HBASE-26834 Adapt ConnectionRule for both sync and async connections (branch-2)

hbase-it/src/test/java/org/apache/hadoop/hbase/TestShellExecEndpointCoprocessor.java

@@ -56,7 +56,7 @@ public class TestShellExecEndpointCoprocessor {
 
   @Rule
   public final ConnectionRule connectionRule =
-    new ConnectionRule(miniClusterRule::createConnection);
+    ConnectionRule.createAsyncConnectionRule(miniClusterRule::createAsyncConnection);
 
   @Test
   public void testShellExecUnspecified() {
@@ -69,7 +69,7 @@ public void testShellExecForeground() {
   }
 
   private void testShellExecForeground(final Consumer<ShellExecRequest.Builder> consumer) {
-    final AsyncConnection conn = connectionRule.getConnection();
+    final AsyncConnection conn = connectionRule.getAsyncConnection();
     final AsyncAdmin admin = conn.getAdmin();
 
     final String command = "echo -n \"hello world\"";
@@ -87,7 +87,7 @@ private void testShellExecForeground(final Consumer<ShellExecRequest.Builder> co
 
   @Test
   public void testShellExecBackground() throws IOException {
-    final AsyncConnection conn = connectionRule.getConnection();
+    final AsyncConnection conn = connectionRule.getAsyncConnection();
     final AsyncAdmin admin = conn.getAdmin();
 
     final File testDataDir = ensureTestDataDirExists(miniClusterRule.getTestingUtility());
@@ -121,7 +121,7 @@ private static File ensureTestDataDirExists(
     final Path testDataDir = Optional.of(testingUtility)
       .map(HBaseTestingUtility::getDataTestDir)
       .map(Object::toString)
-      .map(val -> Paths.get(val))
+      .map(Paths::get)
       .orElseThrow(() -> new RuntimeException("Unable to locate temp directory path."));
     final File testDataDirFile = Files.createDirectories(testDataDir).toFile();
     assertTrue(testDataDirFile.exists());

hbase-server/src/test/java/org/apache/hadoop/hbase/ConnectionRule.java

@@ -21,6 +21,7 @@
 import java.util.concurrent.CompletableFuture;
 import java.util.function.Supplier;
 import org.apache.hadoop.hbase.client.AsyncConnection;
+import org.apache.hadoop.hbase.client.Connection;
 import org.junit.ClassRule;
 import org.junit.Rule;
 import org.junit.rules.ExternalResource;
@@ -35,7 +36,7 @@
  *   public class TestMyClass {
  *     private static final MiniClusterRule miniClusterRule = MiniClusterRule.newBuilder().build();
  *     private static final ConnectionRule connectionRule =
- *       new ConnectionRule(miniClusterRule::createConnection);
+ *       ConnectionRule.createAsyncConnectionRule(miniClusterRule::createConnection);
  *
  *     @ClassRule
  *     public static final TestRule rule = RuleChain
@@ -44,32 +45,87 @@
  *   }
  * }</pre>
  */
-public class ConnectionRule extends ExternalResource {
+public final class ConnectionRule extends ExternalResource {
 
-  private final Supplier<CompletableFuture<AsyncConnection>> connectionSupplier;
-  private AsyncConnection connection;
+  private final Supplier<Connection> connectionSupplier;
+  private final Supplier<CompletableFuture<AsyncConnection>> asyncConnectionSupplier;
 
-  public ConnectionRule(final Supplier<CompletableFuture<AsyncConnection>> connectionSupplier) {
+  private Connection connection;
+  private AsyncConnection asyncConnection;
+
+  public static ConnectionRule createConnectionRule(
+    final Supplier<Connection> connectionSupplier
+  ) {
+    return new ConnectionRule(connectionSupplier, null);
+  }
+
+  public static ConnectionRule createAsyncConnectionRule(
+    final Supplier<CompletableFuture<AsyncConnection>> asyncConnectionSupplier
+  ) {
+    return new ConnectionRule(null, asyncConnectionSupplier);
+  }
+
+  public static ConnectionRule createConnectionRule(
+    final Supplier<Connection> connectionSupplier,
+    final Supplier<CompletableFuture<AsyncConnection>> asyncConnectionSupplier
+  ) {
+    return new ConnectionRule(connectionSupplier, asyncConnectionSupplier);
+  }
+
+  private ConnectionRule(
+    final Supplier<Connection> connectionSupplier,
+    final Supplier<CompletableFuture<AsyncConnection>> asyncConnectionSupplier
+  ) {
     this.connectionSupplier = connectionSupplier;
+    this.asyncConnectionSupplier = asyncConnectionSupplier;
   }
 
-  public AsyncConnection getConnection() {
+  public Connection getConnection() {
+    if (connection == null) {
+      throw new IllegalStateException(
+        "ConnectionRule not initialized with a synchronous connection.");
+    }
     return connection;
   }
 
