| /******************************************************************************* |
| * Copyright (C) 2014, 2015 Google Inc and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Marcus Eng (Google) - initial API and implementation |
| * Sergey Prigogin (Google) |
| *******************************************************************************/ |
| package org.eclipse.ui.internal.monitoring.preferences; |
| |
| import org.eclipse.jface.dialogs.MessageDialog; |
| import org.eclipse.jface.preference.IPreferenceStore; |
| import org.eclipse.jface.util.IPropertyChangeListener; |
| import org.eclipse.jface.util.PropertyChangeEvent; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.ui.internal.monitoring.EventLoopMonitorThread; |
| import org.eclipse.ui.internal.monitoring.MonitoringPlugin; |
| import org.eclipse.ui.internal.monitoring.MonitoringStartup; |
| import org.eclipse.ui.monitoring.PreferenceConstants; |
| |
| /** |
| * Listens to preference changes and restarts the monitoring thread when necessary. |
| */ |
| public class MonitoringPreferenceListener implements IPropertyChangeListener { |
| private EventLoopMonitorThread monitoringThread; |
| /** |
| * A flag to handle the resetting of the {@link EventLoopMonitorThread}. The method |
| * {@link #refreshMonitoringThread()} can be called multiple times if multiple preferences are |
| * changed via the preference page. {@code monitorThreadRestartInProgress} is set on the first |
| * call to {@link #refreshMonitoringThread()}. Subsequent calls to restartMonitorThread do not |
| * schedule more resets while the flag is enabled. Once the scheduled asyncExec event executes, |
| * the flag is reset. |
| */ |
| private boolean monitorThreadRestartInProgress; |
| |
| public MonitoringPreferenceListener(EventLoopMonitorThread thread) { |
| monitoringThread = thread; |
| } |
| |
| @Override |
| public void propertyChange(PropertyChangeEvent event) { |
| String property = event.getProperty(); |
| if (!property.equals(PreferenceConstants.MONITORING_ENABLED) |
| && !property.equals(PreferenceConstants.DEADLOCK_REPORTING_THRESHOLD_MILLIS) |
| && !property.equals(PreferenceConstants.LONG_EVENT_ERROR_THRESHOLD_MILLIS) |
| && !property.equals(PreferenceConstants.LONG_EVENT_WARNING_THRESHOLD_MILLIS) |
| && !property.equals(PreferenceConstants.LOG_TO_ERROR_LOG) |
| && !property.equals(PreferenceConstants.MAX_STACK_SAMPLES) |
| && !property.equals(PreferenceConstants.UI_THREAD_FILTER) |
| && !property.equals(PreferenceConstants.NONINTERESTING_THREAD_FILTER)) { |
| return; |
| } |
| |
| synchronized (this) { |
| if (monitorThreadRestartInProgress) { |
| return; |
| } |
| |
| monitorThreadRestartInProgress = true; |
| |
| final Display display = MonitoringPlugin.getDefault().getWorkbench().getDisplay(); |
| // Schedule the event to restart the thread after all preferences have had enough time |
| // to propagate. |
| display.asyncExec(this::refreshMonitoringThread); |
| } |
| } |
| |
| private synchronized void refreshMonitoringThread() { |
| if (monitoringThread != null) { |
| monitoringThread.shutdown(); |
| monitoringThread = null; |
| } |
| monitorThreadRestartInProgress = false; |
| |
| MonitoringPlugin plugin = MonitoringPlugin.getDefault(); |
| IPreferenceStore preferences = plugin.getPreferenceStore(); |
| if (preferences.getBoolean(PreferenceConstants.MONITORING_ENABLED)) { |
| EventLoopMonitorThread thread = MonitoringStartup.createAndStartMonitorThread(); |
| // If thread is null, the newly-defined preferences are invalid. |
| if (thread == null) { |
| MessageDialog.openError( |
| plugin.getWorkbench().getActiveWorkbenchWindow().getShell(), |
| Messages.MonitoringPreferenceListener_preference_error_header, |
| Messages.MonitoringPreferenceListener_preference_error); |
| return; |
| } |
| |
| monitoringThread = thread; |
| } |
| } |
| } |