Channel接口定义:[url]http://donald-draper.iteye.com/blog/2369111[/url]
AbstractInterruptibleChannel接口定义:[url]http://donald-draper.iteye.com/blog/2369238[/url]
SelectableChannel接口定义:[url]http://donald-draper.iteye.com/blog/2369317[/url]
SelectionKey定义:[url]http://donald-draper.iteye.com/blog/2369499[/url]
SelectorProvider定义:[url]http://donald-draper.iteye.com/blog/2369615[/url]
AbstractSelectableChannel定义:[url]http://donald-draper.iteye.com/blog/2369742[/url]
先来回顾一下ServerSocketChannel继承结构树:
到目前这篇文章之前我们,看完了socket的通道的一个可选择通道分支,在这个过程成,我们
看了一下选择key,通道选择器提供者的定义,今天我们来看另一个分支网络通道:
从网络通道NetworkChannel的定义来看,主要作用是绑定socket的local地址,获取绑定的地址,
以及设置或获取socket选项。
//SocketOption
AbstractInterruptibleChannel接口定义:[url]http://donald-draper.iteye.com/blog/2369238[/url]
SelectableChannel接口定义:[url]http://donald-draper.iteye.com/blog/2369317[/url]
SelectionKey定义:[url]http://donald-draper.iteye.com/blog/2369499[/url]
SelectorProvider定义:[url]http://donald-draper.iteye.com/blog/2369615[/url]
AbstractSelectableChannel定义:[url]http://donald-draper.iteye.com/blog/2369742[/url]
先来回顾一下ServerSocketChannel继承结构树:
//ServerSocketChannel
public abstract class ServerSocketChannel
extends AbstractSelectableChannel
implements NetworkChannel
//AbstractSelectableChannel
public abstract class AbstractSelectableChannel
extends SelectableChannel
//SelectableChannel
public abstract class SelectableChannel
extends AbstractInterruptibleChannel
implements Channel
到目前这篇文章之前我们,看完了socket的通道的一个可选择通道分支,在这个过程成,我们
看了一下选择key,通道选择器提供者的定义,今天我们来看另一个分支网络通道:
package java.nio.channels;
import java.net.SocketOption;
import java.net.SocketAddress;
import java.util.Set;
import java.io.IOException;
/**
* A channel to a network socket.
*
* <p> A channel that implements this interface is a channel to a network
* socket. The {@link #bind(SocketAddress) bind} method is used to bind the
* socket to a local {@link SocketAddress address}, the {@link #getLocalAddress()
* getLocalAddress} method returns the address that the socket is bound to, and
* the {@link #setOption(SocketOption,Object) setOption} and {@link
* #getOption(SocketOption) getOption} methods are used to set and query socket
* options. An implementation of this interface should specify the socket options
* that it supports.
*NetworkChannel是一个通道到网络socket的实现,#bind用于绑定一个本地socket地址,
#getLocalAddress可以返回绑定的地址,#setOption和#getOption用于设置和获取网络通道
的选项配置。接口的实现应该精确支持的选项配置集。
* <p> The {@link #bind bind} and {@link #setOption setOption} methods that do
* not otherwise have a value to return are specified to return the network
* channel upon which they are invoked. This allows method invocations to be
* chained. Implementations of this interface should specialize the return type
* so that method invocations on the implementation class can be chained.
* #bind和#setOption在调用时,不一定非要返回网络通道,允许被链式调用。网络通道的
具体实现应该明确#bind和#setOption的返回类型,以便可以链式调用。
* @since 1.7
*/
public interface NetworkChannel
extends Channel
{
/**
* Binds the channel's socket to a local address.
*绑定通道socket到本地地址
* <p> This method is used to establish an association between the socket and
* a local address. Once an association is established then the socket remains
* bound until the channel is closed. If the {@code local} parameter has the
* value {@code null} then the socket will be bound to an address that is
* assigned automatically.
