76 lines
2.4 KiB
Java
76 lines
2.4 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package art.test;
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import java.util.concurrent.locks.ReentrantLock;
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public class TestWatcher {
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// Lock to synchronize access to the static state of this class.
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private static final ReentrantLock lock = new ReentrantLock();
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private static volatile boolean criticalFailure = false;
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private static boolean reportingEnabled = true;
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private static boolean doingReport = false;
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private static void MonitorEnter() {
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lock.lock();
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}
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private static void MonitorExit() {
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// Need to do this manually since we need to notify critical failure but would deadlock if
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// waited for the unlock.
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if (!lock.isHeldByCurrentThread()) {
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NotifyCriticalFailure();
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throw new IllegalMonitorStateException("Locking error!");
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} else {
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lock.unlock();
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}
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}
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// Stops reporting. Must be paired with an EnableReporting call.
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public static void DisableReporting() {
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MonitorEnter();
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reportingEnabled = false;
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}
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// Stops reporting. Must be paired with a DisableReporting call.
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public static void EnableReporting() {
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reportingEnabled = true;
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MonitorExit();
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}
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public static void NotifyCriticalFailure() {
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criticalFailure = true;
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}
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public static void NotifyConstructed(Object o) {
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if (criticalFailure) {
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// Something went very wrong. We are probably trying to report it so don't get in the way.
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return;
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}
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MonitorEnter();
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// We could enter an infinite loop if println allocates (which it does) so we disable
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// reporting while we are doing a report. Since we are synchronized we won't miss any
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// allocations.
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if (reportingEnabled && !doingReport) {
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doingReport = true;
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System.out.println("Object allocated of type '" + o.getClass().getName() + "'");
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doingReport = false;
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}
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MonitorExit();
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}
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}
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