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/*******************************************************************************
* Copyright (c) 2007 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal.node;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import org.eclipse.jpt.utility.internal.SynchronizedBoolean;
/**
* This implementation of Runnable will asynchronously validate
* a branch of nodes. It will wait until a shared "validate" flag is
* set to validate the branch. Once the the branch is validated,
* the thread will quiesce until the flag is set again.
*
* There are two ways to stop this thread:
* - Thread.interrupt()
* - set the "continue" flag to false
* For now, these two are equivalent; but in the future we might
* pass the "continue" flag to the Node.validateBranch()
* method so we can short-circuit the validation instead of waiting
* until the entire branch is validated.
*/
public class RunnableValidation
implements Runnable
{
/** The node whose branch this thread will validate. */
private final Node node;
/** When this flag is set to true, we kick off the validation routine. */
private final SynchronizedBoolean validateFlag;
/** When this flag is set to false, we allow this thread to die. */
private final SynchronizedBoolean continueFlag;
/** Log any exceptions encountered during validation with the following settings. */
private final Logger exceptionLogger;
private final Level exceptionLevel;
private final String exceptionMessage;
/**
* Construct a validation thread.
*/
public RunnableValidation(
Node node,
SynchronizedBoolean validateFlag,
SynchronizedBoolean continueFlag,
Logger exceptionLogger,
Level exceptionLevel,
String exceptionMessage
) {
super();
this.node = node;
this.validateFlag = validateFlag;
this.continueFlag = continueFlag;
this.exceptionLogger = exceptionLogger;
this.exceptionLevel = exceptionLevel;
this.exceptionMessage = exceptionMessage;
}
// ********** Runnable Implementation **********
/**
* Loop while the "continue" flag is true and the thread
* has not been interrupted by another thread.
* In each loop: Wait until the "validate" flag is set to true,
* then set it back to false and validate the branch of nodes.
*/
public void run() {
while (this.continueFlag.isTrue()) {
try {
this.validateFlag.waitToSetFalse();
} catch (InterruptedException ex) {
// we were interrupted while waiting, must be quittin' time
return;
}
this.validateNode();
}
}
/**
* Validate the node, logging any exceptions.
* If an exception occurs, we terminate the validation until the
* "validation" flag is set again. Some exceptions occur because
* of concurrent changes to the model that occur *after* validation
* starts but before it completes an entire pass over the model. If that
* is the case, things should be OK; because the exception will be
* caught and the "validation" flag will have been set again *during* the
* initial validation pass. So when we return from catching the exception
* we will simply re-start the validation, hopefully with the model in
* a consistent state that will prevent another exception from
* occurring. Of course, if we have any exceptions that are *not*
* the result of the model being in an inconsistent state, we will
* probably fill the log; and those exceptions are bugs that need
* to be fixed. (!) Hopefully the user will notice the enormous log and
* contact support.... ~bjv
*/
private void validateNode() {
try {
this.node.validateBranch();
} catch (Throwable ex) {
this.logException(ex);
}
}
/**
* We need to do all this because Logger#log(LogRecord) does not pass through
* Logger#doLog(LogRecord) like all the other Logger#log(...) methods.
*/
private void logException(Throwable ex) {
LogRecord logRecord = new LogRecord(this.exceptionLevel, this.exceptionMessage);
logRecord.setParameters(new Object[] { this.node.displayString() });
logRecord.setThrown(ex);
logRecord.setLoggerName(this.exceptionLogger.getName());
logRecord.setResourceBundle(this.exceptionLogger.getResourceBundle());
this.exceptionLogger.log(logRecord);
}
}
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