Peter de Vos > BPM-Engine > BPM::Engine

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Module Version: 0.01   Source  

NAME ^

BPM::Engine - Business Process Execution Engine

VERSION ^

0.01

SYNOPSIS ^

Create a new BPM engine

  use BPM::Engine;

  my $callback = sub {
      my($runner, $entity, $event, $node, $instance) = @_;
      ...
      };

  my $engine = BPM::Engine->new(
      log_dispatch_conf => 'log.conf',
      connect_info      => { dsn => $dsn, user => $user, password => $password },
      callback          => $callback
      );

Save an XPDL file with workflow process definitions, and retrieve the process definitions

  my $package = $engine->create_package('/path/to/model.xpdl');

  my @processes = $engine->get_process_definitions->all;

Create and run a process instance

  my $instance = $engine->create_process_instance(
      $process, { instance_name => 'My first process run' }
      );

  $engine->start_process_instance($instance, { param1 => 'value1' });

DISCLAIMER ^

This is ALPHA SOFTWARE. Use at your own risk. Features may change.

DESCRIPTION ^

BPM::Engine is an embeddable workflow process engine with persistence. It handles saving and loading XPDL packages in a database, and running workflow processes.

INTERFACE ^

CONSTRUCTORS

BPM::Engine->new(%options)

Creates a new bpm engine.

    $engine = BPM::Engine->new(
      connect_info => {
        dsn      => $dsn,
        user     => $user,
        password => $pass,
        %dbi_attributes,
        %extra_attributes,
        });

Possible options are:

schema => $schema // BpmEngineStore

BPM::Engine::Store connected schema object. If not provided, one will be created using the connect_info option.

Either schema or connect_info is required on object construction.

connect_info => $dsn // ConnectInfo

DBIx::Class::Schema connection arguments that get passed to the connect() call to BPM::Engine::Store, as specified by the ConnectInfo type in BPM::Engine::Types::Internal.

Usually a single hashref with dsn/user/password and attributes.

This attribute is only used to build the schema attribute if not provided already.

logger => $logger // BpmEngineLogger

A logger object that implements the MooseX::LogDispatch::Interface role, defaults to a BPM::Engine::Logger instance constructed with log_dispatch_conf.

log_dispatch_conf => $file | $hashref

Optional constructor argument for BPM::Engine::Logger to build the default logger, if a logger was not provided.

callback => \&cb

Optional callback &cb which is called on all process instance events. This option is passed to any BPM::Engine::ProcessRunner constructor.

runner_traits => [qw/TraitA TraitB/] // []

Optional traits to be supplied to all BPM::Engine::ProcessRunner objects used.

BPM::Engine->new_with_config(%options)

    $engine = BPM::Engine->new_with_config(
      configfile => "/etc/bpmengine/engine.conf"
      );

Provided by the base role MooseX::SimpleConfig. Acts just like regular new(), but also accepts an argument configfile to specify the configfile from which to load other attributes.

configfile => $file // $ENV{HOME}/bpmengine/engine.conf

A file that, when passed to new_with_config, is parsed using Config::Any to support any of a variety of different config formats, detected by the file extension. See Config::Any for more details about supported formats.

Explicit arguments to new_with_config will override anything loaded from the configfile.

BPM::Engine->new_with_traits(%options)

Just like new(), but also accepts a traits argument with a list of trait names to apply to the engine object.

    $engine = BPM::Engine->new_with_traits(
        traits => [qw/Foo Bar/],
        schema => $schema
        );

Options, in addition to those to new():

traits => \@traitnames // []

Traits live under the BPM::Engine::Trait namespace by default, prefix full class names with a +.

BPM::Engine->with_traits(@traits)->new(%options)

You can use the with_traits class method to use traits in combination with a configuration file. Example:

    $engine = BPM::Engine->with_traits(qw/Foo Bar/)->new_with_config(
      configfile => '/home/user/bpmengine.conf'
      );

PROCESS DEFINITION METHODS

get_packages

    $rs = $engine->get_packages();

Get a DBIx::Class::ResultSet of BPM::Engine::Store::Result::Package rows. Takes the same arguments as the DBIx::Class::ResultSet search() method.

get_package

    $package = $engine->get_package($package_uuid);

Takes a package UUID or a hashref and optional standard DBIC resultset attributes and returns the BPM::Engine::Store::Result::Package row. Delegates to DBIx::Class::ResultSet's find() method.

Throws an exception if the package is not found.

create_package

    $package = $engine->create_package($file);

Takes XPDL xml input and returns a newly created Package row. Input can be a file path, URL, reference to a string or io stream.

Throws an exception if inconsistencies were found in the xml.

delete_package

    $deleted_package = $engine->delete_package($package_uuid);

Delete a package from the data store. Warning: this will also delete all processes and process instances related to the package.

An exception is thrown if the package is not in the database.

get_process_definitions

    $rs = $engine->get_process_definitions();

Get a DBIx::Class::ResultSet of BPM::Engine::Store::Result::Process rows. Takes the same arguments as the DBIx::Class::ResultSet search() method.

get_process_definition

    $process = $engine->get_process_definition($uuid);

Takes a package UUID or a hashref and optional standard DBIC resultset attributes and returns the corresponding BPM::Engine::Store::Result::Process row. Delegates to DBIx::Class::ResultSet's find() method.

Throws an exception if the process is not found.

