/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.bigdata.rdf.task;
import java.util.concurrent.Callable;
import com.bigdata.journal.IConcurrencyManager;
import com.bigdata.journal.IIndexManager;
import com.bigdata.journal.Journal;
import com.bigdata.service.IBigdataFederation;
/**
* Wrapper for a task to be executed in a stand-off fashion. This can be used
* for the {@link IBigdataFederation} since it provides access to the global
* view of a scale-out index. It can also be used for a {@link Journal} if are
* not relying on the {@link IConcurrencyManager} to guard the resources
* declared by the task.
* <p>
* Note: Global locks are NOT used in scale-out and operations will be only
* shard-wise ACID.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @param <T>
*/
public class ApiTaskForIndexManager<T> implements Callable<T> {
private final IIndexManager indexManager;
private final IApiTask<T> delegate;
public ApiTaskForIndexManager(final IIndexManager indexManager,
final IApiTask<T> delegate) {
this.indexManager = indexManager;
this.delegate = delegate;
}
@Override
public T call() throws Exception {
delegate.setIndexManager(indexManager);
try {
// Run the delegate task.
final T ret = delegate.call();
return ret;
} finally {
delegate.setIndexManager(null);
}
}
}