Initial QSfera import

Server/vendor/github.com/libregraph/lico/managers/managers.go

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2017-2019 Kopano and its licensors
+ *
+ * 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 managers
+
+import (
+	"fmt"
+)
+
+// ServiceUsesManagers is an interface for service which register to managers.
+type ServiceUsesManagers interface {
+	RegisterManagers(mgrs *Managers) error
+}
+
+// Managers is a registry for named managers.
+type Managers struct {
+	registry map[string]interface{}
+}
+
+// New creates a new Managers.
+func New() *Managers {
+	return &Managers{
+		registry: make(map[string]interface{}),
+	}
+}
+
+// Set adds the provided manager with the provided name to the accociated
+// Managers.
+func (m *Managers) Set(name string, manager interface{}) {
+	m.registry[name] = manager
+}
+
+// Get returns the manager identified by the given name from the accociated
+// managers.
+func (m *Managers) Get(name string) (interface{}, bool) {
+	manager, ok := m.registry[name]
+
+	return manager, ok
+}
+
+// Must returns the manager indentified by the given name or panics.
+func (m *Managers) Must(name string) interface{} {
+	manager, ok := m.Get(name)
+	if !ok {
+		panic(fmt.Errorf("manager %s not found", name))
+	}
+
+	return manager
+}
+
+// Apply registers the accociated manager's registered managers.
+func (m *Managers) Apply() error {
+	for _, manager := range m.registry {
+		if service, ok := manager.(ServiceUsesManagers); ok {
+			err := service.RegisterManagers(m)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}