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 package libcore.util; 18 19 import com.android.layoutlib.bridge.impl.DelegateManager; 20 import 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24 * 25 * Through the layoutlib_create tool, the original native methods of NativeAllocationRegistry have 26 * been replaced by calls to methods of the same name in this delegate class. 27 * 28 * This class behaves like the original native implementation, but in Java, keeping previously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 */ 34 public 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
