Difference between revisions of "Solução: Problema da memória transacional (Diogo Maron)"

package console;
 
import java.util.Scanner;
import memoriatransacional.MemoriaTransacional;
 
public class Main {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner loScanner = new Scanner(System.in);
        String lsEntrada = loScanner.nextLine();
        MemoriaTransacional loMemoria = new MemoriaTransacional();
        String[] loSaida = loMemoria.ExecutarEscrita(lsEntrada.split(" "));
        for (int i = 0; i < loSaida.length; i++){
            String lsLetra = new String();
            lsLetra +=(char)((int)'A' + i);
            System.out.println(lsLetra + "=" + loSaida[i]);
        }
    }
 
}
 
package memoriatransacional;
 
public class MemoriaTransacional {
 
    private int TAMANHO_MEMORIA = 26;
 
    private String[] ioMemoria = new String[TAMANHO_MEMORIA];
    private Transaction ioTransaction;
 
    public MemoriaTransacional() {
        this.Reset();
    }
    public String[] ExecutarEscrita(String[] aoEscritas){
        for (int i = 0; i<aoEscritas.length; i++){
            if (aoEscritas[i].contains("="))
                this.ExecutarEscrita(aoEscritas[i]);
            else {
                this.ExecutarTransaction(aoEscritas[i]);
            }
        }
        return ioMemoria;
    }
 
    public void ExecutarEscrita(String asEscrita){
        if (this.IsInTransaction())
            this.ioTransaction.AddEscrita((asEscrita));
        else
            this.Escrever(asEscrita);
    }
 
    private void Escrever(String asEscrita){
        String[] loValores = asEscrita.split("=");
        int liPosicao = (int)loValores[0].charAt(0) - (int)'A';
        this.ioMemoria[liPosicao] = loValores[1];
    }
 
    private void ExecutarTransaction(String asComando){
        if (asComando.equals("B"))
            this.BeginTransaction();
        else if (asComando.equals("C"))
            this.CommitTransaction();
        else if (asComando.equals("R"))
            this.RollBackTransaction();
    }
 
    private void BeginTransaction() {
        if (this.IsInTransaction()){
            this.ioTransaction.Begin();
        }
        else
            this.ioTransaction = new Transaction();
    }
 
    private void CommitTransaction(){
        if (this.ioTransaction.Commit()) {
            for (String loString : this.ioTransaction.GetEscritas())
                this.Escrever(loString);
            this.ioTransaction=null;
        }
    }
 
    private void RollBackTransaction(){
        if (this.ioTransaction.RollBack()) {
            this.ioTransaction=null;
        }
    }
 
    private Boolean IsInTransaction(){
        return (this.ioTransaction != null);
    }
 
    public void Reset(){
        for (int i =0; i < TAMANHO_MEMORIA; i++)
            this.ioMemoria[i] = "";
    }
 
}
 
 
package memoriatransacional;
 
import java.util.ArrayList;
 
public class Transaction {
    private ArrayList<String> ioEscritas = new ArrayList<String>();
    private Transaction ioInner;
    private Boolean ibOpen = true;
 
    public void AddEscrita(String asEscrita){
        if (this.HasInner())
            this.ioInner.AddEscrita(asEscrita);
        else
            this.ioEscritas.add(asEscrita);
    }
 
    public ArrayList<String> GetEscritas(){
        return this.ioEscritas;
    }
 
    private Boolean HasInner(){
        return (this.ioInner != null);
    }
 
    public void Begin(){
        if (this.HasInner()) {
            this.ioInner.Begin();
        }
        else {
            this.ioInner = new Transaction();
        }
    }
 
    public Boolean Commit(){
        if (this.HasInner()){
            if (this.ioInner.Commit()){
                ArrayList<String> loEscritasInner = this.ioInner.GetEscritas();
                this.ioInner = null;
                for (String lsEscrita : loEscritasInner)
                    this.AddEscrita(lsEscrita);
            }
        }
        else {
            this.ibOpen = false;
        }
        return !this.ibOpen;
    }
 
    public Boolean RollBack() {
        if (!this.HasInner()) {
            this.ibOpen = false;
        }
        else {
            if (this.ioInner.RollBack())
                this.ioInner = null;
        }
        return !this.ibOpen;
    }
}