/*
* 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.jena.tdb.sys;
import java.util.Iterator ;
/** A DatasetControl is an encapsulation of what to do on reads and writes.
* In addition, iterators returned can be tied back to the original request
* to check they are still valid.
*/
public interface DatasetControl
{
/** Fine grained, internal update - start */
public void startUpdate() ;
/** Fine grained, internal update - finish */
public void finishUpdate();
/** Signal the start of an internal read operation */
public void startRead();
/** Signal the completion of an internal read operation */
public void finishRead();
/** Notify an iterator being created. */
public <T> Iterator<T> iteratorControl(Iterator<T> iter) ;
}