dbinvoke.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: DbInvoke.java,v 1.5 2002/09/18 06:54:15 per_nyfelt Exp $

package org.ozoneDB.core.DbRemote;

import org.ozoneDB.OzoneProxy;
import org.ozoneDB.core.ResultConverter;
import org.ozoneDB.core.Transaction;

import java.io.*;


/**
 * @author <a href="http://www.softwarebuero.de/">SMB</a>
 * @version $Revision: 1.5 $Date: 2002/09/18 06:54:15 $
 */
public final class DbInvoke extends DbCommand implements Externalizable {

    private OzoneProxy obj;

    private int methodIndex = -1;

    private String methodName;

    private String sig;

    private Object[] args;

    private int lockLevel;


    public DbInvoke() {
    }


    public DbInvoke( OzoneProxy _obj, int _methodIndex, Object[] _args, int _lockLevel ) {
        obj = _obj;
        methodIndex = _methodIndex;
        args = _args;
        lockLevel = _lockLevel;
    }


    public DbInvoke( OzoneProxy _obj, String method, String _sig, Object[] _args, int _lockLevel ) {
        obj = _obj;
        methodName = method;
        sig = _sig;
        args = _args;
        lockLevel = _lockLevel;
    }


    public void perform( Transaction ta ) throws Exception {
        env.logWriter.newEntry (this, "DbInvoke.perform(): start.", env.logWriter.DEBUG2);
        // result = env.database.invoke (obj, methodName, sig, args, update);

        try {
            if (methodIndex > -1) {
                result = ta.invokeObject( obj.remoteID(), methodIndex, args, lockLevel );
            } else {
                result = ta.invokeObject( obj.remoteID(), methodName, sig, args, lockLevel );
            }

            result = ResultConverter.substituteOzoneCompatibles(result,getProxyObjectGate());
        } finally {
            env.logWriter.newEntry (this, "DbInvoke.perform(): end.", env.logWriter.DEBUG2);
        }
    }


    public void writeExternal( ObjectOutput out ) throws IOException {
        out.writeObject( obj );
        out.writeInt( methodIndex );
        if (methodIndex == -1) {
            out.writeObject( methodName );
            out.writeObject( sig );
        }
        out.writeObject( args );
        out.writeInt( lockLevel );
    }


    public void readExternal( ObjectInput in ) throws IOException, ClassNotFoundException {
        obj = (OzoneProxy)in.readObject();
        methodIndex = in.readInt();
        if (methodIndex == -1) {
            methodName = (String)in.readObject();
            sig = (String)in.readObject();
        }
        args = (Object[])in.readObject();
        lockLevel = in.readInt();
    }


    public String toString() {
        if (methodIndex > -1) {
            return "[" + "DbInvoke: " + methodIndex + "]";
        } else {
            return "[" + "DbInvoke: " + methodName + "]";
        }
    }
}