Add search service skeleton

src/main/java/dev/migwel/sts/model/RadioSearchRequest.java

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+package dev.migwel.sts.model;
+
+public record RadioSearchRequest(String url) implements SearchRequest {}

src/main/java/dev/migwel/sts/model/SearchRequest.java

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+package dev.migwel.sts.model;
+
+public sealed interface SearchRequest permits SonosSearchRequest, RadioSearchRequest {}

src/main/java/dev/migwel/sts/model/Song.java

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+package dev.migwel.sts.model;
+
+public record Song(String artist, String title) {}

src/main/java/dev/migwel/sts/model/SonosSearchRequest.java

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+package dev.migwel.sts.model;
+
+public record SonosSearchRequest(String householdId, String groupId) implements SearchRequest {}

src/main/java/dev/migwel/sts/radio/RadioSearchService.java

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+package dev.migwel.sts.radio;
+
+import dev.migwel.sts.model.RadioSearchRequest;
+import dev.migwel.sts.model.Song;
+import dev.migwel.sts.service.SearchService;
+import org.springframework.stereotype.Component;
+
+import java.util.Optional;
+
+@Component
+public class RadioSearchService implements SearchService<RadioSearchRequest> {
+
+    @Override
+    public boolean isRelevant(Class<?> searchRequestType) {
+        return searchRequestType.isAssignableFrom(RadioSearchRequest.class);
+    }
+
+    @Override
+    public Optional<Song> search(RadioSearchRequest searchRequest) {
+        return Optional.empty();
+    }
+}

src/main/java/dev/migwel/sts/service/SearchService.java

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+package dev.migwel.sts.service;
+
+import dev.migwel.sts.model.SearchRequest;
+import dev.migwel.sts.model.Song;
+
+import java.util.Optional;
+
+public interface SearchService<T extends SearchRequest> {
+    boolean isRelevant(Class<?> searchRequestType);
+
+    Optional<Song> search(T searchRequest);
+}

src/main/java/dev/migwel/sts/service/SearchServiceFactory.java

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+package dev.migwel.sts.service;
+
+import dev.migwel.sts.model.SearchRequest;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+
+@Component
+public class SearchServiceFactory {
+
+    private final List<SearchService<?>> searchServices;
+
+    @Autowired
+    public SearchServiceFactory(List<SearchService<?>> searchServices) {
+        this.searchServices = List.copyOf(searchServices);
+    }
+
+    public <T extends SearchRequest> SearchService<T> getSearchService(T searchRequest) {
+        for (SearchService<?> searchService : searchServices) {
+            if (searchService.isRelevant(searchRequest.getClass())) {
+                return (SearchService<T>) searchService;
+            }
+        }
+        throw new IllegalArgumentException("No search service available for this search request");
+    }
+}

src/main/java/dev/migwel/sts/sonos/SonosSearchService.java

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+package dev.migwel.sts.sonos;
+
+import dev.migwel.sts.model.Song;
+import dev.migwel.sts.model.SonosSearchRequest;
+import dev.migwel.sts.service.SearchService;
+
+import org.springframework.stereotype.Component;
+
+import java.util.Optional;
+
+@Component
+public class SonosSearchService implements SearchService<SonosSearchRequest> {
+    @Override
+    public boolean isRelevant(Class<?> searchRequestType) {
+        return searchRequestType.isAssignableFrom(SonosSearchRequest.class);
+    }
+
+    @Override
+    public Optional<Song> search(SonosSearchRequest searchRequest) {
+        return Optional.empty();
+    }
+}

src/test/java/dev/migwel/sts/ApplicationTest.java

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+package dev.migwel.sts;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import dev.migwel.sts.service.SearchService;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import java.util.List;
+
+@SpringBootTest
+class ApplicationTest {
+
+    private final List<SearchService<?>> searchServices;
+
+    @Autowired
+    public ApplicationTest(List<SearchService<?>> searchServices) {
+        this.searchServices = searchServices;
+    }
+
+    @Test
+    void loadContexts() {
+        assertNotNull(searchServices);
+        assertFalse(searchServices.isEmpty());
+    }
+}

src/test/java/dev/migwel/sts/service/SearchServiceTest.java

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+package dev.migwel.sts.service;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import dev.migwel.sts.Application;
+import dev.migwel.sts.model.SearchRequest;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import java.util.List;
+
+@SpringJUnitConfig(Application.class)
+class SearchServiceTest {
+
+    private final List<SearchService<?>> searchServices;
+
+    @Autowired
+    public SearchServiceTest(List<SearchService<?>> searchServices) {
+        this.searchServices = searchServices;
+    }
+
+    @Test
+    void isRelevant_onlyOneRelevantServicePerRequestType() {
+        Class<?>[] permittedSearchRequests = SearchRequest.class.getPermittedSubclasses();
+        for (Class<?> permittedSearchRequest : permittedSearchRequests) {
+            int nbRelevantSearchServices = 0;
+            for (SearchService<?> searchService : searchServices) {
+                if (searchService.isRelevant(permittedSearchRequest)) {
+                    nbRelevantSearchServices += 1;
+                }
+            }
+            assertEquals(
+                    1,
+                    nbRelevantSearchServices,
+                    "Didn't find exactly one search service for request "
+                            + permittedSearchRequest.getName());
+        }
+    }
+}