/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.sparql.engine.iterator;
import org.slf4j.Logger ;
import org.slf4j.LoggerFactory ;
import com.hp.hpl.jena.sparql.engine.QueryIterator ;
import com.hp.hpl.jena.sparql.engine.binding.Binding ;
import com.hp.hpl.jena.sparql.util.Timer ;
public class QueryIteratorTiming extends QueryIteratorWrapper
{
static private Logger log = LoggerFactory.getLogger(QueryIteratorTiming.class) ;
static final public int NotStarted = -2 ;
static final public int NotFinished = -1 ;
public static QueryIteratorTiming time(QueryIterator iter) { return new QueryIteratorTiming(iter) ; }
private QueryIteratorTiming(QueryIterator iter)
{
super(iter) ;
}
@Override
protected boolean hasNextBinding() { start() ; return super.hasNextBinding() ; }
@Override
protected Binding moveToNextBinding() { start() ; return super.moveToNextBinding() ; }
@Override
protected void closeIterator()
{
super.closeIterator() ;
stop() ;
}
private Timer timer = null ;
private long milliseconds = NotStarted ;
private void start()
{
if ( timer == null )
{
timer = new Timer() ;
timer.startTimer() ;
milliseconds = NotFinished ;
}
}
private void stop()
{
if ( timer == null )
{
milliseconds = 0 ;
return ;
}
milliseconds = timer.endTimer() ;
// if ( log.isDebugEnabled() )
// log.debug("Iterator: {} milliseconds", milliseconds) ;
log.info("Execution: {} milliseconds", milliseconds) ;
}
/** Return the elapsed time, in milliseconds, between the first call to this iterator and the close call.
* Returns the time, or NotStarted (-2) or NotFinished (-1).
*/
public long getMillis() { return milliseconds ; }
}