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In this article Barry Mavin, CEO and Chief Software Architect for Recital details how to Build C Extension Libraries to use with Recital.

Overview

It is possible to extend the functionaliy of Recital products using "Extension libraries" that can be written in C. These extension libraries, written using the Recital/SDK API, are dynamically loadable from all Recital 9 products. This includes:

  • Recital
  • Recital Server
  • Recital Web

Building C Extension Libraries

You can create C wrappers for virtually any native operating system function and access these from the Recital 4GL. Unlike traditional APIs which only handle the development of C functions that are callable from the 4GL, the Recital/SDK allows you to build Classes that are accessible from all Recital products. e.g. You could create a GUI framework for Linux that handles VFP system classes!

To deploy your C Extension Libraries, copy them to the following location:

Windows:

\Program Files\Recital\extensions

Linux/Unix:

/opt/recital/extensions

Please see the Recital/SDK API Reference documentation for further details.

Sample code

Listed below is the complete example of a C Extension Library.:

////////////////////////////////////////////////////////////////////////////////
#include "mirage_demo.h"  
      
////////////////////////////////////////////////////////////////////////////////
// Declare your functions and classes below as follows:
//
//    Recital Function Name, C Function Name, Type (Function or Class)
//
#define MAX_ELEMENTS    7
static  struct  API_SHARED_FUNCTION_TABLE api_function_table[MAX_ELEMENTS] = {
        {"schar",   "fnSamplesCharacter",   API_FUNCTION},
        {"stype",   "fnSamplesType",           API_FUNCTION},
        {"slog",    "fnSamplesLogical",        API_FUNCTION},
        {"snum",    "fnSamplesNumeric",    API_FUNCTION},
        {"sopen",   "fnSamplesOpen",         API_FUNCTION},
        {"myclass", "clsMyClass",               API_CLASS},
        {NULL,      NULL,                   -1}
};

////////////////////////////////////////////////////////////////////////////////
// Recital API initialization. This should be in only ONE of your C files
// **IT SHOULD NEVER BE EDITED OR REMOVED**  
INIT_API;


///////////////////////////////////////////////////////////////////////
// This is an example of passing a character parameter and returning one.
RECITAL_FUNCTION fnSamplesCharacter(void)
{
    char    *arg1;
    
    if (!_parse_parameters(PCOUNT, "C", &arg1)) { 
        ERROR(-1, "Incorrect parameters");
    }
    
    _retc(arg1);
}


///////////////////////////////////////////////////////////////////////
// This is an example of passing a numeric parameter and returning one.
RECITAL_FUNCTION fnSamplesNumeric(void)
{
    int arg1;
    
    if (!_parse_parameters(PCOUNT, "N", &arg1)) { 
        ERROR(-1, "Incorrect parameters");
    }
    
    _retni(arg1);
}


///////////////////////////////////////////////////////////////////////
// This is an example returns the data type of the parameter passed.
RECITAL_FUNCTION fnSamplesType(void)
{
    char    result[10];

    if (PCOUNT != 1) { 
        ERROR(-1, "Incorrect parameters");
    }
    
    switch (_parinfo(1)) {
        case API_CTYPE:
            strcpy(result, "Character");
            break;
        case API_NTYPE:
            strcpy(result, "Numeric");
            break;
        case API_LTYPE:
            strcpy(result, "Logical");
            break;
        case API_DTYPE:
            strcpy(result, "Date");
            break;
        case API_TTYPE:
            strcpy(result, "DateTime");
            break;
        case API_YTYPE:
            strcpy(result, "Currency");
            break;
        case API_ATYPE:
            strcpy(result, "Array");
            break;
        default:
            strcpy(result, "Unkown");
            break;
    }

    _retc(result);
}


///////////////////////////////////////////////////////////////////////
// This is an example returns "True" or False.
RECITAL_FUNCTION  fnSamplesLogical(void)
{
    char    result[10];
    int     arg1;
    
    if (!_parse_parameters(PCOUNT, "L", &arg1)) { 
        ERROR(-1, "Incorrect parameters");
    }
    
    if (arg1) strcpy(result, "True");
    else strcpy(result, "False");

    _retc(result);
}


///////////////////////////////////////////////////////////////////////
// This example opens a table.
RECITAL_FUNCTION fnSamplesOpen(void)
{
    char    *arg1;
    
    if (!_parse_parameters(PCOUNT, "C", &arg1)) { 
        ERROR(-1, "Incorrect parameters");
    }
    
    if (_parinfo(1) == API_CTYPE) {
        _retni(COMMAND(arg1));
    } else {
        _retni(-1);
    }
}

