author | egahlin |
Fri, 05 Jul 2019 03:36:40 +0200 | |
branch | JEP-349-branch |
changeset 57452 | 6fabe73e5d9a |
parent 57449 | 099789ceff7d |
permissions | -rw-r--r-- |
57449 | 1 |
/* |
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* Copyright (c) 2019, 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 jdk.jfr.consumer; |
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import java.io.IOException; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.VarHandle; |
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import java.security.AccessControlContext; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.time.Duration; |
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import java.time.Instant; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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57452
6fabe73e5d9a
Reduced allocation pressure. Fix getValue for startTime and duration
egahlin
parents:
57449
diff
changeset
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import java.util.Comparator; |
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import java.util.List; |
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import java.util.Objects; |
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import java.util.function.Consumer; |
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import jdk.jfr.EventType; |
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import jdk.jfr.internal.JVM; |
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import jdk.jfr.internal.LogLevel; |
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import jdk.jfr.internal.LogTag; |
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import jdk.jfr.internal.Logger; |
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import jdk.jfr.internal.LongMap; |
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import jdk.jfr.internal.consumer.InternalEventFilter; |
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abstract class EventConsumer implements Runnable { |
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public final static Instant NEXT_EVENT = Instant.now(); |
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57452
6fabe73e5d9a
Reduced allocation pressure. Fix getValue for startTime and duration
egahlin
parents:
57449
diff
changeset
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public final static Comparator<? super RecordedEvent> END_TIME = (e1, e2) -> Long.compare(e1.endTimeTicks, e2.endTimeTicks); |
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final static class EventDispatcher { |
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public final static EventDispatcher[] NO_DISPATCHERS = new EventDispatcher[0]; |
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final private String eventName; |
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final Consumer<RecordedEvent> action; |
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public EventDispatcher(Consumer<RecordedEvent> action) { |
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this(null, action); |
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} |
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public EventDispatcher(String eventName, Consumer<RecordedEvent> action) { |
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this.eventName = eventName; |
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this.action = action; |
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} |
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public void offer(RecordedEvent event) { |
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action.accept(event); |
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} |
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public boolean accepts(EventType eventType) { |
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return (eventName == null || eventType.getName().equals(eventName)); |
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} |
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} |
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private final static JVM jvm = JVM.getJVM(); |
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private final static VarHandle closedHandle; |
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private final static VarHandle consumersHandle; |
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private final static VarHandle dispatcherHandle; |
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private final static VarHandle flushActionsHandle; |
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private final static VarHandle closeActionsHandle; |
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private final static VarHandle orderedHandle; |
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private final static VarHandle reuseHandle; |
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private final static VarHandle startTimeHandle; |
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static { |
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try { |
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MethodHandles.Lookup l = MethodHandles.lookup(); |
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closedHandle = l.findVarHandle(EventConsumer.class, "closed", boolean.class); |
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consumersHandle = l.findVarHandle(EventConsumer.class, "consumers", EventDispatcher[].class); |
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dispatcherHandle = l.findVarHandle(EventConsumer.class, "dispatcher", LongMap.class); |
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flushActionsHandle = l.findVarHandle(EventConsumer.class, "flushActions", Runnable[].class); |
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closeActionsHandle = l.findVarHandle(EventConsumer.class, "closeActions", Runnable[].class); |
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orderedHandle = l.findVarHandle(EventConsumer.class, "ordered", boolean.class); |
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reuseHandle = l.findVarHandle(EventConsumer.class, "reuse", boolean.class); |
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startTimeHandle = l.findVarHandle(EventConsumer.class, "startTime", Instant.class); |
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} catch (ReflectiveOperationException e) { |
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throw new InternalError(e); |
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} |
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} |
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// set by VarHandle |
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private boolean closed; |
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// set by VarHandle |
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private EventDispatcher[] consumers = new EventDispatcher[0]; |
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// set by VarHandle |
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private LongMap<EventDispatcher[]> dispatcher = new LongMap<>(); |
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// set by VarHandle |
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private Runnable[] flushActions = new Runnable[0]; |
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// set by VarHandle |
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private Runnable[] closeActions = new Runnable[0]; |
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private final AccessControlContext accessControlContext; |
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protected volatile InternalEventFilter eventFilter = InternalEventFilter.ACCEPT_ALL; |
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private boolean started; |
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private Thread thread; |
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protected long startNanos; |
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protected boolean ordered = true; |
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protected boolean reuse = true; |
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Instant startTime; |
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public EventConsumer(AccessControlContext acc) throws IOException { |
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this.accessControlContext = acc; |
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} |
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public void run() { |
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doPriviliged(() -> execute()); |
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} |
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void doPriviliged(Runnable r) { |
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AccessController.doPrivileged(new PrivilegedAction<Void>() { |
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@Override |
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public Void run() { |
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r.run(); |
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return null; |
