Discuss the use analysis of Hessian in PHP_PHP tutorial

What is Hessian
Hessian is an open source remote communication protocol provided by caucho.
Using binary RPC protocol, based on HTTP transmission, there is no need to open another firewall port on the server side.
The specification of the protocol is public and can be used in any language.
Use client/server mode.
The requester is a client, and the service provider is a server.
The client calling process sends a calling message with process parameters to the service process, and then waits for the response message.
On the server side, the process remains in sleep state until the call information arrives.
When a call message arrives, the server obtains the process parameters, calculates the result, sends a reply message, and then waits for the next call message. Finally, the client calls the process to receive the reply message,
obtains the process result, and then the call execution continues .

Hessian protocol workflow chart
Client program requests server function
1. Call the client handle and execute the transmission parameters.
2. Call the local system kernel to send network messages.
3. The message is sent to the remote host.
　4. The server handle gets the message and gets the parameters.
5. Execute remote process.



The server function returns the result to the client
　1. The execution process returns the result to the server handle.
2. The server handle returns the result and calls the remote system kernel.
3. The message is sent back to the local host.
4. The client handle receives messages from the kernel.
5. The client receives the data returned by the handle.

With source code explanation

1. Reference the configuration file, including the website root directory and the address of Hessian.

Copy code The code is as follows:

/**
* File name : config.php
* Purpose : Hessian configuration file
*
* @package system.core.code applied to the whole site
* @copyright Copyright (c) 2012
* @since 1.0
*/

//Root directory
define( 'PATH' , dirname(__FILE__) . DIRECTORY_SEPARATOR );

// Hessian Url address
define( 'HESSIAN_URL' , 'http://qx.com/server.php' );

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2. Configure the server.

Copy code The code is as follows:

/**
* File name : server.php
*
* References :
* 1.http://hessian.caucho.com/ (Hessian homepage)
* 2.http:/ /hessianphp.sourceforge.net/ (Hessian PHP)
* 3.http://sourceforge.net/projects/hessianphp/ (Hessian PHP open source)
* 4.http://baike.baidu.com/ view/1859857.htm (single case mode)
*
* @author wubaiqing
* @package system.core applied to the whole site
* @copyright Copyright (c) 2012
* @since 1.0
*/
require_once ( dirname(__FILE__) . DIRECTORY_SEPARATOR . 'config.php' );
require_once ( PATH . 'extensions/HessianPHP/HessianService.php' );

class HessianServer
{
public function __construct() {}
/**
* Product details API interface
* @param string $title title
* @param int $price price
*/
public function goodsInfomationApi( $title , $price ) {
$price = (int) $price;
return '

Use Hessian protocol to call remote Method.

Title:' . $title . '
Price:'.$price;
}
}

$server = new HessianService( new HessianServer() );
//$server->displayInfo();
$server->handle();

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3. You can check how many communication methods are enabled through the displayInfo method in the HessianService class.
If you need to use the handle method to build the server, if the Hessian Requires POST prompt appears, the server has been built successfully.

4. Encapsulate Hessian interface

Copy code The code is as follows:

/**
 * 类名        : HessianApi
 *
 * 参考资料    :
 * 1.http://hessian.caucho.com/ ( Hessian主页 )
 * 2.http://hessianphp.sourceforge.net/ ( Hessian PHP )
 * 3.http://sourceforge.net/projects/hessianphp/ ( Hessian PHP开源 )
 * 4.http://baike.baidu.com/view/1859857.htm ( 单例模式 )
 *
 * @author wubaiqing
 * @package system.core applied to the whole site
 * @copyright Copyright (c) 2012
 * @since 1.0
 */
class HessianApi
{
    /**
     * @var string 接口地址
     */
    private $_url = NULL;

    /**
     * @var result 句柄
     */
    private $_handle = NULL;

    /**
     * @var array 存放单例模式数组
     */
    private static $_objects = array();

    /**
     * 设置URL地址
     * 实例化HessianClient类
     * 参数    : (1) url地址 , 2
     *
     * 2.Java调用字段
     * @param string $url
     */
    public function __construct( $url )
    {
        $this->setUrl( $url );
        $handler = new HessianClient ( $this->getUrl (), $this->getOptions () );
        $this->setHandler ( $handler );
    }

