BlackBerry PIM is why so slow contact is created?
The following code, I got the blackberry Forum, takes almost 26 minutes to create 2000 random contacts using the PIM API of BB on one set of 8500 series. Does anyone have an idea why it takes so long or how to improve the performance of creation of contact in the address book?
HM... 26 minutes for 2000 contacts means ms 780 by a contact.
(1) you can check contact.commit (); is not the call much more time here? You could do that relatively accurate with sth like this:
long timeSpentOnCommits; defined somewhere at a higher level
...
Start long = System.currentTimeMillis ();
contact.Commit ();
took a long time = System.currentTimeMillis () - start;
timeSpentOnCommits += taken;
...
then after that all contacts have been added, you can get
an hour of average validation:
long timePerOneCommit = timeSpentOnCommits / 2000;
Discover the obtained value in a 'dialogue' or a logging
If it takes most of the time, so I don't think you can improve it.
(2) another idea - in the loop 'for' you create too many String objects, so this forces the operating system to call the garbage collection too frequently (which is a thing of your time).
Use StringBuffer instead. So instead of the
addr [contact. ADDR_POSTALCODE] =
arrSzAlphas [generator.nextInt (arrSzAlphas.length)]
+ arrSzAlphas [generator.nextInt (arrSzAlphas.length)]
+ Integer.toString (generator.nextInt (99))
+ Integer.toString (generator.nextInt (9))
+ " "
+ arrSzAlphas [generator.nextInt (arrSzAlphas.length)]
[+ arrSzAlphas [generator.nextInt (arrSzAlphas.length)];
Use this:
addr [contact. ADDR_POSTALCODE] = new StringBuffer()
. Append (arrSzAlphas [Generator.nextInt (arrSzAlphas.Length)])
. Append (arrSzAlphas [Generator.nextInt (arrSzAlphas.Length)])
. Append (Generator.nextInt (99))
. Append (Generator.nextInt (9))
. Append(' ')
. Append (arrSzAlphas [Generator.nextInt (arrSzAlphas.Length)])
. Append (arrSzAlphas [Generator.nextInt (arrSzAlphas.Length)])
. toString();
StringBuffer.append () is too important for any primitive type, so it can accept integer (ints) and the characters directly without needing to be converted into String objects.
The same approach should be used for the generation of phone numbers.
(3) minor speed improvements could be obtained by the extraction of all repetition of the loop calls "for". For example, just count how many times you call to arrSzAlphas.length (iterations 2000 * 4 calls per iteration = 8000 times!), while you could call ONCE before the loop and store it in a visible final local variable of the loop. It is the same for a set of contacts.isSupportedXXXX calls - you must call him not included in all iterations, just call him once before the start of the loop.
Tags: BlackBerry Developers
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