Class: Forkme
Direct Known Subclasses
Constant Summary collapse
- @@children =
class variable holding all the children
Children.new
Instance Attribute Summary collapse
-
#child_count ⇒ Object
readonly
Returns the value of attribute child_count.
-
#max_forks ⇒ Object
writeonly
Sets the attribute max_forks.
-
#on_child_exit_blk ⇒ Object
writeonly
Sets the attribute on_child_exit_blk.
-
#on_child_start_blk ⇒ Object
writeonly
Sets the attribute on_child_start_blk.
-
#suppress_exceptions ⇒ Object
Returns the value of attribute suppress_exceptions.
Class Method Summary collapse
- .logger ⇒ Object
- .logger=(log_meth) ⇒ Object
- .start(forks_to_run, suppress_exceptions = false, log_method = DefaultLogger, &block) ⇒ Object
Instance Method Summary collapse
-
#initialize(forks_to_run, suppress_exceptions = false, log_method = DefaultLogger) ⇒ Forkme
constructor
A new instance of Forkme.
-
#interrupt ⇒ Object
Sends the TERM signal to all child processes via their pids.
-
#on_child_exit(&block) ⇒ Object
A block to be executed upon exiting a child process.
-
#on_child_start(&block) ⇒ Object
A block to be executed just before calling the block a child will be executing.
-
#start(&block) ⇒ Object
Starts the child processes, the number of which is determined by the @max_forks variable.
-
#stop ⇒ Object
sets the @flag to :exit_loop, essentially stopping the parent and child processes since the loop will die and all children will receive the close() call.
-
#terminate ⇒ Object
Calls the close method on each child which sets its status to :closed.
Methods included from DefaultLogger
Constructor Details
#initialize(forks_to_run, suppress_exceptions = false, log_method = DefaultLogger) ⇒ Forkme
Returns a new instance of Forkme.
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# File 'lib/forkme/forkme.rb', line 23 def initialize(forks_to_run, suppress_exceptions = false, log_method = DefaultLogger) @min_forks = 1 @max_forks = forks_to_run @suppress_exceptions = suppress_exceptions Forkme.logger = log_method end |
Instance Attribute Details
#child_count ⇒ Object (readonly)
Returns the value of attribute child_count.
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# File 'lib/forkme/forkme.rb', line 3 def child_count @child_count end |
#max_forks=(value) ⇒ Object (writeonly)
Sets the attribute max_forks
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# File 'lib/forkme/forkme.rb', line 5 def max_forks=(value) @max_forks = value end |
#on_child_exit_blk=(value) ⇒ Object (writeonly)
Sets the attribute on_child_exit_blk
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# File 'lib/forkme/forkme.rb', line 5 def on_child_exit_blk=(value) @on_child_exit_blk = value end |
#on_child_start_blk=(value) ⇒ Object (writeonly)
Sets the attribute on_child_start_blk
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# File 'lib/forkme/forkme.rb', line 5 def on_child_start_blk=(value) @on_child_start_blk = value end |
#suppress_exceptions ⇒ Object
Returns the value of attribute suppress_exceptions.
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# File 'lib/forkme/forkme.rb', line 4 def suppress_exceptions @suppress_exceptions end |
Class Method Details
.logger ⇒ Object
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# File 'lib/forkme/forkme.rb', line 10 def logger @logger end |
.logger=(log_meth) ⇒ Object
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# File 'lib/forkme/forkme.rb', line 14 def logger=(log_meth) @logger = log_meth end |
.start(forks_to_run, suppress_exceptions = false, log_method = DefaultLogger, &block) ⇒ Object
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# File 'lib/forkme/forkme.rb', line 19 def self.start(forks_to_run, suppress_exceptions = false, log_method = DefaultLogger, &block) self.new(forks_to_run, suppress_exceptions, log_method).start(block) end |
Instance Method Details
#interrupt ⇒ Object
Sends the TERM signal to all child processes via their pids
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# File 'lib/forkme/forkme.rb', line 109 def interrupt() Process.kill "TERM", *(@@children.pids) rescue nil end |
#on_child_exit(&block) ⇒ Object
A block to be executed upon exiting a child process.
- block
-
block The block that will be executed upon termination of a child process
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# File 'lib/forkme/forkme.rb', line 45 def on_child_exit(&block) raise "block required" unless block_given? @on_child_exit_blk = block end |
#on_child_start(&block) ⇒ Object
A block to be executed just before calling the block a child will be executing
- block
-
block The block that will be executed
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# File 'lib/forkme/forkme.rb', line 37 def on_child_start(&block) raise "block required" unless block_given? @on_child_start_blk = block end |
#start(&block) ⇒ Object
Starts the child processes, the number of which is determined by the @max_forks variable
- block
-
&block The block that will be executed by the child processes
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# File 'lib/forkme/forkme.rb', line 53 def start(&block) raise "block required" unless block_given? (@min_forks - @@children.size).times do make_child block end @flag = :in_loop while @flag == :in_loop do log = false r, = IO.select(@@children.fds, nil, nil, 1) if r then log = true r.each do |f| c = @@children.by_fd f c.event f.gets end end as = @@children.active.size @@children.cleanup if @@children.size > as break if @flag != :in_loop n = 0 if as < @min_forks then n = @min_forks - as else if @@children.idle.size <= 2 then n = 2 end end if as + n > @max_forks then n = @max_forks - as end #Forkme.logger.debug "p: max:#{@max_forks}, min:#{@min_forks}, cur:#{as}, idle:#{@@children.idle.size}: new:#{n}" if n > 0 or log n.times do make_child block end end @flag = :out_of_loop terminate end |
#stop ⇒ Object
sets the @flag to :exit_loop, essentially stopping the parent and child processes since the loop will die and all children will receive the close() call
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# File 'lib/forkme/forkme.rb', line 95 def stop() @flag = :exit_loop terminate end |
#terminate ⇒ Object
Calls the close method on each child which sets its status to :closed
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# File 'lib/forkme/forkme.rb', line 101 def terminate() raise "Cannot terminate while still in the loop" if @flag == :in_loop @@children.each do |c| c.close end end |