gvsig-raster / org.gvsig.raster.cache / trunk / org.gvsig.raster.cache / org.gvsig.raster.cache.lib.impl / deprecated / buffer / impl / stripecache / horizontal / CacheHorzImpl.java @ 1939
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package org.gvsig.raster.cache.buffer.impl.stripecache.horizontal; |
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import java.io.IOException; |
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import org.gvsig.raster.cache.buffer.Band; |
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import org.gvsig.raster.cache.buffer.exception.WrongParameterException; |
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import org.gvsig.raster.cache.buffer.impl.stripecache.Cache; |
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import org.gvsig.raster.cache.buffer.impl.stripecache.CacheStruct; |
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import org.gvsig.raster.cache.buffer.impl.stripecache.HDDPageList; |
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import org.gvsig.raster.cache.buffer.impl.stripecache.PageBuffer; |
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import org.gvsig.raster.cache.buffer.impl.stripecache.PageCacheList; |
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/**
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* <P>
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* Esta clase representa a la cache raster. Consta de una ser?e de p?ginas (CachePages)
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* que son buffers con los bloques de datos cacheados en un instante dado. Esta cache tiene
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* una estructura en forma de array donde cada elemento es una p?gina de cach?. Las p?ginas
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* se agrupan en bloques de N p?ginas denominados grupos. La variable nelemsGroup contiene
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* el n?mero de p?ginas de cada grupo.
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* </P>
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* <P>
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* La politica de reemplazo es que una p?gina siempre va a un conjunto determinado por el calculo
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* cto = pag % nelemsGroup. Si hay hueco vac?o en el grupo se a?adir? en el siguiente hueco pero
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* si hay que reeplazar se reeplazar? la p?gina que m?s tiempo haga su ?ltimo acceso.
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* </P>
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* <P>
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* Esta cach? lleva el control de que p?ginas est?n cargadas a trav?s de un array de de booleanos
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* donde cada elemento representa a una p?gina de datos del raster. Si el elemento en la posici?n
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* N de dicho array es true significa que la p?gina est? cacheada. Si es false no lo estar?.
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* </P>
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* <P>
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* La p?gina de datos actualmente accedida debe estar cacheada por lo que est? clase debe llevar
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* el control de que p?gina se est? accediendo o a sido accedida por ?ltima vez. La variable que
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* nos dice que p?gina est? siendo accedida es loadPage y pageBuffer ser? la variable que apunta
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* al buffer de esta p?gina. Cuando se cambia de p?gina en un acceso estas dos variables deben
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* cambiar a sus nuevos valores.
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* </P>
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* <P>
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* Otro par?metro que controla esta clase es que p?gina de cada grupo ha sido accedido con mayor
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* frecuencia. Esto es ?til porque siempre se reemplaza la p?gina de un grupo que haga m?s tiempo
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* que haya sido accedida bajo la premisa de que "las p?ginas con accesos recientes tienen mayor
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* probabilidad de volver a ser usadas". Esto es controlado por la variable lastAccess que es
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* usada para implementar el algoritmo LRU. Cada vez que una p?gina de un grupo es accedida su
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* contador de lastAccess se pone a 0. El resto de contadores de las p?ginas del grupo se incrementa
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* en uno. Siempre se sustituye la p?gina del grupo con valor m?s grande en el contador.
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* </P>
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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 CacheHorzImpl implements Cache { |
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/**
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* List of pages in disk. This array represents all pages
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*/
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protected HDDPageList hddPageList = null; |
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/**
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* List of pages in memory. This array represents cached pages
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*/
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protected PageCacheList pageCacheList = null; |
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/**
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* Cada elemento es una p?gina del raster y dice si est? cacheada o no.
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*/
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protected boolean[] cacheada = null; |
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/**
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* N?mero de p?gina cargada en accessPage.
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*/
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protected int numberInAccessPage = -1; |
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/**
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* Buffer de datos de la p?gina actualmente accedida.
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*/
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protected PageBuffer accessPage = null; |
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/**
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* Cada elemento del array es una p?gina de cach? y contiene el n?mero de p?gina cargada en
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* esa posici?n.
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*/
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protected int[] pageNumberInCache = null; |
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/**
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* P?ginas de la cach?.
