Class: RQ::JobQueue

Inherits:
Object
  • Object
show all
Includes:
Logging, Util
Defined in:
lib/rq/jobqueue.rb

Overview

the JobQueue class is responsible for high level access to the job queue

Defined Under Namespace

Classes: Error

Constant Summary collapse

MAX_JID = 
2 ** 20

Constants included from Logging

Logging::DIV0, Logging::DIV1, Logging::DIV2, Logging::DIV3, Logging::EOL, Logging::SEC0, Logging::SEC1, Logging::SEC2, Logging::SEC3

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Util

#alive?, append_features, #btrace, #columnize, #defval, #emsg, #erreq, #errmsg, #escape, #escape!, #exec, export, #fork, #getopt, #hashify, #hms, #host, #hostname, #klass, #maim, #mcp, #realpath, #stamptime, #system, #timestamp, #tmpnam, #uncache, #which_ruby

Methods included from Logging

append_features

Methods included from Logging::LogMethods

#debug, #error, #fatal, #info, #logerr, #logger, #logger=, #warn

Constructor Details

#initialize(path, opts = {}) ⇒ JobQueue

Returns a new instance of JobQueue.



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# File 'lib/rq/jobqueue.rb', line 57

def initialize path, opts = {}
#--{{{
  @path = path # do NOT expand this or it'll be fubar from misc nfs mounts!!
  @bin = File::join @path, 'bin' 
  @stdin = File::join @path, 'stdin' 
  @stdout = File::join @path, 'stdout' 
  @stderr = File::join @path, 'stderr' 
  @data = File::join @path, 'data' 
  @opts = opts
  raise "q <#{ @path }> does not exist" unless test ?e, @path
  raise "q <#{ @path }> is not a directory" unless test ?d, @path
  @basename = File::basename(@path)
  @dirname = File::dirname(@path)
  @logger = getopt('logger', opts) || Logger::new(STDERR)
  @qdb = getopt('qdb', opts) || QDB::new(File::join(@path, 'db'), 'logger' => @logger)
  @in_transaction = false
  @in_ro_transaction = false
#--}}}
end

Instance Attribute Details

#bin ⇒ Object (readonly)

Returns the value of attribute bin.



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# File 'lib/rq/jobqueue.rb', line 48

def bin
  @bin
end

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/rq/jobqueue.rb', line 52

def data
  @data
end

#opts ⇒ Object (readonly)

Returns the value of attribute opts.



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# File 'lib/rq/jobqueue.rb', line 53

def opts
  @opts
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/rq/jobqueue.rb', line 47

def path
  @path
end

#qdb ⇒ Object (readonly) Also known as: db

Returns the value of attribute qdb.



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# File 'lib/rq/jobqueue.rb', line 54

def qdb
  @qdb
end

#stderr ⇒ Object (readonly)

Returns the value of attribute stderr.



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# File 'lib/rq/jobqueue.rb', line 51

def stderr
  @stderr
end

#stdin ⇒ Object (readonly)

Returns the value of attribute stdin.



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# File 'lib/rq/jobqueue.rb', line 49

def stdin
  @stdin
end

#stdout ⇒ Object (readonly)

Returns the value of attribute stdout.



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# File 'lib/rq/jobqueue.rb', line 50

def stdout
  @stdout
end

Class Method Details

.create(path, opts = {}) ⇒ Object

–{{{



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# File 'lib/rq/jobqueue.rb', line 28

def create path, opts = {}
#--{{{
  FileUtils::rm_rf path
  FileUtils::mkdir_p path
  db = File::join path, 'db'
  qdb = QDB.create db, opts
  opts['qdb'] = qdb
  q = new path, opts
  FileUtils::mkdir_p q.bin
  FileUtils::mkdir_p q.stdin 
  FileUtils::mkdir_p q.stdout
  FileUtils::mkdir_p q.stderr
  FileUtils::mkdir_p q.data
  q
#--}}}
end