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} |
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}, accessControlContext); |
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} |
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private void execute() { |
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jvm.exclude(Thread.currentThread()); |
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try { |
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updateStartNanos(); |
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process(); |
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} catch (IOException e) { |
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if (!isClosed()) { |
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logException(e); |
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} |
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} catch (Exception e) { |
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logException(e); |
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} finally { |
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Logger.log(LogTag.JFR_SYSTEM_STREAMING, LogLevel.DEBUG, "Execution of stream ended."); |
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} |
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} |
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// User setting overrides default |
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private void updateStartNanos() { |
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if (startTime != null) { |
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try { |
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setStartNanos(startTime.toEpochMilli() * 1_000_000L); |
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} catch (ArithmeticException ae) { |
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setStartNanos(Long.MAX_VALUE); |
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} |
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} |
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} |
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private void logException(Exception e) { |
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e.printStackTrace(); // for debugging purposes, remove before |
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// integration |
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Logger.log(LogTag.JFR_SYSTEM_STREAMING, LogLevel.DEBUG, "Unexpected error processing stream. " + e.getMessage()); |
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} |
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public abstract void process() throws IOException; |
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public synchronized boolean remove(Object action) { |
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boolean remove = false; |
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Runnable[] updatedFlushActions = removeAction(flushActions, action); |
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if (updatedFlushActions != null) { |
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flushActionsHandle.setVolatile(this, updatedFlushActions); |
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remove = true; |
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} |
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Runnable[] updatedCloseActions = removeAction(closeActions, action); |
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if (updatedCloseActions != null) { |
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closeActionsHandle.setVolatile(this, updatedCloseActions); |
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remove = true; |
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} |
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boolean removeConsumer = false; |
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List<EventDispatcher> list = new ArrayList<>(); |
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for (int i = 0; i < consumers.length; i++) { |
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if (consumers[i].action != action) { |
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list.add(consumers[i]); |
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} else { |
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removeConsumer = true; |
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remove = true; |
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} |
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} |
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if (removeConsumer) { |
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EventDispatcher[] array = list.toArray(new EventDispatcher[list.size()]); |
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eventFilter = buildFilter(array); |
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consumersHandle.setVolatile(this, array); |
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dispatcherHandle.setVolatile(this, new LongMap<>()); // will reset |
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// dispatch |
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} |
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return remove; |
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} |
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public void dispatch(RecordedEvent e) { |
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EventDispatcher[] consumerDispatch = dispatcher.get(e.getEventType().getId()); |
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if (consumerDispatch == null) { |
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consumerDispatch = EventDispatcher.NO_DISPATCHERS; |
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for (EventDispatcher ec : consumers.clone()) { |
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if (ec.accepts(e.getEventType())) { |
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consumerDispatch = merge(consumerDispatch, ec); |
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} |
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} |
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dispatcher.put(e.getEventType().getId(), consumerDispatch); |
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} |
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for (int i = 0; i < consumerDispatch.length; i++) { |
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try { |
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consumerDispatch[i].offer(e); |
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} catch (Exception exception) { |
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// Is this a reasonable behavior for an exception? |
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// Error will abort the stream. |
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} |
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} |
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} |
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public void onEvent(Consumer<RecordedEvent> action) { |
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add(new EventDispatcher(action)); |
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} |
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public void onEvent(String eventName, Consumer<RecordedEvent> action) { |
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add(new EventDispatcher(eventName, action)); |
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} |
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InternalEventFilter buildFilter(EventDispatcher[] dispatchers) { |
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InternalEventFilter ef = new InternalEventFilter(); |
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for (EventDispatcher ed : dispatchers) { |
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String name = ed.eventName; |
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if (name == null) { |
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return InternalEventFilter.ACCEPT_ALL; |
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} |
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ef.setThreshold(name, 0); |
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} |
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return ef.threadSafe(); |
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} |
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private synchronized void add(EventDispatcher e) { |
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EventDispatcher[] dispatchers = merge(consumers, e); |
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eventFilter = buildFilter(dispatchers); |
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consumersHandle.setVolatile(this, dispatchers); |
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dispatcherHandle.setVolatile(this, new LongMap<>()); // will reset |
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} |
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public synchronized void onFlush(Runnable action) { |