///////////////////////////////////////////////////////////////////////
// Define the MyClass CLASS using the API macros
///////////////////////////////////////////////////////////////////////
RECITAL_EXPORT int DEFINE_CLASS(clsMyClass)
{
    /*-------------------------------------*/ 
    /* Dispatch factory methods and return */
    /*-------------------------------------*/
    DISPATCH_FACTORY();
 
    /*---------------------------------*/
    /* Dispatch constructor and return */ 
    /*---------------------------------*/ 
    DISPATCH_METHOD(clsMyClass, Constructor);

    /*--------------------------------*/
    /* Dispatch destructor and return */
    /*--------------------------------*/
    DISPATCH_METHOD(clsMyClass, Destructor); 

    /*-----------------------------------*/
    /* Dispatch DEFINE method and return */
    /*-----------------------------------*/
    DISPATCH_METHOD(clsMyClass, Define);

    /*------------------------------*/
    /* Dispatch SET or GET PROPERTY */
    /* method for property NumValue */
    /* then return.                 */
    /*------------------------------*/
    DISPATCH_PROPSET(clsMyClass, NumValue);
    DISPATCH_PROPGET(clsMyClass, NumValue); 

    /*------------------------------*/
    /* Dispatch SET or GET PROPERTY */
    /* method for property LogValue */
    /* then return.                 */
    /*------------------------------*/
    DISPATCH_PROPSET(clsMyClass, LogValue);
    DISPATCH_PROPGET(clsMyClass, LogValue);

    /*-------------------------------*/
    /* Dispatch SET or GET PROPERTY  */
    /* method for property DateValue */
    /* then return.                 */
    /*-------------------------------*/
    DISPATCH_PROPSET(clsMyClass, DateValue);
    DISPATCH_PROPGET(clsMyClass, DateValue);

    /*-------------------------------*/
    /* Dispatch SET or GET PROPERTY  */
    /* method for property TimeValue */
    /* then return.                  */
    /*-------------------------------*/
    DISPATCH_PROPSET(clsMyClass, TimeValue);
    DISPATCH_PROPGET(clsMyClass, TimeValue);
 
    /*-------------------------------*/
    /* Dispatch SET or GET PROPERTY  */
    /* method for property CurrValue */
    /* then return.                  */
    /*-------------------------------*/
    DISPATCH_PROPSET(clsMyClass, CurrValue);
    DISPATCH_PROPGET(clsMyClass, CurrValue);

    /*-------------------------------*/
    /* Dispatch SET or GET PROPERTY  */
    /* method for property CharValue */
    /* then return.                  */
    /*-------------------------------*/
    DISPATCH_PROPSET(clsMyClass, CharValue); 
    DISPATCH_PROPGET(clsMyClass, CharValue);

    /*------------------------------*/
    /* Dispatch SET or GET PROPERTY */ 
    /* method for property ObjValue */ 
    /* then return.                 */
    /*------------------------------*/
    DISPATCH_PROPSET(clsMyClass, ObjValue);
    DISPATCH_PROPGET(clsMyClass, ObjValue);

    /*-----------------------------------*/
    /* If message not found return error */
    /*-----------------------------------*/
    OBJECT_RETERROR("Unknown message type");
}

////////////////////////////////////////////////////////////////////////////////
// Define METHOD handlers
////////////////////////////////////////////////////////////////////////////////
DEFINE_METHOD(clsMyClass, Constructor) 
{
        struct example_data *objectDataArea;

        /* Allocate memory for objects objectData area */
        objectDataArea = (struct example_data *) 
           malloc(sizeof(struct example_data));
        if (objectDataArea == NULL) return(-1);
    
        /* Assign the default property values */
        strcpy(objectDataArea->prop_charvalue, "Test API object");
        objectDataArea->prop_numvalue = 15.2827;
        objectDataArea->prop_logvalue = 'F';
        strcpy(objectDataArea->prop_datevalue, DATE_DATE());
        strcpy(objectDataArea->prop_timevalue, DATE_DATETIME());
        strcpy(objectDataArea->prop_currvalue, "15.2827");
        strcpy(objectDataArea->object_name, "APIobject");
        objectDataArea->prop_objvalue 
             = OBJECT_NEW(objectDataArea->object_name, "exception", NULL);
    
