@Override
public void open(ICursorInitialState initialState, ISearchPredicate searchPred)
throws HyracksDataException, IndexException {
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 IIndexCursor[numBTrees];
for (int i = 0; i < numBTrees; i++) {
IBTreeLeafFrame leafFrame =
(IBTreeLeafFrame) lsmInitialState.getLeafFrameFactory().createFrame();
rangeCursors[i] = new BTreeRangeSearchCursor(leafFrame, false);
}
setPriorityQueueComparator();
int cursorIx = 0;
ListIterator<ILSMComponent> btreesIter = operationalComponents.listIterator();
if (includeMemComponent) {
// Open cursor of in-memory BTree at index 0.
memBTreeAccessor.search(rangeCursors[cursorIx], searchPred);
// Skip 0 because it is the in-memory BTree.
++cursorIx;
btreesIter.next();
}
// Open cursors of on-disk BTrees.
int numDiskComponents = includeMemComponent ? numBTrees - 1 : numBTrees;
ITreeIndexAccessor[] diskBTreeAccessors = new ITreeIndexAccessor[numDiskComponents];
int diskBTreeIx = 0;
while (btreesIter.hasNext()) {
BTree diskBTree = (BTree) ((LSMBTreeImmutableComponent) btreesIter.next()).getBTree();
diskBTreeAccessors[diskBTreeIx] =
diskBTree.createAccessor(NoOpOperationCallback.INSTANCE, NoOpOperationCallback.INSTANCE);
diskBTreeAccessors[diskBTreeIx].search(rangeCursors[cursorIx], searchPred);
cursorIx++;
diskBTreeIx++;
}
initPriorityQueue();
proceed = true;
}
@Override
public void open(ICursorInitialState initialState, ISearchPredicate searchPred)
throws HyracksDataException {
LSMBTreeCursorInitialState lsmInitialState = (LSMBTreeCursorInitialState) initialState;
operationalComponents = lsmInitialState.getOperationalComponents();
lsmHarness = lsmInitialState.getLSMHarness();
searchCallback = lsmInitialState.getSearchOperationCallback();
predicate = (RangePredicate) lsmInitialState.getSearchPredicate();
numBTrees = operationalComponents.size();
if (rangeCursors == null || rangeCursors.length != numBTrees) {
// object creation: should be relatively low
rangeCursors = new BTreeRangeSearchCursor[numBTrees];
btreeAccessors = new BTreeAccessor[numBTrees];
}
includeMutableComponent = false;
for (int i = 0; i < numBTrees; i++) {
ILSMComponent component = operationalComponents.get(i);
BTree btree;
if (component.getType() == LSMComponentType.MEMORY) {
includeMutableComponent = true;
// No need for a bloom filter for the in-memory BTree.
if (rangeCursors[i] == null || rangeCursors[i].isBloomFilterAware()) {
// create a new one
IBTreeLeafFrame leafFrame =
(IBTreeLeafFrame) lsmInitialState.getLeafFrameFactory().createFrame();
rangeCursors[i] = new BTreeRangeSearchCursor(leafFrame, false);
} else {
// reset
rangeCursors[i].reset();
}
btree = ((LSMBTreeMemoryComponent) component).getBTree();
} else {
if (rangeCursors[i] != null && rangeCursors[i].isBloomFilterAware()) {
// can re-use cursor
((BloomFilterAwareBTreePointSearchCursor) rangeCursors[i])
.resetBloomFilter(((LSMBTreeDiskComponent) component).getBloomFilter());
rangeCursors[i].reset();
} else {
// create new cursor <should be relatively rare>
IBTreeLeafFrame leafFrame =
(IBTreeLeafFrame) lsmInitialState.getLeafFrameFactory().createFrame();
rangeCursors[i] =
new BloomFilterAwareBTreePointSearchCursor(
leafFrame, false, ((LSMBTreeDiskComponent) component).getBloomFilter());
}
btree = ((LSMBTreeDiskComponent) component).getBTree();
}
if (btreeAccessors[i] == null) {
btreeAccessors[i] =
(BTreeAccessor)
btree.createAccessor(
NoOpOperationCallback.INSTANCE, NoOpOperationCallback.INSTANCE);
} else {
// re-use
btreeAccessors[i].reset(
btree, NoOpOperationCallback.INSTANCE, NoOpOperationCallback.INSTANCE);
}
}
nextHasBeenCalled = false;
foundTuple = false;
}