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flushActionsHandle.setVolatile(this, addAction(flushActions, action)); |
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} |
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public synchronized void addCloseAction(Runnable action) { |
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closeActionsHandle.setVolatile(this, addAction(closeActions, action)); |
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} |
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public void setClosed(boolean closed) { |
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closedHandle.setVolatile(this, closed); |
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} |
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final public boolean isClosed() { |
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return closed; |
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} |
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public void runCloseActions() { |
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Runnable[] cas = this.closeActions; |
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for (int i = 0; i < cas.length; i++) { |
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cas[i].run(); |
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} |
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} |
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public void runFlushActions() { |
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Runnable[] fas = this.flushActions; |
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for (int i = 0; i < fas.length; i++) { |
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fas[i].run(); |
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} |
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} |
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public void startAsync(long startNanos) { |
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if (started) { |
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throw new IllegalStateException("Event stream can only be started once"); |
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} |
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started = true; |
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setStartNanos(startNanos); |
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thread = new Thread(this); |
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thread.setDaemon(true); |
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thread.start(); |
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} |
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public void start(long startNanos) { |
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synchronized (this) { |
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if (started) { |
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throw new IllegalStateException("Event stream can only be started once"); |
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} |
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started = true; |
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setStartNanos(startNanos); |
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} |
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run(); |
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} |
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public void awaitTermination(Duration timeout) { |
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Objects.requireNonNull(timeout); |
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Thread t = null; |
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synchronized (this) { |
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t = thread; |
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} |
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if (t != null && t != Thread.currentThread()) { |
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try { |
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t.join(timeout.toMillis()); |
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} catch (InterruptedException e) { |
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// ignore |
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} |
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} |
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} |
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public void awaitTermination() { |
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awaitTermination(Duration.ofMillis(0)); |
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} |
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private void setStartNanos(long startNanos) { |
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this.startNanos = startNanos; |
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} |
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protected static EventDispatcher[] merge(EventDispatcher[] current, EventDispatcher add) { |
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EventDispatcher[] array = new EventDispatcher[current.length + 1]; |
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System.arraycopy(current, 0, array, 0, current.length); |
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array[current.length] = add; |
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return array; |
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} |
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private static Runnable[] removeAction(Runnable[] array, Object action) { |
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if (array.length == 0) { |
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return null; |
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} |
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boolean remove = false; |
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List<Runnable> list = new ArrayList<>(); |
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for (int i = 0; i < array.length; i++) { |
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if (array[i] != action) { |
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list.add(array[i]); |
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} else { |
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remove = true; |
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} |
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} |
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if (remove) { |
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return list.toArray(new Runnable[list.size()]); |
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} |
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return null; |
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} |
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private static Runnable[] addAction(Runnable[] array, Runnable action) { |
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ArrayList<Runnable> a = new ArrayList<>(); |
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a.addAll(Arrays.asList(array)); |
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a.add(action); |
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return a.toArray(new Runnable[0]); |
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} |
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abstract public void close(); |
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371 |
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372 |
public void setReuse(boolean reuse) { |
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373 |
reuseHandle.setVolatile(this, reuse); |
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} |
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375 |
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376 |
public void setOrdered(boolean ordered) { |
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377 |
orderedHandle.setVolatile(this, ordered); |
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} |
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379 |
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380 |
public void setStartTime(Instant startTime) { |
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381 |
Objects.nonNull(startTime); |
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382 |
if (started) { |
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383 |
throw new IllegalStateException("Stream is already started"); |
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384 |
} |
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385 |
if (startTime.isBefore(Instant.EPOCH)) { |
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386 |
startTime = Instant.EPOCH; |
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387 |
} |
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startTimeHandle.setVolatile(this, startTime); |
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389 |
} |
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390 |
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391 |
} |