4. The Day the Application Stood Still
Application built and deployed
Works fine with some number of people, say 50
CPU is around 2%
Memory and disk IO is reasonable
Above that number of people
CPU spikes to ~90%
Users complain of frozen screens
Disk IO and memory usage spike
Becomes impossible to do the simplest tasks
What is going on?
5. The Beast
...
try {
InitialContext cxt = new InitialContext();
String dataSourceJndi = mapComponentSettings.get("AssocDataSource");
DataSource ds = (DataSource) cxt.lookup(dataSourceJndi);
privateAssociations.setDataSource(ds);
}
catch (Exception e) {
log.error("Unable to load JNDI data source from context.");
}
...
11. Started at Netscape in 1990’s
Input to Java team
Informed by projects from iFlow
and Interstage BPM in 2000’s
While the purpose of error
reporting is to assist in solving
the problem.
There is a problem
The system can’t handle it
The more completely the problem is
described, the faster it is resolved,
the happier users will be.
12. Throwing an exception should never be used to return a "normal" value
back to the caller.
Describe the current scope! Not what you think caused the exception.
Use a single monomorphic exception class.
• Every method (that throws) should declare throwing java.lang.Exception.
• Every catch block should catch java.lang.Exception
Do not assume that there is only one possible exception to be caught.
Always test for the exact exception class and the exact message key
before handling the exception in any other way than wrap and re-throw.
Don’t worry about making catch blocks efficient. Instead, design them to
be easy to maintain and easy to verify that the exception correctly
handled.
Act as if LOG files are not accessible
42. Required configuration in 6 different environments to be
consistent.
If one got our of sync, it broke the processes.
Messages were assumed to be reliable, but between reliable
system, they can NOT be reliable.
Your protocol MUST assume that messages are reliable, and
must deal with that.
55. Business Etiquette Modeling
For each role in an organization, determine:
each of the services that role might perform
what must be provided
what will be produced
what conditions will decide whether the task is accepted or not
what contexts all this is valid in
Use simulation across many roles in the organization to see if
the process is ‘optimal’
tweak the etiquette rules as necessary
Record history and track KPIs like normal
Respond if necessary by tweaking the etiquette rules
62. Four years running. Four books
Real-life use cases.
Experience with ACM.
http://AdaptiveCaseManagement.org/
Workflow Management Coalition
2014:
Thriving on
Adaptability:
Best
practices
for knowledge
workers
63. NEW!
When Thinking Matters in
the Workplace: How
Executives and Leaders of
Knowledge Work Teams can
Innovate with Case
Management.
http:// ThinkingMattersBook.com
64. Q & A
http:// www.slideshare.net / kswenson / mribp2015
69. Definition of BPM
Business Process Management (BPM) is a
discipline involving any combination of
modeling, automation, execution,
control, measurement and optimization
of business activity flows,
in support of enterprise goals,
spanning systems, employees, customers and partners
within and beyond the enterprise boundaries.
