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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 java.io.IOException;
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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.Utils;
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public final class ChunkHeader {
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private static final long HEADER_SIZE = 68;
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private static final byte UPDATING_CHUNK_HEADER = (byte) 255;
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private static final long CHUNK_SIZE_POSITION = 8;
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private static final long DURATION_NANOS_POSITION = 40;
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private static final long FILE_STATE_POSITION = 64;
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private static final long METADATA_TYPE_ID = 0;
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private static final byte[] FILE_MAGIC = { 'F', 'L', 'R', '\0' };
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private final short major;
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private final short minor;
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private final long chunkStartTicks;
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private final long ticksPerSecond;
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private final long chunkStartNanos;
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private final long absoluteChunkStart;
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private final RecordingInput input;
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private final long id;
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private long absoluteEventStart;
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private long chunkSize = 0;
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private long constantPoolPosition = 0;
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private long metadataPosition = 0;
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private long durationNanos;
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private long absoluteChunkEnd;
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private boolean isFinished;
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private boolean finished;
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public ChunkHeader(RecordingInput input) throws IOException {
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this(input, 0, 0);
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}
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private ChunkHeader(RecordingInput input, long absoluteChunkStart, long id) throws IOException {
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this.absoluteChunkStart = absoluteChunkStart;
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this.absoluteEventStart = absoluteChunkStart + HEADER_SIZE;
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if (input.getFileSize() < HEADER_SIZE) {
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throw new IOException("Not a complete Chunk header");
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}
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input.setValidSize(absoluteChunkStart + HEADER_SIZE);
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input.position(absoluteChunkStart);
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if (input.position() >= input.size()) {
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throw new IOException("Chunk contains no data");
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}
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verifyMagic(input);
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this.input = input;
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this.id = id;
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: " + id);
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: file=" + input.getFilename());
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: startPosition=" + absoluteChunkStart);
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major = input.readRawShort();
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: major=" + major);
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minor = input.readRawShort();
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: minor=" + minor);
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if (major != 1 && major != 2) {
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throw new IOException("File version " + major + "." + minor + ". Only Flight Recorder files of version 1.x and 2.x can be read by this JDK.");
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}
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input.readRawLong(); // chunk size
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: chunkSize=" + chunkSize);
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input.readRawLong(); // constant pool position
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: constantPoolPosition=" + constantPoolPosition);
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input.readRawLong(); // metadata position
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: metadataPosition=" + metadataPosition);
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chunkStartNanos = input.readRawLong(); // nanos since epoch
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: startNanos=" + chunkStartNanos);
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durationNanos = input.readRawLong(); // duration nanos, not used
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: durationNanos=" + durationNanos);
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chunkStartTicks = input.readRawLong();
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: startTicks=" + chunkStartTicks);
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ticksPerSecond = input.readRawLong();
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: ticksPerSecond=" + ticksPerSecond);
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input.readRawInt(); // features, not used
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refresh();
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input.position(absoluteEventStart);
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}
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void refresh() throws IOException {
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while (true) {
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byte fileState1;
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input.positionPhysical(absoluteChunkStart + FILE_STATE_POSITION);
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while ((fileState1 = input.readPhysicalByte()) == UPDATING_CHUNK_HEADER) {
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Utils.takeNap(1);
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input.positionPhysical(absoluteChunkStart + FILE_STATE_POSITION);
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}
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input.positionPhysical(absoluteChunkStart + CHUNK_SIZE_POSITION);
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long chunkSize = input.readPhysicalLong();
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long constantPoolPosition = input.readPhysicalLong();
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long metadataPosition = input.readPhysicalLong();
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input.positionPhysical(absoluteChunkStart + DURATION_NANOS_POSITION);
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long durationNanos = input.readPhysicalLong();
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input.positionPhysical(absoluteChunkStart + FILE_STATE_POSITION);
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byte fileState2 = input.readPhysicalByte();
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if (fileState1 == fileState2) { // valid header
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finished = fileState1 == 0;
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if (metadataPosition != 0) {
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Setting input size to " + (absoluteChunkStart + chunkSize));
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if (finished) {
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// This assumes that the whole recording
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// is finished if the first chunk is.
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// This is a limitation we may want to
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// remove, but greatly improves performance as
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// data can be read across chunk boundaries
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// of multi-chunk files and only once.
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input.setValidSize(input.getFileSize());
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} else {
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input.setValidSize(absoluteChunkStart + chunkSize);
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}
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this.chunkSize = chunkSize;
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: chunkSize=" + chunkSize);
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this.constantPoolPosition = constantPoolPosition;
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: constantPoolPosition=" + constantPoolPosition);
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this.metadataPosition = metadataPosition;
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: metadataPosition=" + metadataPosition);
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this.durationNanos = durationNanos;
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: durationNanos =" + durationNanos);
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isFinished = fileState2 == 0;
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: generation=" + fileState2);
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: finished=" + isFinished);
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Chunk: fileSize=" + input.size());
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absoluteChunkEnd = absoluteChunkStart + chunkSize;
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return;
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}
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}
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}
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}
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public void awaitFinished() throws IOException {
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if (finished) {
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return;
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}
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long pos = input.position();
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try {
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input.positionPhysical(absoluteChunkStart + FILE_STATE_POSITION);
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while (true) {
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byte filestate = input.readPhysicalByte();
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if (filestate == 0) {
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finished = true;
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return;
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}
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Utils.takeNap(1);
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}
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} finally {
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input.position(pos);
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}
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}
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public boolean isLastChunk() throws IOException {
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awaitFinished();
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// streaming files only have one chunk
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return input.getFileSize() == absoluteChunkEnd;
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}
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public boolean isFinished() throws IOException {
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return isFinished;
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}
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public ChunkHeader nextHeader() throws IOException {
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return new ChunkHeader(input, absoluteChunkEnd, id + 1);
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}
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public MetadataDescriptor readMetadata() throws IOException {
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return readMetadata(null);
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}
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public MetadataDescriptor readMetadata(MetadataDescriptor previous) throws IOException {
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input.position(absoluteChunkStart + metadataPosition);
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input.readInt(); // size
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long id = input.readLong(); // event type id
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if (id != METADATA_TYPE_ID) {
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throw new IOException("Expected metadata event. Type id=" + id + ", should have been " + METADATA_TYPE_ID);
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}
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input.readLong(); // start time
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input.readLong(); // duration
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long metadataId = input.readLong();
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if (previous != null && metadataId == previous.metadataId) {
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return previous;
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}
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.TRACE, "New metadata id = " + metadataId);
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MetadataDescriptor m = MetadataDescriptor.read(input);
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m.metadataId = metadataId;
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return m;
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}
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public short getMajor() {
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return major;
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}
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public short getMinor() {
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return minor;
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}
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public long getAbsoluteChunkStart() {
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return absoluteChunkStart;
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}
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public long getAbsoluteEventStart() {
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return absoluteEventStart;
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}
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public long getConstantPoolPosition() {
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return constantPoolPosition;
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}
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public long getMetataPosition() {
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return metadataPosition;
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}
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public long getStartTicks() {
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return chunkStartTicks;
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}
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public long getChunkSize() {
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return chunkSize;
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}
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public double getTicksPerSecond() {
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return ticksPerSecond;
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}
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public long getStartNanos() {
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return chunkStartNanos;
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}
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public long getEnd() {
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return absoluteChunkEnd;
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}
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public long getSize() {
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return chunkSize;
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}
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public long getDurationNanos() {
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return durationNanos;
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}
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public RecordingInput getInput() {
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return input;
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}
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private static void verifyMagic(RecordingInput input) throws IOException {
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for (byte c : FILE_MAGIC) {
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if (input.readByte() != c) {
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throw new IOException("Not a Flight Recorder file");
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}
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}
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}
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public long getEventStart() {
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return absoluteEventStart;
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}
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static long headerSize() {
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return HEADER_SIZE;
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}
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}
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