1 /* 2 * Copyright 2014 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 dalvik.system; 18 19 import java.lang.reflect.Method; 20 21 public class BlockGuard { 22 private static Method m_getThreadPolicy; 23 private static Method m_onNetwork; 24 static { 25 try { 26 ClassLoader cl = ClassLoader.getSystemClassLoader(); 27 Class<?> c_closeGuard = cl.loadClass("dalvik.system.BlockGuard"); 28 29 m_getThreadPolicy = c_closeGuard.getDeclaredMethod("getThreadPolicy"); 30 m_getThreadPolicy.setAccessible(true); 31 32 Class<?> c_policy = cl.loadClass("dalvik.system.BlockGuard.Policy"); 33 34 m_onNetwork = c_policy.getDeclaredMethod("onNetwork"); 35 m_onNetwork.setAccessible(true); 36 } catch (Exception ignored) { 37 } 38 } 39 40 private BlockGuard() { 41 } 42 43 public static Policy getThreadPolicy() { 44 if (m_getThreadPolicy != null) { 45 try { 46 Object wrappedPolicy = m_getThreadPolicy.invoke(null); 47 return new PolicyWrapper(wrappedPolicy); 48 } catch (Exception ignored) { 49 } 50 } 51 return new PolicyWrapper(null); 52 } 53 54 public interface Policy { 55 void onNetwork(); 56 } 57 58 public static class PolicyWrapper implements Policy { 59 private final Object wrappedPolicy; 60 61 private PolicyWrapper(Object wrappedPolicy) { 62 this.wrappedPolicy = wrappedPolicy; 63 } 64 65 public void onNetwork() { 66 if (m_onNetwork != null && wrappedPolicy != null) { 67 try { 68 m_onNetwork.invoke(wrappedPolicy); 69 } catch (Exception ignored) { 70 } 71 } 72 } 73 } 74 } 75
