transactioncanvas.java

用Java写的面相对象的数据库管理系统

//$Id: TransactionCanvas.java,v 1.2 2000/10/28 16:55:18 daniela Exp $

package org.ozoneDB.core.monitor;

import org.ozoneDB.DxLib.*;
import java.awt.*;
import java.awt.event.*;


public class TransactionCanvas extends Canvas {
    static Color createColor = new Color( 255, 150, 80 );
    static Color readColor = new Color( 176, 196, 222 );
    static Color writeColor = new Color( 123, 104, 238 );
    
    private Graphics dbg;
    private Image dbImage;
    
    
    /** */
    public TransactionCanvas() {
        setBackground( StorageCanvas.bg1Color );
    }
    
    
    /** */
    public void update( Graphics g ) {
        if (dbImage == null) {
            /* BUG 0: deprecated function: size() */
            dbImage = createImage( size().width, size().height );
            dbg = dbImage.getGraphics();
        } 
        paint( dbg );
        g.drawImage( dbImage, 0, 0, this );
    } 
    
    
    /** */
    public void paint( Graphics g ) {
        super.paint( g );
        Rectangle rect = getBounds();
        
        g.setColor( StorageCanvas.bg1Color );
        g.fillRect( 1, 1, rect.width - 2, rect.height - 2 );
        g.draw3DRect( 1, 1, rect.width - 2, rect.height - 2, true );
        g.setColor( StorageCanvas.headColor );
        g.fillRect( 3, 3, rect.width - 5, 13 );
        g.setColor( Color.white );
        g.drawString( "Transaction View", 6, 13 );
        
        int viewHeight = (rect.height - 60) / 3;
        Rectangle osRect = new Rectangle( 10, rect.height - viewHeight * 3 - 40, rect.width - 20, viewHeight );
        updateCV( g, osRect );
        Rectangle csRect = new Rectangle( 10, rect.height - viewHeight * 2 - 25, rect.width - 20, viewHeight );
        updateBV( g, csRect );
        Rectangle psRect = new Rectangle( 10, rect.height - viewHeight - 10, rect.width - 20, viewHeight );
        updateTV( g, psRect );
    } 
    
    
    /** */
    public void updateTV( Graphics g, Rectangle r ) {
        TransactionManager tam = Env.currentEnv().transactionManager;
        
        g.setColor( StorageCanvas.bgColor );
        g.fillRect( r.x, r.y + 14, r.width, r.height - 14 );
        g.draw3DRect( r.x, r.y + 14, r.width, r.height - 14, false );
        
        int read = 0;
        int write = 0;
        int create = 0;
        int viewW = r.width / 4;
        DxIterator it = tam.taTable.iterator();
        for (int i = 0; i < 4; i++) {
            if (i > 0) {
                g.setColor( StorageCanvas.bgColor );
                g.draw3DRect( r.x + viewW * i - 1, r.y + 14, 1, r.height - 14, true );
            } 
            Transaction ta = (Transaction)it.next();
            if (ta != null && ta.createTable != null) {
                Rectangle taRect = new Rectangle( r.x + viewW * i + 1, r.y + 14 + 1, viewW, r.height - 14 - 1 );
                updateTA( g, taRect, ta );
                
                create += ta.createTable.count();
                read += ta.readTable.count();
                write += ta.writeTable.count();
            } 
        } 
        
        g.setColor( StorageCanvas.fontColor );
        String label = 
                "Object access - " + new Integer( tam.taTable.count() ).toString() + " transactions  [ " + new Integer(
                create ).toString() + " / " + new Integer( read ).toString() + " / " + new Integer( write ).toString() 
                + " ]";
        g.drawString( label, r.x, r.y + 12 );
    } 
    
    
    /** */
    public void updateTA( Graphics g, Rectangle r, Transaction ta ) {
        int max = ta.createTable.count();
        max = Math.max( max, ta.readTable.count() );
        max = Math.max( max, ta.writeTable.count() );
        
        int scale = 1;
        while (max / scale > r.height) {
            scale++;
        } 
        
        int bw = r.width / 3;
        int bh = ta.createTable.count() / scale;
        g.setColor( createColor );
        g.fillRect( r.x, r.y + r.height - bh, bw, bh );
        bh = ta.readTable.count() / scale;
        g.setColor( readColor );
        g.fillRect( r.x + bw, r.y + r.height - bh, bw, bh );
        bh = ta.writeTable.count() / scale;
        g.setColor( writeColor );
        g.fillRect( r.x + bw * 2, r.y + r.height - bh, bw, bh );
    } 
    
    
    /** */
    public void updateBV( Graphics g, Rectangle r ) {
        TransactionManager tam = Env.currentEnv().transactionManager;
        
        g.setColor( StorageCanvas.bgColor );
        g.fillRect( r.x, r.y + 14, r.width, r.height - 14 );
        g.draw3DRect( r.x, r.y + 14, r.width, r.height - 14, false );
        g.setColor( StorageCanvas.fontColor );
        String label = "Blocking";
        g.drawString( label, r.x, r.y + 12 );
        
        int y = r.y + 14 + 14;
        int x = r.x + 5;
        g.setColor( StorageCanvas.fontColor );
        if (tam.taTable.isEmpty()) {
            g.drawString( "No transactions.", x, y );
        } else {
            boolean somethingBlocked = false;
            DxIterator it = tam.taTable.iterator();
            Transaction ta;
            while ((ta = (Transaction)it.next()) != null) {
                if (ta.blocker != null) {
                    somethingBlocked = true;
                    Transaction blocker = Env.currentEnv().objectSpace.objectForID( ta.blocker ).writeLocker;
                    g.drawString( new Short( (short)ta.taID.hashCode() ).toString() + " blocked by " + new Short(
                            (short)blocker.taID.hashCode() ).toString(), x, y );
                    y += 14;
                } 
            } 
            if (!somethingBlocked) {
                g.drawString( "No transaction blocked.", x, y );
            } 
        } 
    } 
    
    
    /** */
    public void updateCV( Graphics g, Rectangle r ) {
        TransactionManager tam = Env.currentEnv().transactionManager;
        
        g.setColor( StorageCanvas.bgColor );
        g.fillRect( r.x, r.y + 14, r.width, r.height - 14 );
        g.draw3DRect( r.x, r.y + 14, r.width, r.height - 14, false );
        g.setColor( StorageCanvas.fontColor );
        String label = "Clients - ";
        g.drawString( label, r.x, r.y + 12 );
    } 
}