| /* |
| * Copyright (c) 2017, 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. |
| */ |
| |
| /** |
| * This package contains classes for consuming Flight Recorder data. |
| * <p> |
| * In the following example, the program prints a histogram of all method samples in a recording. |
| * <pre> |
| * <code> |
| * public static void main(String[] args) throws IOException { |
| * if (args.length != 1) { |
| * System.err.println("Must specify a recording file."); |
| * return; |
| * } |
| * |
| * RecordingFile.readAllEvents(Path.of(args[0])).stream() |
| * .filter(e -> e.getEventType().getName().equals("jdk.ExecutionSample")) |
| * .map(e -> e.getStackTrace()) |
| * .filter(s -> s != null) |
| * .map(s -> s.getFrames().get(0)) |
| * .filter(f -> f.isJavaFrame()) |
| * .map(f -> f.getMethod()) |
| * .collect( |
| * Collectors.groupingBy(m -> m.getType().getName() + "." + m.getName() + " " + m.getDescriptor(), |
| * Collectors.counting())) |
| * .entrySet() |
| * .stream() |
| * .sorted((a, b) -> b.getValue().compareTo(a.getValue())) |
| * .forEach(e -> System.out.printf("%8d %s\n", e.getValue(), e.getKey())); |
| * } |
| * </code> |
| * </pre> |
| * <p> |
| * <b>Null-handling</b> |
| * <p> |
| * All methods define whether they accept or return {@code null} in the Javadoc. |
| * Typically this is expressed as {@code "not null"}. If a {@code null} |
| * parameter is used where it is not allowed, a |
| * {@code java.lang.NullPointerException} is thrown. If a {@code null} |
| * parameters is passed to a method that throws other exceptions, such as |
| * {@code java.io.IOException}, the {@code java.lang.NullPointerException} takes |
| * precedence, unless the Javadoc for the method explicitly states how |
| * {@code null} is handled, i.e. by throwing {@code java.lang.IllegalArgumentException}. |
| * |
| * @since 9 |
| */ |
| package jdk.jfr.consumer; |
