| /* |
| * 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.impls; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.storage.am.common.api.IndexException; |
| 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.ILSMMergePolicy; |
| |
| public class ConstantMergePolicy implements ILSMMergePolicy { |
| |
| private final int threshold; |
| |
| public ConstantMergePolicy(int threshold) { |
| this.threshold = threshold; |
| } |
| |
| @Override |
| public void diskComponentAdded(final ILSMIndex index, int totalNumDiskComponents) throws HyracksDataException, |
| IndexException { |
| if (totalNumDiskComponents >= threshold) { |
| ILSMIndexAccessor accessor = (ILSMIndexAccessor) index.createAccessor(NoOpOperationCallback.INSTANCE, |
| NoOpOperationCallback.INSTANCE); |
| accessor.scheduleMerge(NoOpIOOperationCallback.INSTANCE); |
| } |
| } |
| } |