| /* |
| * Copyright 2009-2010 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.btree.impls; |
| |
| import java.util.Iterator; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleReference; |
| import edu.uci.ics.hyracks.dataflow.common.util.TupleUtils; |
| import edu.uci.ics.hyracks.storage.am.btree.api.IBTreeLeafFrame; |
| import edu.uci.ics.hyracks.storage.am.btree.impls.BTreeRangeSearchCursor; |
| import edu.uci.ics.hyracks.storage.am.btree.impls.RangePredicate; |
| import edu.uci.ics.hyracks.storage.am.common.api.ICursorInitialState; |
| import edu.uci.ics.hyracks.storage.am.common.api.IIndexAccessor; |
| import edu.uci.ics.hyracks.storage.am.common.api.ISearchOperationCallback; |
| import edu.uci.ics.hyracks.storage.am.common.api.ISearchPredicate; |
| import edu.uci.ics.hyracks.storage.am.common.api.IndexException; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexOperationContext; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BloomFilterAwareBTreePointSearchCursor; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMIndexSearchCursor; |
| |
| public class LSMBTreeRangeSearchCursor extends LSMIndexSearchCursor { |
| private final ArrayTupleReference copyTuple; |
| private final RangePredicate reusablePred; |
| |
| private ISearchOperationCallback searchCallback; |
| private RangePredicate predicate; |
| private IIndexAccessor memBTreeAccessor; |
| private ArrayTupleBuilder tupleBuilder; |
| |
| public LSMBTreeRangeSearchCursor(ILSMIndexOperationContext opCtx) { |
| super(opCtx); |
| this.copyTuple = new ArrayTupleReference(); |
| this.reusablePred = new RangePredicate(null, null, true, true, null, null); |
| } |
| |
| @Override |
| public boolean hasNext() throws HyracksDataException, IndexException { |
| checkPriorityQueue(); |
| PriorityQueueElement pqHead = outputPriorityQueue.peek(); |
| if (pqHead == null) { |
| // PQ is empty |
| return false; |
| } |
| |
| assert outputElement == null; |
| |
| if (searchCallback.proceed(pqHead.getTuple())) { |
| // if proceed is successful, then there's no need for doing the "unlatch dance" |
| return true; |
| } |
| |
| if (includeMemComponent) { |
| PriorityQueueElement inMemElement = null; |
| boolean inMemElementFound = false; |
| |
| // scan the PQ for the in-memory component's element |
| Iterator<PriorityQueueElement> it = outputPriorityQueue.iterator(); |
| while (it.hasNext()) { |
| inMemElement = it.next(); |
| if (inMemElement.getCursorIndex() == 0) { |
| inMemElementFound = true; |
| it.remove(); |
| break; |
| } |
| } |
| |
| if (!inMemElementFound) { |
| // the in-memory cursor is exhausted |
| searchCallback.reconcile(pqHead.getTuple()); |
| return true; |
| } |
| |
| // copy the in-mem tuple |
| if (tupleBuilder == null) { |
| tupleBuilder = new ArrayTupleBuilder(cmp.getKeyFieldCount()); |
| } |
| TupleUtils.copyTuple(tupleBuilder, inMemElement.getTuple(), cmp.getKeyFieldCount()); |
| copyTuple.reset(tupleBuilder.getFieldEndOffsets(), tupleBuilder.getByteArray()); |
| |
| // unlatch/unpin |
| rangeCursors[0].reset(); |
| |
| // reconcile |
| if (pqHead.getCursorIndex() == 0) { |
| searchCallback.reconcile(copyTuple); |
| } else { |
| searchCallback.reconcile(pqHead.getTuple()); |
| } |
| |
| // retraverse |
| reusablePred.setLowKey(copyTuple, true); |
| try { |
| memBTreeAccessor.search(rangeCursors[0], reusablePred); |
| } catch (IndexException e) { |
| throw new HyracksDataException(e); |
| } |
| |
| if (!pushIntoPriorityQueue(inMemElement)) { |
| return !outputPriorityQueue.isEmpty(); |
| } |
| |
| if (pqHead.getCursorIndex() == 0) { |
| if (cmp.compare(copyTuple, inMemElement.getTuple()) != 0) { |
| searchCallback.cancel(copyTuple); |
| } |
| } |
| checkPriorityQueue(); |
| } else { |
| searchCallback.reconcile(pqHead.getTuple()); |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public void open(ICursorInitialState initialState, ISearchPredicate searchPred) throws HyracksDataException { |
| LSMBTreeCursorInitialState lsmInitialState = (LSMBTreeCursorInitialState) initialState; |
| cmp = lsmInitialState.getOriginalKeyComparator(); |
| includeMemComponent = lsmInitialState.getIncludeMemComponent(); |
| operationalComponents = lsmInitialState.getOperationalComponents(); |
| lsmHarness = lsmInitialState.getLSMHarness(); |
| searchCallback = lsmInitialState.getSearchOperationCallback(); |
| memBTreeAccessor = lsmInitialState.getMemBTreeAccessor(); |
| predicate = (RangePredicate) lsmInitialState.getSearchPredicate(); |
| reusablePred.setLowKeyComparator(cmp); |
| reusablePred.setHighKey(predicate.getHighKey(), predicate.isHighKeyInclusive()); |
| reusablePred.setHighKeyComparator(predicate.getHighKeyComparator()); |
| |
| int numBTrees = lsmInitialState.getNumBTrees(); |
| rangeCursors = new BTreeRangeSearchCursor[numBTrees]; |
| if (lsmInitialState.isPointSearch()) { |
| int i = 0; |
| if (includeMemComponent) { |
| // No need for a bloom filter for the in-memory BTree. |
| IBTreeLeafFrame leafFrame = (IBTreeLeafFrame) lsmInitialState.getLeafFrameFactory().createFrame(); |
| rangeCursors[i] = new BTreeRangeSearchCursor(leafFrame, false); |
| ++i; |
| } |
| for (; i < numBTrees; i++) { |
| IBTreeLeafFrame leafFrame = (IBTreeLeafFrame) lsmInitialState.getLeafFrameFactory().createFrame(); |
| rangeCursors[i] = new BloomFilterAwareBTreePointSearchCursor(leafFrame, false, |
| ((LSMBTreeImmutableComponent) operationalComponents.get(i)).getBloomFilter()); |
| } |
| } else { |
| for (int i = 0; i < numBTrees; i++) { |
| IBTreeLeafFrame leafFrame = (IBTreeLeafFrame) lsmInitialState.getLeafFrameFactory().createFrame(); |
| rangeCursors[i] = new BTreeRangeSearchCursor(leafFrame, false); |
| } |
| } |
| |
| setPriorityQueueComparator(); |
| } |
| } |