1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
##
## this is part of the logging package. the logging package is free
## software: you can redistribute it as well as modify it under the terms of
## the GNU General Public License as published by the Free Software
## Foundation, either version 3 of the License, or (at your option) any later
## version.
##
## this program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with the nens libraray. If not, see http://www.gnu.org/licenses/.
##
## Copyright (c) 2009..2013 by Mario Frasca
##
Logger <- setRefClass(
"Logger",
fields = list(
name = "character",
handlers = "list",
level = "numeric",
msg_composer = "function"),
methods = list(
getParent = function() {
# split the name on the '.'
parts <- unlist(strsplit(name, ".", fixed = TRUE))
removed <- parts[-length(parts)] # except the last item
parent_name <- paste(removed, collapse = ".")
return(getLogger(parent_name))
},
getMsgComposer = function() {
if (!is.null(msg_composer) && !is.null(functionBody(msg_composer))) {
return(msg_composer)
}
if (name != "") {
parent_logger <- getParent()
return(parent_logger$getMsgComposer())
}
return(defaultMsgCompose)
},
setMsgComposer = function(composer_f) {
if (!is.function(composer_f)
|| paste(formalArgs(composer_f), collapse = ", ") != "msg, ...") {
stop(paste("message composer(passed as composer_f) must be function",
" with signature function(msg, ...)"))
}
msg_composer <<- composer_f
},
.deducelevel = function(initial_level = loglevels[["NOTSET"]]) {
if (initial_level != loglevels[["NOTSET"]]) {
# it's proper level (set: Not for inheritance)
return(initial_level)
}
if (level != loglevels[["NOTSET"]]) {
return(level)
}
if (name == "") {
# assume it's FINEST, as root logger cannot inherit
return(loglevels[["FINEST"]])
}
# ask parent for level
parent_logger <- getParent()
return(parent_logger$.deducelevel())
},
.logrecord = function(record) {
logger_level <- .deducelevel(level)
if (record$level >= logger_level) {
for (handler in handlers) {
handler_level <- .deducelevel(with(handler, level))
if (record$level >= handler_level) {
action <- with(handler, action)
formatter <- with(handler, formatter)
action(formatter(record), handler, record)
}
}
}
if (name != "") {
parent_logger <- getParent()
parent_logger$.logrecord(record)
}
invisible(TRUE)
},
log = function(msglevel, msg, ...) {
msglevel <- namedLevel(msglevel)
if (msglevel < level) {
return(invisible(FALSE))
}
## fine, we create the record and pass it to all handlers attached to the
## loggers from here up to the root.
record <- list()
composer_f <- getMsgComposer()
record$msg <- composer_f(msg, ...)
record$timestamp <- sprintf("%s", Sys.time())
record$logger <- name
record$level <- msglevel
record$levelname <- names(which(loglevels == record$level)[1])
## cascade action in private method.
.logrecord(record)
},
setLevel = function(new_level) {
new_level <- namedLevel(new_level)
level <<- new_level
},
getLevel = function() level,
getHandler = function(handler) {
if (!is.character(handler))
handler <- deparse(substitute(handler))
handlers[[handler]]
},
removeHandler = function(handler) {
if (!is.character(handler)) # handler was passed as its action
handler <- deparse(substitute(handler))
handlers <<- handlers[!(names(handlers) == handler)]
},
addHandler = function(handler, ..., level = 0, formatter = defaultFormat) {
handler_env <- new.env()
if (is.character(handler)) {
## first parameter is handler name
handler_name <- handler
## and hopefully action is in the dots
params <- list(...)
if ("action" %in% names(params)) {
the_action <- params[["action"]]
} else if (length(params) > 0 && is.null(names(params)[[1]])) {
the_action <- params[[1]]
} else {
stop("No action for the handler provided")
}
assign("action", the_action, handler_env)
} else {
## first parameter is handler action, from which we extract the name
updateOptions.environment(handler_env, action = handler)
handler_name <- deparse(substitute(handler))
}
updateOptions.environment(handler_env, ...)
assign("level", namedLevel(level), handler_env)
assign("formatter", formatter, handler_env)
removeHandler(handler_name)
if (with(handler_env, action)(NA, handler_env, dry = TRUE) == TRUE) {
handlers[[handler_name]] <<- handler_env
}
},
finest = function(...) log(loglevels["FINEST"], ...),
finer = function(...) log(loglevels["FINER"], ...),
fine = function(...) log(loglevels["FINE"], ...),
debug = function(...) log(loglevels["DEBUG"], ...),
info = function(...) log(loglevels["INFO"], ...),
warn = function(...) log(loglevels["WARN"], ...),
error = function(...) log(loglevels["ERROR"], ...)
) # methods
) # setRefClass
|
