532 lines
21 KiB
Java
532 lines
21 KiB
Java
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/*
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* Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.nio.channels;
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import java.io.IOException;
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import java.net.Socket;
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import java.net.SocketOption;
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import java.net.SocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.channels.spi.AbstractSelectableChannel;
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import java.nio.channels.spi.SelectorProvider;
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/**
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* A selectable channel for stream-oriented connecting sockets.
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*
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* <p> A socket channel is created by invoking one of the {@link #open open}
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* methods of this class. It is not possible to create a channel for an arbitrary,
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* pre-existing socket. A newly-created socket channel is open but not yet
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* connected. An attempt to invoke an I/O operation upon an unconnected
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* channel will cause a {@link NotYetConnectedException} to be thrown. A
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* socket channel can be connected by invoking its {@link #connect connect}
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* method; once connected, a socket channel remains connected until it is
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* closed. Whether or not a socket channel is connected may be determined by
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* invoking its {@link #isConnected isConnected} method.
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*
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* <p> Socket channels support <i>non-blocking connection:</i> A socket
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* channel may be created and the process of establishing the link to the
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* remote socket may be initiated via the {@link #connect connect} method for
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* later completion by the {@link #finishConnect finishConnect} method.
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* Whether or not a connection operation is in progress may be determined by
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* invoking the {@link #isConnectionPending isConnectionPending} method.
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*
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* <p> Socket channels support <i>asynchronous shutdown,</i> which is similar
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* to the asynchronous close operation specified in the {@link Channel} class.
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* If the input side of a socket is shut down by one thread while another
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* thread is blocked in a read operation on the socket's channel, then the read
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* operation in the blocked thread will complete without reading any bytes and
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* will return {@code -1}. If the output side of a socket is shut down by one
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* thread while another thread is blocked in a write operation on the socket's
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* channel, then the blocked thread will receive an {@link
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* AsynchronousCloseException}.
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*
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* <p> Socket options are configured using the {@link #setOption(SocketOption,Object)
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* setOption} method. Socket channels support the following options:
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* <blockquote>
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* <table class="striped">
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* <caption style="display:none">Socket options</caption>
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* <thead>
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* <tr>
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* <th scope="col">Option Name</th>
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* <th scope="col">Description</th>
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* </tr>
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* </thead>
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* <tbody>
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* <tr>
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* <th scope="row"> {@link java.net.StandardSocketOptions#SO_SNDBUF SO_SNDBUF} </th>
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* <td> The size of the socket send buffer </td>
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* </tr>
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* <tr>
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* <th scope="row"> {@link java.net.StandardSocketOptions#SO_RCVBUF SO_RCVBUF} </th>
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* <td> The size of the socket receive buffer </td>
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* </tr>
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* <tr>
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* <th scope="row"> {@link java.net.StandardSocketOptions#SO_KEEPALIVE SO_KEEPALIVE} </th>
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* <td> Keep connection alive </td>
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* </tr>
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* <tr>
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* <th scope="row"> {@link java.net.StandardSocketOptions#SO_REUSEADDR SO_REUSEADDR} </th>
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* <td> Re-use address </td>
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* </tr>
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* <tr>
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* <th scope="row"> {@link java.net.StandardSocketOptions#SO_LINGER SO_LINGER} </th>
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* <td> Linger on close if data is present (when configured in blocking mode
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* only) </td>
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* </tr>
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* <tr>
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* <th scope="row"> {@link java.net.StandardSocketOptions#TCP_NODELAY TCP_NODELAY} </th>
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* <td> Disable the Nagle algorithm </td>
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* </tr>
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* </tbody>
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* </table>
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* </blockquote>
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* Additional (implementation specific) options may also be supported.
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*
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* <p> Socket channels are safe for use by multiple concurrent threads. They
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* support concurrent reading and writing, though at most one thread may be
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* reading and at most one thread may be writing at any given time. The {@link
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* #connect connect} and {@link #finishConnect finishConnect} methods are
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* mutually synchronized against each other, and an attempt to initiate a read
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* or write operation while an invocation of one of these methods is in
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* progress will block until that invocation is complete. </p>
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*
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* @author Mark Reinhold
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* @author JSR-51 Expert Group
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* @since 1.4
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*/
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public abstract class SocketChannel
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extends AbstractSelectableChannel
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implements ByteChannel, ScatteringByteChannel, GatheringByteChannel, NetworkChannel
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{
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/**
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* Initializes a new instance of this class.
