/*
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about the software to the Fermilab Software Providers.
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may be used to endorse or promote products derived from this software
without specific prior written permission.
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*/
package org.dcache.resilience.util;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import diskCacheV111.util.CacheException;
import diskCacheV111.util.PnfsId;
import org.dcache.util.CacheExceptionFactory;
/**
* <p>Wrapper methods for processing and handling {@link CacheException}s.</p>
*/
public final class CacheExceptionUtils {
public static boolean fileNotFound(Serializable object) {
if (object instanceof ExecutionException) {
ExecutionException exception = (ExecutionException) object;
object = exception.getCause();
}
if (object instanceof CacheException) {
CacheException exception = (CacheException) object;
switch (exception.getRc()) {
case CacheException.FILE_NOT_FOUND:
case CacheException.FILE_NOT_IN_REPOSITORY:
/*
* For the purposes of remove we can consider this equivalent.
*/
case CacheException.TIMEOUT:
return true;
}
}
return false;
}
public static CacheException getCacheException(int rc,
String template,
PnfsId pnfs,
String optional,
Throwable e) {
List<Object> args = new ArrayList<>();
args.add(pnfs);
if (optional != null) {
args.add(optional);
}
if (e != null) {
args.add(new ExceptionMessage(e));
}
String message = String.format(template, args.toArray());
if (e != null) {
return CacheExceptionFactory.exceptionOf(rc, message, e);
}
return CacheExceptionFactory.exceptionOf(rc, message);
}
public static FailureType getFailureType(CacheException exception,
boolean isCopyOperation) {
if (exception == null) {
return FailureType.RETRIABLE;
}
switch (exception.getRc()) {
case CacheException.FILE_CORRUPTED:
case CacheException.BROKEN_ON_TAPE:
return FailureType.BROKEN;
case CacheException.FILE_NOT_IN_REPOSITORY:
case CacheException.FILE_NOT_FOUND:
if (isCopyOperation) {
/*
* The source for a copy is missing.
*/
return FailureType.NEWSOURCE;
}
/*
* This is a remove operation. Trying to remove
* a file which doesn't exist suggests the remove
* information is faulty or subject to a race.
* Consider this fatal.
*/
return FailureType.FATAL;
/*
*
* The replica already exists on this target.
*/
case CacheException.FILE_IN_CACHE:
return FailureType.NEWTARGET;
/*
* These are transient source errors.
*/
case CacheException.LOCKED:
case CacheException.FILE_IS_NEW:
case CacheException.HSM_DELAY_ERROR:
/*
* There is not enough information to know whether
* these involve the source or target.
*
* The logic of the resilience service, however, is
* to retry these for the indicated number of times,
* and if we continue to fail, the source and target are
* both marked tried, and an attempt with a new source
* and target is made, if possible.
*/
case CacheException.NO_POOL_CONFIGURED:
case CacheException.NO_POOL_ONLINE:
case CacheException.POOL_DISABLED:
case CacheException.SELECTED_POOL_FAILED:
case CacheException.PERMISSION_DENIED:
case CacheException.SERVICE_UNAVAILABLE:
case CacheException.TIMEOUT:
return FailureType.RETRIABLE;
default:
return FailureType.FATAL;
}
}
public enum FailureType {
BROKEN, NEWTARGET, NEWSOURCE, FATAL, RETRIABLE
}
private CacheExceptionUtils() {
}
}