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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.DirectoryStream;
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import java.nio.file.Path;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.NavigableMap;
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import java.util.Set;
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import java.util.SortedMap;
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import java.util.TreeMap;
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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.Repository;
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import jdk.jfr.internal.SecuritySupport.SafePath;
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public final class RepositoryFiles {
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private static final Object WAIT_OBJECT = new Object();
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public static void notifyNewFile() {
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synchronized (WAIT_OBJECT) {
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WAIT_OBJECT.notifyAll();
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}
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}
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private final FileAccess fileAccess;
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private final NavigableMap<Long, Path> pathSet = new TreeMap<>();
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private final Map<Path, Long> pathLookup = new HashMap<>();
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private final Path repository;
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private final Object waitObject;
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private volatile boolean closed;
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RepositoryFiles(FileAccess fileAccess, Path repository) {
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this.repository = repository;
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this.fileAccess = fileAccess;
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this.waitObject = repository == null ? WAIT_OBJECT : new Object();
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}
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long getTimestamp(Path p) {
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return pathLookup.get(p);
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}
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Path lastPath() {
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if (waitForPaths()) {
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return pathSet.lastEntry().getValue();
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}
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return null; // closed
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}
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Path firstPath(long startTimeNanos) {
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if (waitForPaths()) {
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// Pick closest chunk before timestamp
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Long time = pathSet.floorKey(startTimeNanos);
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if (time != null) {
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startTimeNanos = time;
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}
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return path(startTimeNanos);
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}
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return null; // closed
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}
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private boolean waitForPaths() {
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while (!closed) {
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try {
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if (updatePaths()) {
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break;
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}
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} catch (IOException e) {
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Logger.log(LogTag.JFR_SYSTEM_STREAMING, LogLevel.DEBUG, "IOException during repository file scan " + e.getMessage());
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// This can happen if a chunk is being removed
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// between the file was discovered and an instance
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// was accessed, or if new file has been written yet
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// Just ignore, and retry later.
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}
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nap();
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}
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return !closed;
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}
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Path nextPath(long startTimeNanos) {
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if (closed) {
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return null;
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}
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// Try to get the 'exact' path first
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// to avoid skipping files if repository
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// is updated while DirectoryStream
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// is traversing it
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Path path = pathSet.get(startTimeNanos);
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if (path != null) {
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return path;
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}
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// Update paths
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try {
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updatePaths();
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} catch (IOException e) {
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// ignore
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}
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// try to get the next file
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return path(startTimeNanos);
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}
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private Path path(long timestamp) {
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if (closed) {
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return null;
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}
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while (true) {
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SortedMap<Long, Path> after = pathSet.tailMap(timestamp);
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if (!after.isEmpty()) {
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Path path = after.get(after.firstKey());
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if (Logger.shouldLog(LogTag.JFR_SYSTEM_STREAMING, LogLevel.TRACE)) {
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Logger.log(LogTag.JFR_SYSTEM_STREAMING, LogLevel.TRACE, "Return path " + path + " for start time nanos " + timestamp);
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}
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return path;
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}
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if (!waitForPaths()) {
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return null; // closed
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}
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}
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}
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private void nap() {
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try {
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synchronized (waitObject) {
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waitObject.wait(1000);
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}
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} catch (InterruptedException e) {
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// ignore
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}
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}
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private boolean updatePaths() throws IOException {
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boolean foundNew = false;
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Path repoPath = repository;
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if (repoPath == null) {
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// Always get the latest repository if 'jcmd JFR.configure
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// repositorypath=...' has been executed
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SafePath sf = Repository.getRepository().getRepositoryPath();
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if (sf == null) {
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return false; // not initialized
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}
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repoPath = sf.toPath();
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}
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try (DirectoryStream<Path> dirStream = fileAccess.newDirectoryStream(repoPath)) {
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List<Path> added = new ArrayList<>();
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Set<Path> current = new HashSet<>();
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for (Path p : dirStream) {
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if (!pathLookup.containsKey(p)) {
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String s = p.toString();
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if (s.endsWith(".jfr")) {
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added.add(p);
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Logger.log(LogTag.JFR_SYSTEM_STREAMING, LogLevel.DEBUG, "New file found: " + p.toAbsolutePath());
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}
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current.add(p);
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}
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}
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List<Path> removed = new ArrayList<>();
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for (Path p : pathLookup.keySet()) {
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if (!current.contains(p)) {
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removed.add(p);
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}
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}
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for (Path remove : removed) {
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Long time = pathLookup.get(remove);
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pathSet.remove(time);
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pathLookup.remove(remove);
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}
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Collections.sort(added, (p1, p2) -> p1.compareTo(p2));
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for (Path p : added) {
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// Only add files that have a complete header
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// as the JVM may be in progress writing the file
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long size = fileAccess.fileSize(p);
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if (size >= ChunkHeader.headerSize()) {
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long startNanos = readStartTime(p);
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pathSet.put(startNanos, p);
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pathLookup.put(p, startNanos);
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foundNew = true;
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}
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}
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return foundNew;
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}
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}
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private long readStartTime(Path p) throws IOException {
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try (RecordingInput in = new RecordingInput(p.toFile(), fileAccess, 100)) {
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Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Parsing header for chunk start time");
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ChunkHeader c = new ChunkHeader(in);
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return c.getStartNanos();
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}
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}
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void close() {
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synchronized (waitObject) {
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this.closed = true;
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waitObject.notify();
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}
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}
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public boolean hasFixedPath() {
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return repository != null;
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}
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}
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