libs/discovery/jni.go

// 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 (
	"fmt"
	"unsafe"

	jutil "v.io/x/jni/util"
	"v.io/x/ref/lib/discovery"
)
// #include "jni.h"
import "C"
var (
// Global reference for io.v.android.libs.discovery.ble.BlePlugin
	jBlePluginClass jutil.Class
	// Global reference for io.v.x.ref.lib.discovery.Advertisement
	jAdvertisementClass jutil.Class
	// Global reference for java.util.UUID
	jUUIdClass jutil.Class
	// Global reference for io.v.android.libs.discovery.ble.NativeScanHandler
	jNativeScanHandlerClass jutil.Class
)

func Init(env jutil.Env) error {
	var err error
	jUUIDClass, err = jutil.JFindClass(env, "java/util/UUID")
	if err != nil {
		return err
	}

	jNativeScanHandlerClass, err = jutil.JFindClass(env, "io/v/android/libs/discovery/ble/NativeScanHandler")
	if err != nil {
		return err
	}

	jBlePluginClass, err = jutil.JFindClass(env, "io/v/android/libs/discovery/ble/BlePlugin")
	if err != nil {
		return err
	}

	jAdvertisementClass, err = jutil.JFindClass(env, "io/v/x/ref/lib/discovery/Advertisement")
	return err
}

//export Java_io_android_libs_discovery_ble_NativeScanHandler_nativeHandleUpdate
func Java_io_android_libs_discovery_ble_NativeScanHandler_nativeHandleUpdate(jenv *C.JNIEnv, _ C.jobject, jAdv C.jobject, goPtr C.jlong)  {
	env := jutil.Env(uintptr(unsafe.Pointer(jenv)))
	c, ok := (*(*chan <- discovery.Advertisement)(jutil.NativePtr(goPtr)))

	if !ok {
		jutil.JThrow(env, fmt.Errorf("Internal error"))
		return
	}
	advObject := jutil.Object(uintptr(unsafe.Pointer(jAdv)))
	var adv discovery.Advertisement
	if err := jutil.GoVomCopy(env, advObject, jAdvertisementClass, &adv); err != nil {
		jutil.JThrow(env, err)
		return
	}
	ch <-advObject
}

//export Java_io_android_libs_discovery_ble_NativeScanHandler_nativeCleanup
func Java_io_android_libs_discovery_ble_NativeScanHandler_nativeCleanup(jenv *C.JNIEnv, _ C.jobject, goPtr c.jlong) {
	jutil.GoUnref(jutil.NativePtr(goPtr))
}