Quelle ReferenceTracker.java Sprache: JAVA

/*
* Copyright (c) 2018, 2022, 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.
*
* 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.
*/

import jdk.internal.net.http.common.OperationTrackers;
import jdk.internal.net.http.common.OperationTrackers.Tracker;

import java.io.PrintStream;
import java.lang.management.LockInfo;
import java.lang.management.ManagementFactory;
import java.lang.management.MonitorInfo;
import java.lang.management.ThreadInfo;
import java.net.http.HttpClient;
import java.time.Duration;
import java.util.Arrays;
import java.util.Objects;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.function.Predicate;
import java.util.stream.Collectors;

/**
* A small helper class to help track clients which still
* have pending operations at the end of a test.
*/
public class ReferenceTracker {
    private final ConcurrentLinkedQueue<Tracker> TRACKERS
            = new ConcurrentLinkedQueue<Tracker>();

    public static final ReferenceTracker INSTANCE
            = new ReferenceTracker();

    public HttpClient track(HttpClient client) {
        Tracker tracker = OperationTrackers.getTracker(client);
        assert tracker != null;
        TRACKERS.add(tracker);
        return client;
    }

    public long getTrackedClientCount() {
        return TRACKERS.size();
    }

    public StringBuilder diagnose(StringBuilder warnings) {
        return diagnose(warnings, (t) -> t.getOutstandingHttpOperations() > 0);
    }

    public StringBuilder diagnose(Tracker tracker, StringBuilder warnings, Predicate<Tracker> hasOutstanding) {
        checkOutstandingOperations(warnings, tracker, hasOutstanding);
        return warnings;
    }

    public StringBuilder diagnose(StringBuilder warnings, Predicate<Tracker> hasOutstanding) {
        for (Tracker tracker : TRACKERS) {
            diagnose(tracker, warnings, hasOutstanding);
        }
        return warnings;
    }

    public boolean hasOutstandingOperations() {
        return TRACKERS.stream().anyMatch(t -> t.getOutstandingOperations() > 0);
    }

    public boolean hasOutstandingSubscribers() {
        return TRACKERS.stream().anyMatch(t -> t.getOutstandingSubscribers() > 0);
    }

    public long getOutstandingOperationsCount() {
        return TRACKERS.stream()
                .map(Tracker::getOutstandingOperations)
                .filter(n -> n > 0)
                .collect(Collectors.summingLong(n -> n));
    }

    public long getOutstandingClientCount() {
        return TRACKERS.stream()
                .map(Tracker::getOutstandingOperations)
                .filter(n -> n > 0)
                .count();
    }

    public AssertionError check(Tracker tracker, long graceDelayMs) {
        Predicate<Tracker> hasOperations = (t) -> t.getOutstandingOperations() > 0;
        Predicate<Tracker> hasSubscribers = (t) -> t.getOutstandingSubscribers() > 0;
        return check(tracker, graceDelayMs,
                hasOperations.or(hasSubscribers)
                        .or(Tracker::isFacadeReferenced)
                        .or(Tracker::isSelectorAlive),
                "outstanding operations or unreleased resources", true);
    }

    public AssertionError check(long graceDelayMs) {
        Predicate<Tracker> hasOperations = (t) -> t.getOutstandingOperations() > 0;
        Predicate<Tracker> hasSubscribers = (t) -> t.getOutstandingSubscribers() > 0;
        return check(graceDelayMs,
                hasOperations.or(hasSubscribers)
                .or(Tracker::isFacadeReferenced)
                .or(Tracker::isSelectorAlive),
        "outstanding operations or unreleased resources", true);
    }

