| package edu.uci.ics.hyracks.storage.am.lsm.common.impls; |
| |
| 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.ILSMOperationTrackerFactory; |
| |
| /** |
| * 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 NoOpOperationTrackerFactory implements ILSMOperationTrackerFactory { |
| private static final long serialVersionUID = 1L; |
| |
| public static NoOpOperationTrackerFactory INSTANCE = new NoOpOperationTrackerFactory(); |
| |
| @Override |
| public ILSMOperationTracker createOperationTracker(ILSMIndex index) { |
| return new ILSMOperationTracker() { |
| |
| @Override |
| public void completeOperation(LSMOperationType opType, ISearchOperationCallback searchCallback, |
| IModificationOperationCallback modificationCallback) throws HyracksDataException { |
| // Do nothing. |
| } |
| |
| @Override |
| public void beforeOperation(LSMOperationType opType, ISearchOperationCallback searchCallback, |
| IModificationOperationCallback modificationCallback) throws HyracksDataException { |
| } |
| |
| @Override |
| public void afterOperation(LSMOperationType opType, ISearchOperationCallback searchCallback, |
| IModificationOperationCallback modificationCallback) throws HyracksDataException { |
| // Do nothing. |
| } |
| }; |
| } |
| |
| // Enforce singleton. |
| private NoOpOperationTrackerFactory() { |
| } |
| |
| }; |