| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 at |
| * |
| * 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 org.apache.activemq.kaha.impl.index.hash; |
| |
| import java.io.IOException; |
| import org.apache.activemq.util.LinkedNode; |
| |
| /** |
| * A Page within a HashPageInfo |
| * |
| * |
| */ |
| class HashPageInfo extends LinkedNode{ |
| |
| private HashIndex hashIndex; |
| private long id; |
| private int size; |
| private HashPage page; |
| private boolean dirty; |
| |
| HashPageInfo(HashIndex index) { |
| this.hashIndex = index; |
| } |
| |
| /** |
| * @return the id |
| */ |
| long getId() { |
| return this.id; |
| } |
| |
| /** |
| * @param id the id to set |
| */ |
| void setId(long id) { |
| this.id = id; |
| } |
| |
| /** |
| * @return the size |
| */ |
| int size() { |
| return this.size; |
| } |
| |
| boolean isEmpty() { |
| return size <= 0; |
| } |
| |
| /** |
| * @param size the size to set |
| */ |
| void setSize(int size) { |
| this.size = size; |
| } |
| |
| void addHashEntry(int index, HashEntry entry) throws IOException { |
| page.addHashEntry(index, entry); |
| size=page.size(); |
| dirty = true; |
| } |
| |
| HashEntry getHashEntry(int index) throws IOException { |
| return page.getHashEntry(index); |
| } |
| |
| HashEntry removeHashEntry(int index) throws IOException { |
| HashEntry result = page.removeHashEntry(index); |
| if (result != null) { |
| size=page.size(); |
| dirty = true; |
| } |
| return result; |
| } |
| |
| String dump() { |
| return page.dump(); |
| } |
| |
| void begin() throws IOException { |
| if (page == null) { |
| page = hashIndex.lookupPage(id); |
| } |
| } |
| |
| void end() throws IOException { |
| if (page != null) { |
| if (dirty) { |
| hashIndex.writeFullPage(page); |
| } |
| } |
| page = null; |
| dirty = false; |
| } |
| |
| HashPage getPage() { |
| return page; |
| } |
| |
| void setPage(HashPage page) { |
| this.page = page; |
| } |
| |
| public String toString() { |
| return "Page["+id+"] size=" + size; |
| } |
| } |