--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/Repository.java Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2012, 2018, 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;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.HashSet;
+import java.util.Set;
+
+import jdk.jfr.internal.SecuritySupport.SafePath;
+
+public final class Repository {
+
+ private static final int MAX_REPO_CREATION_RETRIES = 1000;
+ private static final JVM jvm = JVM.getJVM();
+ private static final Repository instance = new Repository();
+
+ static DateTimeFormatter REPO_DATE_FORMAT = DateTimeFormatter
+ .ofPattern("yyyy_MM_dd_HH_mm_ss");
+
+ private final Set<SafePath> cleanupDirectories = new HashSet<>();
+ private SafePath baseLocation;
+ private SafePath repository;
+
+ private Repository() {
+ }
+
+ public static Repository getRepository() {
+ return instance;
+ }
+
+ public synchronized void setBasePath(SafePath baseLocation) throws Exception {
+ // Probe to see if repository can be created, needed for fail fast
+ // during JVM startup or JFR.configure
+ this.repository = createRepository(baseLocation);
+ try {
+ // Remove so we don't "leak" repositories, if JFR is never started
+ // and shutdown hook not added.
+ SecuritySupport.delete(repository);
+ } catch (IOException ioe) {
+ Logger.log(LogTag.JFR, LogLevel.INFO, "Could not delete disk repository " + repository);
+ }
+ this.baseLocation = baseLocation;
+ }
+
+ synchronized void ensureRepository() throws Exception {
+ if (baseLocation == null) {
+ setBasePath(SecuritySupport.JAVA_IO_TMPDIR);
+ }
+ }
+
+ synchronized RepositoryChunk newChunk(Instant timestamp) {
+ try {
+ if (!SecuritySupport.existDirectory(repository)) {
+ this.repository = createRepository(baseLocation);
+ jvm.setRepositoryLocation(repository.toString());
+ cleanupDirectories.add(repository);
+ }
+ return new RepositoryChunk(repository, timestamp);
+ } catch (Exception e) {
+ String errorMsg = String.format("Could not create chunk in repository %s, %s", repository, e.getMessage());
+ Logger.log(LogTag.JFR, LogLevel.ERROR, errorMsg);
+ jvm.abort(errorMsg);
+ throw new InternalError("Could not abort after JFR disk creation error");
+ }
+ }
+
+ private static SafePath createRepository(SafePath basePath) throws Exception {
+ SafePath canonicalBaseRepositoryPath = createRealBasePath(basePath);
+ SafePath f = null;
+
+ String basename = REPO_DATE_FORMAT.format(LocalDateTime.now()) + "_" + JVM.getJVM().getPid();
+ String name = basename;
+
+ int i = 0;
+ for (; i < MAX_REPO_CREATION_RETRIES; i++) {
+ f = new SafePath(canonicalBaseRepositoryPath.toPath().resolve(name));
+ if (tryToUseAsRepository(f)) {
+ break;
+ }
+ name = basename + "_" + i;
+ }
+
+ if (i == MAX_REPO_CREATION_RETRIES) {
+ throw new Exception("Unable to create JFR repository directory using base location (" + basePath + ")");
+ }
+ SafePath canonicalRepositoryPath = SecuritySupport.toRealPath(f);
+ return canonicalRepositoryPath;
+ }
+
+ private static SafePath createRealBasePath(SafePath safePath) throws Exception {
+ if (SecuritySupport.exists(safePath)) {
+ if (!SecuritySupport.isWritable(safePath)) {
+ throw new IOException("JFR repository directory (" + safePath.toString() + ") exists, but isn't writable");
+ }
+ return SecuritySupport.toRealPath(safePath);
+ }
+ SafePath p = SecuritySupport.createDirectories(safePath);
+ return SecuritySupport.toRealPath(p);
+ }
+
+ private static boolean tryToUseAsRepository(final SafePath path) {
+ Path parent = path.toPath().getParent();
+ if (parent == null) {
+ return false;
+ }
+ try {
+ try {
+ SecuritySupport.createDirectories(path);
+ } catch (Exception e) {
+ // file already existed or some other problem occurred
+ }
+ if (!SecuritySupport.exists(path)) {
+ return false;
+ }
+ if (!SecuritySupport.isDirectory(path)) {
+ return false;
+ }
+ return true;
+ } catch (IOException io) {
+ return false;
+ }
+ }
+
+ synchronized void clear() {
+ for (SafePath p : cleanupDirectories) {
+ try {
+ SecuritySupport.clearDirectory(p);
+ Logger.log(LogTag.JFR, LogLevel.INFO, "Removed repository " + p);
+ } catch (IOException e) {
+ Logger.log(LogTag.JFR, LogLevel.ERROR, "Repository " + p + " could not be removed at shutdown: " + e.getMessage());
+ }
+ }
+ }
+
+ public synchronized SafePath getRepositoryPath() {
+ return repository;
+ }
+}