    // This method is copied from ThreadInfo::toString, but removes the
    // limit on the stack trace depth (8 frames max) that ThreadInfo::toString
    // forcefully implement. We want to print all frames for better diagnosis.
    private static String toString(ThreadInfo info) {
        StringBuilder sb = new StringBuilder("\"" + info.getThreadName() + "\"" +
                (info.isDaemon() ? " daemon" : "") +
                " prio=" + info.getPriority() +
                " Id=" + info.getThreadId() + " " +
                info.getThreadState());
        if (info.getLockName() != null) {
            sb.append(" on " + info.getLockName());
        }
        if (info.getLockOwnerName() != null) {
            sb.append(" owned by \"" + info.getLockOwnerName() +
                    "\" Id=" + info.getLockOwnerId());
        }
        if (info.isSuspended()) {
            sb.append(" (suspended)");
        }
        if (info.isInNative()) {
            sb.append(" (in native)");
        }
        sb.append('\n');
        int i = 0;
        var stackTrace = info.getStackTrace();
        for (; i < stackTrace.length ; i++) {
            StackTraceElement ste = stackTrace[i];
            sb.append("\tat " + ste.toString());
            sb.append('\n');
            if (i == 0 && info.getLockInfo() != null) {
                Thread.State ts = info.getThreadState();
                switch (ts) {
                    case BLOCKED:
                        sb.append("\t- blocked on " + info.getLockInfo());
                        sb.append('\n');
                        break;
                    case WAITING:
                        sb.append("\t- waiting on " + info.getLockInfo());
                        sb.append('\n');
                        break;
                    case TIMED_WAITING:
                        sb.append("\t- waiting on " + info.getLockInfo());
                        sb.append('\n');
                        break;
                    default:
                }
            }

            for (MonitorInfo mi : info.getLockedMonitors()) {
                if (mi.getLockedStackDepth() == i) {
                    sb.append("\t- locked " + mi);
                    sb.append('\n');
                }
            }
        }
        if (i < stackTrace.length) {
            sb.append("\t...");
            sb.append('\n');
        }

        LockInfo[] locks = info.getLockedSynchronizers();
        if (locks.length > 0) {
            sb.append("\n\tNumber of locked synchronizers = " + locks.length);
            sb.append('\n');
            for (LockInfo li : locks) {
                sb.append("\t- " + li);
                sb.append('\n');
            }
        }
        sb.append('\n');
        return sb.toString();
    }

    private void printThreads(String why, PrintStream out) {
        out.println(why);
        Arrays.stream(ManagementFactory.getThreadMXBean()
                        .dumpAllThreads(true, true))
                .map(ReferenceTracker::toString)
                .forEach(out::println);
    }

    public Tracker getTracker(HttpClient client) {
        return OperationTrackers.getTracker(Objects.requireNonNull(client));
    }

    public AssertionError check(Tracker tracker,
                                long graceDelayMs,
                                Predicate<Tracker> hasOutstanding,
                                String description,
                                boolean printThreads) {
        AssertionError fail = null;
        graceDelayMs = Math.max(graceDelayMs, 100);
        long delay = Math.min(graceDelayMs, 10);
        var count = delay > 0 ? graceDelayMs / delay : 1;
        long waitStart = System.nanoTime();
        long waited = 0;
        long toWait = Math.min(graceDelayMs, Math.max(delay, 1));
        for (int i = 0; i < count; i++) {
            if (hasOutstanding.test(tracker)) {
                System.gc();
                try {
                    if (i == 0) {
                        System.out.println("Waiting for HTTP operations to terminate...");
                    }
                    waited += toWait;
                    Thread.sleep(toWait);
                } catch (InterruptedException x) {
                    // OK
                }
            } else {
                System.out.println("No outstanding HTTP operations remaining after "
                        + i + "/" + count + " iterations and " + waited + "/" + graceDelayMs
                        + " ms, (wait/iteration " + toWait + " ms)");
                break;
            }
        }
        long duration = Duration.ofNanos(System.nanoTime() - waitStart).toMillis();
        if (hasOutstanding.test(tracker)) {
            StringBuilder warnings = diagnose(tracker, new StringBuilder(), hasOutstanding);
            if (hasOutstanding.test(tracker)) {
                fail = new AssertionError(warnings.toString());
            }
        } else {
            System.out.println("PASSED: No " + description + " found in "
                    + tracker.getName() + " in " + duration + " ms");
        }
        if (fail != null) {
            if (printThreads && tracker.isSelectorAlive()) {
                var msg = "Selector manager threads are still alive for " + tracker.getName() + ": ";
                printThreads(msg, System.out);
                printThreads(msg, System.err);
            }
            System.out.println("AssertionError: Found some " + description + " in "
                    + tracker.getName() + " after " + duration + " ms, waited " + waited + " ms");
        }
        return fail;
    }

