root / trunk / libraries / libRaster / tmp / cache2 / RasterCache2.java @ 10740
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2006 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*/
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package org.gvsig.raster.dataaccess.cache2; |
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import java.io.IOException; |
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import org.gvsig.raster.dataaccess.buffer.IBand; |
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import org.gvsig.raster.dataaccess.buffer.RasterBand; |
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import org.gvsig.raster.dataaccess.buffer.RasterBuffer; |
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import org.gvsig.raster.dataaccess.cache.Cache; |
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import org.gvsig.raster.dataaccess.cache.CacheDataServer; |
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import org.gvsig.raster.dataaccess.cache.InvalidPageNumberException; |
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import org.gvsig.raster.driver.IBuffer; |
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/*
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* TODO: OPTIMIZACION: Trabajo de optimizaci?n en la velocidad e acceso a cach?.
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* TODO: FUNCIONALIDAD: Acabar de implementar los m?todos de acceso a datos, intercambio de bandas, etc...
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*/
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/**
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* Esta clase representa un buffer de datos cacheado. El estar en cache significa que
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* solo una parte de los datos estar?n en memoria y que gestiona, dependiendo de las
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* peticiones, que partes hay que cargar a memoria y en que momento. Para esto el buffer
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* no se llena de golpe sino que utiliza una clase que sirve los datos desde la fuente.
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* Esta clase servidora de datos debe implementar el interfaz ICacheDatasetSourcepara
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* servir datos de la forma requerida.
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*
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*
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*/
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public class RasterCache2 extends RasterBuffer implements IBuffer { |
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private MultiBandCache cache = null; |
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/**
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*
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*
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*/
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public class CacheBand extends RasterBand{ |
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private Cache cache = null; |
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public CacheBand(int height, int width, boolean malloc){ |
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super(height, width);
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cache = new Cache(1, dataType, height, width); |
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cache.setDataSource(new CacheDataServer());
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} |
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public Object getLine(int line) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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switch(dataType){
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case IBuffer.TYPE_BYTE: return cache.getAccessPage().getLineByte((line & cache.getOffset()))[0]; |
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case IBuffer.TYPE_SHORT: return cache.getAccessPage().getLineShort((line & cache.getOffset()))[0]; |
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case IBuffer.TYPE_INT: return cache.getAccessPage().getLineInt((line & cache.getOffset()))[0]; |
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case IBuffer.TYPE_FLOAT: return cache.getAccessPage().getLineFloat((line & cache.getOffset()))[0]; |
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case IBuffer.TYPE_DOUBLE: return cache.getAccessPage().getLineDouble((line & cache.getOffset()))[0]; |
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} |
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return null; |
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} |
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public void setLine(int line, Object value){ |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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switch(dataType){
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case IBuffer.TYPE_BYTE: byte[][] bLine = new byte[1][]; |
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bLine[0] = (byte[])value; |
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cache.getAccessPage().setLineByte(bLine, (line & cache.getOffset())); |
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break;
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case IBuffer.TYPE_SHORT:short[][] sLine = new short[1][]; |
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sLine[0] = (short[])value; |
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cache.getAccessPage().setLineShort(sLine, (line & cache.getOffset())); |
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break;
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case IBuffer.TYPE_INT: int[][] iLine = new int[1][]; |
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iLine[0] = (int[])value; |
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cache.getAccessPage().setLineInt(iLine, (line & cache.getOffset())); |
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break;
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case IBuffer.TYPE_FLOAT:float[][] fLine = new float[1][]; |
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fLine[0] = (float[])value; |
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cache.getAccessPage().setLineFloat(fLine, (line & cache.getOffset())); |
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break;
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case IBuffer.TYPE_DOUBLE: double[][] dLine = new double[1][]; |
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dLine[0] = (double[])value; |
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cache.getAccessPage().setLineDouble(dLine, (line & cache.getOffset())); |
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break;
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} |
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} |
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public Object getBuf(){ |
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return cache;
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} |
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} |
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/**
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* Constructor. Asigna las variables de inicializaci?n y crea la estructura de
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* la cach? con los datos pasados.
