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#
# Copyright (c) Microsoft. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
callCombine <- function(obj, status) {
if (obj$combineInfo$in.order) {
repeat {
needed <- obj$combineInfo$max.combine
if (!obj$state$first.time)
needed <- needed - 1
n <- which(is.na(obj$state$buffered))[1] - 1L
stopifnot(!is.na(n))
n <- min(n, needed)
if (n == needed || (status && n > 0)) {
# get the names of the objects to be combined
ind <- 1:n
# filter out any errors (if error handling isn't 'pass')
b <- obj$state$buffered[ind]
allsyms <- paste('result', abs(b), sep='.')
args <- b[b > 0]
args <- if (length(args) > 0)
paste('result', args, sep='.')
else
character(0)
# XXX these operations won't be efficient for small values of max.combine
blen <- length(obj$state$buffered)
obj$state$buffered <- obj$state$buffered[(n+1):blen]
length(obj$state$buffered) <- blen # XXX put this off?
obj$state$buf.off <- obj$state$buf.off + n
# create the call object to call the combine function
callobj <- if (obj$state$first.time) {
if (length(args) > 0) {
if (obj$verbose)
cat('first call to combine function\n') # not always true
obj$state$first.time <- FALSE
if (length(args) > 1)
as.call(lapply(c('fun', args), as.name))
else
as.name(args) # this evaluates to the value of the result
} else {
if (obj$verbose)
cat('not calling combine function due to errors\n')
NULL
}
} else {
if (length(args) > 0) {
if (obj$verbose)
cat('calling combine function\n')
as.call(lapply(c('fun', 'accum', args), as.name))
} else {
if (obj$verbose)
cat('not calling combine function due to errors\n')
NULL
}
}
# call the combine function
if (!is.null(callobj)) {
if (obj$verbose) {
cat('evaluating call object to combine results:\n ')
print(callobj)
}
obj$state$accum <- eval(callobj, obj$state)
}
# remove objects from buffer cache that we just processed
# and all error objects
remove(list=allsyms, pos=obj$state)
} else {
break
}
}
} else {
needed <- obj$combineInfo$max.combine
if (!obj$state$first.time)
needed <- needed - 1
stopifnot(obj$state$nbuf <= needed)
# check if it's time to combine
if (obj$state$nbuf == needed || (status && obj$state$nbuf > 0)) {
# get the names of the objects to be combined
ind <- 1:obj$state$nbuf
# filter out any errors (if error handling isn't 'pass')
b <- obj$state$buffered[ind]
allsyms <- paste('result', abs(b), sep='.')
args <- b[b > 0]
args <- if (length(args) > 0)
paste('result', args, sep='.')
else
character(0)
obj$state$buffered[ind] <- as.integer(NA)
obj$state$nbuf <- 0L
# create the call object to call the combine function
callobj <- if (obj$state$first.time) {
if (length(args) > 0) {
if (obj$verbose)
cat('first call to combine function\n')
obj$state$first.time <- FALSE
if (length(args) > 1)
as.call(lapply(c('fun', args), as.name))
else
as.name(args) # this evaluates to the value of the result
} else {
if (obj$verbose)
cat('not calling combine function due to errors\n')
NULL
}
} else {
if (length(args) > 0) {
if (obj$verbose)
cat('calling combine function\n')
as.call(lapply(c('fun', 'accum', args), as.name))
} else {
if (obj$verbose)
cat('not calling combine function due to errors\n')
NULL
}
}
# call the combine function
if (!is.null(callobj)) {
if (obj$verbose) {
cat('evaluating call object to combine results:\n ')
print(callobj)
}
obj$state$accum <- eval(callobj, obj$state)
}
# remove objects from buffer cache that we just processed
remove(list=allsyms, pos=obj$state)
}
}
}
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