1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ANDROID_OS_HW_REMOTE_BINDER_H
18 #define ANDROID_OS_HW_REMOTE_BINDER_H
19 
20 #include <android-base/macros.h>
21 #include <hwbinder/Binder.h>
22 #include <jni.h>
23 #include <utils/Mutex.h>
24 #include <utils/RefBase.h>
25 #include <vector>
26 
27 namespace android {
28 
29 // Per-IBinder death recipient bookkeeping.  This is how we reconcile local jobject
30 // death recipient references passed in through JNI with the permanent corresponding
31 // HwBinderDeathRecipient objects.
32 
33 class HwBinderDeathRecipient;
34 
35 class HwBinderDeathRecipientList : public RefBase {
36     std::vector<sp<HwBinderDeathRecipient>> mList;
37     Mutex mLock;
38 
39 public:
40     HwBinderDeathRecipientList();
41     ~HwBinderDeathRecipientList();
42 
43     void add(const sp<HwBinderDeathRecipient>& recipient);
44     void remove(const sp<HwBinderDeathRecipient>& recipient);
45 
46     // finds the most recently added matching death recipient
47     sp<HwBinderDeathRecipient> find(jobject recipient);
48 
49     Mutex& lock();  // Use with care; specifically for mutual exclusion during binder death
50 };
51 
52 struct JHwRemoteBinder : public RefBase {
53     static void InitClass(JNIEnv *env);
54 
55     static sp<JHwRemoteBinder> SetNativeContext(
56             JNIEnv *env, jobject thiz, const sp<JHwRemoteBinder> &context);
57 
58     static sp<JHwRemoteBinder> GetNativeContext(JNIEnv *env, jobject thiz);
59 
60     static jobject NewObject(JNIEnv *env, const sp<hardware::IBinder> &binder);
61 
62     JHwRemoteBinder(
63             JNIEnv *env, jobject thiz, const sp<hardware::IBinder> &binder);
64 
65     sp<hardware::IBinder> getBinder() const;
66     void setBinder(const sp<hardware::IBinder> &binder);
67     sp<HwBinderDeathRecipientList> getDeathRecipientList() const;
68 
69 protected:
70     virtual ~JHwRemoteBinder();
71 
72 private:
73     jobject mObject;
74 
75     sp<hardware::IBinder> mBinder;
76     sp<HwBinderDeathRecipientList> mDeathRecipientList;
77     DISALLOW_COPY_AND_ASSIGN(JHwRemoteBinder);
78 };
79 
80 int register_android_os_HwRemoteBinder(JNIEnv *env);
81 
82 }  // namespace android
83 
84 #endif  // ANDROID_OS_HW_REMOTE_BINDER_H
85 
86