430-final-project/Test4.java at main · xsfa/430-final-project · GitHub

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import java.util.Date;
import java.util.Random;

class Test4 extends Thread {
    private boolean enabled;
    private int testcase;
    private long startTime;
    private long endTime;
    private byte[] wbytes;
    private byte[] rbytes;
    private Random rand;

    private void getPerformance( String msg ) {
	if ( enabled == true )
	    SysLib.cout( "Test " + msg + "(cache enabled): "
			 + (endTime - startTime) + "\n" );
	else
	    SysLib.cout( "Test " + msg + "(cache disabled): "
			 + (endTime - startTime) + "\n" );
    }

    private void read( int blk, byte[] bytes ) {
	if ( enabled == true )
	    SysLib.cread( blk, bytes );
	else
	    SysLib.rawread( blk, bytes );
    }

    private void write( int blk, byte[] bytes ) {
	if ( enabled == true )
	    SysLib.cwrite( blk, bytes );
	else
	    SysLib.rawwrite( blk, bytes );
    }

    private void randomAccess( ) {
	int[] accesses = new int[200];
	for ( int i = 0; i < 200; i++ ) {
	    accesses[i] = Math.abs(rand.nextInt( ) % 512);
	    // SysLib.cout( accesses[i] + " " );
	}
	// SysLib.cout( "\n" );
	for ( int i = 0; i < 200; i++ ) {
	    for ( int j = 0; j < 512; j++ )
		wbytes[j] = (byte)(j);
	    write( accesses[i], wbytes );
	}
	for ( int i = 0; i < 200; i++ ) {
	    read( accesses[i], rbytes );
	    for ( int k = 0; k < 512; k++ ) {
		if ( rbytes[k] != wbytes[k] ) {
		    SysLib.cerr( "ERROR\n" );
		    SysLib.exit( );
		}
	    }
	}
    }

    private void localizedAccess( ) {
	for ( int i = 0; i < 20; i++ ) {
	    for ( int j = 0; j < 512; j++ )
		wbytes[j] = (byte)(i + j);
	    for ( int j = 0; j < 1000; j += 100 )
		write( j, wbytes );
	    for ( int j = 0; j < 1000; j += 100 ) {
		read( j, rbytes );
		for ( int k = 0; k < 512; k++ ) {
		    if ( rbytes[k] != wbytes[k] ) {
			SysLib.cerr( "ERROR\n" );
			SysLib.exit( );
		    }
		}
	    }
	}
    }

    private void mixedAccess( ) {
	int[] accesses = new int[200];
	for ( int i = 0; i < 200; i++ ) {
	    if ( Math.abs( rand.nextInt( ) % 10 ) > 8 ) {
		// random
		accesses[i] = Math.abs( rand.nextInt( ) % 512 );
	    } else {
		// localized
		accesses[i] = Math.abs( rand.nextInt( ) % 10 );
	    }
	}
	for ( int i = 0; i < 200; i++ ) {
	    for ( int j = 0; j < 512; j++ )
		wbytes[j] = (byte)(j);
	    write( accesses[i], wbytes );
	}
	for ( int i = 0; i < 200; i++ ) {
	    read( accesses[i], rbytes );
	    for ( int k = 0; k < 512; k++ ) {
		if ( rbytes[k] != wbytes[k] ) {
		    SysLib.cerr( "ERROR\n" );
		    SysLib.exit( );
		}
	    }
	}
    }

    private void adversaryAccess( ) {
	int[] accesses = new int[200];
	for ( int i = 0; i < 200; i++ )
	    accesses[i] = ( i % 2 == 0 ) ? i : i + 256;

	for ( int i = 0; i < 200; i++ ) {
	    for ( int j = 0; j < 512; j++ )
		wbytes[j] = (byte)(j);
	    write( accesses[i], wbytes );
	}
	for ( int i = 0; i < 200; i++ ) {
	    read( accesses[i], rbytes );
	    for ( int k = 0; k < 512; k++ ) {
		if ( rbytes[k] != wbytes[k] ) {
		    SysLib.cerr( "ERROR\n" );
		    SysLib.exit( );
		}
	    }
	}
    }


    public Test4( String[] args ) {
	enabled = args[0].equals( "enabled" ) ? true : false;
	testcase = Integer.parseInt( args[1] );
	wbytes = new byte[Disk.blockSize];
	rbytes = new byte[Disk.blockSize];
	rand = new Random( );
    }

    public void run( ) {
	SysLib.flush( );
	startTime = new Date( ).getTime( );
	switch ( testcase ) {
	case 1:
	    randomAccess( );
	    endTime = new Date( ).getTime( );
	    getPerformance( "random accesses" );
	    break;
	case 2:
	    localizedAccess( );
	    endTime = new Date( ).getTime( );
	    getPerformance( "localized accesses" );
	    break;
	case 3:
	    mixedAccess( );
	    endTime = new Date( ).getTime( );
	    getPerformance( "mixed accesses" );
	    break;
	case 4:
	    adversaryAccess( );
	    endTime = new Date( ).getTime( );
	    getPerformance( "adversary accesses" );
	    break;
	case 5:
	    randomAccess( );
	    endTime = new Date( ).getTime( );
	    getPerformance( "random accesses" );

	    startTime = new Date( ).getTime( );
	    localizedAccess( );
	    endTime = new Date( ).getTime( );
	    getPerformance( "localized accesses" );

	    startTime = new Date( ).getTime( );
	    mixedAccess( );
	    endTime = new Date( ).getTime( );
	    getPerformance( "mixed accesses" );

	    startTime = new Date( ).getTime( );
	    adversaryAccess( );
	    endTime = new Date( ).getTime( );
	    getPerformance( "adversary accesses" );
	    break;
	}
	SysLib.exit( );
    }
}