JDK 17 java.base.jmod - Base Module
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⏎ java/nio/channels/ServerSocketChannel.java
/*
* Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.nio.channels;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.NetPermission;
import java.net.ProtocolFamily;
import java.net.ServerSocket;
import java.net.SocketOption;
import java.net.SocketAddress;
import java.net.UnixDomainSocketAddress;
import java.nio.channels.spi.AbstractSelectableChannel;
import java.nio.channels.spi.SelectorProvider;
import static java.util.Objects.requireNonNull;
/**
* A selectable channel for stream-oriented listening sockets.
*
* <p> A server-socket channel is created by invoking one of the {@code open}
* methods of this class. The no-arg {@link #open() open} method opens a server-socket
* channel for an <i>Internet protocol</i> socket. The {@link #open(ProtocolFamily)}
* method is used to open a server-socket channel for a socket of a specified
* protocol family. It is not possible to create a channel for an arbitrary,
* pre-existing socket. A newly-created server-socket channel is open but not yet
* bound. An attempt to invoke the {@link #accept() accept} method of an
* unbound server-socket channel will cause a {@link NotYetBoundException}
* to be thrown. A server-socket channel can be bound by invoking one of the
* {@link #bind(java.net.SocketAddress, int) bind} methods defined by this class.
*
* <p> Socket options are configured using the {@link #setOption(SocketOption,Object)
* setOption} method. Server-socket channels for <i>Internet protocol</i> sockets
* support the following options:
* <blockquote>
* <table class="striped">
* <caption style="display:none">Socket options</caption>
* <thead>
* <tr>
* <th scope="col">Option Name</th>
* <th scope="col">Description</th>
* </tr>
* </thead>
* <tbody>
* <tr>
* <th scope="row"> {@link java.net.StandardSocketOptions#SO_RCVBUF SO_RCVBUF} </th>
* <td> The size of the socket receive buffer </td>
* </tr>
* <tr>
* <th scope="row"> {@link java.net.StandardSocketOptions#SO_REUSEADDR SO_REUSEADDR} </th>
* <td> Re-use address </td>
* </tr>
* </tbody>
* </table>
* </blockquote>
*
* <p> Server-socket channels for <i>Unix domain</i> sockets support:
* <blockquote>
* <table class="striped">
* <caption style="display:none">Socket options</caption>
* <thead>
* <tr>
* <th scope="col">Option Name</th>
* <th scope="col">Description</th>
* </tr>
* </thead>
* <tbody>
* <tr>
* <th scope="row"> {@link java.net.StandardSocketOptions#SO_RCVBUF SO_RCVBUF} </th>
* <td> The size of the socket receive buffer </td>
* </tr>
* </tbody>
* </table>
* </blockquote>
*
* <p> Additional (implementation specific) options may also be supported.
*
* <p> Server-socket channels are safe for use by multiple concurrent threads.
* </p>
*
* @author Mark Reinhold
* @author JSR-51 Expert Group
* @since 1.4
*/
public abstract class ServerSocketChannel
extends AbstractSelectableChannel
implements NetworkChannel
{
/**
* Initializes a new instance of this class.
*
* @param provider
* The provider that created this channel
*/
protected ServerSocketChannel(SelectorProvider provider) {
super(provider);
}
/**
* Opens a server-socket channel for an <i>Internet protocol</i> socket.
*
* <p> The new channel is created by invoking the {@link
* java.nio.channels.spi.SelectorProvider#openServerSocketChannel
* openServerSocketChannel} method of the system-wide default {@link
* java.nio.channels.spi.SelectorProvider} object.
*
* <p> The new channel's socket is initially unbound; it must be bound to a
* specific address via one of its socket's {@link
* java.net.ServerSocket#bind(SocketAddress) bind} methods before
* connections can be accepted. </p>
*
* @return A new socket channel
*
* @throws IOException
* If an I/O error occurs
*
* @see <a href="../../net/doc-files/net-properties.html#Ipv4IPv6">
* java.net.preferIPv4Stack</a> system property
*/
public static ServerSocketChannel open() throws IOException {
return SelectorProvider.provider().openServerSocketChannel();
}
/**
* Opens a server-socket channel. The {@code family} parameter specifies the
* {@link ProtocolFamily protocol family} of the channel's socket.