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*/
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protected CacheStruct cacheStruct = null; |
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/**
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* ?ltimo acceso a las p?ginas de cada grupo. Valores de la antig?edad del acceso dentro del
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* grupo. La primera dimensi?n del array corresponde al n?mero de grupo y la segunda
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* a los elementos del grupo. El elemento del grupo con un acceso m?s reciente tendr?
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* un n?mero menor y el de mayor valor ser? el candidato para la sustituci?n en el pr?ximo
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* remplazamiento
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*/
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protected int[][] lastAccess = null; |
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/**
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* Cada elemento representa una p?gina de cach? y dice si esta ha sido modificada desde que
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* fu? cargada en cach? o no.
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*/
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protected boolean[] modified = null; |
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protected int dataSourceWidth = 0; |
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protected int dataSourceHeight = 0; |
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/**
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* Inicializamos la variables. Para ello creamos el objeto Cache que contendr? todos los
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* par?metros necesarios para crear el array que controla los accesos m?s recientes y el
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* array que dice si una p?gina est? en memoria o no.
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* @param nBands N?mero de bandas
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* @param dataType Tipo de dato de la p?gina
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* @param dataSourceWidth ancho de la fuente de datos
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*/
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public CacheHorzImpl(int nBands, int dataType, int dataSourceWidth, int dataSourceHeight) { |
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this.dataSourceHeight = dataSourceHeight;
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this.dataSourceWidth = dataSourceWidth;
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init(nBands, dataType, dataSourceWidth, dataSourceHeight); |
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} |
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/**
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* Contructor
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* @param cacheStruct
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*/
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public CacheHorzImpl(CacheStruct cacheStruct) {
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this.cacheStruct = cacheStruct;
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//Inicializamos la antig?edad de acceso
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lastAccess = new int[cacheStruct.getNGroups()][cacheStruct.getPagsPerGroup()]; |
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//Creamos el buffer de la cach?
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//page = new PageBuffer[cacheStruct.getNPags()];
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pageNumberInCache = new int[cacheStruct.getNPags()]; |
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modified = new boolean[cacheStruct.getNPags()]; |
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cacheada = new boolean[cacheStruct.getNTotalPags()]; |
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initStructs(); |
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initPointers(); |
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createPages(getNBands()); |
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} |
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/**
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* Initialize arrays and data structures
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* @param nBands
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* @param dataType
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* @param dataSourceWidth
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* @param dataSourceHeight
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*/
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protected void init(int nBands, int dataType, int dataSourceWidth, int dataSourceHeight) { |
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//Creamos la estructura de la cach?
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cacheStruct = new CacheStruct(nBands, dataType, dataSourceWidth, dataSourceHeight);
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//Inicializamos la antig?edad de acceso
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lastAccess = new int[cacheStruct.getNGroups()][cacheStruct.getPagsPerGroup()]; |
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//Creamos el buffer de la cach?
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pageNumberInCache = new int[cacheStruct.getNPags()]; |
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modified = new boolean[cacheStruct.getNPags()]; |
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cacheada = new boolean[cacheStruct.getNTotalPags()]; |
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initStructs(); |
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initPointers(); |
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createPages(getNBands()); |
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} |
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/**
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* Inicializa las estructuras de mantenimiento de cach?. Estas son array de paginas
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* accedidas por ?ltima vez, numeros de p?gina cargadas en cada posici?n de cach?,
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* array con la informaci?n de p?gina modificada y array que dice si una p?gina de disco
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* est? cacheada o no.
