author | egahlin |
Mon, 30 Sep 2019 15:35:56 +0200 | |
branch | JEP-349-branch |
changeset 58402 | d284ff23fa4c |
parent 53016 | 9f13f8aad8dc |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2018, 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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/** |
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* This package contains classes for consuming Flight Recorder data. |
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* <p> |
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* In the following example, the program prints a histogram of all method samples in a recording. |
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* <pre> |
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* <code> |
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* public static void main(String[] args) throws IOException { |
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* if (args.length != 1) { |
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* System.err.println("Must specify a recording file."); |
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* return; |
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* } |
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* |
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* RecordingFile.readAllEvents(Path.of(args[0])).stream() |
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* .filter(e -> e.getEventType().getName().equals("jdk.ExecutionSample")) |
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* .map(e -> e.getStackTrace()) |
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* .filter(s -> s != null) |
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* .map(s -> s.getFrames().get(0)) |
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* .filter(f -> f.isJavaFrame()) |
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* .map(f -> f.getMethod()) |
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* .collect( |
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* Collectors.groupingBy(m -> m.getType().getName() + "." + m.getName() + " " + m.getDescriptor(), |
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* Collectors.counting())) |
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* .entrySet() |
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* .stream() |
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* .sorted((a, b) -> b.getValue().compareTo(a.getValue())) |
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* .forEach(e -> System.out.printf("%8d %s\n", e.getValue(), e.getKey())); |
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* } |
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* </code> |
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* </pre> |
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* <p> |
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* <b>Null-handling</b> |
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* <p> |
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* All methods define whether they accept or return {@code null} in the Javadoc. |
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* Typically this is expressed as {@code "not null"}. If a {@code null} |
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* parameter is used where it is not allowed, a |
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* {@code java.lang.NullPointerException} is thrown. If a {@code null} |
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* parameters is passed to a method that throws other exceptions, such as |
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* {@code java.io.IOException}, the {@code java.lang.NullPointerException} takes |
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* precedence, unless the Javadoc for the method explicitly states how |
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* {@code null} is handled, i.e. by throwing {@code java.lang.IllegalArgumentException}. |
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* |
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* @since 9 |
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*/ |
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package jdk.jfr.consumer; |