| /* |
| * 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.freepage; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.storage.am.common.api.IInMemoryFreePageManager; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexMetaDataFrame; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexMetaDataFrameFactory; |
| |
| public class InMemoryFreePageManager implements IInMemoryFreePageManager { |
| protected final int capacity; |
| protected final AtomicInteger currentPageId = new AtomicInteger(); |
| protected final ITreeIndexMetaDataFrameFactory metaDataFrameFactory; |
| |
| public InMemoryFreePageManager(int capacity, ITreeIndexMetaDataFrameFactory metaDataFrameFactory) { |
| // We start the currentPageId from 1, because the BTree uses |
| // the first page as metadata page, and the second page as root page. |
| // (when returning free pages we first increment, then get) |
| currentPageId.set(1); |
| this.capacity = capacity; |
| this.metaDataFrameFactory = metaDataFrameFactory; |
| } |
| |
| @Override |
| public int getFreePage(ITreeIndexMetaDataFrame metaFrame) throws HyracksDataException { |
| // The very first call returns page id 2 because the BTree uses |
| // the first page as metadata page, and the second page as root page. |
| return currentPageId.incrementAndGet(); |
| } |
| |
| @Override |
| public int getMaxPage(ITreeIndexMetaDataFrame metaFrame) throws HyracksDataException { |
| return currentPageId.get(); |
| } |
| |
| @Override |
| public void init(ITreeIndexMetaDataFrame metaFrame, int currentMaxPage) throws HyracksDataException { |
| currentPageId.set(1); |
| } |
| |
| @Override |
| public ITreeIndexMetaDataFrameFactory getMetaDataFrameFactory() { |
| return metaDataFrameFactory; |
| } |
| |
| public int getCapacity() { |
| return capacity - 2; |
| } |
| |
| public void reset() { |
| currentPageId.set(1); |
| } |
| |
| public boolean isFull() { |
| return currentPageId.get() >= capacity; |
| } |
| |
| @Override |
| public void addFreePage(ITreeIndexMetaDataFrame metaFrame, int freePage) throws HyracksDataException { |
| } |
| |
| @Override |
| public byte getMetaPageLevelIndicator() { |
| return 0; |
| } |
| |
| @Override |
| public byte getFreePageLevelIndicator() { |
| return 0; |
| } |
| |
| @Override |
| public boolean isMetaPage(ITreeIndexMetaDataFrame metaFrame) { |
| return false; |
| } |
| |
| @Override |
| public boolean isFreePage(ITreeIndexMetaDataFrame metaFrame) { |
| return false; |
| } |
| |
| @Override |
| public int getFirstMetadataPage() { |
| // Method doesn't make sense for this free page manager. |
| return -1; |
| } |
| |
| @Override |
| public void open(int fileId) { |
| // Method doesn't make sense for this free page manager. |
| } |
| |
| @Override |
| public void close() { |
| // Method doesn't make sense for this free page manager. |
| } |
| } |