*bind的方法用于建立socket和本地地址的关系。只要关系建立,在通道没关闭之前socket
仍绑定着本地SocketAddress。如果socket地址参数为null,默认socket将绑定自动分配的地址
* @param local
* The address to bind the socket, or {@code null} to bind the socket
* to an automatically assigned socket address
*
* @return This channel
*
* @throws AlreadyBoundException 已绑定
* If the socket is already bound
* @throws UnsupportedAddressTypeException 不支持地址类型
* If the type of the given address is not supported
* @throws ClosedChannelException 通道关闭
* If the channel is closed
* @throws IOException 操作异常
* If some other I/O error occurs
* @throws SecurityException 权限访问异常
* If a security manager is installed and it denies an unspecified
* permission. An implementation of this interface should specify
* any required permissions.
*
* @see #getLocalAddress
*/
NetworkChannel bind(SocketAddress local) throws IOException;
/**
* Returns the socket address that this channel's socket is bound to, or
* {@code null} if the socket is not bound.
*返回socket通道绑定的socket地址,如果为null,即没有绑定。
* <p> Where the channel is {@link #bind bound} to an Internet Protocol
* socket address then the return value from this method is of type {@link
* java.net.InetSocketAddress}.
*如果通道绑定到一个网络协议socket地址,将会返回一个InetSocketAddress的地址
* @return The socket address that the socket is bound to, or {@code null}
* if the channel's socket is not bound
*
* @throws ClosedChannelException 通道已关闭
* If the channel is closed
* @throws IOException IO操作异常
* If an I/O error occurs
*/
SocketAddress getLocalAddress() throws IOException;
/**
* Sets the value of a socket option.
* 设置socket选项值
* @param name
* The socket option
* @param value,值为null,对某些socket选项也许是一个有效的值
* The value of the socket option. A value of {@code null} may be
* a valid value for some socket options.
*
* @return This channel
*
* @throws UnsupportedOperationException ,如果socket选项不被通道支持
* If the socket option is not supported by this channel
* @throws IllegalArgumentException 如果值对socket选项是一个无效的值
* If the value is not a valid value for this socket option
* @throws ClosedChannelException 通道关闭
* If this channel is closed
* @throws IOException 通道IO异常
* If an I/O error occurs
*
* @see java.net.StandardSocketOptions
*/
<T> NetworkChannel setOption(SocketOption<T> name, T value) throws IOException;
/**
* Returns the value of a socket option.
* 获取socket选项的值
* @param name
* The socket option
*
* @return The value of the socket option. A value of {@code null} may be
* a valid value for some socket options.
*
* @throws UnsupportedOperationException
* If the socket option is not supported by this channel
* @throws ClosedChannelException
* If this channel is closed
* @throws IOException
* If an I/O error occurs
*
* @see java.net.StandardSocketOptions
*/
<T> T getOption(SocketOption<T> name) throws IOException;
/**
* Returns a set of the socket options supported by this channel.
*返回通道支持的socket选项
* <p> This method will continue to return the set of options even after the
* channel has been closed.
*即使在通道关闭时,此方法仍返回socket配置选项集
* @return A set of the socket options supported by this channel
*/
Set<SocketOption<?>> supportedOptions();
}
从网络通道NetworkChannel的定义来看,主要作用是绑定socket的local地址,获取绑定的地址,
以及设置或获取socket选项。
//SocketOption
package java.net;
/**
* A socket option associated with a socket.
* SocketOption为与socket关联的选项配置
* <p> In the {@link java.nio.channels channels} package, the {@link
* java.nio.channels.NetworkChannel} interface defines the {@link
* java.nio.channels.NetworkChannel#setOption(SocketOption,Object) setOption}
* and {@link java.nio.channels.NetworkChannel#getOption(SocketOption) getOption}
* methods to set and query the channel's socket options.
*在网络通道NetworkChannel中定义了设置和获取socket选择配置的方法。
* @param <T> The type of the socket option value.
*
* @since 1.7
*
* @see StandardSocketOptions
*/
public interface SocketOption<T> {
/**
* Returns the name of the socket option.
选型名称
*/
String name();
/**
* Returns the type of the socket option value.
选项类型
*/
Class<T> type();
}