add hydra jobs

build.gradle

@@ -9,3 +9,27 @@ plugins {
 task clean(type: Delete) {
     delete rootProject.buildDir
 }
+
+task resolveDependencies {
+  doLast {
+    project.rootProject.allprojects.each { subProject ->
+      subProject.buildscript.configurations.each { configuration ->
+        resolveConfiguration(subProject, configuration, "buildscript config '${configuration.name}'")
+      }
+      subProject.configurations.each { configuration ->
+        resolveConfiguration(subProject, configuration, "config '${configuration.name}'")
+      }
+    }
+  }
+}
+
+void resolveConfiguration(subProject, configuration, name) {
+  // TODO: fix this
+  if (subProject.name == "app") {
+    return;
+  }
+  if (configuration.canBeResolved) {
+    logger.info("Resolving project {} {}", subProject.name, name)
+    configuration.resolve()
+  }
+}

flake.nix

@@ -19,7 +19,7 @@
           allowUnfree = true;
         };
       };
-    in {
+    in rec {
       formatter = pkgs.alejandra;
       devShells.default = let
         androidSdk = pkgs.androidenv.androidPkgs_9_0.androidsdk;
@@ -35,5 +35,47 @@
           # override the aapt2 that gradle uses with the nix-shipped version
           GRADLE_OPTS = "-Dorg.gradle.project.android.aapt2FromMavenOverride=${androidSdk}/libexec/android-sdk/build-tools/32.0.0/aapt2";
         };
+      packages = rec {
+        invtracker-deps = pkgs.stdenv.mkDerivation {
+          pname = "invtracker-deps";
+          version = self.lastModifiedDate;
+          src = self;
+          nativeBuildInputs = with pkgs; [gradle openjdk_headless perl];
+          buildPhase = ''
+            export GRADLE_USER_HOME=$(mktemp -d)
+            # Fetch the maven deps
+            gradle --no-daemon --info -Dorg.gradle.java.home=${pkgs.openjdk_headless} resolveDependencies
+          '';
+          installPhase = ''
+            find $GRADLE_USER_HOME/caches/modules-2 -type f -regex '.*\.\(jar\|pom\)$' \
+              | perl -pe 's#(.*/([^/]+)/([^/]+)/([^/]+)/[0-9a-f]{30,40}/([^/\s]+))$# ($x = $2) =~ tr|\.|/|; "install -Dm444 $1 \$out/maven/$x/$3/$4/$5" #e' \
+              | sh
+          '';
+          outputHashAlgo = "sha256";
+          outputHashMode = "recursive";
+          outputHash = "sha256-OXNB19WPC5MyLEoDAtnVM9XykY7e0mKGRH5Aw8C/lMo=";
+        };
+        invtracker-server = pkgs.stdenv.mkDerivation {
+          pname = "invtracker-server";
+          version = self.lastModifiedDate;
+          src = self;
+          nativeBuildInputs = with pkgs; [gradle openjdk_headless];
+          buildPhase = ''
+            sed -i 's#gradlePluginPortal..#maven { url "${invtracker-deps}/maven" }#' settings.gradle
+            sed -i 's#google..#maven { url "${invtracker-deps}/maven" }#' settings.gradle
+
+            export GRADLE_USER_HOME=$(mktemp -d)
+            gradle --offline --no-daemon --info -Dorg.gradle.java.home=${pkgs.openjdk_headless} server:installDist
+          '';
+          installPhase = ''
+            cp -rv server/build/install/server $out/
+          '';
+        };
+      };
+
+      hydraJobs =
+        if system == "x86_64-linux"
+        then devShells // packages
+        else {};
     });
 }

server/src/main/java/rs/chir/invtracker/server/db/LocationLogTable.java

@@ -25,18 +25,48 @@ import rs.chir.db.DBConnection;
 import rs.chir.invtracker.model.Cursor;
 import rs.chir.invtracker.model.GeoLocation;
 
+/**
+ * A table for storing locations for tracked items.
+ */
 public class LocationLogTable implements Map<Long, GeoLocation> {
+    /**
+     * The page size to use for API cursors
+     */
     private static final int PAGE_SIZE = 50;
+    /**
+     * The database connection to use for accessing the table.
+     */
     private final DBConnection dbConnection;
+    /**
+     * The user ID to use for accessing the table.
+     */
     private final long userId;
+    /**
+     * The item ID to use for accessing the table.
+     */
     private final long itemId;
 
+    /**
+     * Creates a new table.
+     *
+     * @param dbConnection the database connection to use for accessing the table.
+     * @param userId the user ID to use for accessing the table.
+     * @param itemId the item ID to use for accessing the table.
+     */
     private LocationLogTable(DBConnection dbConnection, long userId, long itemId) {
         this.dbConnection = dbConnection;
         this.userId = userId;
         this.itemId = itemId;
     }
 
+    /**
+     * Retrieve the table for the given user and item.
+     *
+     * @param dbConnection the database connection to use for accessing the table.
+     * @param userId the user ID to use for accessing the table.
+     * @param itemId the item ID to use for accessing the table.
+     * @return the new table.
+     */
     @NonNull
     public static LocationLogTable getInstance(@NonNull DBConnection dbConnection, long userId, long itemId) {
         // TODO: add caching maybe
@@ -45,6 +75,12 @@ public class LocationLogTable implements Map<Long, GeoLocation> {
         return result;
     }
 
+    /**
+     * Converts a row from the database to a location.
+     * @param resultSet the result set to convert.
+     * @return the location.
+     * @throws SQLException if an error occurs.
+     */
     @NonNull
     @Contract("_ -> new")
     private static GeoLocation fromResultSet(@NonNull ResultSet rs) throws SQLException {