    public AssertionError check(long graceDelayMs,
                                Predicate<Tracker> hasOutstanding,
                                String description,
                                boolean printThreads) {
        AssertionError fail = null;
        graceDelayMs = Math.max(graceDelayMs, 100);
        long delay = Math.min(graceDelayMs, 10);
        var count = delay > 0 ? graceDelayMs / delay : 1;
        for (int i = 0; i < count; i++) {
            if (TRACKERS.stream().anyMatch(hasOutstanding)) {
                System.gc();
                try {
                    if (i == 0) {
                        System.out.println("Waiting for HTTP operations to terminate...");
                    }
                    Thread.sleep(Math.min(graceDelayMs, Math.max(delay, 1)));
                } catch (InterruptedException x) {
                    // OK
                }
            } else break;
        }
        if (TRACKERS.stream().anyMatch(hasOutstanding)) {
            StringBuilder warnings = diagnose(new StringBuilder(), hasOutstanding);
            addSummary(warnings);
            if (TRACKERS.stream().anyMatch(hasOutstanding)) {
                fail = new AssertionError(warnings.toString());
            }
        } else {
            System.out.println("PASSED: No " + description + " found in "
                    + getTrackedClientCount() + " clients");
        }
        if (fail != null) {
            Predicate<Tracker> isAlive = Tracker::isSelectorAlive;
            if (printThreads && TRACKERS.stream().anyMatch(isAlive)) {
                printThreads("Some selector manager threads are still alive: ", System.out);
                printThreads("Some selector manager threads are still alive: ", System.err);
            }
        }
        return fail;
    }

    private void addSummary(StringBuilder warning) {
        long activeClients = getOutstandingClientCount();
        long operations = getOutstandingOperationsCount();
        long tracked = getTrackedClientCount();
        if (warning.length() > 0) warning.append("\n");
        int pos = warning.length();
        warning.append("Found ")
                .append(activeClients)
                .append(" client still active, with ")
                .append(operations)
                .append(" operations still pending out of ")
                .append(tracked)
                .append(" tracked clients.");
        System.out.println(warning.substring(pos));
        System.err.println(warning.substring(pos));
    }

    private static void checkOutstandingOperations(StringBuilder warning,
                                                   Tracker tracker,
                                                   Predicate<Tracker> hasOutsanding) {
        if (hasOutsanding.test(tracker)) {
            if (warning.length() > 0) warning.append("\n");
            int pos = warning.length();
            warning.append("WARNING: tracker for " + tracker.getName() + " has outstanding operations:");
            warning.append("\n\tPending HTTP Requests: " + tracker.getOutstandingHttpRequests());
            warning.append("\n\tPending HTTP/1.1 operations: " + tracker.getOutstandingHttpOperations());
            warning.append("\n\tPending HTTP/2 streams: " + tracker.getOutstandingHttp2Streams());
            warning.append("\n\tPending WebSocket operations: " + tracker.getOutstandingWebSocketOperations());
            warning.append("\n\tPending TCP connections: " + tracker.getOutstandingTcpConnections());
            warning.append("\n\tPending Subscribers: " + tracker.getOutstandingSubscribers());
            warning.append("\n\tTotal pending operations: " + tracker.getOutstandingOperations());
            warning.append("\n\tFacade referenced: " + tracker.isFacadeReferenced());
            warning.append("\n\tSelector alive: " + tracker.isSelectorAlive());
            System.out.println(warning.substring(pos));
            System.err.println(warning.substring(pos));
        }
    }

    private boolean isSelectorManager(Thread t) {
        String name = t.getName();
        if (name == null) return false;
        return name.contains("SelectorManager");
    }

    // This is a slightly more permissive check than the default checks,
    // it only verifies that all CFs returned by send/sendAsync have been
    // completed, and that all opened channels have been closed, and that
    // the selector manager thread has exited.
    // It doesn't check that all refcounts have reached 0.
    // This is typically useful to only check that resources have been released.
    public AssertionError checkShutdown(long graceDelayMs) {
        Predicate<Tracker> isAlive = Tracker::isSelectorAlive;
        Predicate<Tracker> hasPendingRequests = (t) -> t.getOutstandingHttpRequests() > 0;
        Predicate<Tracker> hasPendingConnections = (t) -> t.getOutstandingTcpConnections() > 0;
        Predicate<Tracker> hasPendingSubscribers = (t) -> t.getOutstandingSubscribers() > 0;
        AssertionError failed = check(graceDelayMs,
                isAlive.or(hasPendingRequests)
                        .or(hasPendingConnections)
                        .or(hasPendingSubscribers),
                "outstanding unclosed resources", true);
        return failed;
    }
}

quality87%

¤ Dauer der Verarbeitung: 0.36 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.