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*
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* @param provider
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* The provider that created this channel
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*/
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protected SocketChannel(SelectorProvider provider) {
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super(provider);
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}
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/**
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* Opens a socket channel.
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*
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* <p> The new channel is created by invoking the {@link
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* java.nio.channels.spi.SelectorProvider#openSocketChannel
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* openSocketChannel} method of the system-wide default {@link
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* java.nio.channels.spi.SelectorProvider} object. </p>
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*
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* @return A new socket channel
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*
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* @throws IOException
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* If an I/O error occurs
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*/
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public static SocketChannel open() throws IOException {
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return SelectorProvider.provider().openSocketChannel();
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}
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/**
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* Opens a socket channel and connects it to a remote address.
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*
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* <p> This convenience method works as if by invoking the {@link #open()}
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* method, invoking the {@link #connect(SocketAddress) connect} method upon
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* the resulting socket channel, passing it {@code remote}, and then
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* returning that channel. </p>
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*
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* @param remote
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* The remote address to which the new channel is to be connected
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*
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* @return A new, and connected, socket channel
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*
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* @throws AsynchronousCloseException
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* If another thread closes this channel
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* while the connect operation is in progress
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*
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* @throws ClosedByInterruptException
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* If another thread interrupts the current thread
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* while the connect operation is in progress, thereby
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* closing the channel and setting the current thread's
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* interrupt status
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*
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* @throws UnresolvedAddressException
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* If the given remote address is not fully resolved
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*
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* @throws UnsupportedAddressTypeException
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* If the type of the given remote address is not supported
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*
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* @throws SecurityException
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* If a security manager has been installed
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* and it does not permit access to the given remote endpoint
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*
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* @throws IOException
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* If some other I/O error occurs
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*/
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public static SocketChannel open(SocketAddress remote)
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throws IOException
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{
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SocketChannel sc = open();
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try {
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sc.connect(remote);
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} catch (Throwable x) {
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try {
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sc.close();
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} catch (Throwable suppressed) {
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x.addSuppressed(suppressed);
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}
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throw x;
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}
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assert sc.isConnected();
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return sc;
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}
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/**
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* Returns an operation set identifying this channel's supported
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* operations.
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*
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* <p> Socket channels support connecting, reading, and writing, so this
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* method returns {@code (}{@link SelectionKey#OP_CONNECT}
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* {@code |} {@link SelectionKey#OP_READ} {@code |} {@link
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* SelectionKey#OP_WRITE}{@code )}.
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*
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* @return The valid-operation set
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*/
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public final int validOps() {
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return (SelectionKey.OP_READ
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| SelectionKey.OP_WRITE
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| SelectionKey.OP_CONNECT);
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}
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// -- Socket-specific operations --
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/**
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* @throws ConnectionPendingException
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* If a non-blocking connect operation is already in progress on
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* this channel
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* @throws AlreadyBoundException {@inheritDoc}
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* @throws UnsupportedAddressTypeException {@inheritDoc}
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* @throws ClosedChannelException {@inheritDoc}
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* @throws IOException {@inheritDoc}
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* @throws SecurityException
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* If a security manager has been installed and its
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* {@link SecurityManager#checkListen checkListen} method denies
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* the operation
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*
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* @since 1.7
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*/
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@Override
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public abstract SocketChannel bind(SocketAddress local)
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throws IOException;
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/**
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* @throws UnsupportedOperationException {@inheritDoc}
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* @throws IllegalArgumentException {@inheritDoc}
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* @throws ClosedChannelException {@inheritDoc}
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* @throws IOException {@inheritDoc}
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*
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* @since 1.7
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*/
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@Override
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public abstract <T> SocketChannel setOption(SocketOption<T> name, T value)
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throws IOException;
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/**
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* Shutdown the connection for reading without closing the channel.
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*
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* <p> Once shutdown for reading then further reads on the channel will
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* return {@code -1}, the end-of-stream indication. If the input side of the
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* connection is already shutdown then invoking this method has no effect.
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*
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* @return The channel
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*
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* @throws NotYetConnectedException
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* If this channel is not yet connected
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* @throws ClosedChannelException
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* If this channel is closed
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* @throws IOException
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* If some other I/O error occurs
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*
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* @since 1.7
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*/
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public abstract SocketChannel shutdownInput() throws IOException;
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/**
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* Shutdown the connection for writing without closing the channel.
