| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.ignite.internal.sql.engine; |
| |
| import org.apache.ignite.internal.catalog.CatalogCommand; |
| import org.apache.ignite.internal.sql.engine.exec.ddl.DdlCommandHandler; |
| import org.apache.ignite.internal.sql.engine.exec.rel.AsyncRootNode; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Callback that is invoked when the query finishes prefetching. It is designed |
| * to allow sequential execution of SQL statements that are dependent on each other. |
| * |
| * <ol> |
| * <li>For {@code DML} queries, it is called after the cursor has finished prefetching |
| * the initial batch of rows (see {@link AsyncRootNode#startPrefetch}).</li> |
| * <li>For {@code DDL} queries, it is called after the corresponding DDL |
| * command has completed (see {@link DdlCommandHandler#handle(CatalogCommand)}.</li> |
| * </ol> |
| * |
| * <p>This callback is invoked asynchronously in the "{@code execution pool}". |
| */ |
| @FunctionalInterface |
| public interface QueryPrefetchCallback { |
| /** |
| * Called when the query finishes prefetching. |
| * |
| * @param ex Exceptional completion cause, or {@code null} if prefetch completed successfully. |
| */ |
| void onPrefetchComplete(@Nullable Throwable ex); |
| } |