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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* particular file as subject to the "Classpath" exception as provided
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*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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*
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package jdk.jfr.internal.consumer;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.StringJoiner;
import jdk.jfr.EventType;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.consumer.RecordedObject;
import jdk.jfr.internal.LogLevel;
import jdk.jfr.internal.LogTag;
import jdk.jfr.internal.Logger;
import jdk.jfr.internal.LongMap;
import jdk.jfr.internal.MetadataDescriptor;
import jdk.jfr.internal.Type;
import jdk.jfr.internal.Utils;
/**
* Parses a chunk.
*
*/
public final class ChunkParser {
static final class ParserConfiguration {
private final boolean reuse;
private final boolean ordered;
private final ParserFilter eventFilter;
long filterStart;
long filterEnd;
ParserConfiguration(long filterStart, long filterEnd, boolean reuse, boolean ordered, ParserFilter filter) {
this.filterStart = filterStart;
this.filterEnd = filterEnd;
this.reuse = reuse;
this.ordered = ordered;
this.eventFilter = filter;
}
public ParserConfiguration() {
this(0, Long.MAX_VALUE, false, false, ParserFilter.ACCEPT_ALL);
}
public boolean isOrdered() {
return ordered;
}
}
private enum CheckPointType {
// Checkpoint that finishes a flush segment
FLUSH(1),
// Checkpoint contains chunk header information in the first pool
CHUNK_HEADER(2),
// Checkpoint contains only statics that will not change from chunk to chunk
STATICS(4),
// Checkpoint contains thread related information
THREAD(8);
private final int mask;
private CheckPointType(int mask) {
this.mask = mask;
}
private boolean is(int flags) {
return (mask & flags) != 0;
}
}
private static final long CONSTANT_POOL_TYPE_ID = 1;
private static final String CHUNKHEADER = "jdk.types.ChunkHeader";
private final RecordingInput input;
private final ChunkHeader chunkHeader;
private final MetadataDescriptor metadata;
private final TimeConverter timeConverter;
private final MetadataDescriptor previousMetadata;
private final LongMap<ConstantLookup> constantLookups;
private LongMap<Type> typeMap;
private LongMap<Parser> parsers;
private boolean chunkFinished;
private Runnable flushOperation;
private ParserConfiguration configuration;
private volatile boolean closed;
public ChunkParser(RecordingInput input) throws IOException {
this(input, new ParserConfiguration());
}
ChunkParser(RecordingInput input, ParserConfiguration pc) throws IOException {
this(new ChunkHeader(input), null, pc);
}
private ChunkParser(ChunkParser previous) throws IOException {
this(new ChunkHeader(previous.input), previous, new ParserConfiguration());
}
private ChunkParser(ChunkHeader header, ChunkParser previous, ParserConfiguration pc) throws IOException {
this.configuration = pc;
this.input = header.getInput();
this.chunkHeader = header;
if (previous == null) {
this.constantLookups = new LongMap<>();
this.previousMetadata = null;
} else {
this.constantLookups = previous.constantLookups;
this.previousMetadata = previous.metadata;
this.configuration = previous.configuration;
}
this.metadata = header.readMetadata(previousMetadata);
this.timeConverter = new TimeConverter(chunkHeader, metadata.getGMTOffset());
if (metadata != previousMetadata) {
ParserFactory factory = new ParserFactory(metadata, constantLookups, timeConverter);
parsers = factory.getParsers();
typeMap = factory.getTypeMap();
updateConfiguration();
} else {
parsers = previous.parsers;
typeMap = previous.typeMap;
}
constantLookups.forEach(c -> c.newPool());
fillConstantPools(0);
constantLookups.forEach(c -> c.getLatestPool().setResolving());
constantLookups.forEach(c -> c.getLatestPool().resolve());
constantLookups.forEach(c -> c.getLatestPool().setResolved());
input.position(chunkHeader.getEventStart());
}
public ChunkParser nextChunkParser() throws IOException {
return new ChunkParser(chunkHeader.nextHeader(), this, configuration);
}
private void updateConfiguration() {
updateConfiguration(configuration, false);
}
void updateConfiguration(ParserConfiguration configuration, boolean resetEventCache) {
this.configuration = configuration;
parsers.forEach(p -> {
if (p instanceof EventParser) {
EventParser ep = (EventParser) p;
if (resetEventCache) {
ep.resetCache();
}
String name = ep.getEventType().getName();
ep.setOrdered(configuration.ordered);
ep.setReuse(configuration.reuse);
ep.setFilterStart(configuration.filterStart);
ep.setFilterEnd(configuration.filterEnd);
long threshold = configuration.eventFilter.getThreshold(name);
if (threshold >= 0) {
ep.setEnabled(true);
ep.setThresholdNanos(threshold);
} else {
ep.setEnabled(false);
ep.setThresholdNanos(Long.MAX_VALUE);
}
}
});
}
/**
* Reads an event and returns null when segment or chunk ends.
