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EventBufferEvent (class)

The EventBufferEvent class

Introduction

(PECL event >= 1.2.6-beta)

代表Libevent的缓冲区事件。

通常应用程序想要执行一些数据缓冲,而不仅仅是响应事件。例如,当我们想写数据时,通常的模式看起来像:

  • 确定我们想要将一些数据写入连接; 把这些数据放入缓冲区。

2. 等待连接变为可写

3. 尽可能多地写入数据

4. 请记住我们写了多少,如果我们还有更多的数据要写入,请等待连接再次变为可写。

这种缓冲I / O模式非常普遍,Libevent为它提供了一个通用机制。“缓冲区事件”由底层传输(如套接字),读取缓冲区和写入缓冲区组成。当底层传输已准备好被读取或写入时,它会提供回调,而不是常规事件,缓冲区事件在读取或写入足够数据时调用其用户提供的回调。

课程简介

final EventBufferEvent {

/* Constants */

const integer READING = 1 ;

const integer WRITING = 2 ;

const integer EOF = 16 ;

const integer ERROR = 32 ;

const integer TIMEOUT = 64 ;

const integer CONNECTED = 128 ;

const integer OPT_CLOSE_ON_FREE = 1 ;

const integer OPT_THREADSAFE = 2 ;

const integer OPT_DEFER_CALLBACKS = 4 ;

const integer OPT_UNLOCK_CALLBACKS = 8 ;

const integer SSL_OPEN = 0 ;

const integer SSL_CONNECTING = 1 ;

const integer SSL_ACCEPTING = 2 ;

/* Properties */

public integer $fd ;

public integer $priority ;

public readonly EventBuffer $input ;

public readonly EventBuffer $output ;

/* Methods */

public void close ( void )

public bool connect ( string $addr )

public bool connectHost ( EventDnsBase $dns_base , string $hostname , int $port [, int $family = EventUtil::AF_UNSPEC ] )

public __construct ( EventBase $base [, mixed $socket = NULL [, int $options = 0 [, callable $readcb = NULL [, callable $writecb = NULL [, callable $eventcb = NULL ]]]]] )

public static array createPair ( EventBase $base [, int $options = 0 ] )

public bool disable ( int $events )

public bool enable ( int $events )

public void free ( void )

public string getDnsErrorString ( void )

public int getEnabled ( void )

public EventBuffer getInput ( void )

public EventBuffer getOutput ( void )

public string read ( int $size )

public bool readBuffer ( EventBuffer $buf )

public void setCallbacks ( callable $readcb , callable $writecb , callable $eventcb [, string $arg ] )

public bool setPriority ( int $priority )

public bool setTimeouts ( float $timeout_read , float $timeout_write )

public void setWatermark ( int $events , int $lowmark , int $highmark )

public string sslError ( void )

public static EventBufferEvent sslFilter ( EventBase $base , EventBufferEvent $underlying , EventSslContext $ctx , int $state [, int $options = 0 ] )

public string sslGetCipherInfo ( void )

public string sslGetCipherName ( void )

public string sslGetCipherVersion ( void )

public string sslGetProtocol ( void )

public void sslRenegotiate ( void )

public static EventBufferEvent sslSocket ( EventBase $base , mixed $socket , EventSslContext $ctx , int $state [, int $options ] )

public bool write ( string $data )

public bool writeBuffer ( EventBuffer $buf )

}

属性

fd

与缓冲区事件关联的数字文件描述符。通常表示一个绑定的套接字。等同于NULL,如果没有与缓冲区事件关联的文件描述符(套接字)。

优先

用于实现缓冲区事件的事件的优先级。

输入

底层输入缓冲区对象(EventBuffer)

产量

底层输出缓冲区对象(EventBuffer)

预定义的常量

EventBufferEvent::READING

在bufferevent的读取操作期间发生的事件。查看其他标志,了解它是哪个事件。

EventBufferEvent::WRITING

在bufferevent的写入操作期间发生的事件。查看其他标志,了解它是哪个事件。

EventBufferEvent::EOF

缓冲区事件得到文件结束指示。

EventBufferEvent::ERROR

在bufferevent操作期间发生错误。有关错误的更多信息,请调用EventUtil :: getLastSocketErrno()和/或EventUtil :: getLastSocketError()。

EventBufferEvent::TIMEOUTEventBufferEvent::CONNECTED

Finished a requested connection on the bufferevent.

