platform_build_soong/java/sysprop.go

// Copyright (C) 2019 The Android Open Source Project
//
// 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 java

// This file contains a map to redirect dependencies towards sysprop_library. If a sysprop_library
// is owned by Platform, and the client module links against system API, the public stub of the
// sysprop_library should be used. The map will contain public stub names of sysprop_libraries.

import (
	"sync"

	"android/soong/android"
)

type syspropLibraryInterface interface {
	BaseModuleName() string
	Owner() string
	HasPublicStub() bool
	JavaPublicStubName() string
}

var (
	syspropPublicStubsKey  = android.NewOnceKey("syspropPublicStubsJava")
	syspropPublicStubsLock sync.Mutex
)

func init() {
	android.PreDepsMutators(func(ctx android.RegisterMutatorsContext) {
		ctx.BottomUp("sysprop_java", SyspropMutator).Parallel()
	})
}

func syspropPublicStubs(config android.Config) map[string]string {
	return config.Once(syspropPublicStubsKey, func() interface{} {
		return make(map[string]string)
	}).(map[string]string)
}

// gather list of sysprop libraries owned by platform.
func SyspropMutator(mctx android.BottomUpMutatorContext) {
	if m, ok := mctx.Module().(syspropLibraryInterface); ok {
		if m.Owner() != "Platform" || !m.HasPublicStub() {
			return
		}

		syspropPublicStubs := syspropPublicStubs(mctx.Config())
		syspropPublicStubsLock.Lock()
		defer syspropPublicStubsLock.Unlock()

		syspropPublicStubs[m.BaseModuleName()] = m.JavaPublicStubName()
	}
}