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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.db;
import org.apache.cassandra.db.filter.ClusteringIndexFilter;
import org.apache.cassandra.db.filter.ColumnFilter;
import org.apache.cassandra.db.partitions.PartitionUpdate;
import org.apache.cassandra.db.rows.UnfilteredRowIterator;
import org.apache.cassandra.db.rows.UnfilteredRowIteratorWithLowerBound;
import org.apache.cassandra.io.sstable.SSTableReadsListener;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.schema.TableId;
import org.apache.cassandra.utils.FBUtilities;
import static org.apache.cassandra.config.CassandraRelevantProperties.STORAGE_HOOK;
public interface StorageHook
{
public static final StorageHook instance = createHook();
public void reportWrite(TableId tableId, PartitionUpdate partitionUpdate);
public void reportRead(TableId tableId, DecoratedKey key);
public UnfilteredRowIteratorWithLowerBound makeRowIteratorWithLowerBound(ColumnFamilyStore cfs,
SSTableReader sstable,
DecoratedKey partitionKey,
ClusteringIndexFilter filter,
ColumnFilter selectedColumns,
SSTableReadsListener listener);
public UnfilteredRowIterator makeRowIterator(ColumnFamilyStore cfs,
SSTableReader sstable,
DecoratedKey key,
Slices slices,
ColumnFilter selectedColumns,
boolean reversed,
SSTableReadsListener listener);
static StorageHook createHook()
{
String className = STORAGE_HOOK.getString();
if (className != null)
{
return FBUtilities.construct(className, StorageHook.class.getSimpleName());
}
return new StorageHook()
{
public void reportWrite(TableId tableId, PartitionUpdate partitionUpdate) {}
public void reportRead(TableId tableId, DecoratedKey key) {}
public UnfilteredRowIteratorWithLowerBound makeRowIteratorWithLowerBound(ColumnFamilyStore cfs,
SSTableReader sstable, DecoratedKey partitionKey,
ClusteringIndexFilter filter,
ColumnFilter selectedColumns,
SSTableReadsListener listener)
{
return new UnfilteredRowIteratorWithLowerBound(partitionKey,
sstable,
filter,
selectedColumns,
listener);
}
public UnfilteredRowIterator makeRowIterator(ColumnFamilyStore cfs,
SSTableReader sstable,
DecoratedKey key,
Slices slices,
ColumnFilter selectedColumns,
boolean reversed,
SSTableReadsListener listener)
{
return sstable.rowIterator(key, slices, selectedColumns, reversed, listener);
}
};
}
}