com.nflabs.zeppelin.zengine.ZPlan Maven / Gradle / Ivy
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Zengine is java framework for data analysis on Hadoop. see http://nflabs.github.io/zeppelin/#/zengine
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package com.nflabs.zeppelin.zengine;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import com.nflabs.zeppelin.driver.LazyConnection;
import com.nflabs.zeppelin.driver.ZeppelinConnection;
import com.nflabs.zeppelin.driver.ZeppelinDriverFactory;
import com.nflabs.zeppelin.result.Result;
import com.nflabs.zeppelin.zengine.stmt.Z;
public class ZPlan extends LinkedList{
public ZPlan(){
}
public LinkedList execute(Zengine zengine) throws Exception{
return execute(zengine, null);
}
public LinkedList execute(Zengine zengine, List> params) throws Exception{
LinkedList results = new LinkedList();
ZeppelinDriverFactory driverFactory = zengine.getDriverFactory();
for (int i=0; i p = new HashMap();
if(params!=null && params.size()>=i+1){
p = params.get(i);
}
try {
zz.withParams(p);
ZeppelinConnection conn = zz.getConnection();
if (conn instanceof LazyConnection) {
((LazyConnection)conn).initialize(driverFactory);
}
zz.execute(conn);
results.add(zz.result());
zz.release();
} catch (Exception e) {
closeAllConnections();
throw e;
}
}
closeAllConnections();
return results;
}
private void closeAllConnections(){
for (int i=0; i