jni_utils.hpp
1.7 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
/*
* Copyright 2018 Realm Inc.
*
* 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 REALM_JNI_UTIL_JNI_UTILS_HPP
#define REALM_JNI_UTIL_JNI_UTILS_HPP
#include <jni.h>
#include <vector>
namespace realm {
namespace jni_util {
// Util functions for JNI.
class JniUtils {
public:
~JniUtils()
{
}
// Call this only once in JNI_OnLoad.
static void initialize(JavaVM* vm, jint vm_version) noexcept;
// Call this in JNI_OnUnload.
static void release();
// When attach_if_needed is false, returns the JNIEnv if there is one attached to this thread. Assert if there is
// none. When attach_if_needed is true, try to attach and return a JNIEnv if necessary.
static JNIEnv* get_env(bool attach_if_needed = false);
// Detach the current thread from the JVM. Only required for C++ threads that where attached in the first place.
// Failing to do so is a resource leak.
static void detach_current_thread();
private:
JniUtils(JavaVM* vm, jint vm_version) noexcept
: m_vm(vm)
, m_vm_version(vm_version)
{
}
JavaVM* m_vm;
jint m_vm_version;
};
} // namespace realm
} // namespace jni_util
#endif // REALM_JNI_UTIL_JNI_UTILS_HPP