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package com.sun.ejb.spi.distributed;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import java.util.logging.Logger;
import java.util.logging.Level;

import com.sun.logging.LogDomains;

import java.util.concurrent.ConcurrentHashMap;

public class DistributedEJBServiceFactory
    implements DistributedEJBService 
{

    private static final Logger _logger = 
        LogDomains.getLogger(LogDomains.EJB_LOGGER);
    
    protected static DistributedEJBService distributedEJBService = null;
    protected static DistributedEJBTimerService distributedEJBTimerService = null;

    private static DistributedReadOnlyBeanService _distributedReadOnlyBeanService
        = new DistributedReadOnlyBeanServiceImpl();
    public static DistributedEJBService getDistributedEJBService() {
        if(distributedEJBService == null) {
            distributedEJBService = new DistributedEJBServiceFactory();
        } 

        return distributedEJBService;
    }

    protected DistributedEJBServiceFactory() {
        distributedEJBService = this;
    }


    public static void setDistributedEJBTimerService( 
        DistributedEJBTimerService distribEJBTimerService ) {
        
        getDistributedEJBService();

        //The distributedEJBTimerService is the EJBTimerService that should
        //be assigned as part of the server startup. Also this code makes sense
        //in the appserv-core part of the land. But since this method is on the
        //interface even the appserv-core-ee code might call it. Need to safeguard
        //against this possibility.
        if( null == distributedEJBTimerService ) {
            distributedEJBTimerService = distribEJBTimerService;
        }
    }

    /**
     *--------------------------------------------------------------
     * Methods to be implemented for DistributedEJBService
     *--------------------------------------------------------------
     */
    public int migrateTimers( String serverId ) {
        int result = 0;
        if (distributedEJBTimerService != null) {
            result = distributedEJBTimerService.migrateTimers( serverId );
        } else {
            //throw new IllegalStateException("EJB Timer service is null. "
                    //+ "Cannot migrate timers for: " + serverId);
        }
        
        return result;
    }

    public String[] listTimers( String[] serverIds ) {
        String[] result = new String[serverIds.length];
        if (distributedEJBTimerService != null) {
            result = distributedEJBTimerService.listTimers( serverIds );
        } else {
            //FIXME: Should throw IllegalStateException
            for (int i=0; i<serverIds.length; i++) {
                result[i] = "0";
            }
            //throw new com.sun.enterprise.admin.common.exception.AFException("EJB Timer service is null. "
                    //+ "Cannot list timers.");
        }
        
        return result;
    }

    public void setPerformDBReadBeforeTimeout( boolean defaultDBReadValue ) {
        if( null != distributedEJBTimerService ) {
            distributedEJBTimerService.setPerformDBReadBeforeTimeout( 
                                           defaultDBReadValue );
        } else {
            // Should we ensure that the EJBTimerService can not be null
            // in the case of SE/EE
        }
    }

    public DistributedReadOnlyBeanService getDistributedReadOnlyBeanService() {
        return _distributedReadOnlyBeanService;
    }

} //DistributedEJBServiceFactory.java