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*/
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protected void initStructs() { |
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for(int i = 0; i < cacheStruct.getNGroups(); i ++) |
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for(int j = 0; j < cacheStruct.getPagsPerGroup(); j ++) |
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lastAccess[i][j] = -1;
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for(int i = 0; i < cacheada.length; i++) |
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cacheada[i] = false;
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for(int i = 0; i < cacheStruct.getNPags(); i++) { |
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//pageNumberInCache[i] = -1;
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modified[i] = false;
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} |
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} |
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protected void initPointers() { |
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int cont = 0; |
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for(int iGroup = 0; iGroup < cacheStruct.getNGroups(); iGroup ++) { |
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for(int iPagPerGroup = 0; iPagPerGroup < cacheStruct.getPagsPerGroup(); iPagPerGroup ++) { |
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int pag = iGroup + (cacheStruct.getNGroups() * iPagPerGroup);
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pageNumberInCache[cont] = pag; |
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if(pag < cacheada.length - 1) |
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cacheada[pag] = true;
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cont ++; |
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} |
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} |
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} |
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/**
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* Create new and empty pages with the structure information of
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* this cache
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*/
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public void createPages(int bands) { |
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hddPageList = new HDDPageList(cacheStruct.getNTotalPags(), bands);
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pageCacheList = new PageCacheList(cacheStruct.getNPags(),
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bands, |
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cacheStruct.getHPag(), |
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cacheStruct.getDataType(), |
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dataSourceWidth); |
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pageCacheList.setHddPages(hddPageList); |
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} |
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/**
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* Load the cache status selected in the parameter. The array has one position for each
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* page of cache. In each position has the page number loaded in that memory place.
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*
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* @param pageNumberInCache Array of positions
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* @throws InterruptedException
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*/
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public void loadCacheStatus(int[] pageNumberInCache) throws InterruptedException { |
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if(pageNumberInCache.length != pageCacheList.size())
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return;
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for (int iPage = 0; iPage < pageNumberInCache.length; iPage++) |
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pageCacheList.get(iPage).loadPage(pageNumberInCache[iPage]); |
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} |
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/**
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* Limpia los trozos de cach? en disco. Despu?s del llamar a este
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* m?todo no puede volver a usarse esta cach?.
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* @throws IOException
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*/
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public void clearCache() throws IOException { |
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pageCacheList.clearPageList(); |
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hddPageList.clearPageList(); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getBitsPag()
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*/
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public int getBitsPag() { |
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return cacheStruct.getBitsPag();
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} |
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/**
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* Obtiene la altura de la p?gina de cache en l?neas.
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* @return N?mero de l?neas de altura de p?gina.
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*/
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public int getHPag() { |
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return cacheStruct.getHPag();
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#isInCache(int)
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*/
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public boolean isInCache(int nPag) { |
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/*if(nPag < 0 || nPag >= cacheada.length)
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return false;*/
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return cacheada[nPag];
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#setPageAsLoadInCache(int)
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*/
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public void setPageAsLoadInCache(int nPag) { |
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if(nPag < 0 || nPag >= cacheada.length) |
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return;
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cacheada[nPag] = true;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#setPageAsNotLoadInCache(int)
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*/
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public void setPageAsNotLoadInCache(int nPag) { |
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if(nPag < 0 || nPag >= cacheada.length) |
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return;
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cacheada[nPag] = false;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getRasterPageNumberInPosition(int)
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*/
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public int getRasterPageNumberInPosition(int nCachePage) { |
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return pageNumberInCache[nCachePage];
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getRasterPageNumberInPosition(int, int)
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*/
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public int getRasterPageNumberInPosition(int group, int posInGroup) { |
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return pageNumberInCache[group * getPagsPerGroup() + posInGroup];
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#setRasterPageNumberInPosition(int, int)
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*/
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public void setRasterPageNumberInPosition(int nCachePage, int nRasterPage) { |
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pageNumberInCache[nCachePage] = nRasterPage; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#setRasterPageNumberInPosition(int, int, int)
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*/
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public void setRasterPageNumberInPosition(int group, int posInGroup, int nRasterPage) { |
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pageNumberInCache[group * getPagsPerGroup() + posInGroup] = nRasterPage; |
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} |
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/**
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* Obtiene el n?mero de p?gina de cach? donde est? cargada la p?gina del raster
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* que se ha pasado por par?metro.
