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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.io.IOException;
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import java.util.Collection;
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import java.util.List;
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import jdk.jfr.EventType;
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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.MetadataDescriptor;
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import jdk.jfr.internal.Type;
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import jdk.jfr.internal.consumer.ChunkHeader;
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import jdk.jfr.internal.consumer.RecordingInput;
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/**
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* Parses a chunk.
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*
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*/
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final class ChunkParser {
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private static final long CONSTANT_POOL_TYPE_ID = 1;
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private final RecordingInput input;
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private final LongMap<Parser> parsers;
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private final ChunkHeader chunkHeader;
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private final long absoluteChunkEnd;
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private final MetadataDescriptor metadata;
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private final LongMap<Type> typeMap;
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private final TimeConverter timeConverter;
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public ChunkParser(RecordingInput input) throws IOException {
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this(new ChunkHeader(input));
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}
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private ChunkParser(ChunkHeader header) throws IOException {
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this.input = header.getInput();
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this.chunkHeader = header;
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this.metadata = header.readMetadata();
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this.absoluteChunkEnd = header.getEnd();
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this.timeConverter = new TimeConverter(chunkHeader, metadata.getGMTOffset());
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ParserFactory factory = new ParserFactory(metadata, timeConverter);
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LongMap<ConstantMap> constantPools = factory.getConstantPools();
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parsers = factory.getParsers();
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typeMap = factory.getTypeMap();
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fillConstantPools(parsers, constantPools);
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constantPools.forEach(ConstantMap::setIsResolving);
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constantPools.forEach(ConstantMap::resolve);
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constantPools.forEach(ConstantMap::setResolved);
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input.position(chunkHeader.getEventStart());
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}
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public RecordedEvent readEvent() throws IOException {
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while (input.position() < absoluteChunkEnd) {
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long pos = input.position();
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int size = input.readInt();
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if (size == 0) {
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throw new IOException("Event can't have zero size");
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}
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long typeId = input.readLong();
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if (typeId > CONSTANT_POOL_TYPE_ID) { // also skips metadata (id=0)
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Parser ep = parsers.get(typeId);
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if (ep instanceof EventParser) {
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return (RecordedEvent) ep.parse(input);
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}
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}
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input.position(pos + size);
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}
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return null;
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}
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private void fillConstantPools(LongMap<Parser> typeParser, LongMap<ConstantMap> constantPools) throws IOException {
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long nextCP = chunkHeader.getAbsoluteChunkStart();
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long deltaToNext = chunkHeader.getConstantPoolPosition();
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while (deltaToNext != 0) {
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nextCP += deltaToNext;
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input.position(nextCP);
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final long position = nextCP;
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int size = input.readInt(); // size
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long typeId = input.readLong();
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if (typeId != CONSTANT_POOL_TYPE_ID) {
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throw new IOException("Expected check point event (id = 1) at position " + nextCP + ", but found type id = " + typeId);
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}
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input.readLong(); // timestamp
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input.readLong(); // duration
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deltaToNext = input.readLong();
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final long delta = deltaToNext;
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boolean flush = input.readBoolean();
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int poolCount = input.readInt();
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.TRACE, () -> {
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return "New constant pool: startPosition=" + position + ", size=" + size + ", deltaToNext=" + delta + ", flush=" + flush + ", poolCount=" + poolCount;
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});
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for (int i = 0; i < poolCount; i++) {
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long id = input.readLong(); // type id
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ConstantMap pool = constantPools.get(id);
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Type type = typeMap.get(id);
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if (pool == null) {
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Found constant pool(" + id + ") that is never used");
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if (type == null) {
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throw new IOException("Error parsing constant pool type " + getName(id) + " at position " + input.position() + " at check point between [" + nextCP + ", " + nextCP + size + "]");
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}
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pool = new ConstantMap(ObjectFactory.create(type, timeConverter), type.getName());
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constantPools.put(type.getId(), pool);
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}
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Parser parser = typeParser.get(id);
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if (parser == null) {
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throw new IOException("Could not find constant pool type with id = " + id);
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}
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try {
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int count = input.readInt();
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.TRACE, () -> "Constant: " + getName(id) + "[" + count + "]");
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for (int j = 0; j < count; j++) {
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long key = input.readLong();
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Object value = parser.parse(input);
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pool.put(key, value);
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}
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} catch (Exception e) {
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throw new IOException("Error parsing constant pool type " + getName(id) + " at position " + input.position() + " at check point between [" + nextCP + ", " + nextCP + size + "]", e);
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}
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}
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if (input.position() != nextCP + size) {
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throw new IOException("Size of check point event doesn't match content");
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}
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}
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}
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private String getName(long id) {
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Type type = typeMap.get(id);
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return type == null ? ("unknown(" + id + ")") : type.getName();
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}
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public Collection<Type> getTypes() {
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return metadata.getTypes();
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}
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public List<EventType> getEventTypes() {
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return metadata.getEventTypes();
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}
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public boolean isLastChunk() {
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return chunkHeader.isLastChunk();
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}
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public ChunkParser nextChunkParser() throws IOException {
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return new ChunkParser(chunkHeader.nextHeader());
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}
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}
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