[MINDEXER-198][MINDEXER-199] Make all modules Java11 and unify Search API backend transports

pom.xml

@@ -97,7 +97,8 @@ under the License.
     <maven.compiler.source>${javaVersion}</maven.compiler.source>
     <maven.compiler.target>${javaVersion}</maven.compiler.target>
     <minimalMavenBuildVersion>[3.8.7,)</minimalMavenBuildVersion>
-    <minimalJavaBuildVersion>[17.0.6,18)</minimalJavaBuildVersion>
+    <!-- spotless on Java21: move upper once new parent POM used -->
+    <minimalJavaBuildVersion>[17.0.6,21)</minimalJavaBuildVersion>
 
     <surefire.redirectTestOutputToFile>true</surefire.redirectTestOutputToFile>
     <failsafe.redirectTestOutputToFile>true</failsafe.redirectTestOutputToFile>

search-api/pom.xml

@@ -31,10 +31,6 @@ under the License.
   <name>Maven :: Search API</name>
   <description>Indexer Search API.</description>
 
-  <properties>
-    <javaVersion>8</javaVersion>
-  </properties>
-
   <dependencies>
     <!-- Test -->
     <dependency>

search-backend-remoterepository/src/main/java/org/apache/maven/search/backend/remoterepository/internal/Java11HttpClientRemoteRepositorySearchTransport.java → search-api/src/main/java/org/apache/maven/search/transport/Java11HttpClientTransport.java

@@ -16,7 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.apache.maven.search.backend.remoterepository.internal;
+package org.apache.maven.search.transport;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -29,14 +29,12 @@
 import java.util.Map;
 import java.util.stream.Collectors;
 
-import org.apache.maven.search.backend.remoterepository.RemoteRepositorySearchTransport;
-
 import static java.util.Objects.requireNonNull;
 
 /**
  * Java 11 {@link HttpClient} backed transport.
  */
-public class Java11HttpClientRemoteRepositorySearchTransport implements RemoteRepositorySearchTransport {
+public class Java11HttpClientTransport implements Transport {
     private static class ResponseImpl implements Response {
 
         private final HttpResponse<?> response;
@@ -78,11 +76,11 @@ public void close() throws IOException {
 
     private final HttpClient client;
 
-    public Java11HttpClientRemoteRepositorySearchTransport() {
+    public Java11HttpClientTransport() {
         this(Duration.ofSeconds(10L));
     }
 
-    public Java11HttpClientRemoteRepositorySearchTransport(Duration timeout) {
+    public Java11HttpClientTransport(Duration timeout) {
         this(
                 timeout,
                 HttpClient.newBuilder()
@@ -91,7 +89,7 @@ public Java11HttpClientRemoteRepositorySearchTransport(Duration timeout) {
                         .build());
     }
 
-    public Java11HttpClientRemoteRepositorySearchTransport(Duration timeout, HttpClient client) {
+    public Java11HttpClientTransport(Duration timeout, HttpClient client) {
         this.timeout = requireNonNull(timeout);
         this.client = requireNonNull(client);
     }

search-backend-remoterepository/src/main/java/org/apache/maven/search/backend/remoterepository/RemoteRepositorySearchTransport.java → search-api/src/main/java/org/apache/maven/search/transport/Transport.java

@@ -16,17 +16,20 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.apache.maven.search.backend.remoterepository;
+package org.apache.maven.search.transport;
 
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Map;
 
 /**
- * A trivial "transport abstraction" to make possible pluggable implementations.
+ * A trivial "transport abstraction" to make possible pluggable implementations. Most obviously leans toward HTTP,
+ * but is not limited to.
+ *
+ * @since TBD
  */
-public interface RemoteRepositorySearchTransport {
+public interface Transport {
     /**
      * Trivial response.
      */
@@ -39,12 +42,12 @@ interface Response extends Closeable {
     }
 
     /**
-     * This method should issue a HTTP GET requests using {@code serviceUri} and return response.
+     * This method should issue HTTP GET requests using {@code serviceUri} and return response.
      */
     Response get(String serviceUri, Map<String, String> headers) throws IOException;
 
