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/*
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* Copyright (c) 2018, 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 sun.net.ext;
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import java.io.FileDescriptor;
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import java.net.SocketException;
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import java.net.SocketOption;
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import java.util.Collections;
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import java.util.Set;
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/**
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* Defines the infrastructure to support RDMA socket options.
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*
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* RDMA socket options are accessed through the jdk.net API, which is in
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* the jdk.net module.
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*/
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public abstract class RdmaSocketOptions {
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private final Set<SocketOption<?>> options;
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/** Tells whether or not the option is supported. */
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public final boolean isOptionSupported(SocketOption<?> option) {
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return options().contains(option);
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}
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/** Return the, possibly empty, set of RDMA socket options available. */
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public final Set<SocketOption<?>> options() { return options; }
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/** Sets the value of a socket option, for the given socket. */
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public abstract void setOption(FileDescriptor fd, SocketOption<?> option,
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Object value) throws SocketException;
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/** Returns the value of a socket option, for the given socket. */
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public abstract Object getOption(FileDescriptor fd, SocketOption<?> option)
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throws SocketException;
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protected RdmaSocketOptions(Set<SocketOption<?>> options) {
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this.options = options;
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}
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private static volatile RdmaSocketOptions instance;
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public static final RdmaSocketOptions getInstance() { return instance; }
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/** Registers support for RDMA socket options. Invoked by the jdk.net module. */
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public static final void register(RdmaSocketOptions rdmaOptions) {
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if (instance != null)
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throw new InternalError("Attempting to reregister RDMA options");
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instance = rdmaOptions;
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}
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static {
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try {
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// If the class is present, it will be initialized which
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// triggers registration of the RDMA socket options.
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Class<?> c = Class.forName("jdk.net.RdmaSocketOptions");
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} catch (ClassNotFoundException e) {
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// the jdk.net module is not present => no RDMA socket options
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instance = new NoRdmaSocketOptions();
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}
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}
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static final class NoRdmaSocketOptions extends RdmaSocketOptions {
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NoRdmaSocketOptions() {
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super(Collections.<SocketOption<?>>emptySet());
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}
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@Override
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public void setOption(FileDescriptor fd, SocketOption<?> option,
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Object value) throws SocketException
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{
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throw new UnsupportedOperationException(
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"no RDMA options: " + option.name());
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}
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@Override
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public Object getOption(FileDescriptor fd, SocketOption<?> option)
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throws SocketException
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{
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throw new UnsupportedOperationException(
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"no RDMA options: " + option.name());
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}
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}
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}
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