| /* |
| * Copyright 2009-2013 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.impls; |
| |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| 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.api.ILSMIndex; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTracker; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerProvider; |
| |
| /** |
| * Operation tracker that does nothing. |
| * WARNING: This op tracker should only be used for specific testing purposes. |
| * It is assumed than an op tracker cooperates with an lsm index to synchronize flushes with |
| * regular operations, and this implementation does no such tracking at all. |
| */ |
| public class NoOpOperationTrackerProvider implements ILSMOperationTrackerProvider { |
| private static final long serialVersionUID = 1L; |
| |
| public static NoOpOperationTrackerProvider INSTANCE = new NoOpOperationTrackerProvider(); |
| |
| @Override |
| public ILSMOperationTracker getOperationTracker(IHyracksTaskContext ctx) { |
| return new ILSMOperationTracker() { |
| |
| @Override |
| public void completeOperation(ILSMIndex index, LSMOperationType opType, |
| ISearchOperationCallback searchCallback, IModificationOperationCallback modificationCallback) |
| throws HyracksDataException { |
| // Do nothing. |
| } |
| |
| @Override |
| public void beforeOperation(ILSMIndex index, LSMOperationType opType, |
| ISearchOperationCallback searchCallback, IModificationOperationCallback modificationCallback) |
| throws HyracksDataException { |
| } |
| |
| @Override |
| public void afterOperation(ILSMIndex index, LSMOperationType opType, |
| ISearchOperationCallback searchCallback, IModificationOperationCallback modificationCallback) |
| throws HyracksDataException { |
| // Do nothing. |
| } |
| }; |
| } |
| |
| // Enforce singleton. |
| private NoOpOperationTrackerProvider() { |
| } |
| |
| }; |