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