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/*
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* Copyright (c) 2016, 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 static jdk.jfr.internal.EventInstrumentation.FIELD_DURATION;
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import java.io.IOException;
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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.consumer.RecordedEvent;
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import jdk.jfr.internal.consumer.Parser;
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import jdk.jfr.internal.consumer.RecordingInput;
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/**
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* Parses an event and returns a {@link RecordedEvent}.
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*
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*/
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final class EventParser extends Parser {
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private static final JdkJfrConsumer PRIVATE_ACCESS = JdkJfrConsumer.instance();
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private final Parser[] parsers;
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private final EventType eventType;
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private final TimeConverter timeConverter;
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private final boolean hasDuration;
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private final List<ValueDescriptor> valueDescriptors;
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private final int startIndex;
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private final int length;
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private final RecordedEvent unorderedEvent;
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private final ObjectContext objectContext;
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private RecordedEvent[] cached;
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private int cacheIndex;
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private boolean enabled = true;
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private boolean ordered;
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private long filterStart;
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private long filterEnd = Long.MAX_VALUE;
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private long thresholdNanos = -1;
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EventParser(TimeConverter timeConverter, EventType type, Parser[] parsers) {
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this.timeConverter = timeConverter;
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this.parsers = parsers;
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this.eventType = type;
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this.hasDuration = type.getField(FIELD_DURATION) != null;
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this.startIndex = hasDuration ? 2 : 1;
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this.length = parsers.length - startIndex;
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this.valueDescriptors = type.getFields();
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this.objectContext = new ObjectContext(type, valueDescriptors, timeConverter);
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this.unorderedEvent = PRIVATE_ACCESS.newRecordedEvent(objectContext, new Object[length], 0L, 0L);
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}
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private RecordedEvent cachedEvent() {
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if (ordered) {
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if (cacheIndex == cached.length) {
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RecordedEvent[] old = cached;
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cached = new RecordedEvent[cached.length * 2];
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System.arraycopy(old, 0, cached, 0, old.length);
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}
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RecordedEvent event = cached[cacheIndex];
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if (event == null) {
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event = PRIVATE_ACCESS.newRecordedEvent(objectContext, new Object[length], 0L, 0L);
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cached[cacheIndex] = event;
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}
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cacheIndex++;
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return event;
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} else {
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return unorderedEvent;
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}
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}
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public EventType getEventType() {
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return eventType;
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}
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public void setThresholdNanos(long thresholdNanos) {
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this.thresholdNanos = thresholdNanos;
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}
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public void setEnabled(boolean enabled) {
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this.enabled = enabled;
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}
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public boolean isEnabled() {
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return enabled;
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}
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public RecordedEvent parse(RecordingInput input) throws IOException {
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if (!enabled) {
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return null;
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}
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long startTicks = input.readLong();
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long endTicks = startTicks;
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if (hasDuration) {
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long durationTicks = input.readLong();
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if (thresholdNanos > 0L) {
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if (timeConverter.convertTimespan(durationTicks) < thresholdNanos) {
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return null;
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}
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}
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endTicks += durationTicks;
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}
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if (filterStart != 0L || filterEnd != Long.MAX_VALUE) {
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long eventEnd = timeConverter.convertTimestamp(endTicks);
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if (eventEnd < filterStart) {
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return null;
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}
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if (eventEnd > filterEnd) {
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return null;
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}
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}
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if (cached != null) {
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RecordedEvent event = cachedEvent();
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JdkJfrConsumer access = PRIVATE_ACCESS;
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access.setStartTicks(event, startTicks);
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access.setEndTicks(event, endTicks);
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Object[] values = access.eventValues(event);
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for (int i = 0; i < values.length; i++) {
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values[i] = parsers[startIndex + i].parse(input);
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}
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return event;
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}
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Object[] values = new Object[length];
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for (int i = 0; i < values.length; i++) {
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values[i] = parsers[startIndex + i].parse(input);
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}
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return PRIVATE_ACCESS.newRecordedEvent(objectContext, values, startTicks, endTicks);
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}
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@Override
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public void skip(RecordingInput input) throws IOException {
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throw new InternalError("Should not call this method. More efficent to read event size and skip ahead");
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}
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public void resetCache() {
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cacheIndex = 0;
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}
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private boolean hasReuse() {
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return cached != null;
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}
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public void setReuse(boolean reuse) {
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if (reuse == hasReuse()) {
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return;
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}
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if (reuse) {
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cached = new RecordedEvent[2];
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cacheIndex = 0;
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} else {
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cached = null;
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}
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}
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public void setFilterStart(long filterStart) {
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this.filterStart = filterStart;
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}
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public void setFilterEnd(long filterEnd) {
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this.filterEnd = filterEnd;
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}
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public void setOrdered(boolean ordered) {
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if (this.ordered == ordered) {
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return;
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}
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this.ordered = ordered;
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this.cacheIndex = 0;
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}
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}
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