--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/jfc/JFC.java Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,243 @@
+/*
+ * Copyright (c) 2016, 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.jfc;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.text.ParseException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import jdk.jfr.Configuration;
+import jdk.jfr.internal.LogLevel;
+import jdk.jfr.internal.LogTag;
+import jdk.jfr.internal.Logger;
+import jdk.jfr.internal.SecuritySupport;
+import jdk.jfr.internal.SecuritySupport.SafePath;
+
+/**
+ * {@link Configuration} factory for JFC files. *
+ */
+public final class JFC {
+ private static final int BUFFER_SIZE = 8192;
+ private static final int MAXIMUM_FILE_SIZE = 1024 * 1024;
+ private static final int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 8;
+ private static volatile List<KnownConfiguration> knownConfigurations;
+
+ /**
+ * Reads a known configuration file (located into a string, but doesn't
+ * parse it until it's being used.
+ */
+ private static final class KnownConfiguration {
+ private final String content;
+ private final String filename;
+ private final String name;
+ private Configuration configuration;
+
+ public KnownConfiguration(SafePath knownPath) throws IOException {
+ this.content = readContent(knownPath);
+ this.name = nameFromPath(knownPath.toPath());
+ this.filename = nullSafeFileName(knownPath.toPath());
+ }
+
+ public boolean isNamed(String name) {
+ return filename.equals(name) || this.name.equals(name);
+ }
+
+ public Configuration getConfigurationFile() throws IOException, ParseException {
+ if (configuration == null) {
+ configuration = JFCParser.createConfiguration(name, content);
+ }
+ return configuration;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ private static String readContent(SafePath knownPath) throws IOException {
+ if (SecuritySupport.getFileSize(knownPath) > MAXIMUM_FILE_SIZE) {
+ throw new IOException("Configuration with more than "
+ + MAXIMUM_FILE_SIZE + " characters can't be read.");
+ }
+ try (InputStream r = SecuritySupport.newFileInputStream(knownPath)) {
+ return JFC.readContent(r);
+ }
+ }
+ }
+
+ private JFC() {
+ // private utility class
+ }
+
+ /**
+ * Reads a configuration from a file.
+ *
+ * @param path the file containing the configuration, not {@code null}
+ * @return {@link Configuration}, not {@code null}
+ * @throws ParseException if the file can't be parsed
+ * @throws IOException if the file can't be read
+ *
+ * @throws SecurityException if a security manager exists and its
+ * <code>checkRead</code> method denies read access to the file.
+ * @see java.io.File#getPath()
+ * @see java.lang.SecurityManager#checkRead(java.lang.String)
+ */
+ public static Configuration create(String name, Reader reader) throws IOException, ParseException {
+ return JFCParser.createConfiguration(name, reader);
+ }
+
+ private static String nullSafeFileName(Path file) throws IOException {
+ Path filename = file.getFileName();
+ if (filename == null) {
+ throw new IOException("Path has no file name");
+ }
+ return filename.toString();
+ }
+
+ public static String nameFromPath(Path file) throws IOException {
+ String f = nullSafeFileName(file);
+ return f.substring(0, f.length() - JFCParser.FILE_EXTENSION.length());
+ }
+
+ // Invoked by DCmdStart
+ public static Configuration createKnown(String name) throws IOException, ParseException {
+ // Known name, no need for permission
+ for (KnownConfiguration known : getKnownConfigurations()) {
+ if (known.isNamed(name)) {
+ return known.getConfigurationFile();
+ }
+ }
+ // Check JFC directory
+ SafePath path = SecuritySupport.JFC_DIRECTORY;
+ if (path != null && SecuritySupport.exists(path)) {
+ for (String extension : Arrays.asList("", JFCParser.FILE_EXTENSION)) {
+ SafePath file = new SafePath(path.toPath().resolveSibling(name + extension));
+ if (SecuritySupport.exists(file) && !SecuritySupport.isDirectory(file)) {
+ try (Reader r = SecuritySupport.newFileReader(file)) {
+ String jfcName = nameFromPath(file.toPath());
+ return JFCParser.createConfiguration(jfcName, r);
+ }
+ }
+ }
+ }
+
+ // Assume path included in name
+
+ Path localPath = Paths.get(name);
+ String jfcName = nameFromPath(localPath);
+ try (Reader r = Files.newBufferedReader(localPath)) {
+ return JFCParser.createConfiguration(jfcName, r);
+ }
+ }
+
+ private static String readContent(InputStream source) throws IOException {
+ byte[] bytes = read(source, BUFFER_SIZE);
+ return new String(bytes, StandardCharsets.UTF_8);
+ }
+
+ // copied from java.io.file.Files to avoid dependency on JDK 9 code
+ private static byte[] read(InputStream source, int initialSize) throws IOException {
+ int capacity = initialSize;
+ byte[] buf = new byte[capacity];
+ int nread = 0;
+ int n;
+ for (;;) {
+ // read to EOF which may read more or less than initialSize (eg: file
+ // is truncated while we are reading)
+ while ((n = source.read(buf, nread, capacity - nread)) > 0)
+ nread += n;
+
+ // if last call to source.read() returned -1, we are done
+ // otherwise, try to read one more byte; if that failed we're done too
+ if (n < 0 || (n = source.read()) < 0)
+ break;
+
+ // one more byte was read; need to allocate a larger buffer
+ if (capacity <= MAX_BUFFER_SIZE - capacity) {
+ capacity = Math.max(capacity << 1, BUFFER_SIZE);
+ } else {
+ if (capacity == MAX_BUFFER_SIZE)
+ throw new OutOfMemoryError("Required array size too large");
+ capacity = MAX_BUFFER_SIZE;
+ }
+ buf = Arrays.copyOf(buf, capacity);
+ buf[nread++] = (byte)n;
+ }
+ return (capacity == nread) ? buf : Arrays.copyOf(buf, nread);
+ }
+
+
+ /**
+ * Returns list of predefined configurations available.
+ *
+ * @return list of configurations, not null
+ */
+ public static List<Configuration> getConfigurations() {
+ List<Configuration> configs = new ArrayList<>();
+ for (KnownConfiguration knownConfig : getKnownConfigurations()) {
+ try {
+ configs.add(knownConfig.getConfigurationFile());
+ } catch (IOException e) {
+ Logger.log(LogTag.JFR, LogLevel.WARN, "Could not load configuration " + knownConfig.getName() + ". " + e.getMessage());
+ } catch (ParseException e) {
+ Logger.log(LogTag.JFR, LogLevel.WARN, "Could not parse configuration " + knownConfig.getName() + ". " + e.getMessage());
+ }
+ }
+ return configs;
+ }
+
+ private static List<KnownConfiguration> getKnownConfigurations() {
+ if (knownConfigurations == null) {
+ List<KnownConfiguration> configProxies = new ArrayList<>();
+ for (SafePath p : SecuritySupport.getPredefinedJFCFiles()) {
+ try {
+ configProxies.add(new KnownConfiguration(p));
+ } catch (IOException ioe) {
+ // ignore
+ }
+ }
+ knownConfigurations = configProxies;
+ }
+ return knownConfigurations;
+ }
+
+ public static Configuration getPredefined(String name) throws IOException, ParseException {
+ for (KnownConfiguration knownConfig : getKnownConfigurations()) {
+ if (knownConfig.getName().equals(name)) {
+ return knownConfig.getConfigurationFile();
+ }
+ }
+ throw new NoSuchFileException("Could not locate configuration with name " + name);
+ }
+}