Task.pm.svn-base
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- #########################################################################
- # OpenKore - Task framework
- # Copyright (c) 2006 OpenKore Team
- #
- # This software is open source, licensed under the GNU General Public
- # License, version 2.
- # Basically, this means that you're allowed to modify and distribute
- # this software. However, if you distribute modified versions, you MUST
- # also distribute the source code.
- # See http://www.gnu.org/licenses/gpl.html for the full license.
- #########################################################################
- ##
- # MODULE DESCRIPTION: Abstract task base class.
- #
- # This is the abstract base class for all tasks. Please read
- # <a href="http://www.openkore.com/wiki/index.php/AI_subsystem_and_task_framework_overview">
- # the AI subsystem and task framework overview
- # </a>
- # for an overview.
- #
- # <h3>Notes on priority constants</h3>
- # The only things you may assume about the values of priority contants are:
- # `l
- # - Each priority constant differ at least a value of 100 from other priority constants.
- # That is, <tt>abs(c1 - c2) >= 300</tt> if c1 and c2 are two random priority constants.
- # - A higher value means a higher priority.
- # `l`
- package Task;
- use strict;
- use Carp;
- use Carp::Assert;
- use Modules 'register';
- use Utils::CallbackList;
- use Utils::Set;
- ####################################
- ### CATEGORY: Priority constants
- ###################################
- ##
- # Task::LOW_PRIORITY
- #
- # Indicates a low task priority.
- use constant LOW_PRIORITY => 100;
- ##
- # Task::NORMAL_PRIORITY
- #
- # Indicates a normal task priority.
- use constant NORMAL_PRIORITY => 500;
- ##
- # Task::HIGH_PRIORITY
- #
- # Indicates a high task priority.
- use constant HIGH_PRIORITY => 1000;
- ##
- # Task::USER_PRIORITY
- #
- # Priority used for user-invoked commands.
- use constant USER_PRIORITY => 5000;
- ###################################
- ### CATEGORY: Status constants
- ###################################
- ##
- # Task::INACTIVE
- #
- # Indicates that the task has just been created.
- use constant INACTIVE => 0;
- ##
- # Task::RUNNING
- #
- # Indicates that the task is running.
- use constant RUNNING => 1;
- ##
- # Task::INTERRUPTED
- #
- # Indicates that the task is interrupted, and not running.
- use constant INTERRUPTED => 2;
- ##
- # Task::STOPPED
- #
- # Indicates that the task is stopped. A stopped task cannot resume.
- use constant STOPPED => 3;
- ##
- # Task::DONE
- #
- # Indicates that the task is completed. A completed task cannot be stopped or interrupted.
- use constant DONE => 4;
- ####################################
- ### CATEGORY: Constructor
- ###################################
- ##
- # Task->new(options...)
- # Ensures: result->getStatus() == Task::INACTIVE
- #
- # Create a new Task object. The following options are allowed:
- # `l
- # - <tt>name</tt> - A name for this task. $Task->getName() will return this name.
- # If not specified, the class's name (excluding the "Task::" prefix) will be used as name.
- # - <tt>priority</tt> - A priority for this task. $Task->getPriority() will return this value.
- # The default priority is Task::NORMAL_PRIORITY
- # - <tt>mutexes</tt> - A reference to an array of mutexes. $Task->getMutexes() will return this value.
- # The default is an empty mutex list.