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* @param pag P?gina del raster
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* @return N?mero de p?gina del raster
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*/
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public int getNumberCachePageFromNumberRasterPage(int pag) { |
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int group = pag % getNGroups();
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for(int i = 0; i < getPagsPerGroup(); i++) |
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if(pageNumberInCache[group + i] == pag)
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return (group * getPagsPerGroup() + i);
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return -1; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getNumberGroupFromNumberRasterPage(int)
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*/
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public int[] getNumberGroupFromNumberRasterPage(int pag) { |
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int group = pag % getNGroups();
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for(int i = 0; i < getPagsPerGroup(); i++) |
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if(pageNumberInCache[(group * getPagsPerGroup()) + i] == pag)
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return new int[]{group, i}; |
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return null; |
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} |
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|
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getLastAccess()
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*/
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public int[][] getLastAccess() { |
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return lastAccess;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#setZeroInLastAccess(int, int)
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*/
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public void setZeroInLastAccess(int group, int posInGroup) { |
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lastAccess[group][posInGroup] = 0;
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} |
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|
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getNumberInAccessPage()
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*/
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public int getNumberInAccessPage() { |
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return numberInAccessPage;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getPagsPerGroup()
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*/
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public int getPagsPerGroup() { |
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return cacheStruct.getPagsPerGroup();
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} |
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/**
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* Obtiene la p?gina de datos de la posici?n pag
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* @param pag N?mero de p?gina de cach? a recuperar
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* @return PageBuffer correspondiente a la p?gina recuperada
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*/
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public PageBuffer getPageBufferFromNumberCachePage(int pag) { |
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return pageCacheList.get(pag);
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} |
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/**
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* Obtiene la p?gina de datos a partir del n?mero de p?gina de raster
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* @param pag N?mero de p?gina raster a recuperar
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* @return PageBuffer correspondiente a la p?gina recuperada o null si no est? en cach?
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*/
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public PageBuffer getPageBufferFromNumberRasterPage(int pag) { |
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int group = pag % getNGroups();
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for(int i = 0; i < getPagsPerGroup(); i++) |
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if(pageNumberInCache[group * getPagsPerGroup() + i] == pag)
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return pageCacheList.get(group * getPagsPerGroup() + i);
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return null; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getPageBuffer(int, int)
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*/
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public PageBuffer getPageBuffer(int group, int posInGroup) { |
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return pageCacheList.get(group * getPagsPerGroup() + posInGroup);
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} |
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/*
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* (non-Javadoc)
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* @see org.cachete.buffer.stripecache.ICache#getAccessPage()
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*/
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public PageBuffer getAccessPage() {
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return accessPage;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#setAccessPage(org.gvsig.raster.cache.buffer.impl.stripecache.horizontal.PageBuffer, int)
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*/
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public void setAccessPage(PageBuffer pb, int pagNumber) { |
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accessPage = pb; |
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numberInAccessPage = pagNumber; |
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} |
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|
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#isModified(int)
|
| 417 |
*/
|
| 418 |
public boolean isModified(int nCachePag) { |
| 419 |
return modified[nCachePag];
|
| 420 |
} |
| 421 |
|
| 422 |
/*
|
| 423 |
* (non-Javadoc)
|
| 424 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#isModified(int, int)
|
| 425 |
*/
|
| 426 |
public boolean isModified(int group, int posInGroup) { |
| 427 |
return modified[group * getPagsPerGroup() + posInGroup];
|
| 428 |
} |
| 429 |
|
| 430 |
/*
|
| 431 |
* (non-Javadoc)
|
| 432 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#setModify(int)
|
| 433 |
*/
|
| 434 |
public void setModify(int nCachePag) { |
| 435 |
modified[nCachePag] = true;
|
| 436 |
} |
| 437 |
|
| 438 |
/**
|
| 439 |
* Pone como modificada una p?gina de cach?
|
| 440 |
* @param group Grupo en el que se encuentra la p?gina
|
| 441 |
* @param posInGroup Posici?n dentro del grupo en el que est? la p?gina
|
| 442 |
*/
|
| 443 |
public void setModify(int group, int posInGroup) { |
| 444 |
modified[group * getPagsPerGroup() + posInGroup] = true;
|
| 445 |
} |
| 446 |
|
| 447 |
/*
|
| 448 |
* (non-Javadoc)
|
| 449 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#unsetModify(int)
|
| 450 |
*/
|
| 451 |
public void unsetModify(int nCachePag) { |
| 452 |
modified[nCachePag] = false;
|
| 453 |
} |
| 454 |
|
| 455 |
/*
|
| 456 |
* (non-Javadoc)
|
| 457 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#unsetModify(int, int)
|
| 458 |
*/
|
| 459 |
public void unsetModify(int group, int posInGroup) { |
| 460 |
modified[group * getPagsPerGroup() + posInGroup] = false;
|
| 461 |
} |
| 462 |
|
| 463 |
/**
|
| 464 |
* Obtiene el n?mero de p?ginas de la cach?