PROCESS INSTANCE METHODS

get_process_instances

    $rs = $engine->get_process_instances();

Get a DBIx::Class::ResultSet of BPM::Engine::Store::Result::ProcessInstance rows. Takes the same arguments as the DBIx::Class::ResultSet search() method.

get_process_instance

    $process_instance = $engine->get_process_instance($pi_id);

Takes a package UUID or a hashref and optional standard DBIC resultset attributes and returns the corresponding BPM::Engine::Store::Result::ProcessInstance row. Delegates to DBIx::Class::ResultSet's find() method.

create_process_instance

    $process_instance = $engine->create_process_instance($process_id);

Creates a new process instance, given a process id or BPM::Engine::Store::Result::Process row object and an optional hash of process instance properties.

Of these process instance properties, instance_name is useful to specify a name for the instance. A name will be auto-generated if not specified.

Returns the BPM::Engine::Store::Result::ProcessInstance that was created.

start_process_instance

    $engine->start_process_instance($pi_id);

Starts to run a process instance given a process instance object or id, and an optional hash of process instance attributes.

delete_process_instance

    $engine->delete_process_instance($pi_id);

Takes a process instance id or a process instance object, and deletes the process instance from the data store.

An exception is thrown if the process instance is not found in the data store.

process_instance_attribute

    $attr = $engine->process_instance_attribute($pi_id, 'some_var');
    $attr = $engine->process_instance_attribute($pi_id, 'some_var', 'new_value');

Gets or sets a process instance attribute.

change_process_instance_state

    $engine->change_process_instance_state($pi_id, 'abort');

Sets the new state of the process instance given a process instance id or a process instance object and a state transition name.

The following state transitions are possible:

start

Changes the process instance state from open.not_running.ready to open.running.

suspend

Changes the process instance state from open.running to open.not_running.suspended.

resume

Changes the process instance state from open.not_running.suspended to open.running.

terminate

Changes the process instance state from open.not_running.ready, open.running or open.not_running.suspended to closed.cancelled.terminated. This is an end state (no more state transitions possible).

abort

Changes the process instance state from open.not_running.ready, open.running or open.not_running.suspended to closed.cancelled.aborted. This is an end state (no more state transitions possible).

finish

Changes the process instance state from open.running to closed.completed. This is an end state (no more state transitions possible).

An exception will be thrown for invalid state transitions, for example when the process instance is not in the right state to allow the transition.

ACTIVITY INSTANCE METHODS

get_activity_instances

    $rs = $engine->get_activity_instances();

Get a DBIx::Class::ResultSet of BPM::Engine::Store::Result::ActivityInstance rows. Takes the same arguments as the DBIx::Class::ResultSet search() method.

get_activity_instance

    $ai = $engine->get_activity_instance($aid);

change_activity_instance_state

    $engine->change_activity_instance_state($aid, 'finish');

Sets the new state of the activity instance given a activity instance id or a activity instance object and a state transition name.

The following state transitions are possible:

start

Changes the activity instance state from open.not_running.ready to open.running.not_assigned.

assign

Changes the activity instance state from open.not_running.ready or open.running.not_assigned to open.running.assigned.

reassign

Valid state transition when the activity instance state is open.running.assigned. Does not actually change the state.

unassign

Changes the activity instance state from open.running.assigned to open.running.not_assigned.

suspend

Changes the activity instance state from open.running.assigned to open.not_running.suspended.

resume

Changes the activity instance state from open.not_running.suspended to open.running.assigned.

abort

Changes the activity instance state from open.not_running.ready or open.running.assigned to closed.cancelled.aborted. This is an end state (no more state transitions possible).

finish

Changes the activity instance state from open.not_running.ready or open.running.assigned to closed.completed. This is an end state (no more state transitions possible).

activity_instance_attribute

    $attr = $engine->activity_instance_attribute($ai_id, 'some_var');
    $attr = $engine->activity_instance_attribute($ai_id, 'some_var', 'new_value');

Gets or sets an activity instance attribute, and returns the corresponding ActivityInstanceAttribute row.

LOGGING METHODS

    $engine->debug('Some thing did a thing');

The following methods of the attached logger object are available to the engine: log, debug, info, notice, warning, error, critical, alert, emergency

INTERNAL METHODS

runner

    $runner = $engine->runner($process_instance);

Returns a new BPM::Engine::ProcessRunner instance with the runner_traits and callback attribute applied for the specified process instance. Internal method, used by start_process_instance() and change_activity_instance_state() to advance a process instance.

DIAGNOSTICS ^

Exception Handling

When BPM::Engine encounters an API error, it throws a BPM::Engine::Exception object. You can catch and process these exceptions, see BPM::Engine::Exception for more information.

CONFIGURATION AND ENVIRONMENT ^

BPM::Engine may optionally be configured with a configuration file when constructed using the new_with_config method. See etc/engine.yaml for an example.

MAJOR DEPENDENCIES ^

See the included Makefile.PL for a list of all dependencies.

INCOMPATIBILITIES ^

None reported.

AUTHOR ^

Peter de Vos, <sitetech@cpan.org>

SOURCE ^

You can contribute or fork this project via GitHub:

  git clone git://github.com/sitetechie/BPM-Engine.git

BUGS ^

Probably. Along with error conditions not being handled gracefully etc.

They will be fixed in due course as I start using this more seriously, however in the meantime, patches are welcome :)

SUPPORT ^

You can find documentation for this module with the perldoc command.

    perldoc BPM::Engine

You can also look for information at:

COPYRIGHT AND LICENSE ^

Copyright (c) 2010, 2011 Peter de Vos.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

DISCLAIMER OF WARRANTY ^

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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