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8245194: Unix domain socket channel implementation
Reviewed-by: erikj, dfuchs, alanb, chegar
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,211 @@ | ||
| /* | ||
| * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. | ||
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| * | ||
| * This code is free software; you can redistribute it and/or modify it | ||
| * under the terms of the GNU General Public License version 2 only, as | ||
| * published by the Free Software Foundation. Oracle designates this | ||
| * particular file as subject to the "Classpath" exception as provided | ||
| * by Oracle in the LICENSE file that accompanied this code. | ||
| * | ||
| * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| * version 2 for more details (a copy is included in the LICENSE file that | ||
| * accompanied this code). | ||
| * | ||
| * You should have received a copy of the GNU General Public License version | ||
| * 2 along with this work; if not, write to the Free Software Foundation, | ||
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| * | ||
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| * or visit www.oracle.com if you need additional information or have any | ||
| * questions. | ||
| */ | ||
|
|
||
| package java.net; | ||
|
|
||
| import java.io.ObjectStreamException; | ||
| import java.io.Serializable; | ||
| import java.net.SocketAddress; | ||
| import java.nio.channels.SocketChannel; | ||
| import java.nio.file.FileSystem; | ||
| import java.nio.file.FileSystems; | ||
| import java.nio.file.InvalidPathException; | ||
| import java.nio.file.Path; | ||
|
|
||
| /** | ||
| * A <a href="package-summary.html#unixdomain">Unix domain</a> socket address. | ||
| * A Unix domain socket address encapsulates a file-system path that Unix domain sockets | ||
| * bind or connect to. | ||
| * | ||
| * <p> An <a id="unnamed"></a><i>unnamed</i> {@code UnixDomainSocketAddress} has | ||
| * an empty path. The local address of a {@link SocketChannel} to a Unix domain socket | ||
| * that is <i>automatically</i> or <i>implicitly</i> bound will be unnamed. | ||
| * | ||
| * <p> {@link Path} objects used to create instances of this class must be obtained | ||
| * from the {@linkplain FileSystems#getDefault system-default} file system. | ||
| * | ||
| * @see java.nio.channels.SocketChannel | ||
| * @see java.nio.channels.ServerSocketChannel | ||
| * @since 16 | ||
| */ | ||
| public final class UnixDomainSocketAddress extends SocketAddress { | ||
| @java.io.Serial | ||
| static final long serialVersionUID = 92902496589351288L; | ||
|
|
||
| private final transient Path path; | ||
|
|
||
| /** | ||
| * A serial proxy for all {@link UnixDomainSocketAddress} instances. | ||
| * It captures the file path name and reconstructs using the public static | ||
| * {@link #of(String) factory}. | ||
| * | ||
| * @serial include | ||
| */ | ||
| private static final class Ser implements Serializable { | ||
| @java.io.Serial | ||
| static final long serialVersionUID = -7955684448513979814L; | ||
|
|
||
| /** | ||
| * The path name. | ||
| * @serial | ||
| */ | ||
| private final String pathname; | ||
|
|
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| Ser(String pathname) { | ||
| this.pathname = pathname; | ||
| } | ||
|
|
||
| /** | ||
| * Creates a {@link UnixDomainSocketAddress} instance, by an invocation | ||
| * of the {@link #of(String) factory} method passing the path name. | ||
| * @return a UnixDomainSocketAddress | ||
| */ | ||
| @java.io.Serial | ||
| private Object readResolve() { | ||
| return UnixDomainSocketAddress.of(pathname); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Returns a | ||
| * <a href="{@docRoot}/serialized-form.html#java.net.UnixDomainSocketAddress.Ser"> | ||
| * Ser</a> containing the path name of this instance. | ||
| * | ||
| * @return a {@link Ser} | ||
| * representing the path name of this instance | ||
| */ | ||
| @java.io.Serial | ||
| private Object writeReplace() throws ObjectStreamException { | ||
| return new Ser(path.toString()); | ||
| } | ||
|
|
||
| /** | ||
| * Throws InvalidObjectException, always. | ||
| * @param s the stream | ||
| * @throws java.io.InvalidObjectException always | ||
| */ | ||
| @java.io.Serial | ||
| private void readObject(java.io.ObjectInputStream s) | ||
| throws java.io.InvalidObjectException | ||
| { | ||
| throw new java.io.InvalidObjectException("Proxy required"); | ||
| } | ||
|
|
||
| /** | ||
| * Throws InvalidObjectException, always. | ||
| * @throws java.io.InvalidObjectException always | ||
| */ | ||
| @java.io.Serial | ||
| private void readObjectNoData() | ||
| throws java.io.InvalidObjectException | ||
| { | ||
| throw new java.io.InvalidObjectException("Proxy required"); | ||
| } | ||
|
|
||
| private UnixDomainSocketAddress(Path path) { | ||
| this.path = path; | ||
| } | ||
|
|
||
| /** | ||
| * Creates a UnixDomainSocketAddress from the given path string. | ||
| * | ||
| * @param pathname | ||
| * The path string, which can be empty | ||
| * | ||
| * @return A UnixDomainSocketAddress | ||
| * | ||
| * @throws InvalidPathException | ||
| * If the path cannot be converted to a Path | ||
| * | ||
| * @throws NullPointerException if pathname is {@code null} | ||
| */ | ||
| public static UnixDomainSocketAddress of(String pathname) { | ||
| return of(Path.of(pathname)); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a UnixDomainSocketAddress for the given path. | ||
| * | ||
| * @param path | ||
| * The path to the socket, which can be empty | ||
| * | ||
| * @return A UnixDomainSocketAddress | ||
| * | ||
| * @throws IllegalArgumentException | ||
| * If the path is not associated with the default file system | ||
| * | ||
| * @throws NullPointerException if path is {@code null} | ||
| */ | ||
| public static UnixDomainSocketAddress of(Path path) { | ||
| FileSystem fs = path.getFileSystem(); | ||
| if (fs != FileSystems.getDefault()) { | ||
| throw new IllegalArgumentException(); | ||
| } | ||
| if (fs.getClass().getModule() != Object.class.getModule()) { | ||
| throw new IllegalArgumentException(); | ||
| } | ||
| return new UnixDomainSocketAddress(path); | ||
| } | ||
|
|
||
| /** | ||
| * Returns this address's path. | ||
| * | ||
| * @return this address's path | ||
| */ | ||
| public Path getPath() { | ||
| return path; | ||
| } | ||
|
|
||
| /** | ||
| * Returns the hash code of this {@code UnixDomainSocketAddress} | ||
| */ | ||
| @Override | ||
| public int hashCode() { | ||
| return path.hashCode(); | ||
| } | ||
|
|
||
| /** | ||
| * Compares this address with another object. | ||
| * | ||
| * @return true if the path fields are equal | ||
| */ | ||
| @Override | ||
| public boolean equals(Object o) { | ||
| if (!(o instanceof UnixDomainSocketAddress)) | ||
| return false; | ||
| UnixDomainSocketAddress that = (UnixDomainSocketAddress)o; | ||
| return this.path.equals(that.path); | ||
| } | ||
|
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| /** | ||
| * Returns a string representation of this {@code UnixDomainSocketAddress}. | ||
| * | ||
| * @return this address's path which may be empty for an unnamed address | ||
| */ | ||
| @Override | ||
| public String toString() { | ||
| return path.toString(); | ||
| } | ||
| } |
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