|
| 465 |
* @return N?mero total de p?ginas de la cach?
|
| 466 |
*/
|
| 467 |
public int getNPags() { |
| 468 |
return cacheStruct.getNPags();
|
| 469 |
} |
| 470 |
|
| 471 |
/**
|
| 472 |
* Obtiene el n?mero de bandas
|
| 473 |
* @return N?mero de bandas
|
| 474 |
*/
|
| 475 |
public int getNBands() { |
| 476 |
return cacheStruct.getNBands();
|
| 477 |
} |
| 478 |
|
| 479 |
/**
|
| 480 |
* Obtiene la estructura de ca cach?
|
| 481 |
* @return CacheStruct
|
| 482 |
*/
|
| 483 |
public CacheStruct getCacheStruct() {
|
| 484 |
return cacheStruct;
|
| 485 |
} |
| 486 |
|
| 487 |
/**
|
| 488 |
* Asigna la estructura de ca cach?
|
| 489 |
* @param CacheStruct
|
| 490 |
*/
|
| 491 |
public void setCacheStruct(CacheStruct cacheStruct) { |
| 492 |
this.cacheStruct = cacheStruct;
|
| 493 |
} |
| 494 |
|
| 495 |
/*
|
| 496 |
* (non-Javadoc)
|
| 497 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getNGroups()
|
| 498 |
*/
|
| 499 |
public int getNGroups() { |
| 500 |
return cacheStruct.getNGroups();
|
| 501 |
} |
| 502 |
|
| 503 |
/*
|
| 504 |
* (non-Javadoc)
|
| 505 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#getNTotalPags()
|
| 506 |
*/
|
| 507 |
public int getNTotalPags() { |
| 508 |
return cacheStruct.getNTotalPags();
|
| 509 |
} |
| 510 |
|
| 511 |
/**
|
| 512 |
* Obtiene el array con los n?meros de p?gina que hay cargados
|
| 513 |
* en cada bloque de cache
|
| 514 |
* @return array con los n?mero de p?gina
|
| 515 |
*/
|
| 516 |
public int[] getPageNumberInCache() { |
| 517 |
return this.pageNumberInCache; |
| 518 |
} |
| 519 |
|
| 520 |
/**
|
| 521 |
* Para extraer el desplazamiento de una direcci?n (l?nea de raster) hay que hacer una operaci?n And con
|
| 522 |
* con la altura de la p?gina -1. Por ejemplo, una p?gina de 16 l?neas de altura el desplazamiento ser?
|
| 523 |
* 16 - 1 = 15 porque 15 en binario es 1111.
|
| 524 |
*
|
| 525 |
* Si queremos acceder a la linea del raster n?mero 83 (1010011) realizando la operaci?n And con el valor del
|
| 526 |
* desplazamiento obtenemos (0001111 & 1010011 = 0000011), es decir el valor 3 en decimal. Esto quiere decir
|
| 527 |
* que la l?nea 83 del raster es la 3 de su p?gina.
|
| 528 |
* @return valor del desplazamiento
|
| 529 |
*/
|
| 530 |
public int getOffset() { |
| 531 |
return cacheStruct.getOffset();
|
| 532 |
} |
| 533 |
|
| 534 |
/**
|
| 535 |
* Convierte una p?gina dentro de un grupo de la cach? en un n?mero de
|
| 536 |
* p?gina de cach?. Por ejemplo, en una cach? de 10 grupos y 5 p?ginas por grupo
|
| 537 |
* la p?gina 2 del grupo 4 devolver? el 23 (5 * 4 + 3 = 23) teniendo en cuenta que
|
| 538 |
* la p?gina y el grupo cero tambi?n cuentan.