*
* <p> The new channel is created by invoking the {@link
* java.nio.channels.spi.SelectorProvider#openServerSocketChannel(ProtocolFamily)
* openServerSocketChannel(ProtocolFamily)} method of the system-wide default {@link
* java.nio.channels.spi.SelectorProvider} object. </p>
*
* @param family
* The protocol family
*
* @return A new socket channel
*
* @throws UnsupportedOperationException
* If the specified protocol family is not supported. For example,
* suppose the parameter is specified as {@link
* java.net.StandardProtocolFamily#INET6 StandardProtocolFamily.INET6}
* but IPv6 is not enabled on the platform.
* @throws IOException
* If an I/O error occurs
*
* @see <a href="../../net/doc-files/net-properties.html#Ipv4IPv6">
* java.net.preferIPv4Stack</a> system property
*
* @since 15
*/
public static ServerSocketChannel open(ProtocolFamily family) throws IOException {
return SelectorProvider.provider().openServerSocketChannel(requireNonNull(family));
}
/**
* Returns an operation set identifying this channel's supported
* operations.
*
* <p> Server-socket channels only support the accepting of new
* connections, so this method returns {@link SelectionKey#OP_ACCEPT}.
* </p>
*
* @return The valid-operation set
*/
public final int validOps() {
return SelectionKey.OP_ACCEPT;
}
// -- ServerSocket-specific operations --
/**
* Binds the channel's socket to a local address and configures the socket
* to listen for connections.
*
* <p> An invocation of this method is equivalent to the following:
* <blockquote><pre>
* bind(local, 0);
* </pre></blockquote>
*
* @param local
* The local address to bind the socket, or {@code null} to bind
* to an automatically assigned socket address
*
* @return This channel
*
* @throws AlreadyBoundException {@inheritDoc}
* @throws UnsupportedAddressTypeException {@inheritDoc}
* @throws ClosedChannelException {@inheritDoc}
* @throws IOException {@inheritDoc}
* @throws SecurityException
* If a security manager has been installed and it denies the
* operation
*
* @since 1.7
*/
public final ServerSocketChannel bind(SocketAddress local)
throws IOException
{
return bind(local, 0);
}
/**
* Binds the channel's socket to a local address and configures the socket to
* listen for connections.
*
* <p> This method is used to establish an association between the socket and
* a local address. For <i>Internet protocol</i> sockets, once an association
* is established then the socket remains bound until the channel is closed.
*
* <p> The {@code backlog} parameter is the maximum number of pending
* connections on the socket. Its exact semantics are implementation specific.
* In particular, an implementation may impose a maximum length or may choose
* to ignore the parameter altogether. If the {@code backlog} parameter has
* the value {@code 0}, or a negative value, then an implementation specific
* default is used.
*
* @apiNote
* Binding a server socket channel for a <i>Unix Domain</i> socket, creates a
* file corresponding to the file path in the {@link UnixDomainSocketAddress}.
* This file persists after the channel is closed, and must be removed before
* another socket can bind to the same name. Binding to a {@code null} address
* causes the socket to be <i>automatically</i> bound to some unique file
* in a system temporary location. The associated socket file also persists
* after the channel is closed. Its name can be obtained from the channel's
* local socket address.
*
* @implNote
* Each platform enforces an implementation specific, maximum length for the
* name of a <i>Unix Domain</i> socket. This limitation is enforced when a
* channel is bound. The maximum length is typically close to and generally
* not less than 100 bytes. This limitation also applies to <i>automatically</i>
* bound server socket channels. See the <i>Unix domain</i>
* <a href="../../net/doc-files/net-properties.html#Unixdomain">networking
* properties</a> that can be used to select the temporary directory where
* these sockets are created.
*
* @param local
* The address to bind the socket, or {@code null} to bind to
* an automatically assigned socket address
* @param backlog
* The maximum number of pending connections
*
* @return This channel
*
* @throws AlreadyBoundException
* If the socket is already bound
* @throws UnsupportedAddressTypeException
* If the type of the given address is not supported
* @throws ClosedChannelException
* If this channel is closed
* @throws IOException
* If some other I/O error occurs
* @throws SecurityException
* If a security manager has been installed and its {@link
* SecurityManager#checkListen checkListen} method denies
* the operation for an <i>Internet protocol</i> socket address,
* or for a <i>Unix domain</i> socket address if it denies
* {@link NetPermission}{@code("accessUnixDomainSocket")}.