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*
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* <p> Once shutdown for writing then further attempts to write to the
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* channel will throw {@link ClosedChannelException}. If the output side of
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* the connection is already shutdown then invoking this method has no
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* effect.
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*
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* @return The channel
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*
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* @throws NotYetConnectedException
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* If this channel is not yet connected
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* @throws ClosedChannelException
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* If this channel is closed
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* @throws IOException
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* If some other I/O error occurs
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*
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* @since 1.7
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*/
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public abstract SocketChannel shutdownOutput() throws IOException;
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/**
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* Retrieves a socket associated with this channel.
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*
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* <p> The returned object will not declare any public methods that are not
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* declared in the {@link java.net.Socket} class. </p>
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*
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* @return A socket associated with this channel
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*/
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public abstract Socket socket();
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/**
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* Tells whether or not this channel's network socket is connected.
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*
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* @return {@code true} if, and only if, this channel's network socket
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* is {@link #isOpen open} and connected
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*/
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public abstract boolean isConnected();
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/**
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* Tells whether or not a connection operation is in progress on this
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* channel.
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*
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* @return {@code true} if, and only if, a connection operation has been
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* initiated on this channel but not yet completed by invoking the
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* {@link #finishConnect finishConnect} method
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*/
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public abstract boolean isConnectionPending();
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/**
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* Connects this channel's socket.
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*
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* <p> If this channel is in non-blocking mode then an invocation of this
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* method initiates a non-blocking connection operation. If the connection
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* is established immediately, as can happen with a local connection, then
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* this method returns {@code true}. Otherwise this method returns
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* {@code false} and the connection operation must later be completed by
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* invoking the {@link #finishConnect finishConnect} method.
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*
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* <p> If this channel is in blocking mode then an invocation of this
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* method will block until the connection is established or an I/O error
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* occurs.
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*
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* <p> This method performs exactly the same security checks as the {@link
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* java.net.Socket} class. That is, if a security manager has been
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* installed then this method verifies that its {@link
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* java.lang.SecurityManager#checkConnect checkConnect} method permits
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* connecting to the address and port number of the given remote endpoint.
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*
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* <p> This method may be invoked at any time. If a read or write
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* operation upon this channel is invoked while an invocation of this
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* method is in progress then that operation will first block until this
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* invocation is complete. If a connection attempt is initiated but fails,
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* that is, if an invocation of this method throws a checked exception,
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* then the channel will be closed. </p>
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*
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* @param remote
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* The remote address to which this channel is to be connected
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*
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* @return {@code true} if a connection was established,
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* {@code false} if this channel is in non-blocking mode
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* and the connection operation is in progress
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*
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* @throws AlreadyConnectedException
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* If this channel is already connected
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*
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* @throws ConnectionPendingException
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* If a non-blocking connection operation is already in progress
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* on this channel
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws AsynchronousCloseException
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* If another thread closes this channel
|
||
|
|
* while the connect operation is in progress
|
||
|
|
*
|
||
|
|
* @throws ClosedByInterruptException
|
||
|
|
* If another thread interrupts the current thread
|
||
|
|
* while the connect operation is in progress, thereby
|
||
|
|
* closing the channel and setting the current thread's
|
||
|
|
* interrupt status
|
||
|
|
*
|
||
|
|
* @throws UnresolvedAddressException
|
||
|
|
* If the given remote address is not fully resolved
|
||
|
|
*
|
||
|
|
* @throws UnsupportedAddressTypeException
|
||
|
|
* If the type of the given remote address is not supported
|
||
|
|
*
|
||
|
|
* @throws SecurityException
|
||
|
|
* If a security manager has been installed
|
||
|
|
* and it does not permit access to the given remote endpoint
|
||
|
|
*
|
||
|
|
* @throws IOException
|
||
|
|
* If some other I/O error occurs
|
||
|
|
*/
|
||
|
|
public abstract boolean connect(SocketAddress remote) throws IOException;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Finishes the process of connecting a socket channel.
|
||
|
|
*
|
||
|
|
* <p> A non-blocking connection operation is initiated by placing a socket
|
||
|
|
* channel in non-blocking mode and then invoking its {@link #connect
|
||
|
|
* connect} method. Once the connection is established, or the attempt has
|
||
|
|
* failed, the socket channel will become connectable and this method may
|
||
|
|
* be invoked to complete the connection sequence. If the connection
|
||
|
|
* operation failed then invoking this method will cause an appropriate
|
||
|
|
* {@link java.io.IOException} to be thrown.
