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get_start_time() returns the running
arrival’s start time (#304).set_source() to avoid leaking arrivals from the old
source (#322).tag argument (as part
of #287).amount
argument is deprecated in favor of the more generic name
target. The former will still work, but raises a warning
(#287 addressing #197).numeric_version.schedule objects
(#272).get_batch_size() getter allows a batch to retrieve
its size (#263).get_activity_time() and
get_activity_time_selected() getters allow an arrival to
retrieve the amount of activity time spent in resources (#186).simmer and
monitor objects in function environments for generators too
(#279).wait=FALSE, i.e.,
arrivals don’t need to trigger the same synchronize()
activity to be in sync (#275).when_activated()
(#250).simmer and
wrap environments (#241).deactivate(), which now unschedules future arrivals
(#249).trap(), synchronize()
and rollback(). These are stateful activities that require
storing information about passing arrivals to manage clones or
redirections. These activities were not properly cleaning their storage
when arrivals were rejected at some point in the trajectory. As a
result, certain simulations with these activities involved may show
random improper behaviour depending on how memory reuse happens. This
patch unifies storage management for stateful activities, adds a new
interface to register these activities and another interface for
arrivals to notify their termination, so that the stored information is
properly cleaned up (#231).select() (#233).timeout()
activity. This makes possible to set a null timeout so that the next
event is processed in the last place if several more events happen at
the same time (#229).Queueing Systems vignette with a section
about custom service policies (as part of #229).out and keep_seized parameters to
leave() with the same behaviour as in
renege_in() and renege_if(). Code and
documentation of these functions are now integrated under
help(renege) (#208, #217).from, to and
from_to accept dynamic parameters for arguments
start_time, stop_time and every
(#219).add_generator() and
add_resource() respectively if a vector of names is
provided (#221).get_mon_*() dispatch for named lists (#210).from, to and
from_to to preserve the environment of the supplied
functions (as part of #219).keep_seized resources after reneging
(#204 addressing #200).from and from_to +
documentation update (75a9569).handle_unfinished() activity sets a drop-out
trajectory for unfinished arrivals, i.e., those dropped from a resource
(due to preemption, resource shrinkage or a rejected seize)
or those that leave a trajectory (#178 addressing
#177).release_all() and
release_selected_all() activities automatically retrieve
the amount of resources seized and release it (#180 addressing
#25).get_seized() and get_seized_selected()
getters allow an arrival to retrieve the amount of resources seized
(#180 addressing #179).stop_if() activity sets a conditional breakpoint
(#181 addressing #100).Queueing Systems vignette with a section
about state-dependent service rates.get_selected() retrieves names of selected
resources via the select() activity (#172 addressing
#171).Simulator interface for adding processes
and resources (#162). The responsibility of building the objects has
been moved to the caller.add_global() method to attach global attributes to
a simulation environment (#174 addressing #158).get_global() to work outside trajectories (#170
addressing #165).rollback() with an infinite amount (#173).reset() to avoid overwriting the simulation
environment (#175).get_sources() and get_resources() retrieve
a character vector of source/resource names defined in a simulation
environment.get_trajectory() retrieves a trajectory to which a
given source is attached.shortest-queue-available,
round-robin-available, random-available
(#156). These are the same as the existing non-available
ones, but they exclude unavailable resources (capacity set to zero).