Instance Method Details

#[]=(key, value) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 916

def []= key, value
#--{{{
  sql = "select count(*) from attributes where key='#{ key }';"
  tuples = @qdb.execute sql
  tuple = tuples.first
  count = Integer tuple['count(*)']
  case count
    when 0
      sql = "insert into attributes values('#{ key }','#{ value }');"
      @qdb.execute sql
    when 1
      sql = "update attributes set key='#{ key }', value='#{ value }' where key='#{ key }';"
      @qdb.execute sql
    else
      raise "key <#{ key }> has become corrupt!"
  end
#--}}}
end

#abort_transaction(*a, &b) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 844

def abort_transaction(*a,&b)
#--{{{
  @qdb.abort_transaction(*a,&b)
#--}}}
end

#attributes ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 934

def attributes 
#--{{{
  h = {}
  tuples = @qdb.execute "select * from attributes;"
  tuples.map!{|t| h[t['key']] = t['value']}
  h
#--}}}
end

#data4(jid) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 106

def data4 jid
#--{{{
  "data/#{ jid }"
#--}}}
end

#data_4(jid) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 111

def data_4 jid
#--{{{
  File::expand_path(File::join(path, data4(jid)))
#--}}}
end

#delete(*args, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 531

def delete(*args, &block)
#--{{{
  whats, optargs = args.partition{|arg| not Hash === arg}

  opts = {}
  optargs.each{|oa| opts.update oa}

  force = Util::getopt 'force', opts

  delete_sql, select_sql = '', ''

  whats << 'all' if whats.empty?

  whats.each do |what|
    case "#{ what }"
      when %r/^\s*\d+\s*$/io # number
        delete_sql << "delete from jobs where jid=#{ what } and state!='running';\n"
        select_sql << "select * from jobs where jid=#{ what } and state!='running';\n"
      when %r/^\s*p/io # pending
        delete_sql << "delete from jobs where state='pending';\n"
        select_sql << "select * from jobs where state='pending';\n"
      when %r/^\s*h/io # holding
        delete_sql << "delete from jobs where state='holding';\n"
        select_sql << "select * from jobs where state='holding';\n"
      when %r/^\s*r/io # running
        delete_sql << "delete from jobs where state='running';\n" if force
        select_sql << "select * from jobs where state='running';\n" if force
      when %r/^\s*f/io # finished
        delete_sql << "delete from jobs where state='finished';\n"
        select_sql << "select * from jobs where state='finished';\n"
      when %r/^\s*d/io # dead
        delete_sql << "delete from jobs where state='dead';\n"
        select_sql << "select * from jobs where state='dead';\n"
      when %r/^\s*a/io # all
        delete_sql << "delete from jobs where state!='running';\n"
        select_sql << "select * from jobs where state!='running';\n"
      else
        raise ArgumentError, "cannot delete <#{ what.inspect }>"
    end
  end

  scrub = lambda do |jid|
    [standard_in_4(jid), standard_out_4(jid), standard_err_4(jid), data_4(jid)].each do |path| 
      FileUtils::rm_rf path
    end
  end

  tuples = []

  metablock = 
    if block
      lambda do |tuple|
        jid = tuple['jid']
        block[tuple]
        scrub[jid]
      end
    else
      lambda do |tuple|
        jid = tuple['jid']
        scrub[jid]
        tuples << tuple
      end
    end

# TODO - make file deletion transactional too

  transaction do
    execute(select_sql, &metablock)
    execute(delete_sql){}
  end

  delete_sql = nil
  select_sql = nil

  block ? nil : tuples
#--}}}
end

#execute(*args, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 824

def execute(*args, &block)
#--{{{
  @qdb.execute(*args, &block)
#--}}}
end

#getdeadjobs(started, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 762

def getdeadjobs(started, &block)
#--{{{
  ret = nil
  sql = <<-sql
    select * from jobs 
      where 
        state = 'running' and 
        runner='#{ Util::hostname }' and 
        started<='#{ started }'
  sql
  if block
    execute(sql, &block)
  else
    ret = execute(sql)
  end
  ret
#--}}}
end