|
||
|
|
*
|
||
|
|
* <p> If this channel is already connected then this method will not block
|
||
|
|
* and will immediately return {@code true}. If this channel is in
|
||
|
|
* non-blocking mode then this method will return {@code false} if the
|
||
|
|
* connection process is not yet complete. If this channel is in blocking
|
||
|
|
* mode then this method will block until the connection either completes
|
||
|
|
* or fails, and will always either return {@code true} or throw a checked
|
||
|
|
* exception describing the failure.
|
||
|
|
*
|
||
|
|
* <p> This method may be invoked at any time. If a read or write
|
||
|
|
* operation upon this channel is invoked while an invocation of this
|
||
|
|
* method is in progress then that operation will first block until this
|
||
|
|
* invocation is complete. If a connection attempt fails, that is, if an
|
||
|
|
* invocation of this method throws a checked exception, then the channel
|
||
|
|
* will be closed. </p>
|
||
|
|
*
|
||
|
|
* @return {@code true} if, and only if, this channel's socket is now
|
||
|
|
* connected
|
||
|
|
*
|
||
|
|
* @throws NoConnectionPendingException
|
||
|
|
* If this channel is not connected and a connection operation
|
||
|
|
* has not been initiated
|
||
|
|
*
|
||
|
|
* @throws ClosedChannelException
|
||
|
|
* If this channel is closed
|
||
|
|
*
|
||
|
|
* @throws AsynchronousCloseException
|
||
|
|
* If another thread closes this channel
|
||
|
|
* while the connect operation is in progress
|
||
|
|
*
|
||
|
|
* @throws ClosedByInterruptException
|
||
|
|
* If another thread interrupts the current thread
|
||
|
|
* while the connect operation is in progress, thereby
|
||
|
|
* closing the channel and setting the current thread's
|
||
|
|
* interrupt status
|
||
|
|
*
|
||
|
|
* @throws IOException
|
||
|
|
* If some other I/O error occurs
|
||
|
|
*/
|
||
|
|
public abstract boolean finishConnect() throws IOException;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the remote address to which this channel's socket is connected.
|
||
|
|
*
|
||
|
|
* <p> Where the channel is bound and connected to an Internet Protocol
|
||
|
|
* socket address then the return value from this method is of type {@link
|
||
|
|
* java.net.InetSocketAddress}.
|
||
|
|
*
|
||
|
|
* @return The remote address; {@code null} if the channel's socket is not
|
||
|
|
* connected
|
||
|
|
*
|
||
|
|
* @throws ClosedChannelException
|
||
|
|
* If the channel is closed
|
||
|
|
* @throws IOException
|
||
|
|
* If an I/O error occurs
|
||
|
|
*
|
||
|
|
* @since 1.7
|
||
|
|
*/
|
||
|
|
public abstract SocketAddress getRemoteAddress() throws IOException;
|
||
|
|
|
||
|
|
// -- ByteChannel operations --
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @throws NotYetConnectedException
|
||
|
|
* If this channel is not yet connected
|
||
|
|
*/
|
||
|
|
public abstract int read(ByteBuffer dst) throws IOException;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @throws NotYetConnectedException
|
||
|
|
* If this channel is not yet connected
|
||
|
|
*/
|
||
|
|
public abstract long read(ByteBuffer[] dsts, int offset, int length)
|
||
|
|
throws IOException;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @throws NotYetConnectedException
|
||
|
|
* If this channel is not yet connected
|
||
|
|
*/
|
||
|
|
public final long read(ByteBuffer[] dsts) throws IOException {
|
||
|
|
return read(dsts, 0, dsts.length);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @throws NotYetConnectedException
|
||
|
|
* If this channel is not yet connected
|
||
|
|
*/
|
||
|
|
public abstract int write(ByteBuffer src) throws IOException;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @throws NotYetConnectedException
|
||
|
|
* If this channel is not yet connected
|
||
|
|
*/
|
||
|
|
public abstract long write(ByteBuffer[] srcs, int offset, int length)
|
||
|
|
throws IOException;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @throws NotYetConnectedException
|
||
|
|
* If this channel is not yet connected
|
||
|
|
*/
|
||
|
|
public final long write(ByteBuffer[] srcs) throws IOException {
|
||
|
|
return write(srcs, 0, srcs.length);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
* <p>
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* @return The {@code SocketAddress} that the socket is bound to, or the
|
||
|
|
* {@code SocketAddress} representing the loopback address 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;
|
||
|
|
|
||
|
|
}
|