org.apache.jena.sparql.mgt.QueryEngineInfo Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jena-arq Show documentation
Show all versions of jena-arq Show documentation
ARQ is a SPARQL 1.1 query engine for Apache Jena
/*
* 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 org.apache.jena.sparql.mgt;
import java.util.concurrent.atomic.AtomicLong ;
import org.apache.jena.atlas.lib.DateTimeUtils ;
import org.apache.jena.query.Query ;
import org.apache.jena.sparql.algebra.Op ;
public class QueryEngineInfo implements QueryEngineInfoMBean
{
// Has to be careful about concurrency.
// It is possible that the count may be momentarily wrong
// (reading longs is not atomic).
private AtomicLong count = new AtomicLong(0) ;
@Override
public long getQueryCount() { return count.get() ; }
public void incQueryCount() { count.incrementAndGet() ; }
Query query = null ;
@Override
public String getLastQueryString()
{
Query q = query ; // Get once.
if ( q != null ) return q.toString() ;
// Sometimes an alegra expression is executited without a query.
return getLastAlgebra() ;
}
public void setLastQueryString(Query q) { query = q ; }
private Op op = null ;
@Override
public String getLastAlgebra()
{
Op _op = op ; // Get once.
return _op == null ? "none" : _op.toString() ;
}
public void setLastOp(Op op) { this.op = op ; }
private String timeSeen = "" ;
@Override
public String getLastQueryExecAt() { return timeSeen ; }
public void setLastQueryExecAt() { timeSeen = DateTimeUtils.nowAsString() ; }
// private long lastExecTime ;
// public long getLastQueryExecTime() { return lastExecTime ; }
// public void setLastQueryExecTime(long timeMillis) { lastExecTime = timeMillis ; }
}