        /* Set the object objectData area */
        OBJECT_SETDATA((char *)objectDataArea);
    
        return(0);
}
  
DEFINE_METHOD(clsMyClass, Destructor) 
{
        struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();

        if (objectData != NULL) {
            if (objectData->prop_objvalue != NULL) 
              OBJECT_DELETE(objectData->prop_objvalue);
            free(objectData);
            objectData = NULL;
        }
        return(0);
}

DEFINE_METHOD(clsMyClass, Define) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();
    struct      API_EXPRESSION result;
    char        buffer[512];
    int         rc;

/* Check the object class */
    OBJECT_GETPROPERTY(objectData->prop_objvalue, "class", buffer);
    rc = OBJECT_GETARG(buffer, &result);
    if (result.errno == 0 && result.type == 'C' 
        && strcmp(result.character, "Exception") == 0) { 
        switch (OBJECT_GETARGC()) {
            case 1: 
                rc = OBJECT_GETPARAMETER(1, &result);
                if (result.errno == 0 && result.type == 'C') {
                    OBJECT_SETARG(buffer, &result);
                    rc = OBJECT_SETPROPERTY(objectData->prop_objvalue,
                         "message", buffer);
                }
                break;
            case 2: 
                rc = OBJECT_GETPARAMETER(2, &result);
                if (result.errno == 0 && result.type == 'N') {
                    OBJECT_SETARG(buffer, &result);
                    rc = OBJECT_SETPROPERTY(objectData->prop_objvalue,
                         "errorno", buffer);
                }
         }
    }

    result.type = 'L';
    result.logical = (rc == 0 ? 'T' : 'F');  
    OBJECT_RETRESULT(&result);
}

////////////////////////////////////////////////////////////////////////////////
// Define GET property handlers
////////////////////////////////////////////////////////////////////////////////
DEFINE_PROPERTYGET(clsMyClass, NumValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();

    if (objectData == NULL) return(-1);

    OBJECT_RETPROPERTY('N', objectData->prop_numvalue);
}

DEFINE_PROPERTYGET(clsMyClass, LogValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();

    if (objectData == NULL) return(-1);

    OBJECT_RETPROPERTY('L', objectData->prop_logvalue);
}  

DEFINE_PROPERTYGET(clsMyClass, DateValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();

    if (objectData == NULL) return(-1);

    OBJECT_RETPROPERTY('D', objectData->prop_datevalue);
}

DEFINE_PROPERTYGET(clsMyClass, TimeValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();

    if (objectData == NULL) return(-1);

    OBJECT_RETPROPERTY('T', objectData->prop_timevalue);
}

DEFINE_PROPERTYGET(clsMyClass, CurrValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();

    if (objectData == NULL) return(-1);

    OBJECT_RETPROPERTY('Y', objectData->prop_currvalue);
}

DEFINE_PROPERTYGET(clsMyClass, CharValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();

    if (objectData == NULL) return(-1);

    OBJECT_RETPROPERTY('C', objectData->prop_charvalue);
}

DEFINE_PROPERTYGET(clsMyClass, ObjValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();

    if (objectData == NULL) return(-1);

    OBJECT_RETPROPERTY('O', objectData->prop_objvalue);
} 


////////////////////////////////////////////////////////////////////////////////
// Define SET property handlers
////////////////////////////////////////////////////////////////////////////////
DEFINE_PROPERTYSET(clsMyClass, NumValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();
    struct API_EXPRESSION result;
    int rc = OBJECT_ERROR;

    OBJECT_GETVALUE(&result);
    if (result.errno == 0 && result.type == 'N') {
        objectData->prop_numvalue = result.number;
        rc = OBJECT_SUCCESS;
    }

    return(rc);
}

DEFINE_PROPERTYSET(clsMyClass, LogValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();
    struct API_EXPRESSION result;
    int rc = OBJECT_ERROR;

    OBJECT_GETVALUE(&result);
    if (result.errno == 0 && result.type == 'L') {
        objectData->prop_logvalue = result.logical;
        rc = OBJECT_SUCCESS;
    }

    return(rc);
}

DEFINE_PROPERTYSET(clsMyClass, DateValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();
    struct API_EXPRESSION result;
    int rc = OBJECT_ERROR;
    OBJECT_GETVALUE(&result);
    if (result.errno == 0 && result.type == 'D') {
        strcpy(objectData->prop_datevalue, DATE_DTOS(result.date));
        rc = OBJECT_SUCCESS;
    }

    return(rc);
}

DEFINE_PROPERTYSET(clsMyClass, TimeValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();
    struct API_EXPRESSION result;
    int rc = OBJECT_ERROR;