*
* @param awaitNewEvents wait for new data.
*/
RecordedEvent readStreamingEvent() throws IOException {
long absoluteChunkEnd = chunkHeader.getEnd();
RecordedEvent event = readEvent();
if (event != null) {
return event;
}
long lastValid = absoluteChunkEnd;
long metadataPosition = chunkHeader.getMetataPosition();
long contantPosition = chunkHeader.getConstantPoolPosition();
chunkFinished = awaitUpdatedHeader(absoluteChunkEnd, configuration.filterEnd);
if (chunkFinished) {
Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "At chunk end");
return null;
}
absoluteChunkEnd = chunkHeader.getEnd();
// Read metadata and constant pools for the next segment
if (chunkHeader.getMetataPosition() != metadataPosition) {
Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Found new metadata in chunk. Rebuilding types and parsers");
MetadataDescriptor metadata = chunkHeader.readMetadata(previousMetadata);
ParserFactory factory = new ParserFactory(metadata, constantLookups, timeConverter);
parsers = factory.getParsers();
typeMap = factory.getTypeMap();
updateConfiguration();
}
if (contantPosition != chunkHeader.getConstantPoolPosition()) {
Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Found new constant pool data. Filling up pools with new values");
constantLookups.forEach(c -> c.getLatestPool().setAllResolved(false));
fillConstantPools(contantPosition + chunkHeader.getAbsoluteChunkStart());
constantLookups.forEach(c -> c.getLatestPool().setResolving());
constantLookups.forEach(c -> c.getLatestPool().resolve());
constantLookups.forEach(c -> c.getLatestPool().setResolved());
}
input.position(lastValid);
return null;
}
/**
* Reads an event and returns null when the chunk ends
*/
public RecordedEvent readEvent() throws IOException {
long absoluteChunkEnd = chunkHeader.getEnd();
while (input.position() < absoluteChunkEnd) {
long pos = input.position();
int size = input.readInt();
if (size == 0) {
throw new IOException("Event can't have zero size");
}
long typeId = input.readLong();
Parser p = parsers.get(typeId);
if (p instanceof EventParser) {
// Fast path
EventParser ep = (EventParser) p;
RecordedEvent event = ep.parse(input);
if (event != null) {
input.position(pos + size);
return event;
}
// Not accepted by filter
} else {
if (typeId == 1) { // checkpoint event
if (flushOperation != null) {
parseCheckpoint();
}
} else {
if (typeId != 0) { // Not metadata event
Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Unknown event type " + typeId);
}
}
}
input.position(pos + size);
}
return null;
}
private void parseCheckpoint() throws IOException {
// Content has been parsed previously. This
// is to trigger flush
input.readLong(); // timestamp
input.readLong(); // duration
input.readLong(); // delta
byte typeFlags = input.readByte();
if (CheckPointType.FLUSH.is(typeFlags)) {
flushOperation.run();
}
}
private boolean awaitUpdatedHeader(long absoluteChunkEnd, long filterEnd) throws IOException {
if (Logger.shouldLog(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO)) {
Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Waiting for more data (streaming). Read so far: " + chunkHeader.getChunkSize() + " bytes");
}
while (true) {
if (closed) {
return true;
}
if (chunkHeader.getLastNanos() > filterEnd) {
return true;
}
chunkHeader.refresh();
if (absoluteChunkEnd != chunkHeader.getEnd()) {
return false;
}
if (chunkHeader.isFinished()) {
