/**
* (C) Copyright IBM Corp. 2010, 2015
*
* Licensed 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.ibm.bi.dml.conf;
import org.apache.hadoop.mapred.JobConf;
/**
* Singleton for accessing the parsed and merged system configuration.
*
* NOTE: parallel execution of multiple DML scripts (in the same JVM) with different configurations
* would require changes/extensions of this class.
*/
public class ConfigurationManager
{
private static DMLConfig _conf = null; //read systemml configuration
private static JobConf _rJob = null; //cached job conf for read-only operations
static{
_rJob = new JobConf();
}
/**
*
* @param conf
*/
public synchronized static void setConfig( DMLConfig conf )
{
_conf = conf;
}
/**
*
* @return
*/
public synchronized static DMLConfig getConfig()
{
return _conf;
}
/**
* Returns a cached JobConf object, intended for global use by all operations
* with read-only access to job conf. This prevents to read the hadoop conf files
* over and over again from classpath. However,
*
* @return
*/
public static JobConf getCachedJobConf()
{
return _rJob;
}
/**
*
* @param job
*/
public static void setCachedJobConf(JobConf job)
{
_rJob = job;
}
}