*
* @since 1.7
*/
public abstract ServerSocketChannel bind(SocketAddress local, int backlog)
throws IOException;
/**
* @throws UnsupportedOperationException {@inheritDoc}
* @throws IllegalArgumentException {@inheritDoc}
* @throws ClosedChannelException {@inheritDoc}
* @throws IOException {@inheritDoc}
*
* @since 1.7
*/
public abstract <T> ServerSocketChannel setOption(SocketOption<T> name, T value)
throws IOException;
/**
* Retrieves a server socket associated with this channel.
*
* <p> The returned object will not declare any public methods that are not
* declared in the {@link java.net.ServerSocket} class. </p>
*
* @return A server socket associated with this channel
*
* @throws UnsupportedOperationException
* If the channel's socket is not an <i>Internet protocol</i> socket
*/
public abstract ServerSocket socket();
/**
* Accepts a connection made to this channel's socket.
*
* <p> If this channel is in non-blocking mode then this method will
* immediately return {@code null} if there are no pending connections.
* Otherwise it will block indefinitely until a new connection is available
* or an I/O error occurs.
*
* <p> The socket channel returned by this method, if any, will be in
* blocking mode regardless of the blocking mode of this channel.
*
* <p> If bound to an <i>Internet protocol</i> socket address, this method
* performs exactly the same security checks as the {@link
* java.net.ServerSocket#accept accept} method of the {@link java.net.ServerSocket}
* class. That is, if a security manager has been installed then for each
* new connection this method verifies that the address and port number
* of the connection's remote endpoint are permitted by the security
* manager's {@link java.lang.SecurityManager#checkAccept checkAccept}
* method. If bound to a <i>Unix Domain</i> socket address, this method checks
* {@link NetPermission}{@code ("accessUnixDomainSocket")}.
*
* @return The socket channel for the new connection,
* or {@code null} if this channel is in non-blocking mode
* and no connection is available to be accepted
*
* @throws ClosedChannelException
* If this channel is closed
*
* @throws AsynchronousCloseException
* If another thread closes this channel
* while the accept operation is in progress
*
* @throws ClosedByInterruptException
* If another thread interrupts the current thread
* while the accept operation is in progress, thereby
* closing the channel and setting the current thread's
* interrupt status
*
* @throws NotYetBoundException
* If this channel's socket has not yet been bound
*
* @throws SecurityException
* If a security manager has been installed and this
* channel is bound to an {@link InetSocketAddress}
* and the security manager denies access to the remote endpoint
* of the new connection, or if this channel is bound to a
* {@link UnixDomainSocketAddress} and the security manager
* denies {@link NetPermission}{@code ("accessUnixDomainSocket")}
*
* @throws IOException
* If some other I/O error occurs
*/
public abstract SocketChannel accept() throws IOException;
/**
* {@inheritDoc}
*
* If there is a security manager set, its {@code checkConnect} method is
* called with the local address and {@code -1} as its arguments to see
* if the operation is allowed. If the operation is not allowed,
* a {@code SocketAddress} representing the
* {@link java.net.InetAddress#getLoopbackAddress loopback} address and the
* local port of the channel's socket is returned.
*
* <p> Where the channel is bound to a <i>Unix Domain</i> socket address, the socket
* address is a {@link UnixDomainSocketAddress}. If there is a security manager
* set, its {@link SecurityManager#checkPermission(java.security.Permission)
* checkPermission} method is called with {@link NetPermission}{@code
* ("accessUnixDomainSocket")}. If the operation is not allowed an unnamed
* {@link UnixDomainSocketAddress} is returned.
*
* @return The {@code SocketAddress} that the socket is bound to, or the
* {@code SocketAddress} representing the loopback address or empty
* path if denied by the security manager, or {@code null} if the
* channel's socket is not bound
*
* @throws ClosedChannelException {@inheritDoc}
* @throws IOException {@inheritDoc}
*/
@Override
public abstract SocketAddress getLocalAddress() throws IOException;
}
⏎ java/nio/channels/ServerSocketChannel.java
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