/*
 * Copyright 2009-2012 by The Regents of the University of California
 * Licensed 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 from
 * 
 *     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 edu.uci.ics.hyracks.storage.am.lsm.common.api;

import java.util.List;

import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.storage.am.common.api.IIndex;
import edu.uci.ics.hyracks.storage.am.common.api.IModificationOperationCallback;
import edu.uci.ics.hyracks.storage.am.common.api.ISearchOperationCallback;
import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMHarness;

/**
 * Methods to be implemented by an LSM index, which are called from {@link LSMHarness}.
 * The implementations of the methods below should be thread agnostic.
 * Synchronization of LSM operations like updates/searches/flushes/merges are
 * done by the {@link LSMHarness}. For example, a flush() implementation should only
 * create and return the new on-disk component, ignoring the fact that
 * concurrent searches/updates/merges may be ongoing.
 */
public interface ILSMIndex extends IIndex {
    
    public void deactivate(boolean flushOnExit) throws HyracksDataException;

    public ILSMIndexAccessor createAccessor(IModificationOperationCallback modificationCallback,
            ISearchOperationCallback searchCallback);

    public boolean getFlushStatus(ILSMIndex index);

    public ILSMOperationTracker getOperationTracker();

    public ILSMIOOperationScheduler getIOScheduler();

    public List<ILSMComponent> getImmutableComponents();
}