    /**
     * @return result $_handle 句柄
     */
    public function getHandler() {
        return $this->_handle;
    }

    /**
     * 设置句柄
     * @param result $_handle
     */
    public function setHandler($_handle) {
        $this->_handle = $_handle;
    }

    /**
     * 获取URL地址
     */
    public function getUrl() {
        return $this->_url;
    }

    /**
     * 设置URL地址
     * @param string $url
     */
    public function setUrl($url) {
        $this->_url = $url;
    }

    /**
     * typeMap映射Java等平台对象
     * @return array
     */
    public function getOptions() {
        return array (
　　　　　　'version' => 1,
　　　　　　'saveRaw' => TRUE,
　　　　　　'typeMap' => array(
　　　　　　　　'JavaNullPointException' => 'java.lang.NullPointerException' ,
　　　　　　　　'StackTraceElement' => 'java.lang.StackTraceElement')
　　　　　);
    }

    /**
     * 记录接口调用信息
     * @param string $method 调用的方法
     * @param string $returnMsg 需要记入log的文字信息
     */
    public function resultLog( $method , $returnMsg )
    {
        $logPath = PATH.'/runtime/hessian/';
        if( !is_dir( $logPath ) ) {
            mkdir($logPath,0777);
        }
        error_log(date('Ymd H:i:s', time()) . '|' . $method . '|' . $returnMsg."\n", 3, $logPath . date('Y-m-d', time()) . '.log');
    }

/**
* Static factory method, generates a unique instance of a single URL
* @param string $url
*/
public static function start( $url )
{
$key = md5( $url );

if ( isset(self: ; ;
                                 return self::$_objects[$key];                                      
class JavaNullPointException extends Exception {}

class StackTraceElement extends Exception {}

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?>

5. Encapsulate the client request method and inherit the HessianApi class

Copy code
The code is as follows:

/** * Class name : Goods * Inherited class : HessianApi * Purpose : Call server.php method

*

* @author wubaiqing
* @package system.core.code applied to the whole site
* @copyright Copyright (c) 2012
* @since 1.0
*/
class Goods extends HessianApi
{
/**
* Set interface address
* @param string $url
* /
public function __construct( $url ) {
parent::__construct( $url );
}

/**
* Get product information
* Call the goodsInfomationApi method in the server.php file
* @param string $title title
* @param string $title price
*/ public function getGoodsInfomation( $title, $price )

{
// If you call the hessian service of the java platform, you need to specify the type of parameters you pass, especially Integers and strings.
$price = (int) $price;

$result = $this->getHandler()->goodsInfomationApi( $title, $price);
$ this->resultLog( 'getGoodsInfomation' , 'Access interface, but the interface is not logically verified.');
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6. Modify index.php to request the server interface

Copy code

The code is as follows:

/**
* File name: index.php*

* Reference:* 1.http://hessian.caucho.com/ (Hessian homepage)* 2.http:/ /hessianphp.sourceforge.net/ (Hessian PHP)* 3.http://sourceforge.net/projects/hessianphp/ (Hessian PHP open source)* 4.http://baike.baidu.com/ view/1859857.htm (single case mode)

*

* @author wubaiqing
* @package system.core applied to the whole site
* @copyright Copyright (c) 2012
* @since 1.0
*/


require_once ( dirname(__FILE__) . DIRECTORY_SEPARATOR .'config.php' );

// Hessian extension and configuration files
require_once (PATH . 'extensions/HessianPHP/HessianClient.php' );
require_once (PATH . 'class/HessianApi.php' );


// Call server.php method
require_once (PATH . 'class/Goods.php');

// Request the interface to obtain data
$goods = new Goods( HESSIAN_URL );

//Set product title and price.
$title = 'Beijing Mobile Recharge Platform';
$price = '50';

//Request Hessian protocol
$goodsInfo = $goods->getGoodsInfomation( (string) $title , (int) $price );

//Print request result

echo ( $goodsInfo );

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?>

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