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/*******************************************************************************
* Copyright (c) 2007, 2016 Wind River Systems 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.dsf.ui.concurrent;
import java.lang.reflect.Field;
import java.util.concurrent.Executor;
import org.eclipse.cdt.dsf.concurrent.DataRequestMonitor;
import org.eclipse.cdt.dsf.concurrent.DsfExecutable;
import org.eclipse.cdt.dsf.concurrent.RequestMonitor;
import org.eclipse.cdt.dsf.internal.DsfPlugin;
import org.eclipse.cdt.dsf.ui.viewmodel.VMViewerUpdate;
import org.eclipse.core.runtime.Platform;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerUpdate;
/**
* Data Request monitor that takes <code>IViewerUpdate</code> as a parent.
* If the IViewerUpdate is canceled, this request monitor becomes canceled as well.
* @see IViewerUpdate
*
* @since 1.0
*/
public class ViewerDataRequestMonitor<V> extends DataRequestMonitor<V> {
/**
* Same as {@link DsfExecutable#DEBUG_MONITORS}
*/
static private boolean DEBUG_MONITORS = DsfPlugin.DEBUG && Boolean.parseBoolean(
Platform.getDebugOption("org.eclipse.cdt.dsf/debug/monitors")); //$NON-NLS-1$
private final IViewerUpdate fUpdate;
public ViewerDataRequestMonitor(Executor executor, IViewerUpdate update) {
super(executor, null);
fUpdate = update;
if (DEBUG_MONITORS) {
createMonitorBacktrace();
}
}
@Override
public synchronized boolean isCanceled() {
return fUpdate.isCanceled() || super.isCanceled();
}
@Override
protected void handleSuccess() {
fUpdate.done();
}
@Override
protected void handleErrorOrWarning() {
fUpdate.setStatus(getStatus());
fUpdate.done();
}
@Override
protected void handleCancel() {
fUpdate.setStatus(getStatus());
fUpdate.done();
}
/**
* Instrument this object with a backtrace of the monitors this instance is
* chained to. See {@link DsfExecutable#DEBUG_MONITORS}. The logic here has
* to subvert Java access protection by using reflection. That's OK; this is
* not production code. This stuff will only ever run when tracing is turned
* on.
*/
private void createMonitorBacktrace() {
StringBuilder str = new StringBuilder();
RequestMonitor nextrm = this;
VMViewerUpdate nextupdate = null;
String type = null;
while (true) {
StackTraceElement topFrame = null;
if (nextupdate != null) {
type = "update "; //$NON-NLS-1$ extra space to match length of 'monitor'
topFrame = getCreatedAtTopFrame(nextupdate);
nextrm = getMonitor(nextupdate);
nextupdate = null;
}
else if (nextrm != null) {
type = "monitor"; //$NON-NLS-1$
topFrame = getCreatedAtTopFrame(nextrm);
if (nextrm instanceof ViewerDataRequestMonitor<?>) {
ViewerDataRequestMonitor<?> vdrm = (ViewerDataRequestMonitor<?>)nextrm;
nextupdate = (vdrm.fUpdate instanceof VMViewerUpdate) ? (VMViewerUpdate)vdrm.fUpdate : null;
nextrm = null;
}
else {
nextrm = getParentMonitor(nextrm);
nextupdate = null;
}
}
else {
break;
}
if (topFrame != null) {
str.append('[').append(type).append("] ").append(topFrame).append('\n'); //$NON-NLS-1$
}
else {
str.append("<unknown>\n"); //$NON-NLS-1$
}
}
Field field;
try {
field = RequestMonitor.class.getDeclaredField("fMonitorBacktrace"); //$NON-NLS-1$
field.setAccessible(true);
field.set(this, str.toString());
} catch (IllegalAccessException e) {
} catch (SecurityException e) {
} catch (NoSuchFieldException e) {
}
}
/**
* Utility used by {@link #createMonitorBacktrace()}. Subverts access
* protection.
*/
private static RequestMonitor getMonitor(VMViewerUpdate update) {
try {
Field field = VMViewerUpdate.class.getDeclaredField("fRequestMonitor"); //$NON-NLS-1$
field.setAccessible(true);
return (RequestMonitor) field.get(update);
} catch (IllegalAccessException e) {
} catch (SecurityException e) {
} catch (NoSuchFieldException e) {
} catch (ClassCastException e) {
}
return null;
}
/**
* Utility used by {@link #createMonitorBacktrace()}. Subverts access
* protection.
*/
private static RequestMonitor getParentMonitor(RequestMonitor rm) {
try {
Field field = RequestMonitor.class.getDeclaredField("fParentRequestMonitor"); //$NON-NLS-1$
field.setAccessible(true);
return (RequestMonitor) field.get(rm);
} catch (IllegalAccessException e) {
} catch (NoSuchFieldException e) {
}
return null;
}
/**
* Utility used by {@link #createMonitorBacktrace()}. Subverts access
* protection.
*/
private static <T extends DsfExecutable> StackTraceElement getCreatedAtTopFrame(T dsfExecutable) {
try {
Field field_fCreatedAt = DsfExecutable.class.getDeclaredField("fCreatedAt"); //$NON-NLS-1$
field_fCreatedAt.setAccessible(true);
Object obj_fCreatedAt = field_fCreatedAt.get(dsfExecutable);
Class<?> class_StackTraceElement = Class.forName("org.eclipse.cdt.dsf.concurrent.StackTraceWrapper"); //$NON-NLS-1$
Field field_fStackTraceElements = class_StackTraceElement.getDeclaredField("fStackTraceElements"); //$NON-NLS-1$
field_fStackTraceElements.setAccessible(true);
StackTraceElement[] frames = (StackTraceElement[])field_fStackTraceElements.get(obj_fCreatedAt);
if (frames != null && frames.length > 0) {
return frames[0];
}
} catch (IllegalAccessException e) {
} catch (NoSuchFieldException e) {
} catch (ClassNotFoundException e) {
}
return null;
}
}
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