jni_utils.h

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// Copyright 2021 gRPC authors.
//
// 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.
 
#ifndef GRPC_CORE_EXT_TRANSPORT_BINDER_CLIENT_JNI_UTILS_H
#define GRPC_CORE_EXT_TRANSPORT_BINDER_CLIENT_JNI_UTILS_H
 
#if defined(ANDROID) || defined(__ANDROID__)
 
#include <grpc/support/port_platform.h>
 
#include <jni.h>
 
#include <functional>
#include <string>
 
#include "absl/strings/string_view.h"
 
namespace grpc_binder {
 
// Finds NativeConnectionHelper Java class and caches it. This is useful because
// FindClass only works when there is a Java class in the call stack. Typically
// user might want to call this once in a place that is called from Java (ex.
// JNI_OnLoad) so subsequent BinderTransport code can find Java class
jclass FindNativeConnectionHelper(JNIEnv* env);
 
jclass FindNativeConnectionHelper(
    JNIEnv* env, std::function<void*(std::string)> class_finder);
 
// Calls Java method NativeConnectionHelper.tryEstablishConnection
void TryEstablishConnection(JNIEnv* env, jobject application,
                            absl::string_view pkg, absl::string_view cls,
                            absl::string_view action_name,
                            absl::string_view conn_id);
 
// Calls Java method NativeConnectionHelper.isSignatureMatch.
// Will also return false if failed to invoke Java.
bool IsSignatureMatch(JNIEnv* env, jobject context, int uid1, int uid2);
 
}  // namespace grpc_binder
 
#endif
 
#endif  // GRPC_CORE_EXT_TRANSPORT_BINDER_CLIENT_JNI_UTILS_H