github.com/mmatczuk/gohan@v0.0.0-20170206152520-30e45d9bdb69/extension/gohanscript/lib/job.go (about)

     1  // Copyright (C) 2016  Juniper Networks, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
    12  // implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  
    16  package lib
    17  
    18  import (
    19  	"github.com/cloudwan/gohan/extension/gohanscript"
    20  	"github.com/cloudwan/gohan/job"
    21  )
    22  
    23  func init() {
    24  	gohanscript.RegisterStmtParser("job", backgroundJob)
    25  }
    26  
    27  func backgroundJob(stmt *gohanscript.Stmt) (func(*gohanscript.Context) (interface{}, error), error) {
    28  	stmts, err := gohanscript.MakeStmts(stmt.File, stmt.RawNode["job"])
    29  	if err != nil {
    30  		return nil, stmt.Errorf("background code error: %s", err)
    31  	}
    32  	queueArg, err := gohanscript.NewValue(stmt.RawData["queue"])
    33  	if err != nil {
    34  		return nil, stmt.Errorf("background code error: %s", err)
    35  	}
    36  	f, err := gohanscript.StmtsToFunc("job", stmts)
    37  	if err != nil {
    38  		return nil, err
    39  	}
    40  	return func(context *gohanscript.Context) (interface{}, error) {
    41  		queue := queueArg.Value(context).(*job.Queue)
    42  		newContext := context.Extend(map[string]interface{}{})
    43  		queue.Add(
    44  			job.NewJob(func() {
    45  				f(newContext)
    46  				newContext.VM.Stop()
    47  			}))
    48  		return nil, nil
    49  	}, nil
    50  }
    51  
    52  //MakeQueue makes new worker queue with specfied workers
    53  func MakeQueue(workers int) *job.Queue {
    54  	return job.NewQueue(uint(workers))
    55  }
    56  
    57  //WaitQueue waits queue get empty
    58  func WaitQueue(queue *job.Queue) {
    59  	queue.Wait()
    60  }
    61  
    62  //Stop stops work queue
    63  func Stop(queue *job.Queue) {
    64  	queue.Stop()
    65  }
    66  
    67  //ForceStop force stop queue
    68  func ForceStop(queue *job.Queue) {
    69  	queue.ForceStop()
    70  }