    OBJECT_GETVALUE(&result);
    if (result.errno == 0 && result.type == 'T') {
        strcpy(objectData->prop_timevalue, DATE_TTOS(result.datetime));
        rc = OBJECT_SUCCESS;
    }

    return(rc); 
}

DEFINE_PROPERTYSET(clsMyClass, CurrValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();
    struct API_EXPRESSION result;
    int rc = OBJECT_ERROR;

    OBJECT_GETVALUE(&result);
    if (result.errno == 0 && result.type == 'Y') {
        strcpy(objectData->prop_currvalue, CURR_YTOS(result.currency));
        rc = OBJECT_SUCCESS;
    }

    return(rc);
}

DEFINE_PROPERTYSET(clsMyClass, CharValue)  
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();
    struct API_EXPRESSION result;
    int rc = OBJECT_ERROR;

    OBJECT_GETVALUE(&result);
    if (result.errno == 0 && result.type == 'C') {
        strcpy(objectData->prop_currvalue, result.character);
        rc = OBJECT_SUCCESS;
    }

    return(rc);
}

DEFINE_PROPERTYSET(clsMyClass, ObjValue) 
{
    struct example_data *objectData = (struct example_data *)OBJECT_GETDATA();
    OBJECT  objvalue;
    int rc = OBJECT_ERROR;

    if (OBJECT_GETTYPE() == 'O') {
        objvalue = OBJECT_GETOBJECT(); 
        objectData->prop_objvalue = OBJECT_ASSIGN(objvalue, objectData->object_name);
        rc = OBJECT_SUCCESS;
    }

    return(rc);
}
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Recital 10 introduced a FOREACH command, much like PHP and some other languages. This simply gives an easy way to iterate over arrays. foreach works on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable. There are two syntaxes; the second is a minor but useful extension of the first:
FOREACH array_expression AS value
    statements...
ENDFOR
FOREACH array_expression AS key => value statements... ENDFOR
The first form loops over the array given by array_expression. On each loop, the value of the current element is assigned to value and the internal array pointer is advanced by one (so on the next loop, you'll be looking at the next element).
The second form does the same thing, except that the current element's key will be assigned to the variable key on each loop. This form works only on associative arrays and objects.
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When you start the loadbalancer.org appliance you will see the following:

Default login:
Username: root
Password: loadbalancer

Access to webclient from an external client is:
http://192.168.1.129:9080
http://192.168.1.129:9443

You can access the web administrator using the IP and ports described onscreen.

For the sri lanka porject we are looking for performance and the network diagram indicates we are happy to have the cluster on the same subnet as the rest of the network.

Direct routing is the fasted performance possible, it has the advantage over NAT that the Loadbalancer does not become a bottleneck for incoming and outgoing packets. With DR the loadbalancer simply examines incoming packets and the servers to route the packets directly back to the requesting user.

The web interfaceis the only way to fully configure the loadbalancer vm. The console tool lbwizard will get it initiallised and any further configurations can then be done via the webinterface.

Using lbwizard for the Sri lanka configuration follow these steps.

On the first Loadbalancer:

//Start

Is this unit part for a HA Pair?
YES

Have you already setup the Slave?
NO

Is this a one-armed configuration?
YES

Enter the IP Address for the interface eth0?
Enter IP address you wish to be assigned to the SLAVE loadbalancer.

Enter the netmask for interface eth0?
Enter netmask for the subnet.

Enter the Floating IP adrress?
Enter the IP address that will be IP assosiacted the the HA-pair of loadbalancers.

//Finish

On the 2nd loadbalancer VM, run the lbwizard.

//Start

Is this unit part of an HA-Pair?
YES

Have you already set up the Slave?
YES

What is the slave units UP address?
Enter the IP which you entered when configuring the other loadbalancer VM.

Is this a one-armed configuration?
YES

Enter the IP Address for the interface eth0?
Enter the IP that will be assigned to the MASTER loadbalancer

Enter the netmask for interface eth0?
Enter the subnet netmask.

