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
17package libcore.util;
18
19import com.android.layoutlib.bridge.impl.DelegateManager;
20import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
21
22/**
23 * Delegate implementing the native methods of {@link NativeAllocationRegistry}
24 *
25 * Through the layoutlib_create tool, the original native methods of NativeAllocationRegistry have
26 * been replaced by calls to methods of the same name in this delegate class.
27 *
28 * This class behaves like the original native implementation, but in Java, keeping previously
29 * native data into its own objects and mapping them to int that are sent back and forth between
30 * it and the original NativeAllocationRegistry class.
31 *
32 * @see DelegateManager
33 */
34public class NativeAllocationRegistry_Delegate {
35
36    // ---- delegate manager ----
37    private static final DelegateManager<NativeAllocationRegistry_Delegate> sManager =
38            new DelegateManager<>(NativeAllocationRegistry_Delegate.class);
39
40    private final FreeFunction mFinalizer;
41
42    private NativeAllocationRegistry_Delegate(FreeFunction finalizer) {
43        mFinalizer = finalizer;
44    }
45
46    /**
47     * The result of this method should be cached by the class and reused.
48     */
49    public static long createFinalizer(FreeFunction finalizer) {
50        return sManager.addNewDelegate(new NativeAllocationRegistry_Delegate(finalizer));
51    }
52
53    @LayoutlibDelegate
54    /*package*/ static void applyFreeFunction(long freeFunction, long nativePtr) {
55        // This method MIGHT run in the context of the finalizer thread. If the delegate method
56        // crashes, it could bring down the VM. That's why we catch all the exceptions and ignore
57        // them.
58        try {
59            NativeAllocationRegistry_Delegate delegate = sManager.getDelegate(freeFunction);
60            if (delegate != null) {
61                delegate.mFinalizer.free(nativePtr);
62            }
63        } catch (Throwable ignore) {
64        }
65    }
66
67    public interface FreeFunction {
68        void free(long nativePtr);
69    }
70}
71