#getjob ⇒ Object 



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# File 'lib/rq/jobqueue.rb', line 717

def getjob
#--{{{
  sql = <<-sql
    select * from jobs 
      where 
        (state='pending' or (state='dead' and (not restartable isnull))) and 
        (runner like '%#{ Util::host }%' or runner isnull)
      order by priority desc, submitted asc, jid asc
      limit 1;
  sql
  tuples = execute sql
  job = tuples.first
  job
#--}}}
end

#integrity_check(*args, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 829

def integrity_check(*args, &block)
#--{{{
  @qdb.integrity_check(*args, &block)
#--}}}
end

#jobisdead(job) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 780

def jobisdead job
#--{{{
  jid = job['jid']
  if jid
    sql = "update jobs set state='dead' where jid='#{ jid }'"
    execute(sql){}
  end
  job
#--}}}
end

#jobisdone(job) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 748

def jobisdone job
#--{{{
  sql = <<-sql
    update jobs 
      set
        state = '#{ job['state'] }',
        exit_status = '#{ job['exit_status'] }',
        finished = '#{ job['finished'] }',
        elapsed = '#{ job['elapsed'] }'
      where jid = #{ job['jid'] };
  sql
  execute sql
#--}}}
end

#jobisrunning(job) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 732

def jobisrunning job 
#--{{{
  sql = <<-sql
    update jobs 
      set
        pid='#{ job['pid'] }',
        state='#{ job['state'] }',
        started='#{ job['started'] }',
        runner='#{ job['runner'] }',
        stdout='#{ job['stdout'] }',
        stderr='#{ job['stderr'] }'
      where jid=#{ job['jid'] };
  sql
  execute sql
#--}}}
end

#list(*whats, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 281

def list(*whats, &block)
#--{{{
  ret = nil

  whats.replace(%w( pending running finished dead )) if 
    whats.empty? or whats.include?('all')
    
  whats.map! do |what|
    case what
      when %r/^\s*p/io
        'pending'
      when %r/^\s*h/io
        'holding'
      when %r/^\s*r/io
        'running'
      when %r/^\s*f/io
        'finished'
      when %r/^\s*d/io
        'dead'
      else
        what
    end
  end

  where_clauses = [] 

  whats.each do |what|
    case what
      when Numeric
        where_clauses << "jid=#{ what }\n"
      else
        what = "#{ what }"
        if what.to_s =~ %r/^\s*\d+\s*$/o
          where_clauses << "jid=#{ QDB::q what }\n"
        else
          where_clauses << "state=#{ QDB::q what }\n"
        end
    end
  end

  where_clause = where_clauses.join(" or \n")

  sql = <<-sql
    select * from jobs
    where #{ where_clause } 
  sql

  if block
    ro_transaction{ execute(sql, &block) }
  else
    ret = ro_transaction{ execute(sql) }
  end

  ret
#--}}}
end

#lock(*args, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 839

def lock(*args, &block)
#--{{{
  @qdb.lock(*args, &block)
#--}}}
end

#mtime ⇒ Object

TODO - use mtime to optimize checks by feeder??



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# File 'lib/rq/jobqueue.rb', line 911

def mtime
#--{{{
  File::stat(@path).mtime
#--}}}
end

#query(where_clause = nil, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 501

def query(where_clause = nil, &block)
#--{{{
  ret = nil

  sql = 
    if where_clause

    #
    # turn =~ into like clauses 
    #
      #where_clause.gsub!(/(=~\s*([^\s')(=]+))/om){q = $2.gsub(%r/'+|\s+/o,''); "like '%#{ q }%'"}
    #
    # quote everything on the rhs of an '=' sign - helps with shell problems...
    #
      #where_clause.gsub!(/(==?\s*([^\s')(=]+))/om){q = $2.gsub(%r/'+|\s+/o,''); "='#{ q }'"}

