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authorshuai chen <chenshuai@huawei.com>2016-07-07 03:45:29 +0000
committerGerrit Code Review <gerrit@172.30.200.206>2016-07-07 03:45:29 +0000
commit86a45414358a9e6f36467621e5f0c24437433896 (patch)
tree9c95d901ee6c91b57287218c06d73516021cb5dd /deploy/conf/vm_environment/huawei-virtual4/network_onos.yml
parentff20b4011edfe706bcc605ca30d1f618a889a027 (diff)
parent0f53761bed746e2217e4d088d80b6cc5ddd75fd7 (diff)
Merge "make_pip_repo auto download package dependency"
Diffstat (limited to 'deploy/conf/vm_environment/huawei-virtual4/network_onos.yml')
0 files changed, 0 insertions, 0 deletions
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/*
Copyright 2013 Google Inc.

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.
*/

// Package singleflight provides a duplicate function call suppression
// mechanism.
package singleflight

import "sync"

// call is an in-flight or completed Do call
type call struct {
	wg  sync.WaitGroup
	val interface{}
	err error
}

// Group represents a class of work and forms a namespace in which
// units of work can be executed with duplicate suppression.
type Group struct {
	mu sync.Mutex       // protects m
	m  map[string]*call // lazily initialized
}

// Do executes and returns the results of the given function, making
// sure that only one execution is in-flight for a given key at a
// time. If a duplicate comes in, the duplicate caller waits for the
// original to complete and receives the same results.
func (g *Group) Do(key string, fn func() (interface{}, error)) (interface{}, error) {
	g.mu.Lock()
	if g.m == nil {
		g.m = make(map[string]*call)
	}
	if c, ok := g.m[key]; ok {
		g.mu.Unlock()
		c.wg.Wait()
		return c.val, c.err
	}
	c := new(call)
	c.wg.Add(1)
	g.m[key] = c
	g.mu.Unlock()

	c.val, c.err = fn()
	c.wg.Done()

	g.mu.Lock()
	delete(g.m, key)
	g.mu.Unlock()

	return c.val, c.err
}