Thus, if all resources are unavailable, an error is raised.-DRCPP_PROTECTED_EVAL (Rcpp >= 0.12.17.4) as
-DRCPP_USE_UNWIND_PROTECT (6d27671).-DBOOST_NO_AUTO_PTR
(70328b6).log_ print (7c2e3b1).when_activated() convenience function to easily
generate arrivals on demand from trajectories (#161 closing #160).schedule printing (9c66285).set_attribute(global=TRUE),
get_attribute(global=TRUE) and
timeout_from_attribute(global=TRUE) (#164), the
*_global versions should be used instead.simmer license has been changed to GPL >=
2.inst/include (#147 closing #145). Therefore, from now on it
is possible to extend the C++ API from another package by listing
simmer under the LinkingTo field in the
DESCRIPTION file.monitor constructor enables the development
of new monitoring backends in other packages (179f656, as part of
#147).log_ activity
has a new argument level which determines whether the
message is printed depending on a global log_level defined
in the simmer constructor (#152).set_attribute and set_global gain a new
argument to automatically initialise new attributes (#157). Useful to
update counters and indexes in a single line, without initialisation
boilerplate.-DRCPP_PROTECTED_EVAL (Rcpp >= 0.12.17.3),
which provides fast evaluation of R expressions by leveraging the new
stack unwinding protection API (R >= 3.5.0).ostream method
(2b2f43e).rlang and purrr
(#154).add_dataframe enables the attachment of
precomputed data, in the form of a data frame, to a trajectory. It can
be used instead of (or along with) add_generator. The most
notable advantage over the latter is that add_dataframe is
able to automatically set attributes and prioritisation values per
arrival based on columns of the provided data frame (#140 closing
#123).set_source activity deprecates
set_distribution(). It works both for generators and data
sources (275a09c, as part of #140).simmer() constructor gains a new argument mon
to provide different types of monitors. By default, monitoring is
performed in-memory, as usual. Additionally, monitoring can be offloaded
to disk through monitor_delim and monitor_csv,
which produce flat delimited files. But more importantly, the C++
interface has been refactorised to enable the development of new
monitoring backends (#146 closing #119).until=Inf for the run method
(3e6aae9, as part of #140).branch and clone now accept lists of
trajectories, in the same way as join, so that there is no
need to use do.call (#142).continue (present in seize
and branch) is recycled if only one value is provided but
several sub-trajectories are defined (#143).timeout_from_attribute() activity makes it easier
to set a timeout based on an attribute (#129).set_attribute(),
set_prioritization(), set_capacity() and
set_queue_size() get a new argument mod which,
if set to "+" or "*", modifies the
corresponding value instead of substituting it. This makes it easier to
increment, decrement or scale one of these values (#130).*_selected() versions for the already available
resource getters: get_capacity(),
get_queue seize(), get_server_count() and
get_queue_count() (#134).trap() after a
send() (#135).create_trajectory()
and onestep() (#117).get_mon_resources()’s data
argument. It was there for historical reasons and probably nobody was
using it (851d34b).set_attribute() (and set_global() by
extension) can set multiple attributes at once by providing vectors of
keys and values (or functions returning such
keys and/or values).
get_attribute() (and get_global() by
extension) can retrieve multiple keys (#122).stepn() method deprecates onestep()
(e452975).ostream after formatting (9ff11f8).set_capacity()
(#125).progress
callback in run() (#103).get_name() retrieves the arrival name.get_attribute() retrieves an attribute by name. The old
method of retrieving them by providing a function with one argument is
deprecated in favour of get_attribute(), and will be
removed in version 3.7.x.get_prioritization() retrieves the three prioritization
values (priority, preemptible,
restart) of the active arrival.set_global() and get_global(), equivalent to
set_attribute(global=TRUE) and
get_attribute(global=TRUE) respectively.Rcpp::DataFrame instead of Rcpp::List
(#104).make_resetable()
(c596f73).trap()’s handler cloning and associated test
(#91).select()’s policy also when
resources is a function (#92).rollback()’s default behaviour to
times=Inf, i.e., infinite loop (#95).timeout() returns a
missing value (#96 and #97).[<- and
[[<- (#88).rep() S3 method for trajectories
(7fa515e).simmer.plot package (on CRAN) already covers these
features among others.Suggests are not
installed (e40e5b6).every parameter to the from_to()
convenience function (9d68887).[ and [[, for
trajectories (1847898). Think about trajectories as lists of activities
and these operators will do (almost) everything you expect. As a side
effect, the generics head() and tail()
automatically work with trajectories also as expected.length() method to obtain the number of first-level
activities in a trajectory (f86375a). Useful in combination with the
subsetting operators.create_trajectory() has been deprecated in favor of
trajectory() (76c1317).plot_resource_usage(),
plot_resource_utilization(),
plot_evolution_arrival_times() and
plot_attributes() have been deprecated and will be removed
in the next release in order to minimise dependencies (5b43f2b). We plan
to release a new package on CRAN covering these features and new
ones.get_head(), get_tail(),
print_activity(), get_next_activity(),
get_prev_activity() (f86375a). These methods were only
useful for development purposes and nobody should be using them. And it
was never a good idea to directly expose external pointers.renege_if() activity triggers reneging upon
reception of a signal broadcasted with send() (#84).trap()
(bb2aa46).set_attribute()
(#82).set_queue_size() with
queue_size_strict=TRUE: arrivals were not being dropped
(#83).set_capacity() with a preemptive resource
when the old value was Inf: arrivals were not being
preempted (63beb2c).trap() printed information.set_capacity() and set_queue_size() become
activities (#77). Just like seize() and
release(), they have the associated
set_capacity_selected() and
set_queue_size_selected() for a joint use together with
select().activate() and deactivate() activities
allow an arrival to start or stop a generator, respectively, from inside
a trajectory (#80).set_trajectory() and
set_distribution() activities allow an arrival to install a
new trajectory or distribution, respectively, in a generator from inside
a trajectory (#80).send(), trap(),
untrap() and wait() can be used to send
signals, wait for signals, trap them and launch asynchronous
handlers.log_() activity simply prints messages for
debugging purposes (eaa4554).seize() and
seize_selected() (1c8c3bb).get_mon_arrivals(ongoing = TRUE) (#73).as<>()
calls (ec4e51a).run(until) runs the simulation exactly until
until, instead of until the first event scheduled at a time
>= until (e7264f6).priority, preemptible,
restart) has been moved from seize() to
add_generator() (#69). This leads to a more natural
interpretation of prioritization values as attributes of arrivals from
the same generator, rather than attributes of a seize().