|
| 539 |
* @param group
|
| 540 |
* @param pageInGroup
|
| 541 |
* @return
|
| 542 |
*/
|
| 543 |
public int convertPageInGroupToPageInCache(int group, int pageInGroup) { |
| 544 |
return (group * cacheStruct.getPagsPerGroup() + pageInGroup);
|
| 545 |
} |
| 546 |
|
| 547 |
/*
|
| 548 |
* (non-Javadoc)
|
| 549 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#updateLastAccess(int)
|
| 550 |
*/
|
| 551 |
public int updateLastAccess(int group) { |
| 552 |
int max = Integer.MIN_VALUE; |
| 553 |
int posMax = 0; |
| 554 |
for(int i = 0; i < getPagsPerGroup(); i++) { |
| 555 |
if(getLastAccess()[group][i] >= 0) |
| 556 |
getLastAccess()[group][i] ++; |
| 557 |
|
| 558 |
if(getLastAccess()[group][i] > max) {
|
| 559 |
max = getLastAccess()[group][i]; |
| 560 |
posMax = i; |
| 561 |
} |
| 562 |
} |
| 563 |
return posMax;
|
| 564 |
} |
| 565 |
|
| 566 |
/**
|
| 567 |
* Obtiene la posici?n del grupo de la p?gina a reemplazar, es decir la de m?ximo valor
|
| 568 |
* en el vector lastAccess.
|
| 569 |
* @param group N?mero de grupo a obtener la p?gina de reemplazo
|
| 570 |
* @return La posici?n del elemento del grupo con valor m?ximo. Este elemento
|
| 571 |
* es el candidato para el reemplazo.
|
| 572 |
*/
|
| 573 |
public int posInGroupPagToReplace(int group) { |
| 574 |
int max = Integer.MIN_VALUE; |
| 575 |
int posMax = 0; |
| 576 |
for(int i = 0; i < getPagsPerGroup(); i++) { |
| 577 |
if(getLastAccess()[group][i] > max) {
|
| 578 |
max = getLastAccess()[group][i]; |
| 579 |
posMax = i; |
| 580 |
} |
| 581 |
} |
| 582 |
return posMax;
|
| 583 |
} |
| 584 |
|
| 585 |
/*
|
| 586 |
* (non-Javadoc)
|
| 587 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#loadPage(int, int, int)
|
| 588 |
*/
|
| 589 |
public void loadPage(int group, int posInGroupPageToReplace, int nPag) throws InterruptedException { |
| 590 |
pageCacheList.get(group * getPagsPerGroup() + posInGroupPageToReplace).loadPage(nPag); |
| 591 |
} |
| 592 |
|
| 593 |
/*
|
| 594 |
* (non-Javadoc)
|
| 595 |
* @see org.gvsig.raster.cache.buffer.impl.stripecache.ICache#savePage(int, int, int)
|
| 596 |
*/
|
| 597 |
public void savePage(int group, int posInGroupPageToReplace, int nPag) throws IOException { |
| 598 |
pageCacheList.get(group * getPagsPerGroup() + posInGroupPageToReplace).savePage(nPag); |
| 599 |
} |
| 600 |
|
| 601 |
/**
|
| 602 |
* Salva a disco todas las p?ginas en memoria cach? e inicializa estructuras de datos.
