1 files changed, 57 insertions, 0 deletions
diff --git a/vendor/github.com/coreos/go-systemd/dbus/subscription_set.go b/vendor/github.com/coreos/go-systemd/dbus/subscription_set.go
new file mode 100644
index 000000000..5b408d584
--- /dev/null
+++ b/vendor/github.com/coreos/go-systemd/dbus/subscription_set.go
@@ -0,0 +1,57 @@
+// Copyright 2015 CoreOS, 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 dbus
+
+import (
+	"time"
+)
+
+// SubscriptionSet returns a subscription set which is like conn.Subscribe but
+// can filter to only return events for a set of units.
+type SubscriptionSet struct {
+	*set
+	conn *Conn
+}
+
+func (s *SubscriptionSet) filter(unit string) bool {
+	return !s.Contains(unit)
+}
+
+// Subscribe starts listening for dbus events for all of the units in the set.
+// Returns channels identical to conn.SubscribeUnits.
+func (s *SubscriptionSet) Subscribe() (<-chan map[string]*UnitStatus, <-chan error) {
+	// TODO: Make fully evented by using systemd 209 with properties changed values
+	return s.conn.SubscribeUnitsCustom(time.Second, 0,
+		mismatchUnitStatus,
+		func(unit string) bool { return s.filter(unit) },
+	)
+}
+
+// NewSubscriptionSet returns a new subscription set.
+func (conn *Conn) NewSubscriptionSet() *SubscriptionSet {
+	return &SubscriptionSet{newSet(), conn}
+}
+
+// mismatchUnitStatus returns true if the provided UnitStatus objects
+// are not equivalent. false is returned if the objects are equivalent.
+// Only the Name, Description and state-related fields are used in
+// the comparison.
+func mismatchUnitStatus(u1, u2 *UnitStatus) bool {
+	return u1.Name != u2.Name ||
+		u1.Description != u2.Description ||
+		u1.LoadState != u2.LoadState ||
+		u1.ActiveState != u2.ActiveState ||
+		u1.SubState != u2.SubState
+}