src/jdk.jfr/share/classes/jdk/jfr/consumer/EventFileStream.java
author egahlin
Fri, 13 Sep 2019 18:46:07 +0200
branchJEP-349-branch
changeset 58129 7b751fe181a5
parent 58020 f082177c5023
permissions -rw-r--r--
Restructure stream configuration
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/*
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 * Copyright (c) 2019, 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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package jdk.jfr.consumer;
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import java.io.IOException;
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import java.nio.file.Path;
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import java.security.AccessControlContext;
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import java.util.Arrays;
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import java.util.Objects;
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import jdk.jfr.internal.consumer.FileAccess;
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import jdk.jfr.internal.consumer.RecordingInput;
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/**
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 * Implementation of an event stream that operates against a recording file.
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 *
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 */
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final class EventFileStream extends AbstractEventStream {
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    private final RecordingInput input;
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    private ChunkParser chunkParser;
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    private RecordedEvent[] sortedList;
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    EventFileStream(AccessControlContext acc, Path path) throws IOException {
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        super(acc, false);
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        Objects.requireNonNull(path);
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        this.input = new RecordingInput(path.toFile(), FileAccess.UNPRIVILIGED);
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    }
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    @Override
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    public void start() {
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        start(0);
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    }
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    @Override
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    public void startAsync() {
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        startAsync(0);
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    }
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    @Override
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    public void close() {
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        setClosed(true);
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        dispatcher().runCloseActions();
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        try {
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            input.close();
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        } catch (IOException e) {
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            // ignore
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        }
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    }
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    @Override
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    protected void process() throws IOException {
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        Dispatcher disp = dispatcher();
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        long start = 0;
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        long end = Long.MAX_VALUE;
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        if (disp.startTime != null) {
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            start = disp.startNanos;
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        }
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        if (disp.endTime != null) {
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            end = disp.endNanos;
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        }
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        chunkParser = new ChunkParser(input, disp.parserConfiguration);
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        while (!isClosed()) {
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            if (chunkParser.getStartNanos() > end) {
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                close();
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                return;
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            }
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            disp = dispatcher();
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            disp.parserConfiguration.filterStart = start;
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            disp.parserConfiguration.filterEnd = end;
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            chunkParser.updateConfiguration(disp.parserConfiguration, true);
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            chunkParser.setFlushOperation(getFlushOperation());
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            if (disp.parserConfiguration.ordered) {
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                processOrdered(disp);
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            } else {
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                processUnordered(disp);
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            }
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            if (isClosed() || chunkParser.isLastChunk()) {
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                return;
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            }
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            chunkParser = chunkParser.nextChunkParser();
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        }
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    }
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    private void processOrdered(Dispatcher c) throws IOException {
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        if (sortedList == null) {
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            sortedList = new RecordedEvent[10_000];
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        }
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        RecordedEvent event;
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        int index = 0;
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        while (true) {
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            event = chunkParser.readEvent();
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            if (event == null) {
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                Arrays.sort(sortedList, 0, index, END_TIME);
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                for (int i = 0; i < index; i++) {
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                    c.dispatch(sortedList[i]);
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                }
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                return;
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            }
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            if (index == sortedList.length) {
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                RecordedEvent[] tmp = sortedList;
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                sortedList = new RecordedEvent[2 * tmp.length];
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                System.arraycopy(tmp, 0, sortedList, 0, tmp.length);
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            }
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            sortedList[index++] = event;
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        }
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    }
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    private void processUnordered(Dispatcher c) throws IOException {
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        while (!isClosed()) {
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            RecordedEvent event = chunkParser.readEvent();
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            if (event == null) {
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                return;
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            }
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            c.dispatch(event);
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        }
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    }
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}