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* @param dataType Tipo de dato
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* @param width Ancho
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* @param height Alto
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* @param bandNr Banda
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* @param orig
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*/
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public RasterCache2(int dataType, int width, int height, int nBand){ |
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cache = new MultiBandCache(dataType, width, height, nBand);
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this.dataType = dataType;
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this.width = width;
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this.height = height;
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this.nBands = nBand;
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} |
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public void malloc(int dataType, int width, int height, int bandNr) { |
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} |
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/**
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* Obtiene la cach? de cada banda
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* @return
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*/
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public MultiBandCache getCacheList() {
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return cache;
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} |
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//*********************************************************
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public byte[][] getLineByte(int line) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineByte((line & cache.getOffset()));
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} |
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public short[][] getLineShort(int line) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineShort((line & cache.getOffset()));
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} |
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public int[][] getLineInt(int line) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineInt((line & cache.getOffset()));
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} |
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public float[][] getLineFloat(int line) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineFloat((line & cache.getOffset()));
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} |
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public double[][] getLineDouble(int line) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineDouble((line & cache.getOffset()));
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} |
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//*********************************************************
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public void setLineByte(byte[][] data, int line) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineByte(data, (line & cache.getOffset())); |
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} |
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public void setLineShort(short[][] data, int line) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineShort(data, (line & cache.getOffset())); |
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} |
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public void setLineInt(int[][] data, int line) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineInt(data, (line & cache.getOffset())); |
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} |
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public void setLineFloat(float[][] data, int line) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineFloat(data, (line & cache.getOffset())); |
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} |
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public void setLineDouble(double[][] data, int line) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineDouble(data, (line & cache.getOffset())); |
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} |
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//*********************************************************
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public byte[] getLineFromBandByte(int line, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineFromBandByte((line & cache.getOffset()), band);
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} |
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public short[] getLineFromBandShort(int line, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineFromBandShort((line & cache.getOffset()), band);
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} |
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public int[] getLineFromBandInt(int line, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineFromBandInt((line & cache.getOffset()), band);
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} |
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public float[] getLineFromBandFloat(int line, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineFromBandFloat((line & cache.getOffset()), band);
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} |
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public double[] getLineFromBandDouble(int line, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {return null;} |
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return cache.getAccessPage().getLineFromBandDouble((line & cache.getOffset()), band);
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} |
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//*********************************************************
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public void setLineInBandByte(byte[] data, int line, int band) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineInBandByte(data, (line & cache.getOffset()), band); |
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} |
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public void setLineInBandShort(short[] data, int line, int band) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineInBandShort(data, (line & cache.getOffset()), band); |
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} |
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public void setLineInBandInt(int[] data, int line, int band) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineInBandInt(data, (line & cache.getOffset()), band); |
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} |
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public void setLineInBandFloat(float[] data, int line, int band) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineInBandFloat(data, (line & cache.getOffset()), band); |
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} |
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public void setLineInBandDouble(double[] data, int line, int band) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setLineInBandDouble(data, (line & cache.getOffset()), band); |
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} |
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//*********************************************************
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public byte getElemByte(int line, int col, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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return (byte)getNoDataValue(); //No leemos el dato |
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} |
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return cache.getAccessPage().getElemByte((line & cache.getOffset()), col, band);
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} |
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public short getElemShort(int line, int col, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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return (short)getNoDataValue(); //No leemos el dato |
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} |
