| /* |
| * 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.common.freepage; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexMetaDataFrame; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexMetaDataFrameFactory; |
| |
| /** |
| * In-memory free page manager that supports two tree indexes. |
| * We assume that the tree indexes have 2 fixed pages, one at index 0 (metadata page), and one at index 1 (root page). |
| */ |
| public class DualIndexInMemoryFreePageManager extends InMemoryFreePageManager { |
| |
| public DualIndexInMemoryFreePageManager(int capacity, ITreeIndexMetaDataFrameFactory metaDataFrameFactory) { |
| super(capacity, metaDataFrameFactory); |
| // We start the currentPageId from 3, because the RTree uses |
| // the first page as metadata page, and the second page as root page. |
| // And the BTree uses the third page as metadata, and the third page as root page |
| // (when returning free pages we first increment, then get) |
| currentPageId.set(3); |
| } |
| |
| @Override |
| public void init(ITreeIndexMetaDataFrame metaFrame, int currentMaxPage) throws HyracksDataException { |
| currentPageId.set(3); |
| } |
| |
| public int getCapacity() { |
| return capacity - 4; |
| } |
| |
| public void reset() { |
| currentPageId.set(3); |
| } |
| } |