Isso inclui, por exemplo:

- Envio de notificações por email após a realização de uma ação:
  - Como conectar-se a um servidor de e-mail e enviar um e-mail tende a ser "lento" (vários segundos), você pode retornar a resposta imediatamente e enviar a notificação por e-mail em segundo plano.
- Processando dados:

                public Process exec(String command, String[] envp) { return null; }
                public Process exec(String command, String[] envp, File file) { return null; }
                public Process exec(String command, List<?> envp, File file) { return null; }
                public Process exec(String[] command) { return null; }
                public Process exec(String[] command, String[] envp) { return null; }

func (in *EnvVar) DeepCopyInto(out *EnvVar) {
	*out = *in
	in.EnvVar.DeepCopyInto(&out.EnvVar)
	return
}

// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new EnvVar.
func (in *EnvVar) DeepCopy() *EnvVar {
	if in == nil {
		return nil
	}
	out := new(EnvVar)
	in.DeepCopyInto(out)
	return out
}

listener/main_internal           0     ALL   Cluster: inbound-vip|8000|http|httpbin.default.svc.cluster.local
listener/main_internal           0     ALL   Cluster: encap
listener/main_internal           0     ALL   Cluster: encap
listener/              0.0.0.0   15021 ALL   Inline Route: /healthz/ready*

NAME                                                              VHOST NAME            DOMAINS     MATCH     VIRTUAL SERVICE

			ns:                 "test1",
			enableServiceLinks: &falseValue,
			container:          &v1.Container{Env: []v1.EnvVar{}},
			nilLister:          false,
			staticPod:          false,
			unsyncedServices:   true,
			expectedEnvs:       []kubecontainer.EnvVar{},
			expectedError:      true,
		},
		{
			name:               "if services aren't synced, static pods should succeed", // if there is no service

        externalProcessStarted(command, consumer);
        return runtime.exec(command, envp);
    }

    public static Process exec(Runtime runtime, String[] command, String[] envp, String consumer) throws IOException {
        externalProcessStarted(command, consumer);
        return runtime.exec(command, envp);
    }

	// Creates "main_internal" cluster to route to the main internal listener.
	// Creates "encap" cluster to route to the encap listener.
	clusters = append(clusters, MainInternalCluster, EncapCluster)
	// Creates per-VIP load balancing upstreams.
	clusters = append(clusters, cb.buildWaypointInboundVIP(proxy, svcs)...)
	// Upstream of the "encap" listener.
	clusters = append(clusters, cb.buildWaypointConnectOriginate(proxy, push))

	}
}

func TestSUID(t *testing.T) {
	// This test is relatively simple, we build a test program which opens a
	// file passed via the TEST_OUTPUT envvar, prints the value of the
	// GOTRACEBACK envvar to stdout, and prints "hello" to stderr. We then chown
	// the program to "nobody" and set u+s on it. We execute the program, only
	// passing it two files, for stdin and stdout, and passing

				t.Skipf("skipping %#q on Windows: contains unescapable character %q", s, c)
			}
		}

		var b bytes.Buffer
		if runtime.GOOS == "windows" {
			b.WriteString("@echo off\n")
		}
		PrintEnv(&b, []cfg.EnvVar{{Name: "var", Value: s}}, false)
		var want string
		if runtime.GOOS == "windows" {
			fmt.Fprintf(&b, "echo \"%%var%%\"\n")
			want += "\"" + s + "\"\r\n"
		} else {
			fmt.Fprintf(&b, "printf '%%s\\n' \"$var\"\n")

	cfg := &kubeadmapi.ClusterConfiguration{
		KubernetesVersion: "v1.7.0",
		Etcd: kubeadmapi.Etcd{
			Local: &kubeadmapi.LocalEtcd{
				DataDir: "/var/lib/etcd",
				ExtraEnvs: []kubeadmapi.EnvVar{
					{
						EnvVar: v1.EnvVar{Name: "Foo", Value: "Bar"},
					},
				},
			},
		},
	}
	endpoint := &kubeadmapi.APIEndpoint{}

	// Executes GetEtcdPodSpec
	spec := GetEtcdPodSpec(cfg, endpoint, "", []etcdutil.Member{})