--- a/src/jdk.jfr/share/classes/jdk/jfr/consumer/AbstractEventStream.java Fri Sep 13 18:46:07 2019 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,286 +0,0 @@
-/*
- * Copyright (c) 2019, 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.consumer;
-
-import java.io.IOException;
-import java.security.AccessControlContext;
-import java.security.AccessController;
-import java.security.PrivilegedAction;
-import java.time.Duration;
-import java.time.Instant;
-import java.util.Comparator;
-import java.util.Objects;
-import java.util.concurrent.atomic.AtomicLong;
-import java.util.function.Consumer;
-
-import jdk.jfr.internal.JVM;
-import jdk.jfr.internal.LogLevel;
-import jdk.jfr.internal.LogTag;
-import jdk.jfr.internal.Logger;
-import jdk.jfr.internal.SecuritySupport;
-
-/*
- * Purpose of this class is to simplify the implementation of
- * an event stream. In particular, it handles:
- *
- * - configuration storage
- * - atomic updates to a configuration
- * - dispatch mechanism
- * - error handling
- * - security
- *
- */
-abstract class AbstractEventStream implements EventStream {
-
- static final Comparator<? super RecordedEvent> END_TIME = (e1, e2) -> Long.compare(e1.endTimeTicks, e2.endTimeTicks);
-
- private final static AtomicLong counter = new AtomicLong(1);
- private final Object terminated = new Object();
- private final boolean active;
- private final Runnable flushOperation = () -> dispatcher().runFlushActions();
- private final AccessControlContext accessControllerContext;
- private final StreamConfiguration configuration = new StreamConfiguration();
-
- private volatile Thread thread;
- private Dispatcher dispatcher;
-
- private volatile boolean closed;
-
- public AbstractEventStream(AccessControlContext acc, boolean active) throws IOException {
- this.accessControllerContext = Objects.requireNonNull(acc);
- this.active = active;
- }
-
- @Override
- abstract public void start();
-
- @Override
- abstract public void startAsync();
-
- @Override
- abstract public void close();
-
- protected final Dispatcher dispatcher() {
- if (configuration.hasChanged()) {
- synchronized (configuration) {
- dispatcher = new Dispatcher(configuration);
- }
- }
- return dispatcher;
- }
-
- @Override
- public final void setOrdered(boolean ordered) {
- configuration.setOrdered(ordered);
- }
-
- @Override
- public final void setReuse(boolean reuse) {
- configuration.setReuse(reuse);
- }
-
- @Override
- public final void setStartTime(Instant startTime) {
- Objects.nonNull(startTime);
- synchronized (configuration) {
- if (configuration.started) {
- throw new IllegalStateException("Stream is already started");
- }
- if (startTime.isBefore(Instant.EPOCH)) {
- startTime = Instant.EPOCH;
- }
- configuration.setStartTime(startTime);
- }
- }
-
- @Override
- public final void setEndTime(Instant endTime) {
- Objects.requireNonNull(endTime);
- synchronized (configuration) {
- if (configuration.started) {
- throw new IllegalStateException("Stream is already started");
- }
- configuration.setEndTime(endTime);
- }
- }
-
- @Override
- public final void onEvent(Consumer<RecordedEvent> action) {
- Objects.requireNonNull(action);
- configuration.addEventAction(action);
- }
-
- @Override
- public final void onEvent(String eventName, Consumer<RecordedEvent> action) {
- Objects.requireNonNull(eventName);
- Objects.requireNonNull(action);
- configuration.addEventAction(eventName, action);
- }
-
- @Override
- public final void onFlush(Runnable action) {
- Objects.requireNonNull(action);
- configuration.addFlushAction(action);
- }
-
- @Override
- public final void onClose(Runnable action) {
- Objects.requireNonNull(action);
- configuration.addCloseAction(action);
- }
-
- @Override
- public final void onError(Consumer<Throwable> action) {
- Objects.requireNonNull(action);
- configuration.addErrorAction(action);
- }
-
- @Override
- public final boolean remove(Object action) {
- Objects.requireNonNull(action);
- return configuration.remove(action);
- }
-
- @Override
- public final void awaitTermination() throws InterruptedException {
- awaitTermination(Duration.ofMillis(0));
- }
-
- @Override
- public final void awaitTermination(Duration timeout) throws InterruptedException {
- Objects.requireNonNull(timeout);
- if (timeout.isNegative()) {
- throw new IllegalArgumentException("timeout value is negative");
- }
-
- long base = System.currentTimeMillis();
- long now = 0;
-
- long millis;
- try {
- millis = Math.multiplyExact(timeout.getSeconds(), 1000);
- } catch (ArithmeticException a) {
- millis = Long.MAX_VALUE;
- }
- int nanos = timeout.toNanosPart();
- if (nanos == 0 && millis == 0) {
- synchronized (terminated) {
- while (!isClosed()) {
- terminated.wait(0);
- }
- }
- } else {
- while (!isClosed()) {
- long delay = millis - now;
- if (delay <= 0) {
- break;
- }
- synchronized (terminated) {
- terminated.wait(delay, nanos);
- }
- now = System.currentTimeMillis() - base;
- }
- }
- }
-
- protected abstract void process() throws Exception;
-
- protected final void setClosed(boolean closed) {
- this.closed = closed;
- }
-
- protected final boolean isClosed() {
- return closed;
- }
-
- protected final void startAsync(long startNanos) {
- startInternal(startNanos);
- Runnable r = () -> run(accessControllerContext);
- thread = SecuritySupport.createThreadWitNoPermissions(nextThreadName(), r);
- thread.start();
- }
-
- protected final void start(long startNanos) {
- startInternal(startNanos);
- thread = Thread.currentThread();
- run(accessControllerContext);
- }
-
- protected final Runnable getFlushOperation() {
- return flushOperation;
- }
-
- private void startInternal(long startNanos) {
- synchronized (configuration) {
- if (configuration.started) {
- throw new IllegalStateException("Event stream can only be started once");
- }
- if (active) {
- configuration.setStartNanos(startNanos);
- }
- configuration.setStarted(true);
- }
- }
-
- private void execute() {
- JVM.getJVM().exclude(Thread.currentThread());
- try {
- process();
- } catch (IOException ioe) {
- // This can happen if a chunk file is removed, or
- // a file is access that has been closed
- // This is "normal" behavior for streaming and the
- // stream will be closed when this happens
- } catch (Exception e) {
- // TODO: Remove before integrating
- e.printStackTrace();
- } finally {
- Logger.log(LogTag.JFR_SYSTEM_STREAMING, LogLevel.DEBUG, "Execution of stream ended.");
- try {
- close();
- } finally {
- synchronized (terminated) {
- terminated.notifyAll();
- }
- }
- }
- }
-
- private void run(AccessControlContext accessControlContext) {
- AccessController.doPrivileged(new PrivilegedAction<Void>() {
- @Override
- public Void run() {
- execute();
- return null;
- }
- }, accessControlContext);
- }
-
- private String nextThreadName() {
- counter.incrementAndGet();
- return "JFR Event Stream " + counter;
- }
-}
\ No newline at end of file