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ActiveMQ example source code file (HashPageInfo.java)

This example ActiveMQ source code file (HashPageInfo.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

hashentry, hashentry, hashindex, hashpage, hashpageinfo, hashpageinfo, io, ioexception, ioexception, linkednode, page, string, string

The ActiveMQ HashPageInfo.java source code

/**
 * 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;
    }
}

Other ActiveMQ examples (source code examples)

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