| /* |
| * 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.ColumnFilter; |
| import org.apache.cassandra.db.filter.DataLimits; |
| import org.apache.cassandra.db.filter.RowFilter; |
| import org.apache.cassandra.db.partitions.PartitionIterator; |
| import org.apache.cassandra.db.partitions.UnfilteredPartitionIterator; |
| import org.apache.cassandra.exceptions.RequestExecutionException; |
| import org.apache.cassandra.schema.TableMetadata; |
| import org.apache.cassandra.service.ClientState; |
| |
| /** |
| * Base class for the {@code ReadQuery} implementations use to query virtual tables. |
| */ |
| public abstract class VirtualTableReadQuery extends AbstractReadQuery |
| { |
| protected VirtualTableReadQuery(TableMetadata metadata, |
| int nowInSec, |
| ColumnFilter columnFilter, |
| RowFilter rowFilter, |
| DataLimits limits) |
| { |
| super(metadata, nowInSec, columnFilter, rowFilter, limits); |
| } |
| |
| @Override |
| public ReadExecutionController executionController() |
| { |
| return ReadExecutionController.empty(); |
| } |
| |
| @Override |
| public PartitionIterator execute(ConsistencyLevel consistency, |
| ClientState clientState, |
| long queryStartNanoTime) throws RequestExecutionException |
| { |
| return executeInternal(executionController()); |
| } |
| |
| @Override |
| @SuppressWarnings("resource") |
| public UnfilteredPartitionIterator executeLocally(ReadExecutionController executionController) |
| { |
| UnfilteredPartitionIterator resultIterator = queryVirtualTable(); |
| return limits().filter(rowFilter().filter(resultIterator, nowInSec()), nowInSec(), selectsFullPartition()); |
| } |
| |
| protected abstract UnfilteredPartitionIterator queryVirtualTable(); |
| } |