All Downloads are FREE. Search and download functionalities are using the official Maven repository.

com.google.inject.internal.InterceptorStackCallback Maven / Gradle / Ivy

There is a newer version: 3.0.0-alpha-3
Show newest version
/*
 * Copyright (C) 2006 Google Inc.
 *
 * 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 com.google.inject.internal;

import static com.google.inject.internal.BytecodeGen.ENHANCER_BY_GUICE_MARKER;

import com.google.common.collect.Lists;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.List;
import java.util.function.BiFunction;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

/**
 * Intercepts a method with a stack of interceptors.
 *
 * 

Acts as a JDK {@link InvocationHandler} so the proxy using it can avoid Guice-specific types. * * @author [email protected] (Bob Lee) */ final class InterceptorStackCallback implements InvocationHandler { private static final String GUICE_INTERNAL_AOP_PACKAGE = "com.google.inject.internal.aop"; final Method method; final MethodInterceptor[] interceptors; final BiFunction superInvoker; public InterceptorStackCallback( Method method, List interceptors, BiFunction superInvoker) { this.method = method; this.interceptors = interceptors.toArray(new MethodInterceptor[interceptors.size()]); this.superInvoker = superInvoker; } @Override public Object invoke(Object proxy, Method unused, Object[] arguments) throws Throwable { return new InterceptedMethodInvocation(proxy, arguments, 0).proceed(); } private class InterceptedMethodInvocation implements MethodInvocation { final Object proxy; final Object[] arguments; final int interceptorIndex; public InterceptedMethodInvocation(Object proxy, Object[] arguments, int interceptorIndex) { this.proxy = proxy; this.arguments = arguments; this.interceptorIndex = interceptorIndex; } @Override public Object proceed() throws Throwable { try { return interceptorIndex == interceptors.length ? superInvoker.apply(proxy, arguments) : interceptors[interceptorIndex].invoke( new InterceptedMethodInvocation(proxy, arguments, interceptorIndex + 1)); } catch (Throwable t) { pruneStacktrace(t); throw t; } } @Override public Method getMethod() { return method; } @Override public Object[] getArguments() { return arguments; } @Override public Object getThis() { return proxy; } @Override public AccessibleObject getStaticPart() { return getMethod(); } } /** * Removes stacktrace elements related to AOP internal mechanics from the throwable's stack trace * and any causes it may have. */ private void pruneStacktrace(Throwable throwable) { for (Throwable t = throwable; t != null; t = t.getCause()) { StackTraceElement[] stackTrace = t.getStackTrace(); List pruned = Lists.newArrayList(); for (StackTraceElement element : stackTrace) { String className = element.getClassName(); if (!className.startsWith(InterceptorStackCallback.class.getName()) && !className.startsWith(GUICE_INTERNAL_AOP_PACKAGE) && !className.contains(ENHANCER_BY_GUICE_MARKER)) { pruned.add(element); } } t.setStackTrace(pruned.toArray(new StackTraceElement[pruned.size()])); } } }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy