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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package jdk.jfr.consumer;
import java.io.IOException;
import java.nio.file.Path;
import java.security.AccessControlContext;
import java.time.Instant;
import java.util.Arrays;
import java.util.Objects;
import jdk.jfr.internal.Utils;
import jdk.jfr.internal.consumer.FileAccess;
import jdk.jfr.internal.consumer.RecordingInput;
import jdk.jfr.internal.consumer.RepositoryFiles;
/**
* Implementation of an {@code EventStream}} that operates against a directory
* with chunk files.
*
*/
final class EventDirectoryStream extends AbstractEventStream {
private final RepositoryFiles repositoryFiles;
private final boolean active;
private final FileAccess fileAccess;
private ChunkParser chunkParser;
private long chunkStartNanos;
private RecordedEvent[] sortedList;
public EventDirectoryStream(AccessControlContext acc, Path p, FileAccess fileAccess, boolean active) throws IOException {
super(acc, active);
this.fileAccess = Objects.requireNonNull(fileAccess);
this.active = active;
this.repositoryFiles = new RepositoryFiles(fileAccess, p);
}
@Override
public void close() {
setClosed(true);
runCloseActions();
repositoryFiles.close();
}
@Override
public void start() {
start(Utils.timeToNanos(Instant.now()));
}
@Override
public void startAsync() {
startAsync(Utils.timeToNanos(Instant.now()));
}
@Override
public void process() throws Exception {
StreamConfiguration c = configuration;
Path path;
boolean validStartTime = active || c.getStartTime() != null;
if (validStartTime) {
path = repositoryFiles.firstPath(c.getStartNanos());
} else {
path = repositoryFiles.lastPath();
}
if (path == null) { // closed
return;
}
chunkStartNanos = repositoryFiles.getTimestamp(path);
try (RecordingInput input = new RecordingInput(path.toFile(), fileAccess)) {
chunkParser = new ChunkParser(input, c.getReuse());
long segmentStart = chunkParser.getStartNanos() + chunkParser.getChunkDuration();
long filtertStart = validStartTime ? c.getStartNanos() : segmentStart;
long filterEnd = c.getEndTime() != null ? c.getEndNanos() : Long.MAX_VALUE;
while (!isClosed()) {
boolean awaitnewEvent = false;
while (!isClosed() && !chunkParser.isChunkFinished()) {
c = configuration;
boolean ordered = c.getOrdered();
chunkParser.setFlushOperation(getFlushOperation());
chunkParser.setReuse(c.getReuse());
chunkParser.setOrdered(ordered);
chunkParser.setFilterStart(filtertStart);
chunkParser.setFilterEnd(filterEnd);
chunkParser.resetEventCache();
chunkParser.setParserFilter(c.getFilter());
chunkParser.updateEventParsers();
clearLastDispatch();
if (ordered) {
awaitnewEvent = processOrdered(awaitnewEvent);
} else {
awaitnewEvent = processUnordered(awaitnewEvent);
}
if (chunkParser.getStartNanos() + chunkParser.getChunkDuration() > filterEnd) {
close();
return;
}
}
if (isClosed()) {
return;
}
long durationNanos = chunkParser.getChunkDuration();
path = repositoryFiles.nextPath(chunkStartNanos + durationNanos);
if (path == null) {
return; // stream closed
}
chunkStartNanos = repositoryFiles.getTimestamp(path);
input.setFile(path);
chunkParser = chunkParser.newChunkParser();
// TODO: Optimization. No need filter when we reach new chunk
// Could set start = 0;
}
}
}
private boolean processOrdered(boolean awaitNewEvents) throws IOException {
if (sortedList == null) {
sortedList = new RecordedEvent[100_000];
}
int index = 0;
while (true) {
RecordedEvent e = chunkParser.readStreamingEvent(awaitNewEvents);
if (e == null) {
// wait for new event with next call to
// readStreamingEvent()
awaitNewEvents = true;
break;
}
awaitNewEvents = false;
if (index == sortedList.length) {
sortedList = Arrays.copyOf(sortedList, sortedList.length * 2);
}
sortedList[index++] = e;
}
// no events found
if (index == 0 && chunkParser.isChunkFinished()) {
return awaitNewEvents;
}
// at least 2 events, sort them
if (index > 1) {
Arrays.sort(sortedList, 0, index, END_TIME);
}
for (int i = 0; i < index; i++) {
dispatch(sortedList[i]);
}
return awaitNewEvents;
}
private boolean processUnordered(boolean awaitNewEvents) throws IOException {
while (true) {
RecordedEvent e = chunkParser.readStreamingEvent(awaitNewEvents);
if (e == null) {
return true;
} else {
dispatch(e);
}
}
}
}