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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.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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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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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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if (e.endTime < startNanos) {
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return;
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}
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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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public void setReuse(boolean reuse) {
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reuseHandle.setVolatile(this, reuse);
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}
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public void setOrdered(boolean ordered) {
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orderedHandle.setVolatile(this, ordered);
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}
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public void setStartTime(Instant startTime) {
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Objects.nonNull(startTime);
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if (started) {
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throw new IllegalStateException("Stream is already started");
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}
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if (startTime.isBefore(Instant.EPOCH)) {
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startTime = Instant.EPOCH;
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}
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startTimeHandle.setVolatile(this, startTime);
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}
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} |