DatoRLongAdder.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package org.openspcoop2.pdd.core.controllo_traffico.policy.driver.redisson.counters;

import java.util.concurrent.CompletionStage;

import org.openspcoop2.pdd.config.OpenSPCoop2Properties;
import org.openspcoop2.pdd.logger.OpenSPCoop2Logger;
import org.openspcoop2.utils.Utilities;
import org.openspcoop2.utils.UtilsRuntimeException;
import org.redisson.api.RLongAdder;
import org.redisson.api.RedissonClient;
import org.slf4j.Logger;

/**
 * DatoRLongAdder
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */

public class DatoRLongAdder {

    private RedissonClient redisson;
    private String name;
    
    private RLongAdder counter;
    
    private int failover = -1;
    public void setFailover(int failover) {
        this.failover = failover;
    }
    private int failoverCheckEveryMs = -1;
    
    private Logger logControlloTraffico;
    
    public DatoRLongAdder(RedissonClient redisson, String name) {
        this.redisson = redisson;
        this.name = name;
        this.initCounter();
        OpenSPCoop2Properties op2Props = OpenSPCoop2Properties.getInstance();
        this.failover = -1; // da gestire in futuro se serve
        this.failoverCheckEveryMs = -1;
        this.logControlloTraffico = OpenSPCoop2Logger.getLoggerOpenSPCoopControlloTraffico(op2Props.isControlloTrafficoDebug());
    }
    private void initCounter() {
        this.counter = this.redisson.getLongAdder(this.name);
    }
    
    public long sum() {
        RLongAdderResponse r = process(RLongAdderOperation.SUM, -1, -1);
        return r!=null ? r.valueL : -1; // else non dovrebbe succedere mai
    }
    public void add(long value) {
        process(RLongAdderOperation.ADD, value, -1);
    }
    public void increment() {
        process(RLongAdderOperation.INCREMENT, -1, -1);
    }
    public void decrement() {
        process(RLongAdderOperation.DECREMENT, -1, -1);
    }
    public void reset() {
        process(RLongAdderOperation.RESET, -1, -1);
    }
    public void destroy() {
        process(RLongAdderOperation.DESTROY, -1, -1);
    }
    
    private RLongAdderResponse process(RLongAdderOperation op, long arg1, long arg2) {
        String prefix = "[Redis-RAtomicLong-"+this.name+" operation:"+op+"] ";
        if(this.failover>0) {
            return processFailOver(prefix, op, arg1, arg2);
        }
        else {
            return operation(prefix, op, arg1, arg2);
        }
    }
    private RLongAdderResponse processFailOver(String prefix, RLongAdderOperation op, long arg1, long arg2) {
        boolean success = false;
        Exception eFinal = null; // capire l'eccezione
        RLongAdderResponse v = null;
        for (int i = 0; i < this.failover; i++) {
            try {
                if(i>0 && this.failoverCheckEveryMs>0) {
                    Utilities.sleep(this.failoverCheckEveryMs);
                    initCounter();
                }
                v = operation(prefix, op, arg1, arg2);
                success=true;
                break;
            } catch (Exception e) {
                eFinal = e;
                if(i==0) {
                    this.logControlloTraffico.error(prefix+"rilevato contatore distrutto (verrà riprovata la creazione): "+e.getMessage(),e);
                }
                else {
                    this.logControlloTraffico.error(prefix+"il tenativo i="+i+" di ricreare il contatore è fallito: "+e.getMessage(),e);
                }
            }
        }
        if(!success) {
            throwDistributedObjectDestroyedException(prefix, eFinal);
        }
        return v;
    }
    private void throwDistributedObjectDestroyedException(String prefix, Exception eFinal) {
        String msg = prefix+"tutti i tentativi di ricreare il contatore sono falliti";
        this.logControlloTraffico.error(msg);
        if(eFinal!=null) {
            throw new UtilsRuntimeException(eFinal);
        }
        else {
            throw new UtilsRuntimeException("tutti i tentativi di ricreare il contatore sono falliti"); // l'eccezione eFinal esiste
        }
    }
    
    private RLongAdderResponse operation(String prefix, RLongAdderOperation op, long arg1, long arg2){
        switch (op) {
        case SUM:
            return new RLongAdderResponse(this.counter.sum());
        case ADD:
            this.counter.add(arg1);
            return null;
        case INCREMENT:
            this.counter.increment();
            return null;
        case DECREMENT:
            this.counter.decrement();
            return null;
        case RESET:
            this.counter.reset();
            return null;
        case DESTROY:
            try {
                this.counter.destroy();
            }catch(Throwable e) {
                this.logControlloTraffico.error(prefix+"delete non riuscito: "+e.getMessage(),e);
                throw e;
            }
            return null;        
        }
        return null;
    }
}

enum RLongAdderOperation {
    SUM,
    ADD, INCREMENT, DECREMENT,
    RESET,
    DESTROY
}

class RLongAdderResponse{
    RLongAdderResponse(long l){
        this.valueL = l;
    }
    RLongAdderResponse(boolean b){
        this.valueB = b;
    }
    RLongAdderResponse(CompletionStage<Long> v){
        this.valueAsync = v;
    }
    long valueL;    
    boolean valueB;
    CompletionStage<Long> valueAsync;
}