
9 | /**
10 | * Every lambda handler class should extend this abstract base class
11 | *
12 | * T type parameter is used to determine the Spring @Configuration class, thus T should be a class that declares @Configuration annotation. Otherwise, an exception is thrown.
13 | *
14 | * @param
92 | * As a best practice, this method should be kept very short and all the business logic should sit
93 | * in "Service" instance that we will fetch from Spring IoC container and will enjoy from all
94 | * Spring IoC features.
95 | *
96 | * Lambda specific code ends here and beginning from this point old good JAVA starts.
97 | *
98 | * @param request
99 | * @param context
100 | * @return Response
101 | * @throws RuntimeException
102 | */
103 | public Response handleRequest(Request request, Context context)
104 | throws RuntimeException {
105 |
106 | Service businessService = getApplicationContext().getBean(Service.class);
107 | return new Response(businessService.getText(request.getFirstName() + " " + request.getLastName()));
108 | }
109 | }
110 |
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/src/main/java/com/example/services/AnotherService.java:
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1 | package com.example.services;
2 |
3 | import org.springframework.stereotype.Component;
4 |
5 | @Component
6 | public class AnotherService {
7 |
8 | public String getText(String text) {
9 | return "Hi " + text;
10 | }
11 | }
12 |
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/src/main/java/com/example/services/Service.java:
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1 | package com.example.services;
2 |
3 | import org.springframework.beans.factory.annotation.Autowired;
4 | import org.springframework.stereotype.Component;
5 |
6 | @Component
7 | public class Service {
8 |
9 | @Autowired
10 | AnotherService service2;
11 |
12 | public String getText(String text) {
13 | return service2.getText(text);
14 | }
15 | }
16 |
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/src/main/resources/log4j.properties:
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1 | log = .
2 | log4j.rootLogger = DEBUG, LAMBDA
3 |
4 | #Define the LAMBDA appender
5 | log4j.appender.LAMBDA=com.amazonaws.services.lambda.runtime.log4j.LambdaAppender
6 | log4j.appender.LAMBDA.layout=org.apache.log4j.PatternLayout
7 | log4j.appender.LAMBDA.layout.conversionPattern=%d{yyyy-MM-dd HH:mm:ss} <%X{AWSRequestId}> %-5p %c{1}:%L - %m%n
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/tests/com/cagataygurturk/example/services/ServiceTest.java:
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1 | package com.cagataygurturk.example.services;
2 |
3 | import org.junit.Test;
4 |
5 | import static org.junit.Assert.*;
6 |
7 |
8 | public class ServiceTest {
9 | @Test
10 | public void CreateTest() {
11 | Service service = new Service();
12 | assertTrue(true);
13 | }
14 | }
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