Still, prioritization values can be redefined dynamically from inside a
trajectory with the new activity set_prioritization().post.seize and reject
sub-trajectories in seize() and
seize_selected() (#49). This feature allows us to fine-tune
what happens to an arrival if it cannot seize a resource: instead of
getting dropped, it may execute a given sub-trajectory.clone() and synchronize() activities
(#71). clone() implements the workflow pattern in which an
entity is processed in multiple parallel threads. The user can define a
different sub-trajectory for each clone. With
synchronize(), multiple parallel clones converge and are
synchronized: only one continues (the first or the last to arrive), and
the others are removed.batch() and separate() activities
(#45). They can be used to implement a rollercoaster process:
batch() collects a number of arrivals before they can
continue processing as a block, and separate() splits a
previousl established batch.renege_in() and renege_abort()
activities (#58). They can be used to set or unset a timer after which
the arrival will abandon.branch()’s option returns
0, the arrival skips the branch() and
continues to the next activity instead of throwing an
index out of range error (#70).every() (#65)
and branch()’s deprecated argument merge
(#57).join() activity to concatenate trajectories
(#50).queue_size_strict to
add_resource() to guarantee the queue size limit with
preemption (#59).select(), seize_selected() and
release_selected() activities (#52).leave() activity (#63).end_time - start_time. All versions 3.2.x are affected by
this bug.preemptible in the documentation
of seize() and force preemptible to be equal
or greater than priority (#53).branch()’s merge parameter name to
continue. The old name is deprecated (#57).match.arg() in multiple-choice arguments
(#55).branch() backwards linking and count (#56).release() in two steps to deal properly with
capacity changes at the same point in time (#64).every() is deprecated due to
#65.capacity and queue_size can change
over time following a user-defined scheduling, which can be generated
with the new function schedule().?peek.plot_resource_usage()
(8da9b97).merge=TRUE (#46).until=Inf is allowed now (f47baa9).t=3, queue=2 meant that, until t=3, the queue
had 2 customers, and at t=3 the system changed (because of
a new arrival or a new departure). The idea was to keep the values and
time vectors aligned (see #28). But from this moment on, the resources
are monitored after changing the status of the system.
This is more consistent with what a user would expect, and more
consistent with the behaviour of other related R functions (e.g., see
stepfun(), from the stats package). Wrapping
up and from now on, t=3, queue=2 means that some event
happened at t=3 whose immediate and subsequent result was a
queue with 2 customers.preemptive=TRUE. Arrivals in the
server can be preempted on a preempt_order="fifo" or
preempt_order="lifo" basis. Each seize() has
three basic properties:
priority: already present in previous versions.preemptible: another seize() with a
priority value greater than this may preempt the present
seize().restart: whether the current task (a
timeout() activity, for instance) should be restarted if
the arrival is preempted.show_activity() and
show_trajectory().every(), to() and
from_to() convenience functions (8e524cd).plot_resource_usage()
(6b034a7).testthat
(#41).branch() activity now provides attributes to its
option function, as the other activities (#42).plot_*() functions
(#44).get_mon_arrivals() returned the
start/activity/end times per arrival for the whole trajectory. This
behaviour remains, but additionally,
get_mon_arrivals(per_resource = TRUE) returns these times
per resource, so that it is possible to retrieve queueing/system times
per resource.get_mon_*() functions accept a single simulation
environment as well as a list of environments representing several
replications (5ee2725). A new column (replication) in the
resulting data frame indicates the corresponding replication
number.set_attribute()
activity (#16).rollback() activity (#17 and #22).self visibly, instead of invisibly (#35).at() and from() convenience functions
(29cccd2 and 7cfdd90).add_skip_event() function
to implement a more flexible and user-friendly branching method.n arrivals beforehand, this release leverages the concept
of generator of arrivals, which is faster and more flexible. At
the same time, the concept of trajectory as a chain of
activities is implemented entirely in C++ internally. Our tests show
that simmer is even faster than SimPy when it comes to simulate queueing
networks.These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.