Add config caching in PxWebDriver

Author: charphi

CHANGELOG.md

@@ -10,14 +10,15 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 ### Added
 
 - ![SOURCE] Add source from Swiss Federal Statistical Office [#1132](https://github.com/nbbrd/sdmx-dl/issues/1132)
+- ![PROVIDER] Add config caching in PxWebDriver
 - ![GRPC] Add simple web page to query rest web service
 - ![CLI] Add option to set system properties from command-line
 - ![CLI] Add experimental list upptime command
 
 ### Fixed
 
 - ![SOURCE] Update NBB source [#1133](https://github.com/nbbrd/sdmx-dl/issues/1133)
-- ![SOURCE] Fix source links in PxWebDriver
+- ![PROVIDER] Fix source links in PxWebDriver
 - ![GRPC] Fix aliases when listing sources
 
 ## [3.0.0-beta.16] - 2025-11-13

sdmx-dl-provider-px/src/main/java/sdmxdl/provider/px/drivers/PxWebDriver.java

@@ -389,6 +389,9 @@ private static final class CachedPxWebClient implements PxWebClient {
         @lombok.NonNull
         private final Duration ttl;
 
+        @lombok.Getter(lazy = true)
+        private final TypedId<Config> idOfConfig = initIdOfConfig(baseURI);
+
         @lombok.Getter(lazy = true)
         private final TypedId<List<sdmxdl.Database>> idOfDatabases = initIdOfDatabases(baseURI);
 
@@ -398,6 +401,13 @@ private static final class CachedPxWebClient implements PxWebClient {
         @lombok.Getter(lazy = true)
         private final TypedId<Structure> idOfMeta = initIdOfMeta(baseURI);
 
+        private static TypedId<Config> initIdOfConfig(URI base) {
+            return TypedId.of(base,
+                    repo -> Config.JSON_PARSER.asParser().parse(repo.getName()),
+                    config -> DataRepository.builder().name(Config.JSON_FORMATTER.asFormatter().formatValueAsString(config).orElse("")).build()
+            ).with("config");
+        }
+
         private static TypedId<List<sdmxdl.Database>> initIdOfDatabases(URI base) {
             return TypedId.of(base,
                     DataRepository::getDatabases,
@@ -431,7 +441,8 @@ private static TypedId<Structure> initIdOfMeta(URI base) {
 
         @Override
         public @NonNull Config getConfig() throws IOException {
-            return delegate.getConfig();
+            return getIdOfConfig()
+                    .load(cache, delegate::getConfig, ignore -> ttl);
         }
 
         @Override
@@ -613,6 +624,21 @@ static Config deserialize(JsonElement json, Type typeOfT, JsonDeserializationCon
                     x.get("timeWindow").getAsInt()
             );
         }
+
+        static final TextFormatter<Config> JSON_FORMATTER = GsonIO.GsonFormatter
+                .builder(Config.class)
+                .serializer(Config.class, Config::serialize)
+                .build();
+
+        @MightBeGenerated
+        static JsonElement serialize(Config src, Type typeOfSrc, JsonSerializationContext context) {
+            JsonObject result = new JsonObject();
+            result.addProperty("maxValues", src.maxValues);
+            result.addProperty("maxCells", src.maxCells);
+            result.addProperty("maxCalls", src.maxCalls);
+            result.addProperty("timeWindow", src.timeWindow);
+            return result;
+        }
     }
 
     @VisibleForTesting

sdmx-dl-provider-px/src/test/java/sdmxdl/provider/px/drivers/PxWebDriverTest.java

@@ -28,8 +28,13 @@ public void testCompliance() {
 
     @Test
     public void testConfig() throws IOException {
+        Config sample = new Config(120000, 120012, 30, 10);
+
         assertThat(PxWebDriver.Config.JSON_PARSER.parseResource(PxWebDriverTest.class, "statfin-config.json", UTF_8))
-                .isEqualTo(new PxWebDriver.Config(120000, 120000, 30, 10));
+                .isEqualTo(sample);
+
+        assertThat(Config.JSON_PARSER.parseChars(PxWebDriver.Config.JSON_FORMATTER.formatToString(sample)))
+                .isEqualTo(sample);
     }
 
     @Test

sdmx-dl-provider-px/src/test/resources/sdmxdl/provider/px/drivers/statfin-config.json

@@ -1,6 +1,6 @@
 {
   "maxValues": 120000,
-  "maxCells": 120000,
+  "maxCells": 120012,
   "maxCalls": 30,
   "timeWindow": 10,
   "CORS": true