- # `l`
- sub new {
- my $class = shift;
- my %args = @_;
- my $allowed = new Set("name", "priority", "mutexes");
- my %self;
- foreach my $key (keys %args) {
- if ($allowed->has($key)) {
- $self{"T_$key"} = $args{$key};
- }
- }
- if (!defined $self{T_name}) {
- $self{T_name} = $class;
- $self{T_name} =~ s/.*:://;
- }
- $self{T_status} = INACTIVE;
- $self{T_priority} = NORMAL_PRIORITY if (!defined $self{T_priority});
- $self{T_mutexes} = [] if (!defined $self{T_mutexes});
- $self{T_onMutexesChanged} = new CallbackList("onMutexesChanged");
- $self{T_onStop} = new CallbackList("onStop");
- return bless %self, $class;
- }
- sub _getStatusName {
- my ($status) = @_;
- if ($status == INACTIVE) {
- return 'INACTIVE';
- } elsif ($status == RUNNING) {
- return 'RUNNING';
- } elsif ($status == INTERRUPTED) {
- return 'INTERRUPTED';
- } elsif ($status == STOPPED) {
- return 'STOPPED';
- } elsif ($status == DONE) {
- return 'DONE';
- } else {
- return $status;
- }
- }
- sub _assertStatus {
- my $self = shift;
- my $currentStatus = $self->{T_status};
- foreach my $status (@_) {
- if ($status == $currentStatus) {
- return;
- }
- }
- my @expectedStatuses = map { _getStatusName($_) } @_;
- Carp::confess("The current task's status should be one of: (" . join(',', @expectedStatuses) . ")n" .
- "But it's actually: " . _getStatusName($currentStatus) . "n");
- }
- ############################
- ### CATEGORY: Queries
- ############################
- ##
- # String $Task->getName()
- # Ensures: $result ne ""
- #
- # Returns a human-readable name for this task.
- sub getName {
- return $_[0]->{T_name};
- }
- ##
- # $Task->getStatus()
- #
- # Returns the task's status. This is one of Task::RUNNING, Task::INTERRUPTED, Task::STOPPED or Task::DONE.
- sub getStatus {
- return $_[0]->{T_status};
- }
- ##
- # Hash* $Task->getError()
- # Requires: $self->getStatus() == Task::DONE
- #
- # If the status is Task::DONE, then return information about the error (if the task
- # completed with an error).
- # Otherwise (if the task completed successfully), return undef.
- #
- # The error information is a reference to a hash, containing two items:
- # `l
- # - code - The error code.
- # - message - The error message.
- # `l`
- sub getError {
- $_[0]->_assertStatus(DONE) if DEBUG;
- return $_[0]->{T_error};
- }
- ##
- # Array<String>* $Task->getMutexes()
- # Ensures: defined(result)
- #
- # Returns a reference to an array of mutexes for this task. Note that the mutex list may
- # change during a Task's life time. This list must not be modified outside the Task object.
- #
- # If you override this method, then you <b>must</b> ensure that when the mutex list changes,
- # you trigger a onMutexesChanged event. Otherwise the task manager will not behave correctly.
- sub getMutexes {
- return $_[0]->{T_mutexes};
- }
- ##
- # int $Task->getPriority()
- #
- # Get the priority for this task. This priority is guaranteed to never change during a Task's
- # life time.
- sub getPriority {
- return $_[0]->{T_priority};
- }
- #####################################
- ### CATEGORY: Events
- #####################################
- ##
- # CallbackList $Task->onMutexesChanged()
- #
- # This event is triggered when the mutex list for this task has changed.
- sub onMutexesChanged {
- return $_[0]->{T_onMutexesChanged};
- }
- ##
- # CallbackList $Task->onStop()
- #
- # This event is triggered when the task's status has been set to Task::STOPPED.
- sub onStop {
- return $_[0]->{T_onStop};
- }
- #####################################
- ### CATEGORY: Protected commands
- #####################################
- ##
- # void $Task->setError(code, message)
- # code: An error code.
- # message: An error message.
- # Requires: $self->getStatus() == Task::INACTIVE or Task::RUNNING
- #
- # Indicate that the task has been completed, but with an error.
- # The status will be set to Task::DONE, and $Task->getError() will return
- # the error information passed to this method.
- #
- # Do not call this method outside $Task->iterate(), or bad things will happen!
- sub setError {
- my ($self, $code, $message) = @_;
- $self->_assertStatus(INACTIVE, RUNNING) if DEBUG;
- $self->{T_error} = {
- code => $code,
- message => $message
- };
- $self->{T_status} = DONE;
- }
- ##
- # void $Task->setDone()
- # Requires: $self->getStatus() == Task::INACTIVE or Task::RUNNING
- #
- # Indicate that the task has been completed, without error. The
- # status will be set to Task::DONE.