     /**
-     * This method should issue a HTTP HEAD requests using {@code serviceUri} and return response.
+     * This method should issue HTTP HEAD requests using {@code serviceUri} and return response.
      */
     Response head(String serviceUri, Map<String, String> headers) throws IOException;
 }

search-backend-remoterepository/pom.xml

@@ -31,10 +31,6 @@ under the License.
   <name>Maven :: Search API Remote Repository Backend</name>
   <description>Indexer Search Backend implemented by remote repository (limited).</description>
 
-  <properties>
-    <javaVersion>11</javaVersion>
-  </properties>
-
   <dependencies>
     <dependency>
       <groupId>org.apache.maven.indexer</groupId>

search-backend-remoterepository/src/main/java/org/apache/maven/search/backend/remoterepository/RemoteRepositorySearchBackendFactory.java

@@ -20,8 +20,9 @@
 
 import org.apache.maven.search.backend.remoterepository.extractor.MavenCentralResponseExtractor;
 import org.apache.maven.search.backend.remoterepository.extractor.Nx2ResponseExtractor;
-import org.apache.maven.search.backend.remoterepository.internal.Java11HttpClientRemoteRepositorySearchTransport;
 import org.apache.maven.search.backend.remoterepository.internal.RemoteRepositorySearchBackendImpl;
+import org.apache.maven.search.transport.Java11HttpClientTransport;
+import org.apache.maven.search.transport.Transport;
 
 /**
  * The remote repository search backend factory.
@@ -45,7 +46,7 @@ public static RemoteRepositorySearchBackend createDefaultMavenCentral() {
                 BACKEND_ID,
                 CENTRAL_REPOSITORY_ID,
                 CENTRAL_URI,
-                new Java11HttpClientRemoteRepositorySearchTransport(),
+                new Java11HttpClientTransport(),
                 new MavenCentralResponseExtractor());
     }
 
@@ -57,7 +58,7 @@ public static RemoteRepositorySearchBackend createDefaultRAOReleases() {
                 BACKEND_ID,
                 RAO_RELEASES_REPOSITORY_ID,
                 RAO_RELEASES_URI,
-                new Java11HttpClientRemoteRepositorySearchTransport(),
+                new Java11HttpClientTransport(),
                 new Nx2ResponseExtractor());
     }
 
@@ -68,7 +69,7 @@ public static RemoteRepositorySearchBackend create(
             String backendId,
             String repositoryId,
             String baseUri,
-            RemoteRepositorySearchTransport transport,
+            Transport transport,
             ResponseExtractor responseExtractor) {
         return new RemoteRepositorySearchBackendImpl(backendId, repositoryId, baseUri, transport, responseExtractor);
     }

search-backend-remoterepository/src/main/java/org/apache/maven/search/backend/remoterepository/internal/RemoteRepositorySearchBackendImpl.java

@@ -35,9 +35,9 @@
 import org.apache.maven.search.backend.remoterepository.RecordFactory;
 import org.apache.maven.search.backend.remoterepository.RemoteRepositorySearchBackend;
 import org.apache.maven.search.backend.remoterepository.RemoteRepositorySearchResponse;
-import org.apache.maven.search.backend.remoterepository.RemoteRepositorySearchTransport;
 import org.apache.maven.search.backend.remoterepository.ResponseExtractor;
 import org.apache.maven.search.support.SearchBackendSupport;
+import org.apache.maven.search.transport.Transport;
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
 import org.jsoup.parser.Parser;
@@ -53,7 +53,7 @@
 public class RemoteRepositorySearchBackendImpl extends SearchBackendSupport implements RemoteRepositorySearchBackend {
     private final String baseUri;
 
-    private final RemoteRepositorySearchTransport transport;
+    private final Transport transport;
 
     private final ResponseExtractor responseExtractor;
 