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return cache.getAccessPage().getElemShort((line & cache.getOffset()), col, band);
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} |
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public int getElemInt(int line, int col, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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return (int)getNoDataValue(); //No leemos el dato |
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} |
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return cache.getAccessPage().getElemInt((line & cache.getOffset()), col, band);
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} |
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public float getElemFloat(int line, int col, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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return (float)getNoDataValue(); //No leemos el dato |
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} |
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return cache.getAccessPage().getElemFloat((line & cache.getOffset()), col, band);
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} |
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public double getElemDouble(int line, int col, int band) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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return (double)getNoDataValue(); //No leemos el dato |
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} |
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return cache.getAccessPage().getElemDouble((line & cache.getOffset()), col, band);
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} |
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//*********************************************************
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public void setElem(int line, int col, int band, byte data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) { return;} |
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cache.getAccessPage().setElem((line & cache.getOffset()), col, band, data); |
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} |
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public void setElem(int line, int col, int band, short data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElem((line & cache.getOffset()), col, band, data); |
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} |
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public void setElem(int line, int col, int band, int data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElem((line & cache.getOffset()), col, band, data); |
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} |
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public void setElem(int line, int col, int band, float data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElem((line & cache.getOffset()), col, band, data); |
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} |
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public void setElem(int line, int col, int band, double data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElem((line & cache.getOffset()), col, band, data); |
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} |
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//*********************************************************
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public void getElemByte(int line, int col, byte[] data) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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for (int iBand = 0; iBand < data.length; iBand++) |
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data[iBand] = (byte)getNoDataValue();
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} |
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cache.getAccessPage().getElemByte((line & cache.getOffset()), col, data); |
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} |
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public void getElemShort(int line, int col, short[] data) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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for (int iBand = 0; iBand < data.length; iBand++) |
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data[iBand] = (short)getNoDataValue();
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} |
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cache.getAccessPage().getElemShort((line & cache.getOffset()), col, data); |
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} |
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public void getElemInt(int line, int col, int[] data) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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for (int iBand = 0; iBand < data.length; iBand++) |
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data[iBand] = (int)getNoDataValue();
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} |
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cache.getAccessPage().getElemInt((line & cache.getOffset()), col, data); |
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} |
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public void getElemFloat(int line, int col, float[] data) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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for (int iBand = 0; iBand < data.length; iBand++) |
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data[iBand] = (float)getNoDataValue();
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} |
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cache.getAccessPage().getElemFloat((line & cache.getOffset()), col, data); |
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} |
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public void getElemDouble(int line, int col, double[] data) { |
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try {
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cacheAccess(line, true);
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} catch (InvalidPageNumberException e) {
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for (int iBand = 0; iBand < data.length; iBand++) |
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data[iBand] = (double)getNoDataValue();
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} |
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cache.getAccessPage().getElemDouble((line & cache.getOffset()), col, data); |
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} |
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//*********************************************************
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public void setElemByte(int line, int col, byte[] data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElemByte((line & cache.getOffset()), col, data); |
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} |
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public void setElemShort(int line, int col, short[] data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElemShort((line & cache.getOffset()), col, data); |
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} |
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public void setElemInt(int line, int col, int[] data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElemInt((line & cache.getOffset()), col, data); |
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} |
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public void setElemFloat(int line, int col, float[] data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElemFloat((line & cache.getOffset()), col, data); |
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} |
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public void setElemDouble(int line, int col, double[] data) { |
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try {
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cacheAccess(line, false);
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} catch (InvalidPageNumberException e) {return;} |
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cache.getAccessPage().setElemDouble((line & cache.getOffset()), col, data); |
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} |
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//TODO: FUNCIONALIDAD: Terminar m?todos de RasterCach?
