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/*******************************************************************************
* Copyright (c) 2011 Wind River Systems, Inc. and others. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tm.te.runtime.stepper;
import java.util.Date;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.Status;
import org.eclipse.tm.te.runtime.callback.Callback;
import org.eclipse.tm.te.runtime.concurrent.util.ExecutorsUtil;
import org.eclipse.tm.te.runtime.interfaces.ISharedConstants;
import org.eclipse.tm.te.runtime.stepper.activator.CoreBundleActivator;
import org.eclipse.tm.te.runtime.stepper.interfaces.IContext;
import org.eclipse.tm.te.runtime.stepper.interfaces.IContextStep;
import org.eclipse.tm.te.runtime.stepper.interfaces.IContextStepExecutor;
import org.eclipse.tm.te.runtime.stepper.interfaces.IExtendedContextStep;
import org.eclipse.tm.te.runtime.stepper.interfaces.IFullQualifiedId;
import org.eclipse.tm.te.runtime.stepper.interfaces.tracing.ITraceIds;
import org.eclipse.tm.te.runtime.utils.ProgressHelper;
import org.eclipse.tm.te.runtime.utils.StatusHelper;
/**
* Step executor implementation.
* <p>
* The step executor is responsible for initiating the execution of a single step. The executor
* creates and associated the step callback and blocks the execution till the executed step invoked
* the callback.
* <p>
* The step executor is passing any status thrown by the executed step to the parent stepper
* instance for handling.
* <p>
* If the step to execute is of type {@link IExtendedContextStep}, the step executor is calling
* {@link IExtendedContextStep#initializeFrom(org.eclipse.tm.te.runtime.stepper.interfaces.IContext, Object, org.eclipse.tm.te.runtime.stepper.interfaces.IFullQualifiedId, IProgressMonitor)} and
* {@link IExtendedContextStep#validateExecute(org.eclipse.tm.te.runtime.stepper.interfaces.IContext, Object, org.eclipse.tm.te.runtime.stepper.interfaces.IFullQualifiedId, IProgressMonitor)} before calling
* {@link IContextStep#execute(org.eclipse.tm.te.runtime.stepper.interfaces.IContext, Object, org.eclipse.tm.te.runtime.stepper.interfaces.IFullQualifiedId, IProgressMonitor, org.eclipse.tm.te.runtime.interfaces.callback.ICallback)}.
* <p>
* The methods will be called within the current step executor thread.
* <p>
* The stepper implementation can be traced and profiled by setting the debug options:
* <ul>
* <li><i>org.eclipse.tm.te.runtime.stepper/trace/stepping</i></li>
* <li><i>org.eclipse.tm.te.runtime.stepper/profile/stepping</i></li>
* </ul>
*/
public abstract class AbstractContextStepExecutor<Data extends Object> implements IContextStepExecutor<Data> {
/* (non-Javadoc)
* @see org.eclipse.tm.te.runtime.stepper.interfaces.IContextStepExecutor#execute(org.eclipse.tm.te.runtime.stepper.interfaces.IContextStep, org.eclipse.tm.te.runtime.stepper.interfaces.IFullQualifiedId, org.eclipse.tm.te.runtime.stepper.interfaces.IContext, java.lang.Object, org.eclipse.core.runtime.IProgressMonitor)
*/
@Override
public final void execute(IContextStep<Data> step, IFullQualifiedId id, final IContext context, final Data data, IProgressMonitor progress) throws CoreException {
Assert.isNotNull(step);
Assert.isNotNull(id);
Assert.isNotNull(context);
Assert.isNotNull(data);
Assert.isNotNull(progress);
long startTime = System.currentTimeMillis();
CoreBundleActivator.getTraceHandler().trace("AbstractContextStepExecutor#execute: *** START (" + step.getLabel() + ")", //$NON-NLS-1$ //$NON-NLS-2$
0, ITraceIds.TRACE_STEPPING, IStatus.WARNING, this);
CoreBundleActivator.getTraceHandler().trace(" [" + ISharedConstants.TIME_FORMAT.format(new Date(startTime)) + "]" //$NON-NLS-1$ //$NON-NLS-2$
+ " ***", //$NON-NLS-1$
0, ITraceIds.PROFILE_STEPPING, IStatus.WARNING, this);
int ticksToUse = (step instanceof IExtendedContextStep) ? ((IExtendedContextStep<Data>)step).getTotalWork(context, data) : IProgressMonitor.UNKNOWN;
progress = ProgressHelper.getProgressMonitor(progress, ticksToUse);
ProgressHelper.beginTask(progress, step.getLabel(), ticksToUse);
// Create the handler (and the callback) for the current step
final Callback callback = new Callback();
// Catch any exception that might occur during execution.
