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Implemented support for virtual threads for HTTP/1.1, HTTP/2 and HTTP/3. The virtual thread support is in AdaptiveExecutionStrategy. When virtual threads are supported and enabled, reserved threads are disabled and blocking tasks are run in a virtual thread instead that being executed by the Executor. Signed-off-by: Simone Bordet <[email protected]>
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161
jetty-util/src/main/java/org/eclipse/jetty/util/VirtualThreads.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| // | ||
| // ======================================================================== | ||
| // Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others. | ||
| // | ||
| // This program and the accompanying materials are made available under the | ||
| // terms of the Eclipse Public License v. 2.0 which is available at | ||
| // https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0 | ||
| // which is available at https://www.apache.org/licenses/LICENSE-2.0. | ||
| // | ||
| // SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 | ||
| // ======================================================================== | ||
| // | ||
|
|
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| package org.eclipse.jetty.util; | ||
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|
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| import java.lang.reflect.Method; | ||
| import java.util.concurrent.Executor; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
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| /** | ||
| * <p>Utility class to use to query the runtime for virtual thread support, | ||
| * and, if virtual threads are supported, to start virtual threads.</p> | ||
| * | ||
| * @see #areSupported() | ||
| * @see #startVirtualThread(Runnable) | ||
| * @see #isVirtualThread() | ||
| */ | ||
| public class VirtualThreads | ||
| { | ||
| private static final Logger LOG = LoggerFactory.getLogger(VirtualThreads.class); | ||
| private static final Method startVirtualThread = probeStartVirtualThread(); | ||
| private static final Method isVirtualThread = probeIsVirtualThread(); | ||
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| private static Method probeStartVirtualThread() | ||
| { | ||
| try | ||
| { | ||
| return Thread.class.getMethod("startVirtualThread", Runnable.class); | ||
| } | ||
| catch (Throwable x) | ||
| { | ||
| return null; | ||
| } | ||
| } | ||
|
|
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| private static Method probeIsVirtualThread() | ||
| { | ||
| try | ||
| { | ||
| return Thread.class.getMethod("isVirtual"); | ||
| } | ||
| catch (Throwable x) | ||
| { | ||
| return null; | ||
| } | ||
| } | ||
|
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| private static void warn() | ||
| { | ||
| LOG.warn("Virtual thread support is not available (or not enabled via --enable-preview) in the current Java runtime ({})", System.getProperty("java.version")); | ||
| } | ||
|
|
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| /** | ||
| * @return whether the runtime supports virtual threads | ||
| */ | ||
| public static boolean areSupported() | ||
| { | ||
| return startVirtualThread != null; | ||
| } | ||
|
|
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| /** | ||
| * <p>Starts a virtual thread to execute the given task, or throws | ||
| * {@link UnsupportedOperationException} if virtual threads are not | ||
| * supported.</p> | ||
| * | ||
| * @param task the task to execute in a virtual thread | ||
| * @see #areSupported() | ||
| */ | ||
| public static void startVirtualThread(Runnable task) | ||
| { | ||
| try | ||
| { | ||
| if (LOG.isDebugEnabled()) | ||
| LOG.debug("Starting in virtual thread: {}", task); | ||
| startVirtualThread.invoke(null, task); | ||
| } | ||
| catch (Throwable x) | ||
| { | ||
| warn(); | ||
| throw new UnsupportedOperationException(x); | ||
| } | ||
| } | ||
|
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| /** | ||
| * @return whether the current thread is a virtual thread | ||
| */ | ||
| public static boolean isVirtualThread() | ||
| { | ||
| try | ||
| { | ||
| return (Boolean)isVirtualThread.invoke(Thread.currentThread()); | ||
| } | ||
| catch (Throwable x) | ||
| { | ||
| warn(); | ||
| return false; | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * <p>Tests whether the given executor implements {@link Configurable} and | ||
| * it has been configured to use virtual threads.</p> | ||
| * | ||
| * @param executor the Executor to test | ||
| * @return whether the given executor implements {@link Configurable} | ||
| * and it has been configured to use virtual threads | ||
| */ | ||
| public static boolean isUseVirtualThreads(Executor executor) | ||
| { | ||
| if (executor instanceof Configurable) | ||
| return ((Configurable)executor).isUseVirtualThreads(); | ||
| return false; | ||
| } | ||
|
|
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| /** | ||
| * <p>Implementations of this interface can be configured to use virtual threads.</p> | ||
| * <p>Whether virtual threads are actually used depends on whether the runtime | ||
| * supports virtual threads and, if the runtime supports them, whether they are | ||
| * configured to be used via {@link #setUseVirtualThreads(boolean)}.</p> | ||
| */ | ||
| public interface Configurable | ||
| { | ||
| /** | ||
| * @return whether to use virtual threads | ||
| */ | ||
| default boolean isUseVirtualThreads() | ||
| { | ||
| return false; | ||
| } | ||
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| /** | ||
| * @param useVirtualThreads whether to use virtual threads | ||
| * @throws UnsupportedOperationException if the runtime does not support virtual threads | ||
| * @see #areSupported() | ||
| */ | ||
| default void setUseVirtualThreads(boolean useVirtualThreads) | ||
| { | ||
| if (useVirtualThreads && !VirtualThreads.areSupported()) | ||
| { | ||
| warn(); | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| } | ||
| } | ||
|
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| private VirtualThreads() | ||
| { | ||
| } | ||
| } |
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