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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.index.sai.disk.v1;
import java.io.Closeable;
import java.util.EnumMap;
import java.util.Map;
import org.apache.cassandra.index.sai.disk.format.IndexComponent;
import org.apache.cassandra.index.sai.disk.format.IndexDescriptor;
import org.apache.cassandra.index.sai.utils.IndexIdentifier;
import org.apache.cassandra.index.sai.utils.IndexTermType;
import org.apache.cassandra.io.util.FileHandle;
import org.apache.cassandra.io.util.FileUtils;
/**
* Maintains a mapping of {@link IndexComponent}s to associated {@link FileHandle}s for
* read operations on the components. Users of this class are returned copies of the
* {@link FileHandle}s using {@link FileHandle#sharedCopy()} so returned handles still
* need to be closed by the user.
*/
public class PerColumnIndexFiles implements Closeable
{
private final Map files = new EnumMap<>(IndexComponent.class);
private final IndexDescriptor indexDescriptor;
private final IndexIdentifier indexIdentifier;
public PerColumnIndexFiles(IndexDescriptor indexDescriptor, IndexTermType indexTermType, IndexIdentifier indexIdentifier)
{
this.indexDescriptor = indexDescriptor;
this.indexIdentifier = indexIdentifier;
for (IndexComponent component : indexDescriptor.version.onDiskFormat().perColumnIndexComponents(indexTermType))
{
if (component == IndexComponent.META || component == IndexComponent.COLUMN_COMPLETION_MARKER)
continue;
files.put(component, indexDescriptor.createPerIndexFileHandle(component, indexIdentifier, this::close));
}
}
public FileHandle termsData()
{
return getFile(IndexComponent.TERMS_DATA);
}
public FileHandle postingLists()
{
return getFile(IndexComponent.POSTING_LISTS);
}
public FileHandle balancedTree()
{
return getFile(IndexComponent.BALANCED_TREE);
}
public FileHandle compressedVectors()
{
return getFile(IndexComponent.COMPRESSED_VECTORS);
}
private FileHandle getFile(IndexComponent indexComponent)
{
FileHandle file = files.get(indexComponent);
if (file == null)
throw new IllegalArgumentException(String.format(indexIdentifier.logMessage("Component %s not found for SSTable %s"),
indexComponent, indexDescriptor.sstableDescriptor));
return file.sharedCopy();
}
@Override
public void close()
{
FileUtils.closeQuietly(files.values());
}
}