add io_uring support

dependencies/pom.xml

@@ -120,6 +120,7 @@
         <version.lib.mysql-connector-java>8.0.22</version.lib.mysql-connector-java>
         <version.lib.narayana>5.12.0.Final</version.lib.narayana>
         <version.lib.netty>4.1.63.Final</version.lib.netty>
+        <version.lib.netty-io_uring>0.0.8.Final</version.lib.netty-io_uring>
         <version.lib.oci-java-sdk-objectstorage>2.3.0</version.lib.oci-java-sdk-objectstorage>
         <version.lib.ojdbc8>21.3.0.0</version.lib.ojdbc8>
         <version.lib.database.messaging>19.3.0.0</version.lib.database.messaging>
@@ -1269,6 +1270,12 @@
                 <version>${version.lib.netty}</version>
                 <classifier>osx-x86_64</classifier>
             </dependency>
+            <dependency>
+                <groupId>io.netty.incubator</groupId>
+                <artifactId>netty-incubator-transport-native-io_uring</artifactId>
+                <version>${version.lib.netty-io_uring}</version>
+                <classifier>linux-x86_64</classifier>
+            </dependency>
             <dependency>
                 <groupId>io.netty</groupId>
                 <artifactId>netty-common</artifactId>

webserver/transport/netty/iouring/pom.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2021 Oracle and/or its affiliates.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+-->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>io.helidon.webserver.transport.netty</groupId>
+        <artifactId>helidon-webserver-transport-netty-project</artifactId>
+        <version>2.4.0-SNAPSHOT</version>
+    </parent>
+    <artifactId>helidon-webserver-transport-netty-iouring</artifactId>
+    <name>Helidon WebServer Transport Netty io_uring</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.helidon.webserver</groupId>
+            <artifactId>helidon-webserver</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.netty.incubator</groupId>
+            <artifactId>netty-incubator-transport-native-io_uring</artifactId>
+            <classifier>linux-x86_64</classifier>
+        </dependency>
+
+    </dependencies>
+
+</project>

webserver/transport/netty/iouring/src/main/java/io/helidon/webserver/transport/netty/iouring/IOUringTransport.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.helidon.webserver.transport.netty.iouring;
+
+import java.util.Optional;
+
+import io.helidon.webserver.ServerConfiguration;
+import io.helidon.webserver.Transport;
+import io.helidon.webserver.WebServer;
+
+import io.netty.channel.ChannelFactory;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.ServerChannel;
+import io.netty.incubator.channel.uring.IOUring;
+import io.netty.incubator.channel.uring.IOUringEventLoopGroup;
+import io.netty.incubator.channel.uring.IOUringServerSocketChannel;
+
+
+/**
+ * A {@link Transport} implementation based upon Netty's <a
+ * href="https://netty.io/wiki/native-transports.html#using-the-linux-native-transport"
+ * target="_parent">iouring-based native transport</a>.
+ *
+ * <p>This {@link Transport} implementation is currently experimental
+ * and its API and implementation are subject to change.</p>
+ */
+public final class IOUringTransport implements Transport {
+
+    /**
+     * Returns {@code true} when {@link IOUring#isAvailable()} returns
+     * {@code true} and {@code false} otherwise.
+     *
+     * @return {@code true} when {@link IOUring#isAvailable()} returns
+     * {@code true}; {@code false} otherwise
+     */
+    @Override
+    public boolean isAvailableFor(WebServer webServer) {
+        return IOUring.isAvailable();
+    }
+
+    /**
+     * Returns an artifact corresponding to the supplied artifact
+     * coordinates, if one is available.
+     *
+     * <p>Specifically, this method will return a non-{@linkplain
+     * Optional#isEmpty() empty <code>Optional</code>} only if one of the
+     * following conditions is true:</p>
+     *
+     * <ul>
+     *
+     * <li>{@code artifactType} is a subtype of {@link EventLoopGroup}
+     * and {@code artifactName} is exactly {@linkplain
+     * String#equals(Object) equal} to either {@code bossGroup} or
+     * {@code workerGroup}</li>
+     *
+     * <li>{@code artifactType} is a subtype of {@link ChannelFactory}
+     * and {@code artifactName} is exactly {@linkplain
+     * String#equals(Object) equal} to {@code serverChannelFactory}</li>
+     *
+     * </ul>
+     *
+     * @param artifactType a {@link Class} indicating the kind of
+     * artifact to be returned; must not be {@code null}; may usefully
+     * only be a subtype of either {@link EventLoopGroup} or
+     * {@linkplain ChannelFactory <code>ChannelFactory&lt;? extends
+     * ServerChannel&gt;</code>}
+     *
+     * @param artifactName a {@link String} indicating which of
+     * possibly several artifacts of the same kind to be returned;
+     * must not be {@code null}
+     *
+     * @param config the {@link ServerConfiguration} in effect; must
+     * not be {@code null}
+     *
+     * @return an {@link Optional}, which may be {@linkplain
+     * Optional#isEmpty() empty} but which will never be {@code null}
+     *
+     * @exception NullPointerException if any argument is {@code null}
+     *
+     * @see IOUring
+     *
+     * @see IOUringEventLoopGroup
+     *
+     * @see IOUringServerSocketChannel
+     */
+    @Override
+    @SuppressWarnings("unchecked")
+    public <T> Optional<T> createTransportArtifact(Class<T> artifactType,
+                                                   String artifactName,
+                                                   ServerConfiguration config) {
+        if (EventLoopGroup.class.isAssignableFrom(artifactType)) {
+            switch (artifactName) {
+            case "bossGroup":
+                return Optional.of((T) new IOUringEventLoopGroup(config.sockets().size()));
+            case "workerGroup":
+                return Optional.of((T) new IOUringEventLoopGroup(Math.max(0, config.workersCount())));
+            default:
+                return Optional.empty();
+            }
+        } else if (ChannelFactory.class.isAssignableFrom(artifactType)) {
+            switch (artifactName) {
+            case "serverChannelFactory":
+                ChannelFactory<? extends ServerChannel> cf = IOUringServerSocketChannel::new;
+                return Optional.of((T) cf);
+            default:
+                return Optional.empty();
+            }
+        } else {
+            return Optional.empty();
+        }
+    }
+
+}

webserver/transport/netty/iouring/src/main/java/io/helidon/webserver/transport/netty/iouring/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Netty io_uring Transport implementation.
+ */
+package io.helidon.webserver.transport.netty.iouring;

webserver/transport/netty/iouring/src/main/java/module-info.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Netty IOURING transport.
+ */
+module io.helidon.webserver.transport.netty.iouring {
+    requires io.helidon.webserver;
+
+    requires io.netty.transport;
+
+    requires io.netty.incubator.transport.io_uring;
+
+    exports io.helidon.webserver.transport.netty.iouring;
+}

webserver/transport/netty/pom.xml

@@ -33,5 +33,6 @@
 
     <modules>
         <module>epoll</module>
+        <module>iouring</module>
     </modules>
 </project>