--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/EventDirectoryStream.java Wed Oct 30 19:43:52 2019 +0100
@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * 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
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.internal.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.Comparator;
+import java.util.Objects;
+
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.jfr.internal.JVM;
+import jdk.jfr.internal.Utils;
+import jdk.jfr.internal.consumer.ChunkParser.ParserConfiguration;
+
+/**
+ * Implementation of an {@code EventStream}} that operates against a directory
+ * with chunk files.
+ *
+ */
+public final class EventDirectoryStream extends AbstractEventStream {
+
+ private final static Comparator<? super RecordedEvent> EVENT_COMPARATOR = JdkJfrConsumer.instance().eventComparator();
+
+ private final RepositoryFiles repositoryFiles;
+ private final boolean active;
+ private final FileAccess fileAccess;
+
+ private ChunkParser currentParser;
+ private long currentChunkStartNanos;
+ private RecordedEvent[] sortedCache;
+ private int threadExclusionLevel = 0;
+
+ 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);
+ dispatcher().runCloseActions();
+ repositoryFiles.close();
+ }
+
+ @Override
+ public void start() {
+ start(Utils.timeToNanos(Instant.now()));
+ }
+
+ @Override
+ public void startAsync() {
+ startAsync(Utils.timeToNanos(Instant.now()));
+ }
+
+ @Override
+ protected void process() throws IOException {
+ JVM jvm = JVM.getJVM();
+ Thread t = Thread.currentThread();
+ try {
+ if (jvm.isExcluded(t)) {
+ threadExclusionLevel++;
+ } else {
+ jvm.exclude(t);
+ }
+ processRecursionSafe();
+ } finally {
+ if (threadExclusionLevel > 0) {
+ threadExclusionLevel--;
+ } else {
+ jvm.include(t);
+ }
+ }
+ }
+
+ protected void processRecursionSafe() throws IOException {
+ Dispatcher disp = dispatcher();
+
+ Path path;
+ boolean validStartTime = active || disp.startTime != null;
+ if (validStartTime) {
+ path = repositoryFiles.firstPath(disp.startNanos);
+ } else {
+ path = repositoryFiles.lastPath();
+ }
+ if (path == null) { // closed
+ return;
+ }
+ currentChunkStartNanos = repositoryFiles.getTimestamp(path);
+ try (RecordingInput input = new RecordingInput(path.toFile(), fileAccess)) {
+ currentParser = new ChunkParser(input, disp.parserConfiguration);
+ long segmentStart = currentParser.getStartNanos() + currentParser.getChunkDuration();
+ long filterStart = validStartTime ? disp.startNanos : segmentStart;
+ long filterEnd = disp.endTime != null ? disp.endNanos: Long.MAX_VALUE;
+
+ while (!isClosed()) {
+ boolean awaitnewEvent = false;
+ while (!isClosed() && !currentParser.isChunkFinished()) {
+ disp = dispatcher();
+ ParserConfiguration pc = disp.parserConfiguration;
+ pc.filterStart = filterStart;
+ pc.filterEnd = filterEnd;
+ currentParser.updateConfiguration(pc, true);
+ currentParser.setFlushOperation(getFlushOperation());
+ if (pc.isOrdered()) {
+ awaitnewEvent = processOrdered(disp, awaitnewEvent);
+ } else {
+ awaitnewEvent = processUnordered(disp, awaitnewEvent);
+ }
+ if (currentParser.getStartNanos() + currentParser.getChunkDuration() > filterEnd) {
+ close();
+ return;
+ }
+ }
+
+ if (isClosed()) {
+ return;
+ }
+ long durationNanos = currentParser.getChunkDuration();
+ if (durationNanos == 0) {
+ // Avoid reading the same chunk again and again if
+ // duration is 0 ns
+ durationNanos++;
+ }
+ path = repositoryFiles.nextPath(currentChunkStartNanos + durationNanos);
+ if (path == null) {
+ return; // stream closed
+ }
+ currentChunkStartNanos = repositoryFiles.getTimestamp(path);
+ input.setFile(path);
+ currentParser = currentParser.newChunkParser();
+ // TODO: Optimization. No need filter when we reach new chunk
+ // Could set start = 0;
+ }
+ }
+ }
+
+ private boolean processOrdered(Dispatcher c, boolean awaitNewEvents) throws IOException {
+ if (sortedCache == null) {
+ sortedCache = new RecordedEvent[100_000];
+ }
+ int index = 0;
+ while (true) {
+ RecordedEvent e = currentParser.readStreamingEvent(awaitNewEvents);
+ if (e == null) {
+ // wait for new event with next call to
+ // readStreamingEvent()
+ awaitNewEvents = true;
+ break;
+ }
+ awaitNewEvents = false;
+ if (index == sortedCache.length) {
+ sortedCache = Arrays.copyOf(sortedCache, sortedCache.length * 2);
+ }
+ sortedCache[index++] = e;
+ }
+
+ // no events found
+ if (index == 0 && currentParser.isChunkFinished()) {
+ return awaitNewEvents;
+ }
+ // at least 2 events, sort them
+ if (index > 1) {
+ Arrays.sort(sortedCache, 0, index, EVENT_COMPARATOR);
+ }
+ for (int i = 0; i < index; i++) {
+ c.dispatch(sortedCache[i]);
+ }
+ return awaitNewEvents;
+ }
+
+ private boolean processUnordered(Dispatcher c, boolean awaitNewEvents) throws IOException {
+ while (true) {
+ RecordedEvent e = currentParser.readStreamingEvent(awaitNewEvents);
+ if (e == null) {
+ return true;
+ } else {
+ c.dispatch(e);
+ }
+ }
+ }
+}