src/jdk.jfr/share/classes/jdk/jfr/consumer/RecordedEvent.java
author egahlin
Mon, 08 Jul 2019 23:08:05 +0200
branchJEP-349-branch
changeset 57460 bcbc53560c77
parent 57452 6fabe73e5d9a
child 58112 e7754025004b
permissions -rw-r--r--
Reduce allocation rate by minimizing number of fields in RecordedEvent
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/*
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 * Copyright (c) 2016, 2018, 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.time.Duration;
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import java.time.Instant;
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import java.util.List;
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import jdk.jfr.EventType;
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import jdk.jfr.ValueDescriptor;
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import jdk.jfr.internal.EventInstrumentation;
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/**
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 * A recorded event.
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 *
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 * @since 9
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 */
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public final class RecordedEvent extends RecordedObject {
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    long startTimeTicks;
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    long endTimeTicks;
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    // package private
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    RecordedEvent(ObjectContext objectContext, Object[] values, long startTimeTicks, long endTimeTicks) {
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        super(objectContext, values);
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        this.startTimeTicks = startTimeTicks;
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        this.endTimeTicks = endTimeTicks;
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    }
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    /**
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     * Returns the stack trace that was created when the event was committed, or
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     * {@code null} if the event lacks a stack trace.
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     *
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     * @return stack trace, or {@code null} if doesn't exist for the event
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     */
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    public RecordedStackTrace getStackTrace() {
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        return getTyped(EventInstrumentation.FIELD_STACK_TRACE, RecordedStackTrace.class, null);
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    }
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    /**
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     * Returns the thread from which the event was committed, or {@code null} if
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     * the thread was not recorded.
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     *
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     * @return thread, or {@code null} if doesn't exist for the event
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     */
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    public RecordedThread getThread() {
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        return getTyped(EventInstrumentation.FIELD_EVENT_THREAD, RecordedThread.class, null);
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    }
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    /**
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     * Returns the event type that describes the event.
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     *
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     * @return the event type, not {@code null}
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     */
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    public EventType getEventType() {
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        return objectContext.eventType;
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    }
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    /**
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     * Returns the start time of the event.
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     * <p>
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     * If the event is an instant event, then the start time and end time are the same.
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     *
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     * @return the start time, not {@code null}
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     */
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    public Instant getStartTime() {
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        return Instant.ofEpochSecond(0, getStartTimeNanos());
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    }
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    /**
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     * Returns the end time of the event.
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     * <p>
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     * If the event is an instant event, then the start time and end time are the same.
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     *
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     * @return the end time, not {@code null}
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     */
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    public Instant getEndTime() {
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        return Instant.ofEpochSecond(0, getEndTimeNanos());
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    }
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    /**
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     * Returns the duration of the event, measured in nanoseconds.
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     *
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     * @return the duration in nanoseconds, not {@code null}
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     */
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    public Duration getDuration() {
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        return Duration.ofNanos(getEndTimeNanos() - getStartTimeNanos());
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    }
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    /**
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     * Returns the list of descriptors that describes the fields of the event.
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     *
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     * @return descriptors, not {@code null}
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     */
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    @Override
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    public List<ValueDescriptor> getFields() {
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        return objectContext.fields;
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    }
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    protected final Object objectAt(int index) {
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        if (index == 0) {
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            return startTimeTicks;
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        }
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        if (hasDuration()) {
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            if (index == 1) {
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                return endTimeTicks - startTimeTicks;
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            }
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            return objects[index - 2];
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        }
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        return objects[index - 1];
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    }
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    private boolean hasDuration() {
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        return objects.length + 2 == objectContext.fields.size();
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    }
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    private long getStartTimeNanos() {
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        return objectContext.timeConverter.convertTimestamp(startTimeTicks);
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    }
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    private long getEndTimeNanos() {
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        return objectContext.timeConverter.convertTimestamp(endTimeTicks);
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    }
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}