| package edu.uci.ics.hyracks.storage.am.lsm.common.impls; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| 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.common.impls.NoOpOperationCallback; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndex; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexAccessor; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTracker; |
| |
| public class ThreadCountingTracker implements ILSMOperationTracker { |
| private final AtomicInteger threadRefCount; |
| |
| public ThreadCountingTracker() { |
| this.threadRefCount = new AtomicInteger(); |
| } |
| |
| @Override |
| public void beforeOperation(ILSMIndex index, LSMOperationType opType, ISearchOperationCallback searchCallback, |
| IModificationOperationCallback modificationCallback) throws HyracksDataException { |
| if (opType == LSMOperationType.MODIFICATION) { |
| threadRefCount.incrementAndGet(); |
| } |
| } |
| |
| @Override |
| public void afterOperation(ILSMIndex index, LSMOperationType opType, ISearchOperationCallback searchCallback, |
| IModificationOperationCallback modificationCallback) throws HyracksDataException { |
| // The operation is considered inactive, immediately after leaving the index. |
| completeOperation(index, opType, searchCallback, modificationCallback); |
| } |
| |
| @Override |
| public void completeOperation(ILSMIndex index, LSMOperationType opType, ISearchOperationCallback searchCallback, |
| IModificationOperationCallback modificationCallback) throws HyracksDataException { |
| // Flush will only be handled by last exiting thread. |
| if (opType == LSMOperationType.MODIFICATION) { |
| if (threadRefCount.decrementAndGet() == 0 && index.getFlushStatus()) { |
| ILSMIndexAccessor accessor = (ILSMIndexAccessor) index.createAccessor(NoOpOperationCallback.INSTANCE, |
| NoOpOperationCallback.INSTANCE); |
| accessor.scheduleFlush(NoOpIOOperationCallback.INSTANCE); |
| } |
| } |
| } |
| } |