querycachekey.java

来自「Jive是基于JSP/JAVA技术构架的一个大型BBS论坛系统,这是Jive论坛」· Java 代码 · 共 129 行

/**
 * $RCSfile: QueryCacheKey.java,v $
 * $Revision: 1.1 $
 * $Date: 2002/05/10 22:20:01 $
 *
 * Copyright 1999-2002 CoolServlets, Inc. All Rights Reserved.
 *
 * This software is the proprietary information of CoolServlets, Inc.
 * Use is subject to license terms.
 */

package com.jivesoftware.forum.database;

import com.jivesoftware.forum.*;
import com.jivesoftware.util.*;

/**
 * Represents a key in the QueryCache. All information needed to reload a
 * cache entry is included in the key.
 */
public class QueryCacheKey implements java.io.Serializable, Cacheable  {

    int objectType;
    long objectID;
    String sql;
    int blockID;

    /**
     * Creates a new QueryCacheKey.
     *
     * @param objectType the type of the object: JiveGlobals.FORUM_CATEGORY,
     *      JiveGlobals.FORUM, or JiveGlobals.THREAD.
     * @param objectID the id of the parent object to which the query cache
     *      entry corresponds.
     * @param sql the sql query for the cache entry data.
     * @param blockID the blockID of the entry.
     */
    public QueryCacheKey(int objectType, long objectID, String sql, int blockID) {
        this.objectType = objectType;
        this.objectID = objectID;
        this.sql = sql;
        this.blockID = blockID;
    }

    public boolean equals(Object obj) {
        if (this == obj) {
             return true;
        }
        else {
            QueryCacheKey otherKey = (QueryCacheKey)obj;
            return (objectType == otherKey.getObjectType() &&
                    objectID == otherKey.getObjectID() &&
                    blockID == otherKey.getBlockID() &&
                    sql.equals(otherKey.getSql()));
        }
    }

    public int hashCode() {
        return objectType + (int)objectID + sql.hashCode() + blockID;
    }

    public String toString() {
        StringBuffer result = new StringBuffer();
        switch (objectType) {
            case JiveGlobals.FORUM_CATEGORY:
                result.append("Category ");
                break;
            case JiveGlobals.FORUM:
                result.append("Forum ");
                break;
            case JiveGlobals.THREAD:
                result.append("Thread ");
        }
        result.append(objectID).append(": ");
        result.append(sql);
        if (blockID != -1) {
            result.append(", ").append(blockID);
        }
        return result.toString();
    }

    /**
     * Returns the object type associated with the objectID. Possible values are
     * JiveGlobals.FORUM_CATEGORY, JiveGlobals.FORUM, and JiveGlobals.THREAD.
     *
     * @return the object type..
     */
    public int getObjectType() {
        return objectType;
    }

    /**
     * Returns the objectID of the key.
     *
     * @return the objectID.
     */
    public long getObjectID() {
        return objectID;
    }

    /**
     * Returns the sql query of the key.
     *
     * @return the sql.
     */
    public String getSql() {
        return sql;
    }

    /**
     * Returns the blockID of the key, or -1 if there is not a blockID.
     *
     * @return the blockID, or -1 if not a blockID.
     */
    public int getBlockID() {
        return blockID;
    }

    public int getCachedSize() {
        int size = 0;
        size += CacheSizes.sizeOfObject();              // overhead of object
        size += CacheSizes.sizeOfInt();                 // object type
        size += CacheSizes.sizeOfLong();                // object id
        size += CacheSizes.sizeOfString(sql);           // sql
        size += CacheSizes.sizeOfInt();                 // blockID
        return size;
    }
}