|
| 603 |
*
|
| 604 |
* @throws IOException
|
| 605 |
*/
|
| 606 |
public void resetCache() throws IOException { |
| 607 |
for (int iCachePage = 0; iCachePage < pageCacheList.size(); iCachePage++) { |
| 608 |
if(modified[iCachePage])
|
| 609 |
pageCacheList.get(iCachePage).savePage(this.getRasterPageNumberInPosition(iCachePage));
|
| 610 |
} |
| 611 |
initStructs(); |
| 612 |
} |
| 613 |
|
| 614 |
/**
|
| 615 |
* Remove the selected cache band from disk and memory
|
| 616 |
* @param iBand Band number to remove
|
| 617 |
* @throws IOException
|
| 618 |
*/
|
| 619 |
public void removeBand(int pos) throws IOException { |
| 620 |
pageCacheList.removeBand(pos); |
| 621 |
hddPageList.removeBand(pos); |
| 622 |
} |
| 623 |
|
| 624 |
/**
|
| 625 |
* Add an empty band in the cache
|
| 626 |
* @param iBand Band number to add
|
| 627 |
* @throws IOException
|
| 628 |
*/
|
| 629 |
public void addBand(int pos) throws IOException { |
| 630 |
resetCache(); |
| 631 |
pageCacheList.addBand(pos); |
| 632 |
PageBuffer buf = new PageBuffer(cacheStruct.getDataType(), dataSourceWidth, cacheStruct.getHPag(), 1, true); |
| 633 |
hddPageList.addBand(pos, buf); |
| 634 |
} |
| 635 |
|
| 636 |
/**
|
| 637 |
* Add a band in the cache
|
| 638 |
* @param iBand Band number to add
|
| 639 |
* @param Band Band to add
|
| 640 |
* @throws IOException
|
| 641 |
*/
|
| 642 |
public void addBand(int pos, Band band) throws IOException { |
| 643 |
resetCache(); |
| 644 |
pageCacheList.addBand(pos); |
| 645 |
PageBuffer buf = new PageBuffer(cacheStruct.getDataType(), dataSourceWidth, band.getBlockSize(), 1, true); |
| 646 |
hddPageList.addBand(pos, band, buf); |
| 647 |
} |
| 648 |
|
| 649 |
/**
|
| 650 |
* Swap bands accordint to positions selected in bandPosition parameter.
|
| 651 |
*
|
| 652 |
* @param bandPosition
|
| 653 |
* New order for the bands in the array. Each position in the array represent the old band
|
| 654 |
* .The number that it contains represent the new position of that band. For instance, an
|
| 655 |
* array with values {1, 0, 2, 3} means that it has four bands and the band number one is swaped
|
| 656 |
* with the band number zero. The bands two and three don't change its position in this example.
|
| 657 |
* @throws WrongParameterException
|
| 658 |
* @throws IOException
|
| 659 |
*/
|
| 660 |
public void swapBands(int[] bandPosition) throws WrongParameterException, IOException { |
| 661 |
resetCache(); |
| 662 |
pageCacheList.swapBands(bandPosition); |
| 663 |
hddPageList.swapBands(bandPosition); |
| 664 |
} |
| 665 |
|
| 666 |
/**
|
| 667 |
* Consulta si alguna p?gina de memoria tiene modificaciones para volcar a disco
|
| 668 |
* @return true si hay alguna p?gina con modificaciones y false si no la hay
|
| 669 |
*/
|
| 670 |
public boolean anyPageModified() { |
| 671 |
for (int iPage = 0; iPage < modified.length; iPage++) { |
| 672 |
if(modified[iPage])
|
| 673 |
return true; |
| 674 |
} |
| 675 |
return false; |
| 676 |
} |
| 677 |
|
| 678 |
/**
|
| 679 |
* Get the width of the data source
|
| 680 |
* @return int
|
| 681 |
*/
|
| 682 |
public int getDataSourceWidth() { |
| 683 |
return dataSourceWidth;
|
| 684 |
} |
| 685 |
|
| 686 |
/**
|
| 687 |
* Get the height of the data source
|
| 688 |
* @return int
|
| 689 |
*/
|
| 690 |
public int getDataSourceHeight() { |
| 691 |
return dataSourceHeight;
|
| 692 |
} |
| 693 |
|
| 694 |
/*
|
| 695 |
* (non-Javadoc)
|
| 696 |
* @see java.lang.Object#clone()
|
| 697 |
*/
|
| 698 |
public Object clone() { |
| 699 |
CacheHorzImpl clon = cloneStructure(); |
| 700 |
clon.hddPageList = (HDDPageList)hddPageList.clone(); |
| 701 |
clon.pageCacheList = (PageCacheList)pageCacheList.clone(); |
| 702 |
clon.pageCacheList.setHddPages(clon.hddPageList); |
| 703 |
return clon;
|
| 704 |
} |
| 705 |
|
| 706 |
/**
|
| 707 |
* Clone the cache structure without clone data pages neither disk pages
|
| 708 |
* @return Cache
|
| 709 |
*/
|
| 710 |
public CacheHorzImpl cloneStructure() {
|
| 711 |
CacheHorzImpl clon = new CacheHorzImpl(cacheStruct.getNBands(), cacheStruct.getDataType(), dataSourceWidth, dataSourceHeight);
|
| 712 |
for (int i = 0; i < cacheada.length; i++) |
| 713 |
clon.cacheada[i] = cacheada[i]; |
| 714 |
clon.numberInAccessPage = numberInAccessPage; |
| 715 |
for (int i = 0; i < pageNumberInCache.length; i++) |
| 716 |
clon.pageNumberInCache[i] = pageNumberInCache[i]; |
| 717 |
for (int i = 0; i < lastAccess.length; i++) { |
| 718 |
for (int j = 0; j < lastAccess[i].length; j++) { |
| 719 |
clon.lastAccess[i][j] = lastAccess[i][j]; |
| 720 |
} |
| 721 |
} |
| 722 |
for (int i = 0; i < modified.length; i++) |
| 723 |
clon.modified[i] = modified[i]; |
| 724 |
clon.cacheStruct = (CacheStruct)cacheStruct.clone(); |
| 725 |
return clon;
|
| 726 |
} |
| 727 |
|
| 728 |
/**
|
| 729 |
* Imprime la informaci?n de estructura de cach?
