Bael 4398 retrofit dynamic url (#10090)

* BAEL-2495 fixing InvalidDefinitionException

* BAEL-2495 minor changes

* Added solution for dynamic Urls using retrofit 2.

* Revert "BAEL-2495 minor changes"

This reverts commit 174d8664e2612d9d578c72b33571b61dc3a27dbf.

* Revert "BAEL-2495 fixing InvalidDefinitionException"

This reverts commit 20e1b768e6c50529cb0af250ca437b94a9f01cd9.

* BAEL-4398 moved repository to libraries-http-2

libraries-http-2/pom.xml

@@ -66,6 +66,18 @@
             <artifactId>reactive-streams</artifactId>
             <version>${reactive.stream.version}</version>
         </dependency>
+
+        <!-- Retrofit -->
+        <dependency>
+            <groupId>com.squareup.retrofit2</groupId>
+            <artifactId>retrofit</artifactId>
+            <version>${retrofit.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.squareup.retrofit2</groupId>
+            <artifactId>converter-gson</artifactId>
+            <version>${retrofit.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>
@@ -76,6 +88,7 @@
         <jetty.httpclient.version>1.0.3</jetty.httpclient.version>
         <jetty.server.version>9.4.19.v20190610</jetty.server.version>
         <rxjava2.version>2.2.11</rxjava2.version>
+        <retrofit.version>2.3.0</retrofit.version>
         <spring.webflux.version>5.1.9.RELEASE</spring.webflux.version>
         <reactive.stream.version>1.0.3</reactive.stream.version>
         <reactor.version>3.2.12.RELEASE</reactor.version>

libraries-http-2/src/main/java/com/baeldung/retrofit/dynamic/GitHubDynamicApi.java

@@ -0,0 +1,19 @@
+package com.baeldung.retrofit.dynamic;
+
+import com.baeldung.retrofit.models.Contributor;
+import com.baeldung.retrofit.models.Repository;
+import retrofit2.Call;
+import retrofit2.http.GET;
+import retrofit2.http.Path;
+import retrofit2.http.Url;
+
+import java.util.List;
+
+public interface GitHubDynamicApi {
+
+    @GET
+    Call<List<Repository>> reposList(@Url String url);
+
+    @GET("{fullUrl}")
+    Call<List<Contributor>> contributorsList(@Path(value = "fullUrl", encoded = true) String fullUrl);
+}

libraries-http-2/src/main/java/com/baeldung/retrofit/dynamic/GitHubDynamicApiApp.java

@@ -0,0 +1,13 @@
+package com.baeldung.retrofit.dynamic;
+
+import java.io.IOException;
+import java.util.List;
+
+public class GitHubDynamicApiApp {
+
+    public static void main(String[] args) throws IOException {
+        String url = "https://api.github.com/users/eugenp/repos";
+        List<String> topContributors = new GitHubDynamicApiService().getTopContributors(url);
+        topContributors.forEach(System.out::println);
+    }
+}

libraries-http-2/src/main/java/com/baeldung/retrofit/dynamic/GitHubDynamicApiService.java

@@ -0,0 +1,44 @@
+package com.baeldung.retrofit.dynamic;
+
+import com.baeldung.retrofit.models.Contributor;
+import com.baeldung.retrofit.models.Repository;
+import retrofit2.Retrofit;
+import retrofit2.converter.gson.GsonConverterFactory;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+class GitHubDynamicApiService {
+
+    private GitHubDynamicApi gitHubDynamicApi;
+
+    GitHubDynamicApiService() {
+        Retrofit retrofit = new Retrofit.Builder().baseUrl("https://api.github.com/").addConverterFactory(GsonConverterFactory.create()).build();
+
+        gitHubDynamicApi = retrofit.create(GitHubDynamicApi.class);
+    }
+
+    List<String> getTopContributors(String url) throws IOException {
+        List<Repository> repos = gitHubDynamicApi.reposList(url).execute().body();
+
+        repos = repos != null ? repos : Collections.emptyList();
+
+        return repos.stream().flatMap(repo -> getContributors("repos/eugenp/"+repo+"/contributors")).sorted((a, b) -> b.getContributions() - a.getContributions()).map(com.baeldung.retrofit.models.Contributor::getName).distinct().sorted().collect(Collectors.toList());
+    }
+
+    private Stream<Contributor> getContributors(String fullUrl) {
+        List<Contributor> contributors = null;
+        try {
+            contributors = gitHubDynamicApi.contributorsList(fullUrl).execute().body();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        contributors = contributors != null ? contributors : Collections.emptyList();
+
+        return contributors.stream().filter(c -> c.getContributions() > 100);
+    }
+}

libraries-http-2/src/main/java/com/baeldung/retrofit/models/Contributor.java

@@ -0,0 +1,33 @@
+package com.baeldung.retrofit.models;
+
+import com.google.gson.annotations.SerializedName;
+
+public class Contributor {
+
+    @SerializedName("login")
+    private String name;
+
+    private Integer contributions;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getContributions() {
+        return contributions;
+    }
+
+    public void setContributions(Integer contributions) {
+        this.contributions = contributions;
+    }
+
+    @Override
+    public String toString() {
+        return "Contributer [name=" + name + ", contributions=" + contributions + "]";
+    }
+
+}

libraries-http-2/src/main/java/com/baeldung/retrofit/models/Repository.java

@@ -0,0 +1,30 @@
+package com.baeldung.retrofit.models;
+
+public class Repository {
+
+    private String name;
+
+    private String description;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    @Override
+    public String toString() {
+        return "Repository [name=" + name + ", description=" + description + "]";
+    }
+
+}