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//***********************************************
|
| 463 |
//Obtiene una banda entera
|
| 464 |
|
| 465 |
public IBand getBand(int band){ |
| 466 |
return null; |
| 467 |
} |
| 468 |
|
| 469 |
/*
|
| 470 |
* (non-Javadoc)
|
| 471 |
* @see org.gvsig.fmap.driver.IBuffer#getBandBuffer(int)
|
| 472 |
*/
|
| 473 |
public IBuffer getBandBuffer(int iBand){ |
| 474 |
return null; |
| 475 |
} |
| 476 |
|
| 477 |
/*
|
| 478 |
* (non-Javadoc)
|
| 479 |
* @see org.gvsig.fmap.driver.IBuffer#replicateBand(int, int)
|
| 480 |
*/
|
| 481 |
public void replicateBand(int orig, int dest) { |
| 482 |
} |
| 483 |
|
| 484 |
/*
|
| 485 |
* (non-Javadoc)
|
| 486 |
* @see org.gvsig.fmap.dataaccess.buffer.RasterBuffer#switchBands(int[])
|
| 487 |
*/
|
| 488 |
public void switchBands(int[] bandPosition){ |
| 489 |
|
| 490 |
} |
| 491 |
|
| 492 |
//*********************************************************
|
| 493 |
|
| 494 |
public RasterBuffer adjustRasterNearestNeighbourInterpolation(int w, int h, int[] bands) { |
| 495 |
return null; |
| 496 |
} |
| 497 |
|
| 498 |
public RasterBuffer adjustRasterBilinearInterpolation(int w, int h, int[] bands) { |
| 499 |
return null; |
| 500 |
} |
| 501 |
|
| 502 |
public RasterBuffer adjustRasterInverseDistanceInterpolation(int w, int h, int[] bands) { |
| 503 |
return null; |
| 504 |
} |
| 505 |
|
| 506 |
public RasterBuffer adjustRasterBicubicSplineInterpolation(int w, int h, int[] bands) { |
| 507 |
return null; |
| 508 |
} |
| 509 |
|
| 510 |
public RasterBuffer adjustRasterBSplineInterpolation(int w, int h, int[] bands) { |
| 511 |
return null; |
| 512 |
} |
| 513 |
|
| 514 |
//*********************************************************
|
| 515 |
|
| 516 |
public void assign(int band, byte value) { |
| 517 |
for(int line = 0; line < height; line ++){ |
| 518 |
boolean beginLine = true; //Para acelerar solo comprobar? si la p?gina est? en cach? cada vez que empieza una l?nea |
| 519 |
for(int col = 0; col < width; col ++){ |
| 520 |
try {
|
| 521 |
if(beginLine){
|
| 522 |
cacheAccess(line, false);
|
| 523 |
beginLine = false;
|
| 524 |
} |
| 525 |
} catch (InvalidPageNumberException e) {return;} |
| 526 |
cache.getAccessPage().setElem((line & cache.getOffset()), col, band, value); |
| 527 |
} |
| 528 |
} |
| 529 |
} |
| 530 |
|
| 531 |
public void assign(int band, short value) { |
| 532 |
for(int line = 0; line < height; line ++){ |
| 533 |
boolean beginLine = true; //Para acelerar solo comprobar? si la p?gina est? en cach? cada vez que empieza una l?nea |
| 534 |
for(int col = 0; col < width; col ++){ |
| 535 |
try {
|
| 536 |
if(beginLine){
|
| 537 |
cacheAccess(line, false);
|
| 538 |
beginLine = false;
|
| 539 |
} |
| 540 |
} catch (InvalidPageNumberException e) {return;} |
| 541 |
cache.getAccessPage().setElem((line & cache.getOffset()), col, band, value); |
| 542 |
} |
| 543 |
} |
| 544 |
} |
| 545 |
|
| 546 |
public void assign(int band, int value) { |
| 547 |
for(int line = 0; line < height; line ++){ |
| 548 |
boolean beginLine = true; //Para acelerar solo comprobar? si la p?gina est? en cach? cada vez que empieza una l?nea |
| 549 |