|
| 730 |
*/
|
| 731 |
public void show() { |
| 732 |
((org.gvsig.raster.cache.buffer.impl.stripecache.CacheStruct)cacheStruct).show(); |
| 733 |
System.out.println("Cacheada:"); |
| 734 |
for(int i = 0; i < cacheada.length; i++) |
| 735 |
System.out.print(i + "=" + cacheada[i]+" "); |
| 736 |
System.out.println();
|
| 737 |
System.out.println("LastAccess:"); |
| 738 |
for(int i = 0; i < cacheStruct.getNGroups(); i++) { |
| 739 |
System.out.println("Grupo " + i +":"); |
| 740 |
for(int j = 0; j < cacheStruct.getPagsPerGroup(); j++) |
| 741 |
System.out.println("elem " + j + " : " + "Page " + pageNumberInCache[i * cacheStruct.getPagsPerGroup() + j] + " : " + lastAccess[i][j]); |
| 742 |
|
| 743 |
} |
| 744 |
} |
| 745 |
|
| 746 |
/**
|
| 747 |
* Imprime la informaci?n de estructura de cach?
|
| 748 |
* @throws IOException
|
| 749 |
*/
|
| 750 |
// public void log(String txt) {
|
| 751 |
// try {
|
| 752 |
// FileServices.getDesc().write(txt);
|
| 753 |
// FileServices.getDesc().newLine();
|
| 754 |
// FileServices.getDesc().write("**** Pag(i) = ?Cacheada?: ****");
|
| 755 |
// FileServices.getDesc().newLine();
|
| 756 |
// /*for(int i = 0; i < cacheada.length; i++) {
|
| 757 |
// TxtIO.getDesc().write(i + "=" + cacheada[i] + " ");
|
| 758 |
// TxtIO.getDesc().newLine();
|
| 759 |
// }*/
|
| 760 |
//
|
| 761 |
// FileServices.getDesc().write("Numero pag en accessPage: " + numberInAccessPage);
|
| 762 |
// FileServices.getDesc().newLine();
|
| 763 |
// FileServices.getDesc().write("Accesos:");
|
| 764 |
// FileServices.getDesc().newLine();
|
| 765 |
// int count = 0;
|
| 766 |
// for(int i = 0; i < cacheStruct.getNGroups(); i++) {
|
| 767 |
// FileServices.getDesc().write("--->Grupo " + i +":");
|
| 768 |
// FileServices.getDesc().newLine();
|
| 769 |
// for(int j = 0; j < cacheStruct.getPagsPerGroup(); j++) {
|
| 770 |
// FileServices.getDesc().write("Pos:" + count + ", Pos grupo:" + j + " : " + ", Pag en esta pos: " + pageNumberInCache[i * cacheStruct.getPagsPerGroup() + j] + " Access:" + lastAccess[i][j]);
|
| 771 |
// FileServices.getDesc().newLine();
|
| 772 |
// count ++;
|
| 773 |
// }
|
| 774 |
// }
|
| 775 |
// } catch (IOException e) {
|
| 776 |
// e.printStackTrace();
|
| 777 |
// }
|
| 778 |
// }
|
| 779 |
|
| 780 |
} |