#1232 - Performance: Add support for a second read-only DataSource (for implicit query-only transactions)

src/main/java/io/ebeaninternal/server/transaction/TransactionFactoryBasicWithRead.java

@@ -0,0 +1,45 @@
+package io.ebeaninternal.server.transaction;
+
+import io.ebeaninternal.api.SpiTransaction;
+import io.ebeaninternal.util.JdbcClose;
+
+import javax.persistence.PersistenceException;
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+
+/**
+ * Aware of read only autoCommit based DataSource.
+ * <p>
+ * This means for implicit query only transactions we can:
+ * - Use the read only DataSource
+ * - Skip explicit commit (as we use AutoCommit instead)
+ * </p>
+ */
+class TransactionFactoryBasicWithRead extends TransactionFactoryBasic {
+
+
+  private final DataSource readOnlyDataSource;
+
+  TransactionFactoryBasicWithRead(TransactionManager manager, DataSourceSupplier dataSourceSupplier) {
+    super(manager, dataSourceSupplier);
+    this.readOnlyDataSource = dataSourceSupplier.getReadOnlyDataSource();
+  }
+
+  @Override
+  public SpiTransaction createQueryTransaction(Object tenantId) {
+
+    Connection connection = null;
+    try {
+      connection = readOnlyDataSource.getConnection();
+      return new ImplicitReadOnlyTransaction(connection);
+
+    } catch (PersistenceException ex) {
+      JdbcClose.close(connection);
+      throw ex;
+
+    } catch (SQLException ex) {
+      throw new PersistenceException(ex);
+    }
+  }
+}