      "select * from jobs where #{ where_clause };"
    else
      "select * from jobs;"
    end

  if block
    ro_transaction{ execute(sql, &block) }
  else
    ret = ro_transaction{ execute(sql) }
  end

  ret
#--}}}
end

#recover!(*args, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 834

def recover!(*args, &block)
#--{{{
  @qdb.recover!(*args, &block)
#--}}}
end

#resubmit(*jobs, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 182

def resubmit(*jobs, &block)
#--{{{
  now = Util::timestamp Time::now

  transaction do
    jobs.each do |job|
      jid = Integer job['jid']
      command = job['command']
      stdin = job['stdin']
      data = job['data']

      raise "no jid for job <#{ job.inspect }>" unless jid 
      raise "no command for job <#{ job.inspect }>" unless command 

      tmp_stdin(stdin) do |ts|
        tuple = QDB::tuple

        tuple['jid']         = jid
        tuple['command']     = command
        tuple['priority']    = job['priority'] || 0
        tuple['tag']         = job['tag']
        tuple['runner']      = job['runner']
        tuple['restartable'] = job['restartable']
        tuple['state']       = 'pending'
        tuple['submitted']   = now
        tuple['submitter']   = Util::hostname
        tuple['stdin']       = stdin4 jid
        tuple['stdout']      = nil
        tuple['stderr']      = nil
        tuple['data']        = data4 jid

        kvs = tuple.fields[1..-1].map{|f| "#{ f }=#{ QDB::q(tuple[ f ]) }"}
        sql = "update jobs set #{ kvs.join ',' } where jid=#{ jid };\n"

        execute(sql){}

        FileUtils::rm_rf standard_in_4(jid)
        FileUtils::rm_rf standard_out_4(jid)
        FileUtils::rm_rf standard_err_4(jid)
        #FileUtils::rm_rf data_4(jid)
        FileUtils::cp ts.path, standard_in_4(jid) if ts
        if data
          FileUtils::mv data, data_4(jid)
        else
          FileUtils::mkdir_p data_4(jid)
        end

        if block
          sql = "select * from jobs where jid = '#{ jid }'"
          execute(sql, &block)
        end
      end # tmp_stdin
    end # jobs.each
  end # transaction
    
  self
#--}}}
end

#ro_transaction(*args) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 808

def ro_transaction(*args)
#--{{{
  ret = nil
  if @in_ro_transaction || @in_transaction
    ret = yield
  else
    begin
      @in_ro_transaction = true
      @qdb.ro_transaction(*args){ ret = yield }
    ensure
      @in_ro_transaction = false 
    end
  end
  ret
#--}}}
end

#rollback_transaction(*a, &b) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 849

def rollback_transaction(*a,&b)
#--{{{
  @qdb.rollback_transaction(*a,&b)
#--}}}
end

#snapshot(qtmp = "#{ @basename }.snapshot", retries = nil) ⇒ Object 



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# File 'lib/rq/jobqueue.rb', line 855

def snapshot qtmp = "#{ @basename }.snapshot", retries = nil 
#--{{{
  qtmp ||= "#{ @basename }.snapshot"
  debug{ "snapshot <#{ @path }> -> <#{ qtmp }>" }
  retries = Integer(retries || 16)
  debug{ "retries <#{ retries }>" }

  qss = nil
  loopno = 0

  take_snapshot = lambda do
    FileUtils::rm_rf qtmp
    FileUtils::mkdir_p qtmp
    %w(db db.schema lock).each do |base|
      src, dest = File::join(@path, base), File::join(qtmp, base)
      debug{ "cp <#{ src }> -> <#{ dest }>" }
      FileUtils::cp(src, dest)
    end
    ss = klass::new qtmp, @opts
    if ss.integrity_check
      ss
    else
      begin; recover! unless integrity_check; rescue; nil; end
      ss.recover!
    end
  end

  loop do
    break if loopno >= retries
    if((ss = take_snapshot.call))
      debug{ "snapshot <#{ qtmp }> created" }
      qss = ss
      break
    else
      debug{ "failure <#{ loopno + 1}> of <#{ retries }> attempts to create snapshot <#{ qtmp }> - retrying..." }
    end
    loopno += 1
  end

  unless qss
    debug{ "locking <#{ @path }> as last resort" }
    @qdb.write_lock do
      if((ss = take_snapshot.call))
        debug{ "snapshot <#{ qtmp }> created" }
        qss = ss
      else
        raise "failed <#{ loopno }> times to create snapshot <#{ qtmp }>"
      end
    end
  end

  qss
#--}}}
end

#standard_err_4(jid) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 101

def standard_err_4 jid
#--{{{
  File::expand_path(File::join(path, stderr4(jid)))
#--}}}
end