// Errors are passed through by definition.
try {
// Execute the step. Spawn to the dispatch thread if necessary.
if (step instanceof IExtendedContextStep<?>) {
IExtendedContextStep<Data> extendedStep = (IExtendedContextStep<Data>)step;
// IExtendedContextStep provides protocol for initialization and validation.
extendedStep.initializeFrom(context, data, id, progress);
// step is initialized -> now validate for execution.
// If the step if not valid for execution, validateExecute is throwing an exception.
extendedStep.validateExecute(context, data, id, progress);
}
step.execute(context, data, id, progress, callback);
// Wait till the step finished, an execution occurred or the
// user hit cancel on the progress monitor.
ExecutorsUtil.waitAndExecute(0, callback.getDoneConditionTester(null));
// Check the status of the step
normalizeStatus(step, id, context, data, callback.getStatus());
}
catch (Exception e) {
CoreBundleActivator.getTraceHandler().trace("AbstractContextStepExecutor#execute: Exception catched: class ='" + e.getClass().getName() + "'" //$NON-NLS-1$ //$NON-NLS-2$
+ ", message = '" + e.getLocalizedMessage() + "'" //$NON-NLS-1$ //$NON-NLS-2$
+ ", cause = " //$NON-NLS-1$
+ (e instanceof CoreException ? ((CoreException)e).getStatus().getException() : e.getCause()),
0, ITraceIds.TRACE_STEPPING, IStatus.WARNING, this);
// If the exception is a CoreException by itself, just re-throw
if (e instanceof CoreException) {
// Check if the message does need normalization
if (isExceptionMessageFormatted(e.getLocalizedMessage())) {
throw (CoreException)e;
}
// We have to normalize the status message first
normalizeStatus(step, id, context, data, ((CoreException)e).getStatus());
} else {
// all other exceptions are repackaged within a CoreException
normalizeStatus(step, id, context, data, StatusHelper.getStatus(e));
}
}
finally {
if (!progress.isCanceled()) {
progress.done();
}
// Give the step a chance for cleanup
if (step instanceof IExtendedContextStep<?>) {
((IExtendedContextStep<Data>)step).cleanup(context, data, id, progress);
}
long endTime = System.currentTimeMillis();
CoreBundleActivator.getTraceHandler().trace("AbstractContextStepExecutor#execute: *** DONE (" + step.getLabel() + ")", //$NON-NLS-1$ //$NON-NLS-2$
0, ITraceIds.TRACE_STEPPING, IStatus.WARNING, this);
CoreBundleActivator.getTraceHandler().trace(" [" + ISharedConstants.TIME_FORMAT.format(new Date(endTime)) //$NON-NLS-1$
+ " , delay = " + (endTime - startTime) + " ms]" //$NON-NLS-1$ //$NON-NLS-2$
+ " ***", //$NON-NLS-1$
0, ITraceIds.PROFILE_STEPPING, IStatus.WARNING, this);
}
}
private void normalizeStatus(IContextStep<Data> step, IFullQualifiedId id, IContext context , Data data, IStatus status) throws CoreException {
Assert.isNotNull(context);
Assert.isNotNull(data);
Assert.isNotNull(id);
Assert.isNotNull(step);
if (status == null || status.isOK()) {
return;
}
switch (status.getSeverity()) {
case IStatus.CANCEL:
throw new OperationCanceledException(status.getMessage());
default:
String message = formatMessage(status.getMessage(), status.getSeverity(), step, id, context, data);
status = new Status(status.getSeverity(), status.getPlugin(), status.getCode(), message != null ? message : status.getMessage(), status.getException());
throw new CoreException(status);
}
}
/**
* Checks if the given message is already formatted to get displayed to the user.
*
* @param message The message. Must not be <code>null</code>.
* @return <code>True</code> if the message is already formatted to get displayed to the user, <code>false</code> otherwise.
*/
protected abstract boolean isExceptionMessageFormatted(String message);
/**
* Format the message depending on the severity.
*
* @param message The message to format.
* @param severity The message severity.
* @param step The step.
* @param id The full qualified step id.
* @param context The target context.
* @param data The step data.
* @return Formatted message.
*/
protected abstract String formatMessage(String message, int severity, IContextStep<Data> step, IFullQualifiedId id, IContext context, Data data);
}
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