@@ -74,7 +74,7 @@ public RemoteRepositorySearchBackendImpl(
             String backendId,
             String repositoryId,
             String baseUri,
-            RemoteRepositorySearchTransport transport,
+            Transport transport,
             ResponseExtractor responseExtractor) {
         super(backendId, repositoryId);
         this.baseUri = requireNonNull(baseUri);
@@ -149,7 +149,7 @@ public RemoteRepositorySearchResponse search(SearchRequest searchRequest) throws
         Document document = null;
         if (state.ordinal() < State.GAVCE.ordinal()) {
             Parser parser = state == State.GA ? Parser.xmlParser() : Parser.htmlParser();
-            try (RemoteRepositorySearchTransport.Response response = transport.get(uri, commonHeaders)) {
+            try (Transport.Response response = transport.get(uri, commonHeaders)) {
                 if (response.getCode() == 200) {
                     document = Jsoup.parse(response.getBody(), StandardCharsets.UTF_8.name(), uri, parser);
                 }
@@ -173,12 +173,11 @@ public RemoteRepositorySearchResponse search(SearchRequest searchRequest) throws
                     throw new IllegalStateException("State" + state); // checkstyle
             }
         } else {
-            try (RemoteRepositorySearchTransport.Response response = transport.head(uri, commonHeaders)) {
+            try (Transport.Response response = transport.head(uri, commonHeaders)) {
                 if (response.getCode() == 200) {
                     boolean matches = context.getSha1() == null;
                     if (context.getSha1() != null) {
-                        try (RemoteRepositorySearchTransport.Response sha1Response =
-                                transport.get(uri + ".sha1", commonHeaders)) {
+                        try (Transport.Response sha1Response = transport.get(uri + ".sha1", commonHeaders)) {
                             if (response.getCode() == 200) {
                                 try (InputStream body = sha1Response.getBody()) {
                                     String remoteSha1 = readChecksum(body);
@@ -211,7 +210,7 @@ private static String readChecksum(InputStream inputStream) throws IOException {
                     break;
                 }
                 line = line.trim();
-                if (line.length() > 0) {
+                if (!line.isEmpty()) {
                     checksum = line;
                     break;
                 }

search-backend-smo/pom.xml

@@ -31,10 +31,6 @@ under the License.
   <name>Maven :: Search API SMO Backend</name>
   <description>Indexer Search Backend implemented by SMO.</description>
 
-  <properties>
-    <javaVersion>8</javaVersion>
-  </properties>
-
   <dependencies>
     <dependency>
       <groupId>org.apache.maven.indexer</groupId>
@@ -73,39 +69,6 @@ under the License.
         <directory>src/main/filtered-resources</directory>
       </resource>
     </resources>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <executions>
-          <execution>
-            <id>compile-java-11</id>
-            <goals>
-              <goal>compile</goal>
-            </goals>
-            <phase>compile</phase>
-            <configuration>
-              <release>11</release>
-              <compileSourceRoots>
-                <compileSourceRoot>${project.basedir}/src/main/java11</compileSourceRoot>
-              </compileSourceRoots>
-              <multiReleaseOutput>true</multiReleaseOutput>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-jar-plugin</artifactId>
-        <configuration>
-          <archive>
-            <manifestEntries>
-              <Multi-Release>true</Multi-Release>
-            </manifestEntries>
-          </archive>
-        </configuration>
-      </plugin>
-    </plugins>
   </build>
 
 </project>

search-backend-smo/src/main/java/org/apache/maven/search/backend/smo/SmoSearchBackendFactory.java

@@ -19,7 +19,8 @@
 package org.apache.maven.search.backend.smo;
 
 import org.apache.maven.search.backend.smo.internal.SmoSearchBackendImpl;
-import org.apache.maven.search.backend.smo.internal.SmoSearchTransportSupplier;
+import org.apache.maven.search.transport.Java11HttpClientTransport;
+import org.apache.maven.search.transport.Transport;
 
 /**
  * The SMO search backend factory.
@@ -35,15 +36,13 @@ public class SmoSearchBackendFactory {
      * Creates "default" SMO search backend suitable for most use cases.
      */
     public SmoSearchBackend createDefault() {
-        return create(
-                DEFAULT_BACKEND_ID, DEFAULT_REPOSITORY_ID, DEFAULT_SMO_URI, new SmoSearchTransportSupplier().get());
+        return create(DEFAULT_BACKEND_ID, DEFAULT_REPOSITORY_ID, DEFAULT_SMO_URI, new Java11HttpClientTransport());
     }
 
     /**
      * Creates SMO search backend using provided parameters.
      */
-    public SmoSearchBackend create(
-            String backendId, String repositoryId, String smoUri, SmoSearchTransport transportSupport) {
-        return new SmoSearchBackendImpl(backendId, repositoryId, smoUri, transportSupport);
+    public SmoSearchBackend create(String backendId, String repositoryId, String smoUri, Transport transport) {
+        return new SmoSearchBackendImpl(backendId, repositoryId, smoUri, transport);
     }
 }