#standard_in_4(jid) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 81

def standard_in_4 jid
#--{{{
  File::expand_path(File::join(path, stdin4(jid)))
#--}}}
end

#standard_out_4(jid) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 91

def standard_out_4 jid
#--{{{
  File::expand_path(File::join(path, stdout4(jid)))
#--}}}
end

#status(options = {}) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 337

def status options = {}
#--{{{
  stats = OrderedAutoHash::new

  now = Time::now

  hms = lambda do |t|
    elapsed =
      begin
        Float t
      rescue
        now - Util::stamptime(t, 'local' => true)
      end
    sh, sm, ss = Util::hms elapsed.to_f
    s = "#{ '%2.2d' % sh }h#{ '%2.2d' % sm }m#{ '%05.2f' % ss }s" 
  end

  exit_code_map = 
    options[:exit_code_map] || options['exit_code_map'] || {}

  ro_transaction do
  #
  # jobs stats
  #
    total = 0
    %w( pending holding running finished dead ).each do |state|
      sql = <<-sql
        select count(*) from jobs 
          where 
            state='#{ state }'
      sql
      tuples = execute sql 
      tuple = tuples.first
      count = (tuple ? Integer(tuple.first || 0) : 0)
      stats['jobs'][state] = count
      total += count
    end
    stats['jobs']['total'] = total
  #
  # temporal stats 
  #
    metrics = OrderedAutoHash::new
    metrics['pending']  = 'submitted'
    metrics['holding']  = 'submitted'
    metrics['running']  = 'started'
    metrics['finished'] = 'elapsed'
    metrics['dead']     = 'elapsed'

    metrics.each do |state, metric|
      sql = 
        unless metric == 'elapsed'
          <<-sql
            select min(#{ metric }) as max, max(#{ metric }) as min 
              from jobs where state='#{ state }'
          sql
        else
          <<-sql
            select min(#{ metric }) as min, max(#{ metric }) as max 
              from jobs where state='#{ state }'
          sql
        end
      tuple = execute(sql).first
      next unless tuple

      %w( min max ).each do |time|
        oh = nil
        t = tuple[time]
        if t
          sql = <<-sql
            select jid from jobs where #{ metric }='#{ t }' and state='#{ state }'
          sql
          which = execute(sql).first
          jid = (which and which['jid']).to_i
          if jid
            oh = OrderedAutoHash::new
            oh[jid] = hms[t]
            oh.yaml_inline = true
          end
          stats['temporal'][state][time] = oh 
        end
      end
      #stats['temporal'][state] ||= nil
    end
    stats['temporal'] ||= nil
  #
  # generate performance stats
  #
    sql = <<-sql
      select avg(elapsed) from jobs 
        where 
          state='finished'
    sql
    tuples = execute sql 
    tuple = tuples.first
    avg = (tuple ? Float(tuple.first || 0) : 0)
    stats['performance']['avg_time_per_job'] = hms[avg] 

    list = []
    0.step(5){|i| list << (2 ** i)}
    list << 24
    list.sort!

    list = 1, 12, 24

    list.each do |n|
      ago = now - (n * 3600)
      ago = Util::timestamp ago
      sql = <<-sql
        select count(*) from jobs 
          where 
            state = 'finished' and 
            finished  > '#{ ago }'
      sql
      tuples = execute sql 
      tuple = tuples.first
      count = (tuple ? Integer(tuple.first || 0) : 0)
      #stats['performance']["n_jobs_in_last_#{ n }_hrs"] = count
      stats['performance']["n_jobs_in_last_hrs"][n] = count
    end

