pkg/core/resources/manager/customizable_manager.go

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 manager

import (
	"context"
)

import (
	"github.com/apache/dubbo-kubernetes/pkg/core/resources/model"
	"github.com/apache/dubbo-kubernetes/pkg/core/resources/store"
)

type ResourceManagerWrapper = func(delegate ResourceManager) ResourceManager

type CustomizableResourceManager interface {
	ResourceManager
	Customize(model.ResourceType, ResourceManager)
	ResourceManager(model.ResourceType) ResourceManager
	WrapAll(ResourceManagerWrapper)
}

func NewCustomizableResourceManager(defaultManager ResourceManager, customManagers map[model.ResourceType]ResourceManager) CustomizableResourceManager {
	if customManagers == nil {
		customManagers = map[model.ResourceType]ResourceManager{}
	}
	return &customizableResourceManager{
		defaultManager: defaultManager,
		customManagers: customManagers,
	}
}

var _ CustomizableResourceManager = &customizableResourceManager{}

type customizableResourceManager struct {
	defaultManager ResourceManager
	customManagers map[model.ResourceType]ResourceManager
}

// Customize installs a new manager for the given type, overwriting any
// existing manager for that type.
func (m *customizableResourceManager) Customize(resourceType model.ResourceType, manager ResourceManager) {
	m.customManagers[resourceType] = manager
}

func (m *customizableResourceManager) Get(ctx context.Context, resource model.Resource, fs ...store.GetOptionsFunc) error {
	return m.ResourceManager(resource.Descriptor().Name).Get(ctx, resource, fs...)
}

func (m *customizableResourceManager) List(ctx context.Context, list model.ResourceList, fs ...store.ListOptionsFunc) error {
	return m.ResourceManager(list.GetItemType()).List(ctx, list, fs...)
}

func (m *customizableResourceManager) Create(ctx context.Context, resource model.Resource, fs ...store.CreateOptionsFunc) error {
	return m.ResourceManager(resource.Descriptor().Name).Create(ctx, resource, fs...)
}

func (m *customizableResourceManager) Delete(ctx context.Context, resource model.Resource, fs ...store.DeleteOptionsFunc) error {
	return m.ResourceManager(resource.Descriptor().Name).Delete(ctx, resource, fs...)
}

func (m *customizableResourceManager) DeleteAll(ctx context.Context, list model.ResourceList, fs ...store.DeleteAllOptionsFunc) error {
	return m.ResourceManager(list.GetItemType()).DeleteAll(ctx, list, fs...)
}

func (m *customizableResourceManager) Update(ctx context.Context, resource model.Resource, fs ...store.UpdateOptionsFunc) error {
	return m.ResourceManager(resource.Descriptor().Name).Update(ctx, resource, fs...)
}

func (m *customizableResourceManager) ResourceManager(typ model.ResourceType) ResourceManager {
	if customManager, ok := m.customManagers[typ]; ok {
		return customManager
	}
	return m.defaultManager
}

func (m *customizableResourceManager) WrapAll(wrapper ResourceManagerWrapper) {
	m.defaultManager = wrapper(m.defaultManager)
	for key, manager := range m.customManagers {
		m.customManagers[key] = wrapper(manager)
	}
}