for(int col = 0; col < width; col ++){ |
| 550 |
try {
|
| 551 |
if(beginLine){
|
| 552 |
cacheAccess(line, false);
|
| 553 |
beginLine = false;
|
| 554 |
} |
| 555 |
} catch (InvalidPageNumberException e) {return;} |
| 556 |
cache.getAccessPage().setElem((line & cache.getOffset()), col, band, value); |
| 557 |
} |
| 558 |
} |
| 559 |
} |
| 560 |
|
| 561 |
public void assign(int band, float value) { |
| 562 |
for(int line = 0; line < height; line ++){ |
| 563 |
boolean beginLine = true; //Para acelerar solo comprobar? si la p?gina est? en cach? cada vez que empieza una l?nea |
| 564 |
for(int col = 0; col < width; col ++){ |
| 565 |
try {
|
| 566 |
if(beginLine){
|
| 567 |
cacheAccess(line, false);
|
| 568 |
beginLine = false;
|
| 569 |
} |
| 570 |
} catch (InvalidPageNumberException e) {return;} |
| 571 |
cache.getAccessPage().setElem((line & cache.getOffset()), col, band, value); |
| 572 |
} |
| 573 |
} |
| 574 |
} |
| 575 |
|
| 576 |
public void assign(int band, double value) { |
| 577 |
for(int line = 0; line < height; line ++){ |
| 578 |
boolean beginLine = true; //Para acelerar solo comprobar? si la p?gina est? en cach? cada vez que empieza una l?nea |
| 579 |
for(int col = 0; col < width; col ++){ |
| 580 |
try {
|
| 581 |
if(beginLine){
|
| 582 |
cacheAccess(line, false);
|
| 583 |
beginLine = false;
|
| 584 |
} |
| 585 |
} catch (InvalidPageNumberException e) {return;} |
| 586 |
cache.getAccessPage().setElem((line & cache.getOffset()), col, band, value); |
| 587 |
} |
| 588 |
} |
| 589 |
} |
| 590 |
|
| 591 |
/*
|
| 592 |
* (non-Javadoc)
|
| 593 |
* @see org.gvsig.fmap.driver.IBuffer#cloneBuffer()
|
| 594 |
*/
|
| 595 |
public IBuffer cloneBuffer(){
|
| 596 |
return null; |
| 597 |
} |
| 598 |
|
| 599 |
/*
|
| 600 |
* (non-Javadoc)
|
| 601 |
* @see org.gvsig.fmap.driver.IBuffer#interchangeBands(int, int)
|
| 602 |
*/
|
| 603 |
public void interchangeBands(int band1, int band2) { |
| 604 |
} |
| 605 |
|
| 606 |
/*
|
| 607 |
* (non-Javadoc)
|
| 608 |
* @see org.gvsig.fmap.driver.IBuffer#interchangeBands(int[])
|
| 609 |
*/
|
| 610 |
public void interchangeBands(int[] bands){ |
| 611 |
|
| 612 |
} |
| 613 |
|
| 614 |
/*
|
| 615 |
* (non-Javadoc)
|
| 616 |
* @see org.gvsig.fmap.driver.IBuffer#mallocOneBand(int, int, int, int)
|
| 617 |
*/
|
| 618 |
public void mallocOneBand(int dataType, int width, int height, int band) { |
| 619 |
|
| 620 |
} |
| 621 |
|
| 622 |
/*
|
| 623 |
* (non-Javadoc)
|
| 624 |
* @see org.gvsig.fmap.driver.IBuffer#copyBand(int, org.gvsig.fmap.dataaccess.buffer.IBand)
|
| 625 |
*/
|
| 626 |
public void copyBand(int nBand, IBand band) { |
| 627 |
|
| 628 |
} |
| 629 |
|
| 630 |
/*
|
| 631 |
* (non-Javadoc)
|
| 632 |
* @see org.gvsig.fmap.driver.IBuffer#assignBand(int, org.gvsig.fmap.dataaccess.buffer.IBand)
|
| 633 |
*/
|
| 634 |
public void assignBand(int nBand, IBand band) { |
| 635 |
|
| 636 |
} |
| 637 |
|
| 638 |
/*
|
| 639 |
* (non-Javadoc)
|
| 640 |
* @see org.gvsig.fmap.driver.IBuffer#createBand(byte)
|
| 641 |
*/
|
| 642 |
public IBand createBand(byte defaultValue) { |
| 643 |
|
| 644 |
return null; |
| 645 |
} |
| 646 |
|
| 647 |
/*
|
| 648 |
* (non-Javadoc)
|
| 649 |