  #
  # generate exit_status stats
  #
    #stats['exit_status'] = {}
    sql = <<-sql
      select count(*) from jobs 
        where 
          state='finished' and 
          exit_status=0 
    sql
    tuples = execute sql 
    tuple = tuples.first
    successes = (tuple ? Integer(tuple.first || 0) : 0)
    stats['exit_status']['successes'] = successes

    sql = <<-sql
      select count(*) from jobs 
        where 
          (state='finished' and 
          exit_status!=0) or
          state='dead'
    sql
    tuples = execute sql 
    tuple = tuples.first
    failures = (tuple ? Integer(tuple.first || 0) : 0)
    stats['exit_status']['failures'] = failures

    exit_code_map.each do |which, codes|
      exit_status_clause = codes.map{|code| "exit_status=#{ code }"}.join(' or ')
      sql = <<-sql
        select count(*) from jobs 
          where 
            (state='finished' and (#{ exit_status_clause }))
      sql
      tuples = execute sql 
      tuple = tuples.first
      n = (tuple ? Integer(tuple.first || 0) : 0)
      stats['exit_status'][which] = n
    end
  end

  stats
#--}}}
end

#stderr4(jid) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 96

def stderr4 jid
#--{{{
  "stderr/#{ jid }"
#--}}}
end

#stdin4(jid) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 76

def stdin4 jid
#--{{{
  "stdin/#{ jid }"
#--}}}
end

#stdout4(jid) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 86

def stdout4 jid
#--{{{
  "stdout/#{ jid }"
#--}}}
end

#submit(*jobs, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 116

def submit(*jobs, &block)
#--{{{
  if jobs.size == 1 and jobs.first.is_a?(String)
    jobs = [ { "command" => jobs.to_s } ]
  end

  now = Util::timestamp Time::now
    
  transaction do
    sql = "select max(jid) from jobs"
    tuple = execute(sql).first
    jid = tuple.first || 0
    jid = Integer(jid) + 1

    jobs.each do |job|
      command = job['command']
      stdin = job['stdin']
      data = job['data']

      raise "no command for job <#{ job.inspect }>" unless command 

      tmp_stdin(stdin) do |ts|
        tuple = QDB::tuple

        tuple['command']     = command 
        tuple['priority']    = job['priority'] || 0
        tuple['tag']         = job['tag']
        tuple['runner']      = job['runner']
        tuple['restartable'] = job['restartable']
        tuple['state']       = 'pending'
        tuple['submitted']   = now
        tuple['submitter']   = Util::hostname
        tuple['stdin']       = stdin4 jid
        tuple['stdout']      = nil 
        tuple['stderr']      = nil 
        tuple['data']       = data4 jid

        values = QDB::q tuple

        sql = "insert into jobs values (#{ values.join ',' });\n"
        execute(sql){}

        FileUtils::rm_rf standard_in_4(jid)
        FileUtils::rm_rf standard_out_4(jid)
        FileUtils::rm_rf standard_err_4(jid)
        FileUtils::rm_rf data_4(jid)
        FileUtils::cp ts.path, standard_in_4(jid) if ts
        if data
          FileUtils::cp_r data, data_4(jid)
        else
          FileUtils::mkdir_p data_4(jid)
        end

        if block
          sql = "select * from jobs where jid = '#{ jid }'"
          execute(sql, &block)
        end
      end

      jid += 1
    end
  end
    
  self
#--}}}
end

#tmp_stdin(stdin = nil) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 240

def tmp_stdin stdin = nil
#--{{{
  #stdin = nil if stdin.to_s.empty?
  if stdin.to_s.empty?
    return(block_given? ? yield(nil) : nil) 
  end
  stdin = STDIN if stdin == '-'

  was_opened = false

  begin
    unless stdin.respond_to?('read') or stdin.nil?
      stdin = stdin.to_s
      # relative to queue
      if stdin =~ %r|^@?stdin/\d+$|
        stdin.gsub! %r|^@|, ''
        stdin = File::join(path, stdin)
      end
      stdin = File.expand_path stdin
      stdin = open stdin
      was_opened = true
    end

    tmp = Tempfile::new "#{ Process::pid }_#{ rand }"
    while((buf = stdin.read(8192))); tmp.write buf; end if stdin
    tmp.close

    if block_given?
      begin
        yield tmp
      ensure
        tmp.close!
      end
    else
      return tmp
    end
  ensure
    stdin.close if was_opened rescue nil
  end
#--}}}
end

