Revision history for Perl extension Helios.

2.40  Sun Jan 22 22:30:00 2012
	-NEW Extensible logging subsystem (Helios::Logger) 
	-NEW Helios::Error::BaseError exception class; acts as parent for
	 entire Helios::Error:: hierarchy
	-NEW Helios::Service->metarun() method to modularize metajob 
	 handling and provide for extensible metajob support 
	-NEW service run() and metarun() methods now run in an eval 
	 block as a process safety measure to catch uncaught exceptions.
	-NEW MP3IndexerService example application including in eg/
	 directory (StubService also rewritten for clarity)
	-REVISED Helios::Service->work() method no longer pays attention 
	 to return value of run() method (this feature was under-
	 documented, misunderstood, and caused problems with eval {} and 
	 Try::Tiny exception handling
	-REWRITTEN submitJob.pl CGI script; supports sending XML stream 
	 in addition to form encoding, no longer dependent on 
	 HELIOS_CLASS_MAP
	-REWRITTEN Helios::TestService; more modern Perl and easier to 
	 understand
	-REWRITTEN install instructions, including specific instructions 
	 for Red Hat- and Ubuntu-based systems, and including CPAN install 
     bundles (still experimental)
    -REWRITTEN Helios::Tutorial 
    -Helios::Service:  fixed MaxRetries() and RetryInterval() retry 
     job methods
	-Helios::Job:  changed failed() and failedNoRetry() to limit the 
	 char length of the error recorded to 254 chars.  That's one less 
	 than the default size of the db field in the ERROR table, so it 
	 should prevent long errors like stack traces from unexpectedly 
	 blowing up worker processes and potentially losing jobs.
	-Revised dependencies:
	 DBI 1.52 (shipped with RHEL/CentOS 5)
	 XML::Simple 2.14 (shipped with RHEL/CentOS 5)
	 Removed XML::SAX dependency (unnecessary)
	 Removed XML::Namespace dependency (unnecessary)
	 Removed XML::Parser dependency (unnecessary)
	-Removed deprecated classes, methods, and other files:
	 Helios::Service->parseArgXML() (deprecated since 2.00)
	 Helios::Worker (deprecated since 2.00)
	 sql/helios_schema_20upgrade.sql	 
	-Updated copyright notices
	-Switch to "Linux-style" versioning: 
	 odd minor version == development version
	 even minor version == stable version
	 second minor number == patch level
	 (we're still also using Perl-style _ for devel versions too)
2.23  Fri Sep 10 12:22:00 2010
	-Helios::Job: fixed bug where getArgXML() returned undef if job
	 object was vivified from job queue
2.22  Thu May 21 11:30:00 2009
	-Helios::Service: fixed a bug in getFuncidFromDb() that caused 
	 services to fail to load properly if there was no entry for them 
	 in FUNCMAP table.
	-helios.pl: Several revisions to make it a more robust daemon. Now
	 honors TERM signal; 'kill <pid>' from a shell will attempt to 
	 safely shut down workers and daemon process w/o using Panoptes
	-Documentation updates
2.21  Thu May 14 17:00:00 2009
	-added set/getJob() accessors to facilitate access to current 
	 Helios::Job object from methods other than run()
2.20  Tue Apr 28 18:00:00 2009
    -various tweaks for cross-platform compatibility
    -documentation additions/corrections
    -added Helios::LogEntry::Levels to remove dependencies on 
     Sys::Syslog
    -helios.pl: Cleaned up messages to console after daemonize
	-helios.pl + Helios::Service: added support for WORKER_MAX_TTL 
	 config param
    -Helios::Service: added JobClass() allow extensible Helios::Job 
     classes
    -Helios::Service: added MaxRetries() and RetryInterval() to replace
     TheSchwartz's max_retries() and retry_interval() (this is not an 
     abitrary change; it's to allow for extensions at the Helios layer 
     in the future)
    -Helios::Service: added default run() method for class completeness
     (it throws a Helios::Error::FatalNoRetry error because you forgot 
     to implement a run() method)
    -Helios::Service: removed logging to syslogd to eliminate 
     Sys::Syslog dependency (see HeliosX::ExtLoggerService)
    -Helios::Service: added set/getFuncid(), getFuncidFromDb() and 
     changed jobWaiting() to use them.  This eliminates an unnecessary 
     database query previously done every time jobsWaiting() was called
    -Helios::Service: added support for log_priority_threshold config 
     param
    -Helios::Job: added getFailures() to access the number of times a 
     job has previously failed
2.00  Fri Aug 01 02:00:00 2008
	-First public production release (same as 1.90_26 w/more documentation)
1.90_26 Thu Jun 26 11:30:00 2008
	-Helios 2.0 RC1
	-NEW Helios 2.0 API
	 Helios::Service
	 Helios::Job
	 Helios::MetajobBurstService
	 Helios::ConfigParam
	 Helios::JobHistory
	 Helios::LogEntry
	 Helios::TestService
	-helios.pl: added PID check to prevent 2 instances of a service 
	 running on the same server
	-helios.pl: added --clear-halt option to clear Worker Admin HALTs 
	 at the cmd line
	-helios.sql: new helios_worker_registry_tb.start_time field for 
	 uptime stats
	-submitJob.pl, helios_job_submit.pl, helios_job_clean.pl use new 
	 2.0 API
	-eg/Stub/StubService.pm for example of new 2.0 API service class
	-new tests to test both 1.x and 2.x API	
1.19_07 Thu May 29 14:00:00 2008
	-added Helios.pm (for version checking & documentation)
	-added Helios::Job (for eventual refactoring)
	-added Helios::Test (for system testing)
1.19_06 Wed May 28 12:00:00 2008
	-added LICENSE file that was left out
	-add helios_log_clean.pl utility to clean log, job history
	-added eg/Stub/StubWorker.pm as a worker class stub example
1.19  Mon May 19 12:00:00 2008
	-First public release