EventBufferEvent::OPT_CLOSE_ON_FREE

当缓冲区事件被释放时,关闭底层传输。这将关闭底层套接字,释放底层缓冲区事件等。

EventBufferEvent::OPT_THREADSAFE

自动为bufferevent分配锁,以便在多个线程中使用它是安全的。

EventBufferEvent::OPT_DEFER_CALLBACKS

当这个标志被设置时,bufferevent延迟它的所有回调。请参阅»使用Libevent进行快速便携式无阻塞网络编程,延迟回调

EventBufferEvent::OPT_UNLOCK_CALLBACKS

默认情况下,当bufferevent设置为线程安全时,只要调用任何用户提供的回调,就会保持缓冲区事件的锁定。设置此选项使Libevent在调用回调时释放缓冲区事件的锁定。

EventBufferEvent::SSL_OPEN

SSL握手完成

EventBufferEvent::SSL_CONNECTING

SSL当前正在执行作为客户端的协商

EventBufferEvent::SSL_ACCEPTING

SSL当前正在作为服务器执行协商

目录

  • EventBufferEvent :: close - 关闭与当前缓冲区事件关联的文件描述符

  • EventBufferEvent :: connect - 将缓冲区事件的文件描述符连接到给定的地址或UNIX套接字

  • EventBufferEvent :: connectHost - 通过可选的异步DNS解析连接到主机名

  • EventBufferEvent :: __构造 - 构造EventBufferEvent对象

  • EventBufferEvent::createPair — Creates two buffer events connected to each other

  • EventBufferEvent::disable — Disable events read, write, or both on a buffer event.

  • EventBufferEvent::enable — Enable events read, write, or both on a buffer event.

  • EventBufferEvent::getDnsErrorString — Returns string describing the last failed DNS lookup attempt

  • EventBufferEvent::getEnabled — Returns bitmask of events currently enabled on the buffer event

  • EventBufferEvent::getInput — Returns underlying input buffer associated with current buffer event

  • EventBufferEvent::getOutput — Returns underlying output buffer associated with current buffer event

  • EventBufferEvent::readBuffer — Drains the entire contents of the input buffer and places them into buf

  • EventBufferEvent::setCallbacks — Assigns read, write and event(status) callbacks

  • EventBufferEvent::setPriority — Assign a priority to a bufferevent

  • EventBufferEvent::setTimeouts — Set the read and write timeout for a buffer event

  • EventBufferEvent::setWatermark — Adjusts read and/or write watermarks

  • EventBufferEvent::sslError — Returns most recent OpenSSL error reported on the buffer event

  • EventBufferEvent::sslFilter — Create a new SSL buffer event to send its data over another buffer event

  • EventBufferEvent::sslGetCipherInfo — Returns a textual description of the cipher.

  • EventBufferEvent::sslGetCipherName — Returns the current cipher name of the SSL connection.

  • EventBufferEvent::sslGetCipherVersion — Returns version of cipher used by current SSL connection.

  • EventBufferEvent::sslGetProtocol — Returns the name of the protocol used for current SSL connection.

  • EventBufferEvent::sslRenegotiate — Tells a bufferevent to begin SSL renegotiation.

  • EventBufferEvent::sslSocket — Creates a new SSL buffer event to send its data over an SSL on a socket

  • EventBufferEvent::write — Adds data to a buffer event's output buffer

  • EventBufferEvent::writeBuffer — Adds contents of the entire buffer to a buffer event's output buffer

← EventBuffer::write

EventBufferEvent::close →

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