----- Original Message -----
Sent: Wednesday, November 15, 2000 12:03
AM
Subject: RE: EJB Performance Question.
Every single one of those calls to dir.getXXX() has to go
across
the
network via RMI. This is slow. You are better off using
a
bulk
accessor pattern. For example, create a new class
called
DirView which contains all the attributes of your Dir EJB.
Then
make
a single call to the Dir EJB to get a DirView. This will
cause
only
1 RMI call and save you a huge amount of time.
Do
you understand? I can probably pseudo-code an
example
if
necessary.
-tim
Hi, every one. First i'm sorry for my
english.
We use servlet that call EJB. Next is code
fraction.
//---------------------------------------------------
public Vector findByFirstPage(DirHome home, Integer
rowCount) throws Exception{
Vector
rows = new Vector();
Dir dir =
null;
System.out.println("step 11 time : " + (new
java.util.Date()));
// call
EJB
Collection col =
home.findByFirstPage(rowCount.intValue());
Iterator iter =
col.iterator();
System.out.println("step 12 time : " + (new
java.util.Date()));
while(iter.hasNext()) {
dir = (Dir)iter.next();
rows.add(EJBToRow(dir));
//<------- #### bottle neck
#####
}
System.out.println("step 13
time : " + (new java.util.Date()));
return
rows;
}
//---------------------------------------------------
Simple code. In while loop, EJBToRow() method take 3
second each call.
Next code is EJBToRow(). Very Simple. Only call EJB Meber
methods.
//---------------------------------------------------
public Vector EJBToRow(Dir dir) throws Exception
{
Vector row = new Vector();
System.out.println("step 21 time : " + (new
java.util.Date()));
row.add(dir.getId());
row.add(new
Long(dir.getPId()));
row.add(dir.getName());
row.add(new
Long(dir.getSerial()));
row.add(new
Long(dir.getChildCount()));
row.add(new
Long(dir.getDepth()));
row.add(dir.getPMap());
row.add(dir.getType());
row.add(dir.getUserId());
row.add(dir.getGroupId());
row.add(dir.getOwnerPermR());
row.add(dir.getOwnerPermW());
row.add(dir.getOwnerPermX());
row.add(dir.getGroupPermR());
row.add(dir.getGroupPermW());
row.add(dir.getGroupPermX());
row.add(dir.getOtherPermR());
row.add(dir.getOtherPermW());
row.add(dir.getOtherPermX());
row.add(dir.getCreateDate());
row.add(dir.getUpdateDate());
row.add(dir.getExpireDate());
row.add(dir.getRemark());
System.out.println("step 22 time : " + (new
java.util.Date()));
return
row;
}
//---------------------------------------------------
What's the key problem?
