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|
##
## see NAMESPACE section for definitive exports
##
## Manager class
.TaskManager <- setClass("TaskManager", contains = "environment")
## server
setGeneric(
".send_to",
function(backend, node, value) standardGeneric(".send_to"),
signature = "backend"
)
setGeneric(
".recv_any",
function(backend) standardGeneric(".recv_any"),
signature = "backend"
)
setGeneric(
".send_all",
function(backend, value) standardGeneric(".send_all"),
signature = "backend"
)
setGeneric(
".recv_all",
function(backend) standardGeneric(".recv_all"),
signature = "backend"
)
## client
setGeneric(
".send",
function(worker, value) standardGeneric(".send"),
signature = "worker"
)
setGeneric(
".recv",
function(worker) standardGeneric(".recv"),
signature = "worker"
)
setGeneric(
".close",
function(worker) standardGeneric(".close"),
signature = "worker"
)
## task manager
setGeneric(
".manager",
function(BPPARAM) standardGeneric(".manager"),
signature = "BPPARAM"
)
setGeneric(
".manager_send",
function(manager, value, ...) standardGeneric(".manager_send"),
signature = "manager"
)
setGeneric(
".manager_recv",
function(manager) standardGeneric(".manager_recv"),
signature = "manager"
)
setGeneric(
".manager_send_all",
function(manager, value) standardGeneric(".manager_send_all"),
signature = "manager"
)
setGeneric(
".manager_recv_all",
function(manager) standardGeneric(".manager_recv_all"),
signature = "manager"
)
setGeneric(
".manager_capacity",
function(manager) standardGeneric(".manager_capacity"),
signature = "manager"
)
setGeneric(
".manager_flush",
function(manager) standardGeneric(".manager_flush"),
signature = "manager"
)
setGeneric(
".manager_cleanup",
function(manager) standardGeneric(".manager_cleanup"),
signature = "manager"
)
## default implementation -- SNOW backend
setMethod(
".send_all", "ANY",
function(backend, value)
{
for (node in seq_along(backend))
.send_to(backend, node, value)
})
setMethod(
".recv_all", "ANY",
function(backend)
{
replicate(length(backend), .recv_any(backend), simplify=FALSE)
})
setMethod(
".send_to", "ANY",
function(backend, node, value)
{
parallel:::sendData(backend[[node]], value)
TRUE
})
setMethod(
".recv_any", "ANY",
function(backend)
{
tryCatch({
parallel:::recvOneData(backend)
}, error = function(e) {
## indicate error, but do not stop
.error_worker_comm(e, "'.recv_any()' data failed")
})
})
setMethod(
".send", "ANY",
function(worker, value)
{
parallel:::sendData(worker, value)
})
setMethod(
".recv", "ANY",
function(worker)
{
tryCatch({
parallel:::recvData(worker)
}, error = function(e) {
## indicate error, but do not stop
.error_worker_comm(e, "'.recv()' data failed")
})
})
setMethod(
".close", "ANY",
function(worker)
{
parallel:::closeNode(worker)
})
setMethod(
".close", "ANY",
function(worker)
{
parallel:::closeNode(worker)
})
## default task manager implementation
##
## define as plain function for re-use without method dispatch
.manager_ANY <-
function(BPPARAM)
{
manager <- .TaskManager()
manager$BPPARAM <- BPPARAM
manager$backend <- bpbackend(BPPARAM)
manager$capacity <- length(manager$backend)
availability <- rep(list(TRUE), manager$capacity)
names(availability) <- as.character(seq_along(manager$backend))
manager$availability <- as.environment(availability)
manager
}
setMethod(".manager", "ANY", .manager_ANY)
setMethod(
".manager_send", "ANY",
function(manager, value, ...)
{
availability <- manager$availability
stopifnot(length(availability) >=0)
## send the job to the next available worker
worker <- names(availability)[1]
.send_to(manager$backend, as.integer(worker), value)
rm(list = worker, envir = availability)
})
setMethod(
".manager_recv", "ANY",
function(manager)
{
result <- .recv_any(manager$backend)
manager$availability[[as.character(result$node)]] <- TRUE
list(result)
})
setMethod(
".manager_send_all", "ANY",
function(manager, value) .send_all(manager$backend, value)
)
setMethod(
".manager_recv_all", "ANY",
function(manager) .recv_all(manager$backend)
)
setMethod(
".manager_capacity", "ANY",
function(manager)
{
manager$capacity
})
setMethod(
".manager_flush", "ANY",
function(manager) manager
)
setMethod(
".manager_cleanup", "ANY",
function(manager) manager
)
|
