Optimize Services Printer
-------------------------
Key: FELIX-2282
URL: https://issues.apache.org/jira/browse/FELIX-2282
Project: Felix
Issue Type: Improvement
Affects Versions: webconsole-3.0.0
Reporter: Valentin Valchev
Fix For: webconsole-3.0.2
Attachments: ServicesConfigurationPrinter.java
When navigating through the Configuration Status tabs, the Services is a little
bit slower than others (except Bundles, which is the slowest). I look at the
code and it might be improved, to make is faster.
It seems that implementation now is so slow because first it renders to JSON
and then converts he data to text.
A significant optimization can be achieved if:
1. Skip to JSON conversion - generate the text directly from the service
references.
2. Improve usage of message formatter by using pre-parsed formatters:
{code}
final MessageFormat format = new MessageFormat(pattern);
..
format.format(object[])
{code}
instead of
{code}
MessageFormat.format(pattern, object[])
{code}
3. reuse one Object[] for MessageFormat - this will reduce the temporary objects
---
I've also created a prototype and the performance improvement is even visible
while browsing the tabs. The measured results are:
ServicesServlet.printConfiguration(): now = 250
ServicesConfigurationPrinter.printConfiguration(): now = 140
ServicesServlet.printConfiguration(): now = 250
ServicesConfigurationPrinter.printConfiguration(): now = 141
ServicesServlet.printConfiguration(): now = 265
ServicesConfigurationPrinter.printConfiguration(): now = 125
ServicesServlet.printConfiguration(): now = 250
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