Initial commit

src/main/java/io/discdrop/service/FeedService.java

@@ -0,0 +1,40 @@
+package io.discdrop.service;
+
+import io.discdrop.persistence.ReleaseGroupEntity;
+import io.quarkus.hibernate.orm.panache.PanacheQuery;
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.transaction.Transactional;
+import org.eclipse.microprofile.config.inject.ConfigProperty;
+
+import java.util.List;
+
+@ApplicationScoped
+public class FeedService {
+
+    @ConfigProperty(name = "discdrop.feed.page-size", defaultValue = "25")
+    int pageSize;
+
+    private static final String ORDER_HQL =
+            "ORDER BY firstReleaseDate DESC NULLS LAST, discoveredAt DESC";
+
+    private PanacheQuery<ReleaseGroupEntity> orderedQuery() {
+        return ReleaseGroupEntity.find(ORDER_HQL);
+    }
+
+    @Transactional
+    public List<ReleaseGroupEntity> feedPage(int offset) {
+        if (offset < 0) {
+            offset = 0;
+        }
+        return orderedQuery().range(offset, offset + pageSize - 1).list();
+    }
+
+    @Transactional
+    public List<ReleaseGroupEntity> latest(int count) {
+        return orderedQuery().range(0, Math.max(0, count - 1)).list();
+    }
+
+    public int pageSize() {
+        return pageSize;
+    }
+}