Dev

.gitignore

@@ -1,24 +1,13 @@
-# Compiled class file
-*.class
-
-# Log file
-*.log
-
-# BlueJ files
-*.ctxt
-
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
-
-# Package Files #
-*.jar
-*.war
-*.nar
-*.ear
-*.zip
-*.tar.gz
-*.rar
-
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
-replay_pid*
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr

pom.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>AsyncCourse</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.15.2</version>
+        </dependency>
+    </dependencies>
+
+</project>

src/main/java/Main.java

@@ -0,0 +1,122 @@
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+
+public class Main {
+    private final static HttpClient client = HttpClient.newHttpClient();
+    private final static ObjectMapper mapper = new ObjectMapper()
+            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+    private final static HttpResponse.BodyHandler<String> BODY_HANDLER = HttpResponse.BodyHandlers.ofString();
+
+    public static void main(String[] args) {
+        long time = System.currentTimeMillis();
+        User user = getUser();
+        System.out.println(user);
+        System.out.println(System.currentTimeMillis() - time);
+    }
+
+    public record User(String name, String email, List<Repo> repos) {
+        public User(@JsonProperty("login") String name, String email, List<Repo> repos) {
+            this.name = name;
+            this.email = email;
+            this.repos = repos == null ? new ArrayList<>() : repos;
+        }
+
+        public void addAllRepos(List<Repo> repos) {
+            this.repos.addAll(repos);
+        }
+    }
+
+    public record Repo(String name, String contributeUrl, List<String> contributeNames) {
+        public Repo(String name, @JsonProperty("contributors_url") String contributeUrl, List<String> contributeNames) {
+            this.name = name;
+            this.contributeUrl = contributeUrl;
+            this.contributeNames = contributeNames == null ? new ArrayList<>() : contributeNames;
+        }
+
+        public void addContributeNames(List<String> ctr) {
+            this.contributeNames.addAll(ctr);
+        }
+    }
+
+    record Contributor(@JsonProperty("login") String name) {
+    }
+
+    public static User getUser() {
+        HttpRequest requestClient = httpRequestGET("https://api.github.com/users/pivotal");
+        HttpRequest requestRepo = httpRequestGET("https://api.github.com/users/pivotal/repos");
+
+        CompletableFuture<List<Repo>> reposFuture = client.sendAsync(requestRepo, BODY_HANDLER)
+                .thenApply(HttpResponse::body)
+                .thenApply(Main::parseRepos)
+                .thenApply(repos -> {
+                            List<CompletableFuture<Void>> allFutures = new ArrayList<>();
+                            List<Repo> resultRepos = repos.stream().limit(10).toList();
+                            resultRepos.forEach(repo ->
+                                    allFutures.add(client.sendAsync(httpRequestGET(repo.contributeUrl), BODY_HANDLER)
+                                            .thenApply(HttpResponse::body)
+                                            .thenApply(Main::parseContributors)
+                                            .thenAccept(repo::addContributeNames)
+                                            .thenAccept(nothing -> System.out.println("contribute"))
+                                    ));
+                            CompletableFuture.allOf(allFutures.toArray(new CompletableFuture[0])).join();
+                            return resultRepos;
+                        }
+                );
+
+        return client.sendAsync(requestClient, HttpResponse.BodyHandlers.ofString())
+                .thenApply(HttpResponse::body)
+                .thenApply(Main::parseUser)
+                .thenCombine(reposFuture, (userF, reposF) -> {
+                    userF.addAllRepos(reposF);
+                    return userF;
+                })
+                .thenApply(f -> {
+                    System.out.println("user");
+                    return f;
+                }).join();
+    }
+
+    private static HttpRequest httpRequestGET(String url) {
+        return HttpRequest.newBuilder()
+                .uri(URI.create(url))
+                .GET()
+                .build();
+    }
+
+    private static List<Repo> parseRepos(String jsonString) {
+        try {
+            return Arrays.stream(mapper.readValue(jsonString, Repo[].class)).toList();
+        } catch (JsonProcessingException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static List<String> parseContributors(String jsonString) {
+        try {
+            return Arrays.stream(mapper.readValue(jsonString, Contributor[].class)).map(Contributor::name).toList();
+        } catch (JsonProcessingException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+
+    private static User parseUser(String jsonString) {
+        try {
+            return mapper.readValue(jsonString, User.class);
+        } catch (JsonProcessingException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}