| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| package tests.io; |
| |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.util.ArrayDeque; |
| import java.util.Deque; |
| import java.util.HashMap; |
| import java.util.Map; |
| import libcore.io.ErrnoException; |
| import libcore.io.Libcore; |
| import libcore.io.Os; |
| import libcore.io.OsConstants; |
| |
| /** |
| * A mocking interceptor that wraps another {@link Os} to add faults. This can |
| * be useful to test otherwise hard-to-test scenarios such as a full disk. |
| */ |
| public final class MockOs { |
| private final InheritableThreadLocal<Map<String, Deque<InvocationHandler>>> handlers |
| = new InheritableThreadLocal<Map<String, Deque<InvocationHandler>>>() { |
| @Override protected Map<String, Deque<InvocationHandler>> initialValue() { |
| return new HashMap<String, Deque<InvocationHandler>>(); |
| } |
| }; |
| |
| private Os delegate; |
| private final InvocationHandler delegateHandler = new InvocationHandler() { |
| @Override public Object invoke(Object o, Method method, Object[] args) throws Throwable { |
| try { |
| return method.invoke(delegate, args); |
| } catch (InvocationTargetException e) { |
| throw e.getCause(); |
| } |
| } |
| }; |
| |
| private final InvocationHandler invocationHandler = new InvocationHandler() { |
| @Override public Object invoke(Object proxy, Method method, Object[] args) |
| throws Throwable { |
| InvocationHandler handler = getHandlers(method.getName()).poll(); |
| if (handler == null) { |
| handler = delegateHandler; |
| } |
| return handler.invoke(proxy, method, args); |
| } |
| }; |
| |
| private final Os mockOs = (Os) Proxy.newProxyInstance(MockOs.class.getClassLoader(), |
| new Class[] { Os.class }, invocationHandler); |
| |
| public void install() { |
| if (delegate != null) { |
| throw new IllegalStateException("MockOs already installed!"); |
| } |
| delegate = Libcore.os; |
| Libcore.os = mockOs; |
| } |
| |
| public void uninstall() { |
| if (delegate == null) { |
| throw new IllegalStateException("MockOs not installed!"); |
| } |
| Libcore.os = delegate; |
| } |
| |
| /** |
| * Returns the invocation handlers to handle upcoming invocations of |
| * {@code methodName}. If empty, calls will be handled by the delegate. |
| */ |
| public Deque<InvocationHandler> getHandlers(String methodName) { |
| Map<String, Deque<InvocationHandler>> threadFaults = handlers.get(); |
| Deque<InvocationHandler> result = threadFaults.get(methodName); |
| if (result == null) { |
| result = new ArrayDeque<InvocationHandler>(); |
| threadFaults.put(methodName, result); |
| } |
| return result; |
| } |
| |
| /** |
| * Enqueues the specified number of normal operations. Useful to delay |
| * faults. |
| */ |
| public void enqueueNormal(String methodName, int count) { |
| Deque<InvocationHandler> handlers = getHandlers(methodName); |
| for (int i = 0; i < count; i++) { |
| handlers.add(delegateHandler); |
| } |
| } |
| |
| public void enqueueFault(String methodName) { |
| enqueueFault(methodName, OsConstants.EIO); |
| } |
| |
| public void enqueueFault(String methodName, final int errno) { |
| getHandlers(methodName).add(new InvocationHandler() { |
| @Override public Object invoke(Object proxy, Method method, Object[] args) throws ErrnoException { |
| throw new ErrnoException(method.getName(), errno); |
| } |
| }); |
| } |
| } |