+  public AsyncConnection getAsyncConnection() {
+    if (asyncConnection == null) {
+      throw new IllegalStateException(
+        "ConnectionRule not initialized with an asynchronous connection.");
+    }
+    return asyncConnection;
+  }
+
   @Override
   protected void before() throws Throwable {
-    this.connection = connectionSupplier.get().join();
+    if (connectionSupplier != null) {
+      this.connection = connectionSupplier.get();
+    }
+    if (asyncConnectionSupplier != null) {
+      this.asyncConnection = asyncConnectionSupplier.get().join();
+    }
   }
 
   @Override
   protected void after() {
-    if (this.connection != null) {
-      try {
-        connection.close();
-      } catch (IOException e) {
-        throw new RuntimeException(e);
+    CompletableFuture<Void> closeConnection = CompletableFuture.runAsync(() -> {
+      if (this.connection != null) {
+        try {
+          connection.close();
+        } catch (IOException e) {
+          throw new RuntimeException(e);
+        }
       }
-    }
+    });
+    CompletableFuture<Void> closeAsyncConnection = CompletableFuture.runAsync(() -> {
+      if (this.asyncConnection != null) {
+        try {
+          asyncConnection.close();
+        } catch (IOException e) {
+          throw new RuntimeException(e);
+        }
+      }
+    });
+    CompletableFuture.allOf(closeConnection, closeAsyncConnection).join();
   }
 }

hbase-server/src/test/java/org/apache/hadoop/hbase/MiniClusterRule.java

@@ -22,6 +22,7 @@
 import java.util.function.Supplier;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.client.AsyncConnection;
+import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.junit.ClassRule;
 import org.junit.Rule;
@@ -42,7 +43,7 @@
  *
  *     @Rule
  *     public final ConnectionRule connectionRule =
- *       new ConnectionRule(miniClusterRule::createConnection);
+ *       ConnectionRule.createAsyncConnectionRule(miniClusterRule::createAsyncConnection);
  *   }
  * }</pre>
  */
@@ -107,11 +108,26 @@ public HBaseTestingUtility getTestingUtility() {
     return testingUtility;
   }
 
+  /**
+   * Create a {@link Connection} to the managed {@link MiniHBaseCluster}. It's up to the caller
+   * to {@link Connection#close() close()} the connection when finished.
+   */
+  public Connection createConnection() {
+    if (miniCluster == null) {
+      throw new IllegalStateException("test cluster not initialized");
+    }
+    try {
+      return ConnectionFactory.createConnection(miniCluster.getConf());
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
   /**
    * Create a {@link AsyncConnection} to the managed {@link MiniHBaseCluster}. It's up to the caller
    * to {@link AsyncConnection#close() close()} the connection when finished.
    */
-  public CompletableFuture<AsyncConnection> createConnection() {
+  public CompletableFuture<AsyncConnection> createAsyncConnection() {
     if (miniCluster == null) {
       throw new IllegalStateException("test cluster not initialized");
     }

hbase-server/src/test/java/org/apache/hadoop/hbase/master/http/TestApiV1ClusterMetricsResource.java

@@ -80,8 +80,8 @@ public class TestApiV1ClusterMetricsResource {
     })
     .build();
   private static final ConnectionRule connectionRule =
-    new ConnectionRule(miniClusterRule::createConnection);
-  private static final ClassSetup classRule = new ClassSetup(connectionRule::getConnection);
+    ConnectionRule.createAsyncConnectionRule(miniClusterRule::createAsyncConnection);
+  private static final ClassSetup classRule = new ClassSetup(connectionRule::getAsyncConnection);
 
   private static final class ClassSetup extends ExternalResource {
 

hbase-server/src/test/java/org/apache/hadoop/hbase/master/http/TestMetaBrowser.java

@@ -68,9 +68,9 @@ public class TestMetaBrowser {
   public static final MiniClusterRule miniClusterRule = MiniClusterRule.newBuilder().build();
 
   private final ConnectionRule connectionRule =
-    new ConnectionRule(miniClusterRule::createConnection);
+    ConnectionRule.createAsyncConnectionRule(miniClusterRule::createAsyncConnection);
   private final ClearUserNamespacesAndTablesRule clearUserNamespacesAndTablesRule =
-    new ClearUserNamespacesAndTablesRule(connectionRule::getConnection);
+    new ClearUserNamespacesAndTablesRule(connectionRule::getAsyncConnection);
 
   @Rule
   public TestRule rule = RuleChain.outerRule(connectionRule)
@@ -84,7 +84,7 @@ public class TestMetaBrowser {
 
   @Before
   public void before() {
-    connection = connectionRule.getConnection();
+    connection = connectionRule.getAsyncConnection();
     admin = connection.getAdmin();
   }