mirror of
https://github.com/xiaoqidun/ofdgo.git
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72 lines
2.5 KiB
Go
72 lines
2.5 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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import (
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"fmt"
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"sync"
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)
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// backendRegistry 保存后端工厂，不共享有状态的后端实例
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var backendRegistry = struct {
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sync.RWMutex
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factories map[string]func() RenderBackends
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}{factories: make(map[string]func() RenderBackends)}
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// RegisterRenderBackend 注册后端组合，工厂应返回独立实例，重复标识不会覆盖已有实现
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// 入参: name 后端标识, factory 后端工厂
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// 返回: error 无效或重复注册错误
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func RegisterRenderBackend(name string, factory func() RenderBackends) error {
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if name == "" || factory == nil {
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return fmt.Errorf("backend name and factory are required")
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}
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backendRegistry.Lock()
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defer backendRegistry.Unlock()
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if _, exists := backendRegistry.factories[name]; exists {
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return fmt.Errorf("render backend %q already registered", name)
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}
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backendRegistry.factories[name] = factory
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return nil
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}
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// NewRenderBackends 创建已注册后端组合，各项能力通过Info报告实际提供者
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// 入参: name 已注册后端标识
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// 返回: RenderBackends 后端组合, error 未知后端错误
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func NewRenderBackends(name string) (RenderBackends, error) {
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backendRegistry.RLock()
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factory := backendRegistry.factories[name]
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backendRegistry.RUnlock()
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if factory == nil {
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return RenderBackends{}, fmt.Errorf("unknown render backend %q", name)
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}
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return factory(), nil
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}
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// RenderBackendInfos 列出已注册组合及其实际能力，供原生程序和WASM共用
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// 返回: map[string]BackendInfo 后端能力
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func RenderBackendInfos() map[string]BackendInfo {
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backendRegistry.RLock()
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factories := make(map[string]func() RenderBackends, len(backendRegistry.factories))
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for name, factory := range backendRegistry.factories {
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factories[name] = factory
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}
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backendRegistry.RUnlock()
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result := make(map[string]BackendInfo, len(factories))
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for name, factory := range factories {
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result[name] = factory().Info()
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}
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return result
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}
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