Enable caching to avoid hitting github's rate limit

build.gradle

@@ -37,11 +37,13 @@ dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-web'
 	implementation 'org.springframework.boot:spring-boot-starter-webflux'
 	implementation 'org.springframework.boot:spring-boot-starter-validation'
+	implementation 'org.springframework.boot:spring-boot-starter-cache'
 	implementation 'org.springframework.boot:spring-boot-starter-oauth2-resource-server'
 	implementation 'org.springframework.boot:spring-boot-starter-hateoas'
 	implementation 'org.springframework.boot:spring-boot-starter-graphql'
 	implementation 'com.azure.spring:spring-cloud-azure-starter-keyvault-secrets'
 	implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310'
+	implementation 'com.github.ben-manes.caffeine:caffeine'
 	implementation 'com.vladsch.flexmark:flexmark-all:0.64.8'
 	implementation 'org.apache.maven:maven-artifact:3.6.3'
 	testImplementation 'com.squareup.okhttp3:mockwebserver'

src/main/java/io/spring/projectapi/Application.java

@@ -24,9 +24,11 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.context.annotation.Bean;
 
 @SpringBootApplication
+@EnableCaching
 @EnableConfigurationProperties(ApplicationProperties.class)
 public class Application {
 

src/main/java/io/spring/projectapi/github/GithubOperations.java

@@ -37,6 +37,7 @@
 import org.jetbrains.annotations.NotNull;
 
 import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.cache.annotation.Cacheable;
 import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.http.HttpStatusCode;
 import org.springframework.http.MediaType;
@@ -94,6 +95,7 @@ private static int compare(ProjectDocumentation o1, ProjectDocumentation o2) {
 		return -version1.compareTo(version2);
 	}
 
+	@Cacheable(value = "documentation", key = "#projectSlug")
 	public List<ProjectDocumentation> getProjectDocumentations(String projectSlug) {
 		ResponseEntity<Map<String, Object>> response = getFile(projectSlug, "documentation.json");
 		String content = getFileContents(response);
@@ -250,6 +252,7 @@ private String getFileSha(ResponseEntity<Map<String, Object>> exchange) {
 		return (String) exchange.getBody().get("sha");
 	}
 
+	@Cacheable("projects")
 	public List<Project> getProjects() {
 		List<Project> projects = new ArrayList<>();
 		try {
@@ -274,6 +277,7 @@ public List<Project> getProjects() {
 		return projects;
 	}
 
+	@Cacheable(value = "project", key = "#projectSlug")
 	public Project getProject(String projectSlug) {
 		ResponseEntity<Map<String, Object>> response = getFile(projectSlug, "index.md");
 		String contents = getFileContents(response);
@@ -283,6 +287,7 @@ public Project getProject(String projectSlug) {
 		return this.objectMapper.convertValue(frontMatter, Project.class);
 	}
 
+	@Cacheable(value = "support", key = "#projectSlug")
 	public List<ProjectSupport> getProjectSupports(String projectSlug) {
 		ResponseEntity<Map<String, Object>> response = getFile(projectSlug, "support.json");
 		if (response == null) {
@@ -299,6 +304,7 @@ public List<ProjectSupport> getProjectSupports(String projectSlug) {
 		}
 	}
 
+	@Cacheable(value = "support_policy", key = "#projectSlug")
 	public String getProjectSupportPolicy(String projectSlug) {
 		ResponseEntity<Map<String, Object>> indexResponse = getFile(projectSlug, "index.md");
 		String indexContents = getFileContents(indexResponse);

src/main/resources/application.properties

@@ -5,3 +5,6 @@ projects.github.org: spring-io
 projects.github.team: spring-team
 projects.github.accesstoken: ${projects-github-accessToken}
 
+spring.cache.cache-names=projects,project,support,support_policy,documentation
+spring.cache.caffeine.spec=maximumSize=500,expireAfterAccess=1800s
+