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    Necko Interfaces Overview

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    Warning: The content of this article may be out of date. It was last updated in 2001.


    • central necko service
    • manages protocol handlers
    • thin layer over protocol handlers
    • provides interface for creating URI objects from URI strings
    • maps URI scheme to appropriate nsIProtocolHandler impl

    nsIURI (nsIURL, nsIFileURL, nsIStandardURL)

    • represents an URI, with getters and setters for various URI parts (eg. scheme, host, path, ...)
    • per protocol implementation
    • necko provides URI impl's for common URI formats (see nsStandardURL, nsSimpleURI)

    nsIChannel : nsIRequest

    • represents a logical connection to the resource identified by a nsIURI
    • per protocol implementation
    • single use (ie. channel is used to download the resource once)
    • download initiated via nsIChannel::AsyncOpen method
    • can be canceled via nsIRequest::Cancel method at anytime after invocation of AsyncOpen method


    • a service that manages a protocol, identified by it's URI scheme (eg. http)
    • maps URI string to nsIURI instance via NewURI method
    • creates nsIChannel instance from nsIURI instance via NewChannel method

    nsIStreamListener : nsIRequestObserver

    • implemented by the consumer of a nsIChannel instance
    • passed to nsIChannel::AsyncOpen method
    • nsIRequestObserver::OnStartRequest - notifies start of async download
    • nsIStreamListener::OnDataAvailable - notifies presence of downloaded data
    • nsIRequestObserver::OnStopRequest - notifies completion of async download, possibly w/ error

    nsILoadGroup : nsIRequest

    • attribute of a nsIRequest
    • channel impl adds itself to its load group during invocation of AsyncOpen
    • channel impl removes itself from its load group when download completes
    • load groups in gecko own all channels used to load a particular page (until the channels complete)
    • all channels owned by a load group can be canceled at once via the load group's nsIRequest::Cancel method


    • represents a physical connection, such as a file descriptor or a socket
    • used directly by protocol handler implementations (as well as by mailnews and chatzilla)
    • synchronous I/O methods: OpenInputStream, OpenOutputStream
    • asynchronous I/O methods: AsyncRead, AsyncWrite
    • nsITransport::AsyncRead takes a nsIStreamListener parameter

    Original Document Information

    • Author(s): Darin Fisher
    • Last Updated Date: December 10, 2001
    • Copyright Information: Portions of this content are © 1998–2007 by individual contributors; content available under a Creative Commons license | Details.


    Contributors to this page: kohei.yoshino
    最終更新者: kohei.yoshino,