* @see org.gvsig.fmap.driver.IBuffer#assignBandToNotValid(int)
|
| 650 |
*/
|
| 651 |
public void assignBandToNotValid(int iBand) { |
| 652 |
|
| 653 |
} |
| 654 |
|
| 655 |
//***************************************************************
|
| 656 |
//Algoritmo de reemplazo
|
| 657 |
|
| 658 |
/**
|
| 659 |
* Funci?n que controla para cada l?nea si la p?gina a la que accede est? cacheada o no
|
| 660 |
* . Es la encargada de realizar los reemplazos o cargar la p?gina en el buffer de "p?gina
|
| 661 |
* actualmente accedida" (accessPage de la clase Cache)
|
| 662 |
* @param line L?nea del raster a la que se est? accediendo
|
| 663 |
* @param readOnly ser? true si el acceso que se est? realizando es de lectura y false si se
|
| 664 |
* est? escribiendo alg?n dato
|
| 665 |
*/
|
| 666 |
private void cacheAccess(int line, boolean readOnly)throws InvalidPageNumberException{ |
| 667 |
int pag = line >> cache.getBitsPag();
|
| 668 |
if(cache.isInCache(pag)){
|
| 669 |
if(cache.getNumberInAccessPage() != pag)
|
| 670 |
loadPage(pag, readOnly); |
| 671 |
}else{
|
| 672 |
replacePage(pag + 1, readOnly, false); |
| 673 |
replacePage(pag, readOnly, true);
|
| 674 |
} |
| 675 |
} |
| 676 |
|
| 677 |
/**
|
| 678 |
* Carga la p?gina desde cach? al buffer actualmente en uso. Esta operaci?n no lleva
|
| 679 |
* cambio de datos sino que solo es un cambio de punteros. La secuencia de operaciones es:
|
| 680 |
* <UL>
|
| 681 |
* <LI>Cargar la p?gina como accedida</LI>
|
| 682 |
* <LI>Asignar n?mero a la p?gina accedida</LI>
|
| 683 |
* <LI>Actualizar la antig?edad de accesos.Se incrementar? uno en todas las p?ginas del
|
| 684 |
* conjunto y se pondr? a 0 la p?gina accedida.</LI>
|
| 685 |
* <LI>Poner a 0 el valor de lastAccess de la p?gina cargada. Esto hace que tenga m?nima
|
| 686 |
* prioridad en la politica de reemplazamiento.</LI>
|
| 687 |
* <LI>Poner a false el flag de p?gina modificada si el par?metro readOnly es false.</LI>
|
| 688 |
* </UL>
|
| 689 |
* @param nPag N?mero de p?gina del raster a la que se intenta acceder.
|
| 690 |
* @param readOnly ser? true si el acceso que se est? realizando es de lectura y false si se
|
| 691 |
* est? escribiendo alg?n dato.
|
| 692 |
*/
|
| 693 |
private void loadPage(int nPag, boolean readOnly)throws InvalidPageNumberException{ |
| 694 |
MultiBandPageBuffer buf = cache.getPageBufferFromNumberRasterPage(nPag); |
| 695 |
int[] cacheGroupPage = cache.getNumberGroupFromNumberRasterPage(nPag); |
| 696 |
if(buf != null && cacheGroupPage != null){ //Comprueba que el n?mero de p?gina sea correcto para la cach?. |
| 697 |
cache.setAccessPage(buf, nPag); |
| 698 |
cache.updateLastAccess(cacheGroupPage[0]);
|
| 699 |
cache.setZeroInLastAccess(cacheGroupPage[0], cacheGroupPage[1]); |
| 700 |
if(!readOnly)
|
| 701 |
cache.setModify(cacheGroupPage[0], cacheGroupPage[1]); |
| 702 |
}else
|
| 703 |
throw new InvalidPageNumberException(""); |
| 704 |
//System.out.println("LOAD: "+nPag);
|
| 705 |
} |
| 706 |
|
| 707 |
/**
|
| 708 |
* <P>
|
| 709 |
* Cuando se accede a una p?gina que no est? cacheada necesitamos cargarla en cach? antes de
|
| 710 |
* acceder a ella. Si hay un hueco libre en su conjunto se meter? en este pero sino habr?