- #
- # Do not call this method outside $Task->iterate(), or bad things will happen!
- sub setDone {
- my ($self) = @_;
- $self->_assertStatus(INACTIVE, RUNNING) if DEBUG;
- $self->{T_status} = DONE;
- }
- ##
- # void $Task->setStopped()
- # Requires: $self->getStatus() == Task::RUNNING, Task::INACTIVE or Task::INTERRUPTED
- # Ensures: $self->getStatus() == Task::STOPPED
- #
- # Set the task's status to Task::STOPPED and trigger an onStop event.
- # This is useful for tasks that cannot stop immediately
- # when stop() is called: they can mark the task as stopped when appropriate.
- sub setStopped {
- my ($self) = @_;
- $self->_assertStatus(INACTIVE, RUNNING, INTERRUPTED) if DEBUG;
- $self->{T_status} = STOPPED;
- $self->{T_onStop}->call($self);
- }
- ##
- # void $Task->setMutexes(mutexes...)
- #
- # Set the currently active mutexes for this task. This will trigger an
- # onMutexesChanged event.
- #
- # You should only call this method inside the class's iterate() method,
- # or during initialization. Otherwise you may confuse the task manager.
- sub setMutexes {
- my $self = shift;
- $self->{T_mutexes} = @_;
- $self->{T_onMutexesChanged}->call($self);
- }
- #####################################
- ### CATEGORY: Public commands
- #####################################
- ##
- # void $Task->activate()
- # Requires: $self->getStatus() == Task::INACTIVE
- # Ensures: $self->getStatus() == Task::RUNNING
- #
- # Notify a task that it will be activated. Activation happens only once:
- # just before iterate() is called, but only if the task has just been created.
- # This allows the task to perform initialization.
- #
- # This method will be called by the task manager.
- sub activate {
- $_[0]->_assertStatus(INACTIVE) if DEBUG;
- $_[0]->{T_status} = RUNNING;
- }
- ##
- # void $Task->interrupt()
- # Requires: $self->getStatus() == Task::RUNNING
- # Ensures: $self->getStatus() == Task::INTERRUPTED
- #
- # Notify a (running) task that it is about to be interrupted. The task may take necessary actions
- # (like updating internal timers) in preparation for interruption. The task must immediately
- # cease all actions, and set the status to Task::INTERRUPTED.
- #
- # This method should only be called by the task manager.
- #
- # Task implementors may override this method to implement code for interruption handling.
- sub interrupt {
- $_[0]->_assertStatus(RUNNING) if DEBUG;
- $_[0]->{T_status} = INTERRUPTED;
- }
- ##
- # void $Task->resume()
- # Requires: $self->getStatus() == Task::INTERRUPTED
- # Ensures: $self->getStatus() == Task::RUNNING
- #
- # Notify an (interrupted) task that it is about to be resumed. The task may take
- # necessary actions in prepration for resuming. The task must set its status to
- # Task::RUNNING.
- #
- # This method should only be called by the task manager.
- #
- # Task implementors may override this method to implement code for resume handling.
- sub resume {
- $_[0]->_assertStatus(INTERRUPTED) if DEBUG;
- $_[0]->{T_status} = RUNNING;
- }
- ##
- # void $Task->stop()
- # Requires: $self->getStatus() == Task::RUNNING, Task::INACTIVE or Task::INTERRUPTED
- #
- # Notify a task that it must completely stop. When the task is actually stopped,
- # the status must be set to Task::STOPPED.
- #
- # The default behavior is to immediate set the status to Task::STOPPED
- # by calling $Task->setStopped(), thereby triggering an onStop event.
- # Task implementors may override this method to implement custom stop handling.
- # You may choose to stop the task after a period of time, instead of immediately.
- #
- # This method may be called by anybody, not just the task manager.
- sub stop {
- $_[0]->setStopped();
- }
- ##
- # void $Task->iterate()
- # Requires: $self->getStatus() == Task::RUNNING
- #
- # Run one iteration of this task. Task implementors must override this method to
- # implement task code.
- sub iterate {
- $_[0]->_assertStatus(RUNNING) if DEBUG;
- }
- 1;