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

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

@@ -0,0 +1,45 @@
+package io.ebeaninternal.server.transaction;
+
+import io.ebean.config.CurrentTenantProvider;
+import io.ebeaninternal.api.SpiTransaction;
+import io.ebeaninternal.util.JdbcClose;
+
+import javax.persistence.PersistenceException;
+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 TransactionFactoryTenantWithRead extends TransactionFactoryTenant {
+
+  TransactionFactoryTenantWithRead(TransactionManager manager, DataSourceSupplier dataSourceSupplier, CurrentTenantProvider tenantProvider) {
+    super(manager, dataSourceSupplier, tenantProvider);
+  }
+
+  @Override
+  public SpiTransaction createQueryTransaction(Object tenantId) {
+
+    Connection connection = null;
+    try {
+      if (tenantId == null) {
+        // tenantId not set (by lazy loading) so get current tenantId
+        tenantId = tenantProvider.currentId();
+      }
+      connection = dataSourceSupplier.getReadOnlyConnection(tenantId);
+      return new ImplicitReadOnlyTransaction(connection, tenantId);
+
+    } catch (PersistenceException ex) {
+      JdbcClose.close(connection);
+      throw ex;
+
+    } catch (SQLException ex) {
+      throw new PersistenceException(ex);
+    }
+  }
+}