wizardtransaction.java

Java的面向对象数据库系统的源代码

// You can redistribute this software and/or modify it under the terms of
// the Ozone Core License version 1 published by ozone-db.org.
//
// The original code and portions created by SMB are
// Copyright (C) 1997-@year@ by SMB GmbH. All rights reserved.
//
// $Id$

package org.ozoneDB.core.storage.wizardStore;

import org.ozoneDB.DxLib.DxDeque;
import org.ozoneDB.DxLib.DxHashMap;
import org.ozoneDB.DxLib.DxListDeque;
import org.ozoneDB.DxLib.DxMap;
import org.ozoneDB.DxLib.DxSet;
import org.ozoneDB.core.Env;
import org.ozoneDB.core.Transaction;
import org.ozoneDB.core.TransactionID;
import org.ozoneDB.core.User;
import org.ozoneDB.core.storage.wizardStore.IDTableChange;
import org.ozoneDB.core.storage.wizardStore.NameTableChange;
import org.ozoneDB.core.storage.ClusterID;

/**
 * @version $Id $
 */
public class WizardTransaction extends Transaction {
    
    public final static int DEFAULT_TABLE_SIZE = 1024;

    protected ClusterID lrucid;

    protected DxMap idTable;

    // initialized by WizardStore.nameContainer() if needed
    protected DxMap nameTable;

    protected DxSet commitClusterIDs;

    private DxDeque idTableChanges;

    private DxDeque nameTableChanges;

    public WizardTransaction(Env env, User owner) {
        super(env, owner);
        idTable = new DxHashMap(DEFAULT_TABLE_SIZE);
    }

    /**
     * Construct a new transaction. THIS TRANSACTION CAN BE USED FOR TESTING
     * ONLY!
     */
    public WizardTransaction(TransactionID _taID) {
        super(_taID);
        idTable = new DxHashMap(DEFAULT_TABLE_SIZE);
    }


    public void nameTableChanges_push(NameTableChange change) {
        if (nameTableChanges == null) {
            nameTableChanges = new DxListDeque(/*DEFAULT_TABLE_SIZE*/);
        }
        nameTableChanges.pushTop(change);
    }


    public NameTableChange nameTableChanges_pop() {
        return nameTableChanges != null ? (NameTableChange) nameTableChanges.popBottom() : null;
    }


    public void idTableChanges_push(IDTableChange change) {
        if (idTableChanges == null) {
            idTableChanges = new DxListDeque(/*DEFAULT_TABLE_SIZE*/);
        }
        idTableChanges.pushTop(change);
    }


    public IDTableChange idTableChanges_pop() {
        return idTableChanges != null ? (IDTableChange) idTableChanges.popBottom() : null;
    }

}