| /* |
| * 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.cassandra.index.transactions; |
| |
| import org.apache.cassandra.db.DeletionTime; |
| import org.apache.cassandra.db.rows.Row; |
| |
| /** |
| * Performs garbage collection of index entries during a cleanup. |
| * |
| * Notifies registered indexers of each partition being removed and |
| * |
| * Compaction & Cleanup are somewhat simpler than dealing with incoming writes, |
| * being only concerned with cleaning up stale index entries. |
| * |
| * When multiple versions of a row are compacted, the CleanupTransaction is |
| * notified of the versions being merged, which it diffs against the merge result |
| * and forwards to the registered Index.Indexer instances when on commit. |
| * |
| * Instances are currently scoped to a single row within a partition, but this could be improved to batch process |
| * multiple rows within a single partition. |
| */ |
| public interface CleanupTransaction extends IndexTransaction |
| { |
| |
| void onPartitionDeletion(DeletionTime deletionTime); |
| void onRowDelete(Row row); |
| |
| CleanupTransaction NO_OP = new CleanupTransaction() |
| { |
| public void start(){} |
| public void onPartitionDeletion(DeletionTime deletionTime){} |
| public void onRowDelete(Row row){} |
| public void commit(){} |
| }; |
| } |