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