/*
* 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 and 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(){}
};
}