заготовки для зеркалирования Maven Central

src/main/java/ru/di9/mirror/controller/IndexOfMavenController.java

@@ -1,5 +1,6 @@
 package ru.di9.mirror.controller;
 
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.core.io.InputStreamResource;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
@@ -24,7 +25,7 @@ import java.util.Optional;
 public class IndexOfMavenController {
     private final StorageService storageService;
 
-    public IndexOfMavenController(StorageService storageService) {
+    public IndexOfMavenController(@Qualifier("mirroredStorageService") StorageService storageService) {
         this.storageService = storageService;
     }
 

src/main/java/ru/di9/mirror/controller/MavenController.java

@@ -1,6 +1,7 @@
 package ru.di9.mirror.controller;
 
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.core.io.InputStreamResource;
 import org.springframework.core.io.Resource;
 import org.springframework.http.HttpHeaders;
@@ -25,7 +26,7 @@ import java.util.Optional;
 public class MavenController {
     private final StorageService storageService;
 
-    public MavenController(StorageService storageService) {
+    public MavenController(@Qualifier("mirroredStorageService") StorageService storageService) {
         this.storageService = storageService;
     }
 

src/main/java/ru/di9/mirror/services/MavenCentralStorageService.java

@@ -0,0 +1,26 @@
+package ru.di9.mirror.services;
+
+import org.springframework.stereotype.Service;
+import ru.di9.mirror.domain.FileRecord;
+import ru.di9.mirror.domain.WalkerResult;
+
+import java.io.InputStream;
+import java.util.Optional;
+
+@Service
+public class MavenCentralStorageService implements StorageService {
+    @Override
+    public Optional<FileRecord> getFile(String path) {
+        return Optional.empty();
+    }
+
+    @Override
+    public void putFile(String path, InputStream inputStream) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Optional<WalkerResult> walker(String path) {
+        throw new UnsupportedOperationException();
+    }
+}

src/main/java/ru/di9/mirror/services/MirroredStorageService.java

@@ -0,0 +1,47 @@
+package ru.di9.mirror.services;
+
+import org.springframework.stereotype.Service;
+import ru.di9.mirror.domain.FileRecord;
+import ru.di9.mirror.domain.WalkerResult;
+
+import java.io.InputStream;
+import java.util.Optional;
+
+@Service
+public class MirroredStorageService implements StorageService {
+
+    private final FileStorageService fileStorageService;
+    private final MavenCentralStorageService mavenCentralStorageService;
+
+    public MirroredStorageService(FileStorageService fileStorageService,
+                                  MavenCentralStorageService mavenCentralStorageService) {
+        this.fileStorageService = fileStorageService;
+        this.mavenCentralStorageService = mavenCentralStorageService;
+    }
+
+    @Override
+    public Optional<FileRecord> getFile(String path) {
+        Optional<FileRecord> optional;
+
+        optional = fileStorageService.getFile(path);
+        if (optional.isPresent()) {
+            return optional;
+        }
+
+        mavenCentralStorageService.getFile(path).ifPresent(fileRecord ->
+                fileStorageService.putFile(fileRecord.name(), fileRecord.inputStream()));
+
+
+        return fileStorageService.getFile(path);
+    }
+
+    @Override
+    public void putFile(String path, InputStream inputStream) {
+        fileStorageService.putFile(path, inputStream);
+    }
+
+    @Override
+    public Optional<WalkerResult> walker(String path) {
+        return fileStorageService.walker(path);
+    }
+}