|
| 711 |
* que reemplazar una ocupada. Para esto habr? que localizar el conjunto donde va
|
| 712 |
* destinada y luego la posici?n del conjunto donde se cargar? localizando cual es el
|
| 713 |
* elemento del conjunto que hace m?s tiempo que se accedi?.
|
| 714 |
* </P>
|
| 715 |
* <P>
|
| 716 |
* Si el elemento es insertado en un hueco la secuencia es la siguiente:
|
| 717 |
* </P>
|
| 718 |
* <UL>
|
| 719 |
* <LI>Obtenemos la siguiente p?gina vacia.</LI>
|
| 720 |
* <LI>La cargamos de datos.</LI>
|
| 721 |
* <LI>Se asigna como p?gina accedida</LI>
|
| 722 |
* <LI>Ponemos true en su posici?n en el vector cacheada</LI>
|
| 723 |
* <LI>Asignamos el n?mero de p?gina de raster que hemos cargado en esa posici?n de la cach?.</LI>
|
| 724 |
* <LI>Incrementamos en 1 todos los valores de ?ltimo acceso de las p?ginas del grupo.</LI>
|
| 725 |
* <LI>Ponemos a 0 su ?ltimo acceso</LI>
|
| 726 |
* <LI>Si el acceso es para escritura ponemos el flag de p?gina modificada a true.</LI>
|
| 727 |
* </UL>
|
| 728 |
* <P>
|
| 729 |
* Si se reemplaza una p?gina la secuencia es la siguiente:
|
| 730 |
* </P>
|
| 731 |
* <UL>
|
| 732 |
* <LI>Incrementamos en 1 todos los valores de ?ltimo acceso de las p?ginas del grupo y
|
| 733 |
* obtenemos la posici?n de la p?gina de reemplazo.</LI>
|
| 734 |
* <LI>Ponemos a false la p?gina que va a sacarse de cach?</LI>
|
| 735 |
* <LI>Si ha sido modificada la p?gina que va a sacarse de cach? se vuelca a disco</LI>
|
| 736 |
* <LI>Ponemos el flag de modificada para la p?gina sacada a disco a false.</LI>
|
| 737 |
* <LI>Cargamos la p?gina de cach? de datos.</LI>
|
| 738 |
* <LI>Asignamos el n?mero de p?gina de raster que hemos cargado en esa posici?n de la cach?.</LI>
|
| 739 |
* <LI>Se asigna como p?gina accedida</LI>
|
| 740 |
* <LI>Ponemos true en su posici?n en el vector cacheada</LI>
|
| 741 |
* <LI>Ponemos a 0 su ?ltimo acceso</LI>
|
| 742 |
* <LI>Si el acceso es para escritura ponemos el flag de p?gina modificada a true.</LI>
|
| 743 |
* </UL>
|
| 744 |
* @param nPag N?mero de p?gina que est? siendo accedida
|
| 745 |
* @param readOnly ser? true si el acceso que se est? realizando es de lectura y false si se
|
| 746 |
* est? escribiendo alg?n dato.
|
| 747 |
* @param n ser? true si el acceso se est? haciendo a la p?gina n y false si se est? haciendo a
|
| 748 |
* la n+1.
