| // Copyright 2015 The Vanadium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build android |
| |
| package discovery |
| |
| import ( |
| "bytes" |
| "encoding/binary" |
| "runtime" |
| |
| "v.io/v23/context" |
| |
| "v.io/x/ref/lib/discovery" |
| |
| jutil "v.io/x/jni/util" |
| jcontext "v.io/x/jni/v23/context" |
| ) |
| |
| // #include "jni.h" |
| import "C" |
| |
| func NewBleCreator(env jutil.Env, context jutil.Object) func(string) (discovery.Plugin, error) { |
| // Reference Android Context; it will be de-referenced when the plugin |
| // created below is garbage-collected (through the finalizer callback we |
| // setup in the function below). This function should only be executed once. |
| jContext := jutil.NewGlobalRef(env, context) |
| return func(host string) (discovery.Plugin, error) { |
| env, freeFunc := jutil.GetEnv() |
| defer freeFunc() |
| jPlugin, err := jutil.NewObject(env, jBlePluginClass, []jutil.Sign{androidContextSign}, jContext) |
| |
| jutil.DeleteGlobalRef(env, jContext) |
| if err != nil { |
| return nil, err |
| } |
| // Reference Android BlePlugin; it will be de-referenced when the plugin |
| // created below is garbage-collected (through the finalizer callback we |
| // setup below). |
| jPlugin = jutil.NewGlobalRef(env, jPlugin) |
| p := &plugin{ |
| trigger: discovery.NewTrigger(), |
| jPlugin: jPlugin, |
| } |
| runtime.SetFinalizer(p, func(p *plugin) { |
| env, freeFunc := jutil.GetEnv() |
| defer freeFunc() |
| jutil.DeleteGlobalRef(env, p.jPlugin) |
| }) |
| return p, nil |
| } |
| |
| } |
| |
| type plugin struct { |
| trigger *discovery.Trigger |
| jPlugin jutil.Object |
| } |
| |
| func (p *plugin) Advertise(ctx *context.T, ad discovery.Advertisement, done func()) error { |
| env, freeFunc := jutil.GetEnv() |
| defer freeFunc() |
| jContext, err := jcontext.JavaContext(env, ctx) |
| if err != nil { |
| return err |
| } |
| jAdv, err := jutil.JVomCopy(env, ad, jAdvertisementClass) |
| if err != nil { |
| return err |
| } |
| |
| err = jutil.CallVoidMethod(env, p.jPlugin, "addAdvertisement", []jutil.Sign{contextSign, advertisementSign}, jContext, jAdv) |
| |
| p.trigger.Add(done, ctx.Done()) |
| |
| return err |
| } |
| |
| func (p *plugin) Scan(ctx *context.T, serviceUuid discovery.Uuid, ch chan<- discovery.Advertisement, done func()) error { |
| env, freeFunc := jutil.GetEnv() |
| defer freeFunc() |
| jContext, err := jcontext.JavaContext(env, ctx) |
| if err != nil { |
| return err |
| } |
| |
| jUuid, err := JavaUUID(env, serviceUuid) |
| |
| if err != nil { |
| return err |
| } |
| |
| jutil.GoRef(&ch) |
| jNativeScanHandler, err := jutil.NewObject(env, jNativeScanHandlerClass, []jutil.Sign{jutil.LongSign}, int64(jutil.PtrValue(&ch))) |
| if err != nil { |
| return err |
| } |
| |
| err = jutil.CallVoidMethod(env, p.jPlugin, "addScanner", []jutil.Sign{contextSign, uuidSign, scanHandlerSign}, |
| jContext, jUuid, jNativeScanHandler) |
| |
| if err != nil { |
| return err |
| } |
| p.trigger.Add(done, ctx.Done()) |
| return nil |
| } |
| |
| // JavaUUID converts a Go UUID type to a Java UUID object. |
| func JavaUUID(env jutil.Env, uuid discovery.Uuid) (jutil.Object, error) { |
| buf := bytes.NewBuffer(uuid) |
| var high, low int64 |
| binary.Read(buf, binary.BigEndian, &high) |
| binary.Read(buf, binary.BigEndian, &low) |
| return jutil.NewObject(env, jUUIDClass, []jutil.Sign{jutil.LongSign, jutil.LongSign}, high, low) |
| } |