author | egahlin |
Fri, 24 May 2019 19:39:31 +0200 | |
branch | JEP-349-branch |
changeset 57372 | 50ca040843ea |
child 57373 | 400db63e4937 |
permissions | -rw-r--r-- |
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/* |
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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.internal.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.util.ArrayList; |
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import java.util.Arrays; |
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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.consumer.LongMap; |
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import jdk.jfr.consumer.RecordedEvent; |
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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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abstract public class EventConsumer implements Runnable { |
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private 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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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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} 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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protected InternalEventFilter eventFilter = InternalEventFilter.ACCEPT_ALL; |
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private final AccessControlContext accessControlContext; |
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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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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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process(); |
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} catch (Throwable e) { |
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e.printStackTrace(); |
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Logger.log(LogTag.JFR_SYSTEM_STREAMING, LogLevel.DEBUG, "Unexpectedexception iterating consumer."); |
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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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public abstract void process() throws Exception; |
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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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168 |
EventDispatcher[] array = list.toArray(new EventDispatcher[list.size()]); |
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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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|
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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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181 |
if (ec.accepts(e.getEventType())) { |
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consumerDispatch = merge(consumerDispatch, ec); |
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183 |
} |
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184 |
} |
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dispatcher.put(e.getEventType().getId(), consumerDispatch); |
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186 |
} |
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187 |
for (int i = 0; i < consumerDispatch.length; i++) { |
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188 |
consumerDispatch[i].offer(e); |
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189 |
} |
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190 |
|
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191 |
} |
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192 |
|
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193 |
public void onEvent(Consumer<RecordedEvent> action) { |
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194 |
add(new EventDispatcher(action)); |
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195 |
} |
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196 |
|
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197 |
public void onEvent(String eventName, Consumer<RecordedEvent> action) { |
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198 |
add(new EventDispatcher(eventName, action)); |
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199 |
} |
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200 |
|
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201 |
private synchronized void add(EventDispatcher e) { |
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202 |
consumersHandle.setVolatile(this, merge(consumers, e)); |
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203 |
dispatcherHandle.setVolatile(this, new LongMap<>()); // will reset |
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204 |
} |
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205 |
|
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206 |
public synchronized void onFlush(Runnable action) { |
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207 |
flushActionsHandle.setVolatile(this, addAction(flushActions, action)); |
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208 |
} |
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|
209 |
|
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210 |
public synchronized void addCloseAction(Runnable action) { |
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closeActionsHandle.setVolatile(this, addAction(closeActions, action)); |
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212 |
} |
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213 |
|
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214 |
public void setClosed(boolean closed) { |
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closedHandle.setVolatile(this, closed); |
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216 |
} |
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217 |
|
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218 |
final public boolean isClosed() { |
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return closed; |
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220 |
} |
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221 |
|
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222 |
public void runCloseActions() { |
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223 |
|
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224 |
Runnable[] cas = this.closeActions; |
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|
225 |
for (int i = 0; i < cas.length; i++) { |
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|
226 |
cas[i].run(); |
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|
227 |
} |
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|
228 |
} |
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|
229 |
|
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|
230 |
public void runFlushActions() { |
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|
231 |
Runnable[] fas = this.flushActions; |
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|
232 |
for (int i = 0; i < fas.length; i++) { |
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|
233 |
fas[i].run(); |
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|
234 |
} |
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|
235 |
} |
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|
236 |
|
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|
237 |
public synchronized void startAsync(long startNanos) { |
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|
238 |
if (started) { |
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|
239 |
throw new IllegalStateException("Event stream can only be started once"); |
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|
240 |
} |
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|
241 |
started = true; |
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|
242 |
setStartNanos(startNanos); |
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|
243 |
thread = new Thread(this); |
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|
244 |
thread.setDaemon(true); |
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|
245 |
thread.start(); |
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|
246 |
} |
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|
247 |
|
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|
248 |
public void start(long startNanos) { |
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|
249 |
synchronized (this) { |
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|
250 |
if (started) { |
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|
251 |
throw new IllegalStateException("Event stream can only be started once"); |
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|
252 |
} |
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|
253 |
started = true; |
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|
254 |
setStartNanos(startNanos); |
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|
255 |
} |
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|
256 |
run(); |
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|
257 |
} |
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|
258 |
|
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|
259 |
public void awaitTermination(Duration timeout) { |
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|
260 |
Objects.requireNonNull(timeout); |
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|
261 |
Thread t = null; |
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|
262 |
synchronized (this) { |
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|
263 |
t = thread; |
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|
264 |
} |
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|
265 |
if (t != null && t != Thread.currentThread()) { |
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|
266 |
try { |
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|
267 |
t.join(timeout.toMillis()); |
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|
268 |
} catch (InterruptedException e) { |
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|
269 |
// ignore |
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|
270 |
} |
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|
271 |
} |
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|
272 |
} |
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|
273 |
|
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|
274 |
public void awaitTermination() { |
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|
275 |
awaitTermination(Duration.ofMillis(0)); |
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|
276 |
} |
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|
277 |
|
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|
278 |
private void setStartNanos(long startNanos) { |
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|
279 |
this.startNanos = startNanos; |
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|
280 |
} |
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|
281 |
|
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|
282 |
protected static EventDispatcher[] merge(EventDispatcher[] current, EventDispatcher add) { |
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|
283 |
EventDispatcher[] array = new EventDispatcher[current.length + 1]; |
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|
284 |
System.arraycopy(current, 0, array, 0, current.length); |
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|
285 |
array[current.length] = add; |
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|
286 |
return array; |
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|
287 |
} |
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|
288 |
|
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|
289 |
private static Runnable[] removeAction(Runnable[] array, Object action) { |
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|
290 |
if (array.length == 0) { |
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|
291 |
return null; |
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|
292 |
} |
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|
293 |
boolean remove = false; |
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|
294 |
List<Runnable> list = new ArrayList<>(); |
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|
295 |
for (int i = 0; i < array.length; i++) { |
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|
296 |
if (array[i] != action) { |
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|
297 |
list.add(array[i]); |
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|
298 |
} else { |
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|
299 |
remove = true; |
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|
300 |
} |
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|
301 |
} |
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|
302 |
if (remove) { |
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|
303 |
return list.toArray(new Runnable[list.size()]); |
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|
304 |
} |
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|
305 |
return null; |
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|
306 |
} |
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|
307 |
|
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|
308 |
private static Runnable[] addAction(Runnable[] array, Runnable action) { |
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|
309 |
ArrayList<Runnable> a = new ArrayList<>(); |
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|
310 |
a.addAll(Arrays.asList(array)); |
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|
311 |
a.add(action); |
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|
312 |
return a.toArray(new Runnable[0]); |
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|
313 |
} |
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|
314 |
|
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|
315 |
} |