| /* |
| * |
| * 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.transform; |
| |
| import net.nicoulaj.compilecommand.annotations.DontInline; |
| import org.apache.cassandra.db.rows.BaseRowIterator; |
| |
| // A Transformation that can stop an iterator earlier than its natural exhaustion |
| public abstract class StoppingTransformation<I extends BaseRowIterator<?>> extends Transformation<I> |
| { |
| private BaseIterator rows; |
| private BaseIterator partitions; |
| |
| /** |
| * If invoked by a subclass, any partitions iterator this transformation has been applied to will terminate |
| * after any currently-processing item is returned, as will any row/unfiltered iterator |
| */ |
| @DontInline |
| protected void stop() |
| { |
| if (partitions != null) |
| { |
| partitions.stop.isSignalled = true; |
| partitions.stopChild.isSignalled = true; |
| } |
| |
| stopInPartition(); |
| } |
| |
| /** |
| * If invoked by a subclass, any rows/unfiltered iterator this transformation has been applied to will terminate |
| * after any currently-processing item is returned |
| */ |
| @DontInline |
| protected void stopInPartition() |
| { |
| if (rows != null) |
| { |
| rows.stop.isSignalled = true; |
| rows.stopChild.isSignalled = true; |
| } |
| } |
| |
| @Override |
| protected void attachTo(BasePartitions partitions) |
| { |
| assert this.partitions == null; |
| this.partitions = partitions; |
| } |
| |
| @Override |
| protected void attachTo(BaseRows rows) |
| { |
| assert this.rows == null; |
| this.rows = rows; |
| } |
| |
| @Override |
| protected void onClose() |
| { |
| partitions = null; |
| } |
| |
| @Override |
| protected void onPartitionClose() |
| { |
| rows = null; |
| } |
| } |