#transaction(*args) ⇒ Object 



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# File 'lib/rq/jobqueue.rb', line 791

def transaction(*args)
#--{{{
  raise "cannot upgrade ro_transaction" if @in_ro_transaction
  ret = nil
  if @in_transaction
    ret = yield
  else
    begin
      @in_transaction = true
      @qdb.transaction(*args){ ret = yield }
    ensure
      @in_transaction = false 
    end
  end
  ret
#--}}}
end

#update(kvs, *jids, &block) ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 613

def update(kvs, *jids, &block)
#--{{{
  ret = nil
#
# yank out stdin - which we allow as a key
#
  stdin = kvs.delete 'stdin'
  data = kvs.delete 'data'
#
# validate/munge state value iff present
#
  if((state = kvs['state']))
    case state
      when %r/^p/io
        kvs['state'] = 'pending'
      when %r/^h/io
        kvs['state'] = 'holding'
      else
        raise "update of <state> = <#{ state }> not allowed (try pending or holding)"
    end
  end
#
# validate kvs pairs
#
  allowed = %w( priority command tag runner restartable )
  kvs.each do |key, val|
    raise "update of <#{ key }> = <#{ val }> not allowed" unless
      (allowed.include?(key)) or (key == 'state' and %w( pending holding ).include?(val))
  end
#
# ensure there are acutally some jobs to update
#
  raise "no jobs to update" if jids.empty?
#
# generates sql to update jids with kvs and sql to show updated tuples
#
  build_sql = 
    lambda do |kvs, jids|
      if(jids.delete('pending'))
        execute("select jid from jobs where state='pending'") do |tuple| 
          jids << tuple['jid']
        end
      end

      if(jids.delete('holding'))
        execute("select jid from jobs where state='holding'") do |tuple| 
          jids << tuple['jid']
        end
      end

      rollback_transaction "no jobs to update" if jids.empty?

      update_clause = kvs.map{|k,v| v ? "#{ k }='#{ v }'" : "#{ k }=NULL" }.join(",\n")
      where_clause = jids.map{|jid| "jid=#{ jid }"}.join(" or\n")
      update_sql = 
        "update jobs\n" <<
        "set\n#{ update_clause }\n" <<
        "where\n(state='pending' or state='holding') and\n(#{ where_clause })"
      select_sql = "select * from jobs where (state='pending' or state='holding') and\n(#{ where_clause })"

      if kvs.empty?
        [ nil, select_sql ]
      else
        [ update_sql, select_sql ]
      end
    end
  #
  # setup stdin
  #
  tmp_stdin(stdin) do |ts|
    clobber_stdin = lambda do |job|
      FileUtils::cp ts.path, standard_in_4(job['jid']) if ts
      true
    end

    clobber_data = lambda do |job|
      if data
        FileUtils::rm_rf data_4(job['jid'])
        FileUtils::cp_r data, data_4(job['jid'])
      end
      true
    end

    tuples = []

    metablock = 
      if block
        lambda{|job| clobber_stdin[job] and clobber_data[job] and block[job]}
      else
        lambda{|job| clobber_stdin[job] and clobber_data[job] and tuples << job}
      end

    transaction do 
      update_sql, select_sql = build_sql[kvs, jids]
      break unless select_sql
      execute(update_sql){} if update_sql
      execute(select_sql, &metablock)
    end

    block ? nil : tuples
  end
#--}}}
end

#vacuum ⇒ Object

–}}}



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# File 'lib/rq/jobqueue.rb', line 608

def vacuum
#--{{{
  @qdb.vacuum
#--}}}
end