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TaskManager.rb
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TaskManager.rb
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# Copyright (C) 2021 hidenorly
#
# 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.
# TaskManager and Task definitions
class Task
attr_accessor :description
def initialize(description)
@description = description
end
def execute
end
end
class TaskManager
def initialize()
@tasks = []
end
def addTask(aTask)
@tasks.push( aTask )
end
def executeAll
while [email protected]? do
aTask = @tasks.pop()
aTask.execute()
end
end
end
# --- TaskAsync and TaskManagerAsync -------------
class TaskAsync < Task
attr_accessor :description
attr_accessor :taskCompleCallback
attr_accessor :running
def initialize(description)
super( description )
@running = false
@taskCompleCallback = nil
end
def execute
_doneTask()
end
def finalize
@running = false
end
def _doneTask
if nil != @taskCompleCallback then
@taskCompleCallback.call(self) # completion callback
end
end
end
class TaskManagerAsync < TaskManager
def initialize( numOfThread = TaskManagerAsync.getNumberOfProcessor() )
@tasks = []
@numOfThread = numOfThread
@currentRunningTasks = 0
@threads = []
@criticalSection = Mutex.new
end
def addTask(aTaskAsync)
aTaskAsync.taskCompleCallback = method(:_onTaskCompletion)
@criticalSection.synchronize {
super( aTaskAsync )
}
end
def cancelTask( aTask )
# @tasks.delete( aTask )
@criticalSection.synchronize {
@currentRunningTasks = @currentRunningTasks - 1
}
aTask.running = false
aTask.finalize()
end
def executeAll
candidateTasks = []
@criticalSection.synchronize {
for aTask in @tasks do
if( false == aTask.running ) then
if ( @currentRunningTasks < @numOfThread ) then
@currentRunningTasks = @currentRunningTasks + 1
aTask.running = true
candidateTasks.push( aTask )
end
end
end
for aTask in candidateTasks do
@tasks.delete( aTask )
end
}
for aTask in candidateTasks do
@threads << Thread.new(aTask) do |task|
task.execute()
end
end
end
def isRunning
@criticalSection.synchronize {
if @currentRunningTasks > 0 then return true end
}
return false
end
def isRemainingTasks
@criticalSection.synchronize {
if @tasks.count > 0 then return true end
}
return false
end
def _onTaskCompletion( task )
# puts "done : #{task.description}"
cancelTask( task )
executeAll()
end
def finalize
while isRemainingTasks() || isRunning() do
if ( isRunning() ) then
sleep 0.1
# puts "waiting ... done #{@currentRunningTasks}"
@threads.each { |t| t.join }
end
end
end
def self.getNumberOfProcessor
# try as Windows
numOfProcessor = ENV['NUMBER_OF_PROCESSORS']
if !numOfProcessor then
# try as Linux
exec_cmd = "cat /proc/cpuinfo 2> /dev/null | grep bogomips | wc -l"
IO.popen(exec_cmd, "r") {|io|
while !io.eof? do
numOfProcessor= io.readline.strip.to_i
end
io.close()
}
end
if !numOfProcessor || 0 == numOfProcessor then
# try as MacOS
exec_cmd = "sysctl -n hw.ncpu 2> /dev/null"
IO.popen(exec_cmd, "r") {|io|
while !io.eof? do
numOfProcessor= io.readline.strip.to_i
end
io.close()
}
end
numOfProcessor=4 if !numOfProcessor || 0 == numOfProcessor
return numOfProcessor
end
end