Enter the Floating IP address?
Enter the IP address that will be IP assosiacted the the HA-pair of loadbalancers.

Enter the address of the default gateway?
Enter the deafult gateway for the subnet.

Enter the IP of the nameserver?
Enter the dns server.

Enter the port for the first Virtual server?
Enter 22 for ssh

Enter the IP address of the first real server?
Enter the real IP of the first appserver

//Finish

Now this is complete we need to go to the web admin interface to configure the 2nd Real Server. As the lbwizard program will only allow you to configure 1 real server.

Now login to the web admin using the default password:

username: loadbalancer
password: loadbalancer

Note: Connect to the IP you have now set for your master loadbalancer

Goto the edit configuration tab

Now click add a real server:

Enter a label
IP address of the server plus the port of the service i.e. 192.168.1.125:22


Edit Configuration -> Virtual Servers

persistancte -> NO

Scheduler-> LC
LC - Least-Connection: assign more jobs to real servers with
fewer active jobs.

Service to check -> custom1

Check port -> 22

Forwarding Method -> DR

Feedback Method -> Agent

Arp Problem when using DR

Every real server must be configured to respond to the VIP address as well as the RIP
address.

You can use iptables (netfilter) on the real server to re-direct incoming packets destined for the virtual
server IP address.

This is a simple case of adding the following command to your start up script (rc.local):

//replace 10.0.0.21 with the Virtual Server IP
iptables -t nat -A PREROUTING -p tcp -d 10.0.0.21 -j REDIRECT

chkconfig iptables on

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Subclipse is an Eclipse Team Provider plug-in providing support for Subversion within the Eclipse IDE. This plugin is required in order to use the recital eclipse workspace.
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Recital 10 introduced the ECHO command. This command operates in the same way as the PHP ECHO command. It does not append a newline to the output but rather operates in the same way as the existing ?? command in Recital. The string being output can contain C-style string escapes \n \t or \r (newline, tab and carriage return respectively) e.g.
echo "Hello world\n"
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Many motherboards nowadays have integrated gigabit ethernet that use the Realtek NIC chipset.

The Realtek r8168B network card does not work out of the box in Redhat/Centos 5.3: instead of loading the r8168 driver, modprobe loads the r8169 driver, which is broken as can be seen with ifconfig which shows large amounts of dropped packets. A solution is to download the r8168 driver from the Realtek website and install it using the following steps:

Check whether the built-in driver, r8169.ko (or r8169.o for kernel 2.4.x), is installed.

# lsmod | grep r8169

If it is installed remove it.

# rmmod r8169

Download the R8168B linux driver from here into /root.

Unpack the tarball :

# cd /root
# tar vjxf r8168-8.012.00.tar.bz2

Change to the directory:

# cd r8168-8.012.00

If you are running the target kernel, then you should be able to do :

# make clean modules   
# make install
# depmod -a
# insmod ./src/r8168.ko (or r8168.o in linux kernel 2.4.x)

make sure modprobe knows not to use r8169, and that depmod doesn’t find the r8169 module.

# echo "blacklist r8169" >> /etc/modprobe.d/blacklist
# mv /lib/modules/`uname -r`/kernel/drivers/net/r8169.ko   \ /lib/modules/`uname -r`/kernel/drivers/net/r8169.ko.bak

You can check whether the driver is loaded by using the following commands.

# lsmod | grep r8168
# ifconfig -a

If there is a device name, ethX, shown on the monitor, the linux driver is loaded. Then, you can use the following command to activate it.

# ifconfig ethX up

After this you should not see any more dropped packets reported.

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In this article Barry Mavin, CEO and Chief Software Architect for Recital debunks the myths and misrepresentations surrounding XBase and explains how Recital, an enterprise-class XBase platform, has overcome all the shortfalls and weaknesses of early XBase implementations.

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After an extended period of intense software development, we are pleased to announce the release of Recital 10 which is a milestone in our development efforts.
 
Recital 10 is comprised of major new versions of all of our products (which are all now Cluster Ready) as well as some new products, and a collection of open source technologies fully supported by ourselves to our customer base. 

The Recital 10 release notes can be found here.
  • Recital

    A powerful scripting language with an embedded database used for developing desktop database applications on Linux and Unix.

  • Recital Server

    A cross-platform SQL database and application server.

  • Recital Web

    A server-side scripting language with an embedded SQL database for creating web 2.0 web applications.

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