|
| 749 |
*/
|
| 750 |
private void replacePage(int nPag, boolean readOnly, boolean n){ |
| 751 |
int group = nPag % cache.getNGroups();
|
| 752 |
MultiBandPageBuffer pb = null;
|
| 753 |
|
| 754 |
if(nPag >= cache.getNTotalPags())
|
| 755 |
return;
|
| 756 |
|
| 757 |
//Insertamos en un hueco
|
| 758 |
|
| 759 |
if(insertInAHole(group, readOnly, nPag, n))
|
| 760 |
return;
|
| 761 |
|
| 762 |
//Reemplazamos una existente
|
| 763 |
|
| 764 |
int posInGroupPageToReplace = cache.updateLastAccess(group); //Se actualizan los indices y se obtiene la p?gina a reemplazar |
| 765 |
|
| 766 |
cache.setZeroInLastAccess(group, posInGroupPageToReplace); |
| 767 |
int rasterPageToReplace = cache.getRasterPageNumberInPosition(group, posInGroupPageToReplace);
|
| 768 |
pb = cache.getPageBuffer(group, posInGroupPageToReplace); |
| 769 |
|
| 770 |
//Sacamos la antigua
|
| 771 |
cache.setPageAsNotLoadInCache(rasterPageToReplace); |
| 772 |
if(cache.isModified(group, posInGroupPageToReplace)){
|
| 773 |
try {
|
| 774 |
cache.savePage(rasterPageToReplace, pb); //Volcamos disco
|
| 775 |
cache.unsetModify(group, posInGroupPageToReplace); |
| 776 |
} catch (IOException e) { |
| 777 |
System.err.println("No se ha podido salvar la p?gina de cach?."); |
| 778 |
e.printStackTrace(); |
| 779 |
} |
| 780 |
} |
| 781 |
|
| 782 |
//Insertamos la nueva
|
| 783 |
cache.loadPage(nPag, pb); //Cargamos de nuevo el buffer
|
| 784 |
cache.setRasterPageNumberInPosition(group, posInGroupPageToReplace, nPag); |
| 785 |
cache.setPageAsLoadInCache(nPag); //Pone true en su posici?n en el vector cacheada
|
| 786 |
|
| 787 |
if(n){
|
| 788 |
if(!readOnly)
|
| 789 |
cache.setModify(group, posInGroupPageToReplace); |
| 790 |
cache.setAccessPage(pb, nPag); //Asigna como accedida
|
| 791 |
} |
| 792 |
//System.out.println("REPLACE: "+nPag);
|
| 793 |
} |
| 794 |
|
| 795 |
/**
|
| 796 |
* Comprueba si hay alg?n hueco en el que insertar y si es as? se inserta en el y devuelve
|
| 797 |
* true.
|
| 798 |
* @param group conjunto donde hay que buscar para la inserci?n
|
| 799 |
* @param readOnly si es true la operaci?n es de solo consulta y si es false la operaci?n
|
| 800 |
* est? modificando alg?n valor de la p?gina a insertar
|
| 801 |
* @param nPag N?mero de p?gina a cargar
|
| 802 |
* @return true si se ha insertado en un hueco y false si no se ha insertado
|
| 803 |
*/
|
| 804 |
private boolean insertInAHole(int group, boolean readOnly, int nPag, boolean n){ |
| 805 |
MultiBandPageBuffer pb = null;
|
| 806 |
for(int i = 0; i < cache.getPagsPerGroup(); i++){ |
| 807 |
if(cache.getLastAccess()[group][i] == -1){ |
| 808 |
|
| 809 |
//Pone true en su posici?n en el vector cacheada
|
| 810 |
pb = cache.getPageBuffer(group, i); |
| 811 |
cache.loadPage(nPag, pb); //Sube la p?gina a cach?
|
| 812 |
cache.setRasterPageNumberInPosition(group, i, nPag);//Asigna el n?mero de p?g a una posici?n de cach?
|
| 813 |
cache.setPageAsLoadInCache(nPag); |
| 814 |
cache.updateLastAccess(group); |
| 815 |
cache.setZeroInLastAccess(group, i); |
| 816 |
if(n){ //La n+1 no se carga como accedida ni se pone a 0 su contador de ?ltima accedida |
| 817 |
if(!readOnly)
|
| 818 |
cache.setModify(group, i); |
| 819 |
cache.setAccessPage(pb, nPag); //Asigna como accedida
|
| 820 |
} |
| 821 |
//System.out.println("INSERT: "+nPag);
|
| 822 |
return true; |
| 823 |
} |
| 824 |
} |
| 825 |
return false; |
| 826 |
} |
| 827 |
|
| 828 |
} |