return true;
}
Utils.waitFlush(1000);
}
}
private void fillConstantPools(long abortCP) throws IOException {
long thisCP = chunkHeader.getConstantPoolPosition() + chunkHeader.getAbsoluteChunkStart();
long lastCP = -1;
long delta = -1;
boolean logTrace = Logger.shouldLog(LogTag.JFR_SYSTEM_PARSER, LogLevel.TRACE);
while (thisCP != abortCP && delta != 0) {
input.position(thisCP);
lastCP = thisCP;
int size = input.readInt(); // size
long typeId = input.readLong();
if (typeId != CONSTANT_POOL_TYPE_ID) {
throw new IOException("Expected check point event (id = 1) at position " + lastCP + ", but found type id = " + typeId);
}
input.readLong(); // timestamp
input.readLong(); // duration
delta = input.readLong();
thisCP += delta;
boolean flush = input.readBoolean();
int poolCount = input.readInt();
final long logLastCP = lastCP;
final long logDelta = delta;
if (logTrace) {
Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.TRACE, () -> {
return "New constant pool: startPosition=" + logLastCP + ", size=" + size + ", deltaToNext=" + logDelta + ", flush=" + flush + ", poolCount=" + poolCount;
});
}
for (int i = 0; i < poolCount; i++) {
long id = input.readLong(); // type id
ConstantLookup lookup = constantLookups.get(id);
Type type = typeMap.get(id);
if (lookup == null) {
if (type == null) {
throw new IOException(
"Error parsing constant pool type " + getName(id) + " at position " + input.position() + " at check point between [" + lastCP + ", " + lastCP + size + "]");
}
if (type.getName() != CHUNKHEADER) {
Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Found constant pool(" + id + ") that is never used");
}
ConstantMap pool = new ConstantMap(ObjectFactory.create(type, timeConverter), type.getName());
lookup = new ConstantLookup(pool, type);
constantLookups.put(type.getId(), lookup);
}
Parser parser = parsers.get(id);
if (parser == null) {
throw new IOException("Could not find constant pool type with id = " + id);
}
try {
int count = input.readInt();
if (count == 0) {
throw new InternalError("Pool " + type.getName() + " must contain at least one element ");
}
if (logTrace) {
Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.TRACE, "Constant Pool " + i + ": " + type.getName());
}
for (int j = 0; j < count; j++) {
long key = input.readLong();
Object resolved = lookup.getPreviousResolved(key);
if (resolved == null) {
Object v = parser.parse(input);
logConstant(key, v, false);
lookup.getLatestPool().put(key, v);
} else {
parser.skip(input);
logConstant(key, resolved, true);
lookup.getLatestPool().putResolved(key, resolved);
}
}
} catch (Exception e) {
throw new IOException("Error parsing constant pool type " + getName(id) + " at position " + input.position() + " at check point between [" + lastCP + ", " + lastCP + size + "]",
e);
}
}
if (input.position() != lastCP + size) {
throw new IOException("Size of check point event doesn't match content");
}
}
}
private void logConstant(long key, Object v, boolean preresolved) {
if (!Logger.shouldLog(LogTag.JFR_SYSTEM_PARSER, LogLevel.TRACE)) {
return;
}
String valueText;
if (v.getClass().isArray()) {
Object[] array = (Object[]) v;
StringJoiner sj = new StringJoiner(", ", "{", "}");
for (int i = 0; i < array.length; i++) {
sj.add(textify(array[i]));
}
valueText = sj.toString();
} else {
valueText = textify(v);
}
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